ADU & Home Additions in Campbell
Add a backyard cottage, garage conversion, or home addition to your Campbell property — designed to match your home and maximize your investment.
How Much Does ADU & Home Additions Cost in Campbell?
Garage conversions from $150K. Detached 1,000-1,200 sq ft ADUs with premium finishes at the higher end.
Every project is unique. We provide a fixed-price contract after your free consultation — no hidden fees, no cost-plus surprises. The price you agree to is the price you pay.
What to Know About ADU & Home Additions in Campbell
Local building codes, neighborhood character, and permit requirements vary by city. Here's what Campbell homeowners should know before starting a project.
- 01Campbell allows ADUs up to 1,200 sq ft on single-family lots and has eliminated parking requirements for ADUs near VTA transit routes, which covers much of the city
- 02The City of Campbell's compact building department processes ADU permits in 5-7 weeks for custom designs — faster than most neighboring cities
- 03Campbell's typical 6,000-7,500 sq ft lots can accommodate a well-designed detached ADU of 500-800 sq ft while maintaining adequate yard space and meeting setback requirements
- 04Campbell development impact fees for ADUs are moderate compared to neighboring cities, typically $4,000-$12,000 depending on unit size — included in our fixed-price contracts
- 05Campbell's walkable downtown, Pruneyard Shopping Center, and proximity to Los Gatos make ADUs here particularly attractive to renters — vacancy rates are very low
Our ADU & Home Additions Process
A clear, structured approach from your first call to final reveal.
Feasibility Assessment
We evaluate your property, zoning, and lot coverage to determine what's possible and what will deliver the best ROI.
Design & Engineering
Our architects create plans that maximize space, light, and livability while meeting all local building codes.
Permits & Approvals
We navigate the full permitting process — city planning, building department, and utility coordination.
Construction
Our experienced crew builds your ADU with the same quality standards as our luxury home remodels.
Inspection & Handover
We manage all inspections, obtain the certificate of occupancy, and walk you through your completed ADU.
ADU & Home Additions in Campbell: FAQ
Answers to common questions from Campbell homeowners.
A typical Campbell ADU takes 5-7 months from permit submission to move-in. Permitting takes 5-7 weeks, and construction runs 4-5 months depending on size and complexity. Garage conversions are faster — typically 3-4 months of construction. Campbell's efficient building department keeps the pre-construction phase shorter than many neighboring cities.
A one-bedroom ADU in Campbell typically rents for $2,400-$2,900/month depending on size, finishes, and proximity to downtown. Two-bedroom units command $2,800-$3,400. Campbell's walkable downtown, strong schools, and small-town character make ADUs here easy to rent at premium rates.
Most Campbell single-family lots can accommodate a detached ADU. Key factