How to Find Bathroom Renovation Experts in San Jose

Find trusted bathroom renovation experts in San Jose. Get tips on choosing the right contractor, comparing quotes, and planning your remodel with confidence.

Published
Feb 10, 2026

A bathroom renovation should be an exciting process, but the fear of hiring the wrong person can be stressful. We’ve all heard stories of projects that went over budget, took months longer than expected, or ended with disappointing results. The best way to avoid these common pitfalls is to be prepared. Knowing how to properly vet a contractor, what to look for in a quote, and which questions to ask can empower you to make a confident choice. This guide is designed to help you sidestep common hiring mistakes and find a reliable partner. We’ll show you what separates the top bathroom renovation experts in San Jose from the rest.

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Key Takeaways

  • Look Beyond the Portfolio: A great renovation partner has more than just pretty pictures. Protect your investment by verifying their license and insurance, speaking directly with past clients, and confirming they have a solid project management process.

  • Put the Plan on Paper: Clear communication starts with a detailed contract. Before signing, ensure your agreement includes an itemized breakdown of costs, a realistic timeline, and a clear process for handling any changes or unexpected issues.

  • Focus on Overall Value, Not Just the Lowest Bid: The cheapest quote can lead to costly problems from subpar materials or inexperienced labor. A quality result comes from a contractor who offers a fair price and stands behind their work with a strong warranty.

What to Look for in a Bathroom Renovation Pro

Choosing the right professional for your bathroom remodel is the single most important decision you’ll make. This isn’t just about hiring someone with a toolbox; it’s about finding a partner who can bring your vision to life while managing all the complex details. A great contractor or design-build firm acts as your guide, helping you select materials, create a functional layout, and ensure the final result is exactly what you dreamed of. They are the difference between a stressful, drawn-out project and a smooth, rewarding transformation.

When you start your search, you’ll want to look beyond a flashy portfolio. The best pros combine technical skill with excellent project management and clear communication. They should have a deep understanding of local San Jose building codes and a portfolio that proves their expertise in creating beautiful, functional bathrooms. Think of it as hiring for a long-term relationship—you’ll be working closely with this team for weeks or even months. Taking the time to find a professional with the right experience, credentials, and communication style will set your home remodeling project up for success from day one.

Experience and Specialization

When it comes to bathroom renovations, experience is more than just a number—it’s about specialized knowledge. Look for a contractor who focuses on bathrooms. They’ll understand the specific challenges of these spaces, from waterproofing and ventilation to plumbing and electrical layouts. An experienced pro knows the ins and outs of San Jose’s building codes and can recommend materials that stand up to moisture and daily use.

Ask to see a portfolio of their completed bathroom projects. Do their past projects align with your style? A seasoned professional will have a track record of turning unique ideas into reality and can offer valuable bathroom renovation tips that you might not have considered, ensuring your new space is both beautiful and built to last.

Proper Licensing and Insurance

Never skip this step. A reputable contractor will always be properly licensed and insured, and they should be happy to provide proof. In California, a contractor should have a valid license from the Contractors State License Board (CSLB). This shows they’ve met the state’s requirements for testing and experience.

Equally important are liability insurance and workers' compensation. Liability insurance protects your home from accidental damage during the project, while workers' compensation covers any injuries that might happen on-site. Hiring a fully insured contractor gives you peace of mind, knowing you’re protected from financial risk. It’s a clear sign that you’re working with a professional who takes their business—and your project—seriously.

Design and Project Management Skills

A successful bathroom remodel requires more than just construction; it demands strong design and project management. A design-build firm is often a great choice because they handle everything from the initial concept to the final touches. They have the skills to create a cohesive design that reflects your personal style while maximizing functionality. Look for a team known for its exceptional craftsmanship and attention to detail.

A well-managed project runs on a clear timeline with organized scheduling of tradespeople, material deliveries, and inspections. This ensures your renovation stays on track and minimizes disruption to your daily life. A pro with strong project management skills will keep you informed every step of the way, making the entire process feel seamless and organized.

Clear Communication and Transparency

Open and honest communication is the foundation of a great working relationship with your contractor. From the very first meeting, you should feel comfortable asking questions and confident that you’re being heard. A good contractor is transparent about their process, providing a detailed scope of work so you know exactly what to expect. They should set realistic timelines and keep you updated on progress, especially if unexpected issues arise.

A professional who cares about their reputation will be upfront and clear in all their dealings. This transparency builds trust and ensures there are no surprises along the way. Look for a team that is responsive, easy to talk to, and committed to making sure you feel confident and informed throughout your entire renovation.

San Jose's Top Bathroom Renovation Experts

Finding the right team for your bathroom renovation can feel like a huge task, but San Jose is home to some truly fantastic professionals. The key is to find a company that aligns with your specific goals, whether you’re dreaming of a complete spa-like overhaul or need a quick, functional update. Some contractors are masters of high-end, custom designs, while others excel at delivering beautiful results on a tighter timeline. To help you get started, I’ve put together a list of some of the most reputable bathroom renovation experts in the area. Each one brings something different to the table, from meticulous craftsmanship to efficient solutions.

Barcci Builders

If you’re looking for a truly custom, high-end transformation, Barcci Builders is a name that consistently comes up. They are known for their meticulous attention to detail and a deep commitment to bringing a client's unique vision to life. Rather than offering one-size-fits-all solutions, their team focuses on personalized design and expert craftsmanship to create spaces that are both beautiful and functional. Their portfolio showcases a talent for turning ordinary bathrooms into luxurious retreats. This is the team you call when you want a partner to manage a complete home remodeling project with precision, ensuring the result reflects your personal style.

Bath Planet

For homeowners who prioritize speed and efficiency without sacrificing style, Bath Planet is a compelling option. They have built a strong reputation on completing many tub and shower installations in as little as one day. This streamlined approach is ideal if you can’t afford the disruption of a long renovation. While their focus is on quick turnarounds for the wet areas of the bathroom—like tubs, showers, and wall surrounds—Bath Planet of San Jose delivers durable and attractive results. They are a great choice for making a significant impact on your bathroom’s function and appearance on a condensed timeline.

Five Star Bath Solutions

Five Star Bath Solutions strikes a great balance between quality and safety. They offer a wide range of services, from tub-to-shower conversions to more comprehensive bathroom makeovers. One of their key specializations is creating safer, more accessible bathrooms with features like walk-in tubs and low-threshold showers. This focus makes them a go-to for homeowners planning to age in place or who have mobility concerns. Clients often praise Five Star Bath Solutions of San Jose for their professional installers and customer satisfaction, making them a reliable choice for practical and stylish upgrades.

De Mattei Construction

With decades of experience in the Bay Area, De Mattei Construction is a highly respected firm known for its quality work and transparent process. They handle a wide range of remodeling projects, and their approach to bathroom renovations is rooted in clear communication and detailed planning. The team at De Mattei Construction works closely with clients from the initial design phase to the final walkthrough, ensuring there are no surprises. Their emphasis on client satisfaction and a proven track record have earned them a loyal following and a reputation as one of San Jose’s most trusted remodeling experts.

Common Services from Bathroom Renovation Pros

When you start looking for a bathroom contractor in San Jose, you’ll find that professionals offer a wide range of services. Whether you’re dreaming of a complete spa-like transformation or need a practical update to a specific feature, there’s a service to match. Understanding what contractors typically offer can help you clarify your own project goals and find the right team for the job. Some projects involve a complete overhaul, taking the room down to the studs and rebuilding it from scratch. Others are more targeted, focusing on updating a single element like the shower or tub to improve function and style. From full-scale custom remodels to quick and efficient installations, here are some of the most common services you can expect from local renovation experts.

Custom Full-Bathroom Remodels

If you want to completely reimagine your space, a custom full-bathroom remodel is the way to go. This service involves more than just swapping out a vanity or a faucet; it’s a comprehensive overhaul. Pros will gut the room down to the studs, allowing for new layouts, updated plumbing and electrical, and a totally fresh start. This is your chance to create a truly personalized bathroom remodel with elegant designs, high-quality finishes, and features that bring you comfort. Working with a design-build firm on a custom project means every detail, from the tile selection to the lighting placement, is tailored to your vision and lifestyle.

Tub-to-Shower Conversions

One of the most popular bathroom updates is the tub-to-shower conversion. Many homeowners find they rarely use their bathtub and would prefer the convenience and spaciousness of a walk-in shower. This renovation can make a small bathroom feel larger and more open, while also creating a more modern aesthetic. Contractors can design a new shower with features like frameless glass doors, a built-in bench, multiple showerheads, and stylish tile niches for storage. It’s a functional upgrade that can dramatically change the look and feel of your bathroom without requiring a complete gut renovation.

Walk-In Tubs and Luxury Upgrades

For those focused on safety, accessibility, or simply creating a more luxurious experience, specialized upgrades are key. Many contractors specialize in creating safer bathrooms with features like walk-in tubs, barrier-free showers, grab bars, and non-slip flooring. These modifications are perfect for anyone planning to age in place or who has mobility challenges. Beyond safety, you can also explore high-end upgrades to turn your bathroom into a personal retreat. Think heated floors for chilly mornings, steam showers for a spa-like experience, or smart mirrors with integrated lighting and anti-fog technology.

Quick-Install Solutions

Sometimes, you don’t need a full-scale renovation—you just need a fast and effective solution for a dated or worn-out feature. Many companies offer quick-install services, particularly for the wet area of the bathroom. It’s possible to have a brand-new tub or shower system installed in as little as one day. These solutions often use durable, low-maintenance materials like acrylic that are custom-fitted over your existing space. This approach minimizes disruption to your daily life and is an excellent option if your primary goal is to update an old bathtub or shower without the timeline of a complete remodel.

How to Vet a Contractor's Reputation

Finding a contractor you trust is just as important as finalizing your design. A great reputation is built on more than just beautiful finished projects; it’s about communication, reliability, and professionalism from start to finish. Taking the time to properly vet your potential partners will give you peace of mind and set your project up for success. Here’s how you can look beyond the portfolio and understand who you’ll be working with.

Reading Online Reviews (and Between the Lines)

Online reviews are a great starting point, but it’s important to read them with a critical eye. Look for patterns in the feedback. Do clients consistently praise the contractor's communication and transparency? A reputable pro will be upfront about their process and how they manage the project. Pay close attention to how reviewers describe the contractor’s handling of common pitfalls, like scheduling delays or unexpected issues. The best reviews often detail not just the beautiful outcome but also the smooth, professional experience that led to it.

Verifying Credentials and Speaking to References

Before you sign any contracts, do your due diligence by verifying a contractor’s credentials. Confirm they hold all the necessary licenses and insurance required to work in your area. This protects you and ensures they adhere to local building codes and standards. Don’t stop there—ask for a list of recent references and actually call them. Speaking directly with past clients gives you a chance to ask specific questions about their experience, from the initial design phase to the final walkthrough. This firsthand insight is often more telling than a curated online review.

Seeing How They Respond to Challenges

Even the most perfectly planned renovation can hit a snag. What separates a good contractor from a great one is how they respond when things don’t go according to plan. A reliable partner will communicate proactively, present clear solutions, and work with you to resolve issues, not disappear when a problem arises. It’s always wise to prepare for unexpected expenses with a contingency fund. Discussing how potential challenges are handled before the project begins can reveal a lot about a contractor’s problem-solving skills and commitment to client satisfaction.

Key Questions to Ask a Potential Contractor

Once you’ve narrowed down your list of potential contractors, it’s time to start the interview process. Think of this as a two-way conversation to see if you’re a good fit for each other. Having a set of specific questions ready helps you compare each candidate fairly and ensures you’re covering all the important bases. This preparation is key to finding a partner who can bring your vision to life with skill and professionalism.

Can You Confirm Your License, Insurance, and Warranty?

This should always be your first question. A reputable contractor will have no problem providing their license number, proof of liability insurance, and workers' compensation coverage. These credentials protect you, your home, and the workers on the project. A professional home remodeling expert cares about their reputation and will be transparent. Also, be sure to ask about their warranty. Understanding what is covered after the project is complete—and for how long—gives you peace of mind and shows that the contractor stands behind the quality of their work.

What’s Your Project Timeline and Management Process?

Understanding how a contractor manages their projects is crucial for a smooth renovation. Ask for a clear start date, an estimated completion date, and a breakdown of the major milestones along the way. You’ll also want to know who your primary point of contact will be and how they’ll keep you updated on progress. Do they schedule weekly check-ins or send daily updates? A well-defined communication plan and a clear project timeline prevent misunderstandings and help keep everything on track from demolition day to the final walkthrough.

How Do You Support Material and Design Selections?

A bathroom remodel involves dozens of decisions, from tile and countertops to fixtures and lighting. It’s important to know how a contractor will guide you through this process. Ask if they have an in-house designer or if they partner with local showrooms. Do they provide curated options based on your style and budget, or will you be responsible for sourcing everything yourself? This is especially important for a custom home build, where every detail matters. Understanding their level of design support ensures you get the cohesive, beautiful result you’re hoping for.

How Do You Handle Unexpected Issues?

Even with the best planning, surprises can happen during a renovation—like discovering old plumbing or hidden water damage behind a wall. A seasoned contractor knows this and has a plan in place. Ask them how they manage unforeseen problems and communicate them to you. How are change orders handled, and what is the approval process? It’s also a good sign when a contractor discusses a contingency fund with you from the start. This proactive approach to unexpected expenses shows they are experienced and committed to transparency.

What Factors Shape a Bathroom Renovation?

When you start dreaming up your new bathroom, it’s easy to focus on the fun stuff, like tile patterns and faucet finishes. But a successful renovation is shaped by a few key factors that go beyond aesthetics. Understanding the scope of your project, navigating local San Jose guidelines, and preparing for potential surprises are all crucial parts of the process. Getting a handle on these elements early on will help you set a realistic plan and ensure your project runs smoothly from start to finish.

Project Scope and Material Quality

The first thing to define is your project's scope. Are you planning a simple cosmetic update with new paint and fixtures, or a full-gut home remodeling project that involves moving walls and plumbing? Changing the layout, especially the plumbing, significantly expands the scope and complexity. Beyond the scale of the work, the materials you choose play a huge role. While it’s tempting to go for the most stylish option, it’s important to balance aesthetics with function. Skimping on quality for things like waterproofing, ventilation, and durable flooring can lead to problems down the road. A great contractor will help you select materials that are not only beautiful but also built to last in a high-moisture environment.

Local Labor and Permit Guidelines

Working in San Jose means navigating specific local regulations. Most bathroom remodels that go beyond simple cosmetic changes will require a permit from the city. This is to ensure all electrical and plumbing work is done safely and up to code. An experienced local contractor will know exactly what permits are needed and will handle the application process for you. It’s also wise to plan for the unexpected. Issues like old plumbing that needs updating or minor structural repairs can pop up. That’s why we always recommend setting aside a contingency fund, which gives you a buffer to handle any surprises without derailing your bathroom renovation.

Uncovering Hidden Issues

The biggest unknowns in any renovation are hiding behind the walls. Once demolition begins, it’s not uncommon to uncover hidden issues like water damage, mold, or outdated wiring that must be addressed before you can move forward. While these discoveries can be stressful, they are also why you hire a professional. A seasoned team can identify and resolve these problems efficiently, ensuring your new bathroom is built on a safe and solid foundation. Planning for these potential challenges is a key part of a successful home renovation checklist, as it helps prevent your project from going over budget or taking longer than expected.

Exploring Your Financing Options

A bathroom renovation is a valuable investment in your home, but it doesn't have to strain your finances. Understanding the financial pathways available can make the entire process feel much more manageable. Many San Jose contractors offer flexible financing plans to help you bring your vision to life without immediate financial pressure. Exploring these options is a key step in planning your project and finding a solution that aligns with your budget. It’s all about finding a smart strategy that makes your dream bathroom an achievable reality.

Flexible and Monthly Payment Plans

Many contractors offer financing that breaks down the total project cost into predictable monthly payments. This approach allows you to invest in the high-quality materials and expert craftsmanship your home deserves without a large upfront payment. It’s a practical way to get the bathroom you’ve always wanted while keeping your budget comfortable. This option provides the breathing room to make decisions based on your vision, not just your immediate cash flow, ensuring you don’t have to compromise on your overall home remodeling goals.

Zero-Down Payment Programs

For homeowners who want to start their project without a large initial investment, zero-down payment programs can be an ideal solution. These plans allow you to begin your renovation without any upfront payment, removing a major hurdle for many. This makes it much easier to commit to your project and see progress right away. It’s a fantastic option if you’re ready to transform your space but prefer to preserve your liquid assets for other needs, turning your plans into action without delay.

Contractor-Specific Promotions

Beyond standard financing, keep an eye out for contractor-specific promotions. Some firms in the San Jose area run special offers, which might include a discount off the total project cost or an upgrade on certain materials. It’s always worth asking a potential contractor if they have any current promotions. Taking advantage of these offers is a smart way to maximize your investment and get the best possible value, ensuring you can allocate more of your budget toward the features and finishes that matter most to you.

How to Compare Quotes from Contractors

Once you’ve received a few quotes for your bathroom renovation, it’s time to sit down and compare them. This part of the process is about more than just finding the lowest number; it’s about understanding what each contractor is truly offering. A detailed quote is a window into a company’s professionalism, transparency, and process. Think of it as the first step in building a partnership. A great contractor will provide a clear, comprehensive proposal that answers your questions before you even have to ask them.

Comparing quotes effectively helps you see the full picture of your investment. You’ll be able to weigh the costs against the quality of materials, the scope of work, and the level of service you can expect. This is where you can spot potential red flags, like a bid that seems too good to be true or a proposal that’s frustratingly vague. Taking the time to carefully review each detail ensures you’re choosing a partner who will deliver the beautiful, functional bathroom you’ve envisioned, without stressful surprises along the way. It’s your home, and you deserve to feel confident in the team you hire to transform it.

Requesting an Itemized Estimate

A single bottom-line number doesn’t tell you much. To truly compare your options, you need an itemized estimate from each contractor. This detailed breakdown should clearly list the costs for labor, materials, permits, and any other expenses. It allows you to see exactly where your money is going and helps you compare the bids on an apples-to-apples basis. A professional contractor will have no problem providing this level of detail. Also, be sure to ask for a clear start date, an estimated completion date, and a schedule of major milestones. This project timeline shows you how they plan to manage the renovation from start to finish.

Looking Beyond the Lowest Bid

It’s always tempting to go with the lowest bid, but this can often be a mistake in the long run. An unusually low price might indicate that a contractor is using subpar materials, hiring less-skilled labor, or cutting corners somewhere else. Instead of focusing solely on price, consider the overall value. A contractor’s experience, reputation, and communication style are just as important. Take some time to check online reviews and see what past clients have to say about their work. A slightly higher quote from a reputable, experienced builder often translates to a smoother process and a higher-quality result that you’ll be happy with for years to come.

Comparing Warranties and Service Guarantees

A contractor’s warranty is a direct reflection of their confidence in their workmanship and materials. When you’re comparing quotes, pay close attention to the warranties each company offers. A top-tier contractor will stand behind their work with a comprehensive guarantee that covers parts, labor, and materials, giving you long-term peace of mind. Some firms even offer a lifetime warranty that can be transferred to the next owner if you decide to sell your home, which can be a great selling point. Don’t be afraid to ask for the warranty details in writing. This isn’t just a piece of paper; it’s a promise of quality and a commitment to your satisfaction long after the project is complete.

Common Hiring Mistakes to Avoid

Finding the right partner for your bathroom renovation is just as important as picking out the perfect tile. The contractor you choose will be in your home for weeks, managing a significant investment and bringing your vision to life. It’s a big decision, and a few common missteps can lead to frustration, delays, and extra costs. By being aware of these potential pitfalls from the start, you can move forward with confidence and find a team that truly understands your goals and respects your home. Let’s walk through the most common hiring mistakes so you can sidestep them entirely.

Rushing the Selection Process

In the excitement of starting a new project, it’s easy to want to hire the first contractor who seems capable and get the ball rolling. However, rushing this decision is one of the biggest mistakes you can make. A bathroom remodel involves complex systems, from plumbing to electrical, and thorough planning is essential to get it right. Taking your time to properly vet candidates allows you to find an experienced professional who understands local San Jose building codes and conditions. Think of this phase as building the foundation for a successful project—a little extra diligence now ensures you find a true partner you can trust to manage the details.

Choosing Based on Price Alone

While budget is always a key consideration, selecting a contractor based on the lowest bid can be a recipe for disappointment. An unusually low estimate often signals that corners are being cut, whether through subpar materials, less-skilled labor, or an incomplete understanding of the project's scope. Skimping on quality materials to save money upfront can lead to costly repairs and replacements down the line. Instead, view your project as a long-term investment in your home’s value and your daily comfort. A quality-focused home remodeling expert will provide a fair, detailed quote that reflects high-quality work and durable materials, ensuring a beautiful result that lasts.

Not Setting Clear Expectations

A successful renovation is built on clear, consistent communication. A common mistake is failing to establish a detailed vision and scope of work before the project begins. This can lead to misunderstandings about everything from the budget and timeline to functional details like proper ventilation or the balance between style and practicality. A great contractor will guide you through this process, asking questions to understand your needs and translating your ideas into a concrete plan. Before signing a contract, make sure every detail is documented, from material selections to the payment schedule. This ensures you and your contractor are aligned and working toward the same beautiful outcome.

How to Prepare for Your Renovation Project

Once you’ve vetted your top candidates and feel confident in your choice, it’s time to get ready for the project itself. Proper preparation is the key to a smooth and enjoyable renovation experience. It involves getting clear on your timeline and budget, figuring out the logistics of living at home during construction, and understanding the final steps before the work begins. Taking the time to plan these details with your contractor will help set clear expectations and ensure everyone is on the same page from day one, turning your vision into a reality with minimal stress.

Aligning on a Timeline and Budget

A successful home remodeling project starts with a realistic timeline. Depending on the scope and complexity, a bathroom renovation can take a few months from start to finish, so it’s important to discuss the schedule with your contractor to understand each phase. It’s also crucial to establish a clear budget. While your contractor will provide a detailed estimate, it’s always wise to have a financial cushion. Unexpected issues, like discovering old plumbing that needs updating, can arise once the walls are opened up. Planning for a contingency of about 10-20% for these surprises helps keep the project on track without derailing your finances.

Planning for Life During Construction

Renovations can be disruptive, but a little planning goes a long way in making life manageable. Talk to your contractor about what to expect day-to-day. While you can often stay in your home during the remodel, there might be short periods where utilities like water need to be shut off. You may want to arrange a temporary alternative for a day or two. Think about how the construction will affect your daily routine. Sealing off the work area can help contain dust, but it’s still a good idea to protect your furniture in nearby rooms and clear pathways for the construction team to move through your home safely.

Making Your Final Choice and Signing the Contract

When you’re ready to make a final decision, look for a contractor who provides a transparent and detailed estimate that itemizes all the costs. Be cautious of bids that seem significantly lower than others, as this can sometimes indicate that corners are being cut on materials or labor. Before signing anything, review the contract carefully. It should include the full project scope, a clear timeline, the payment schedule, and details on how any changes or unexpected issues will be handled. A thorough contract protects both you and your builder and serves as the roadmap for your entire project.

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Frequently Asked Questions

What’s the real difference between a design-build firm and a general contractor? Think of a design-build firm as your all-in-one partner for the entire project. They have an in-house team that handles everything from the initial design concepts and material selection to the construction and final touches. This creates a single, seamless process. A general contractor, on the other hand, typically executes a plan that has already been created by a separate architect or designer. Both can deliver great results, but a design-build approach is often ideal for custom projects where you want a cohesive vision from start to finish.

How long does a bathroom renovation actually take? The timeline for a bathroom renovation can vary quite a bit depending on the scope of your project. A simple, quick-install solution for a tub or shower might be done in just a day or two. However, a full custom remodel that involves changing the layout, moving plumbing, and getting permits will naturally take longer, often spanning several weeks or even a couple of months. A professional contractor will give you a detailed project schedule so you know exactly what to expect.

Why is an unusually low bid considered a red flag? It's tempting to jump on the lowest price, but an estimate that's significantly cheaper than others can be a warning sign. It might mean the contractor is using lower-quality materials that won't last, cutting corners on crucial steps like waterproofing, or isn't carrying the proper license and insurance. A quality renovation is an investment, and a fair price reflects skilled labor, durable materials, and a professional process that protects your home.

What happens if my contractor finds unexpected problems like mold or old plumbing? This is more common than you might think, especially in older homes. A seasoned professional won't be rattled by it. They should immediately stop work, inform you of the issue, and clearly explain your options for fixing it. Any changes to the scope of work and budget will be handled through a formal change order that you approve before any new work begins. This transparency is a key sign you're working with a true professional.

Do I really need a permit just to update my bathroom? If your project is purely cosmetic—like painting or replacing a faucet without changing the plumbing—you likely won't need a permit. However, if you plan to move walls, change the layout, or alter any of the electrical or plumbing systems, you will almost certainly need a permit from the city of San Jose. An experienced local contractor will know exactly what's required and will manage the entire permitting process for you to ensure your new bathroom is safe and up to code.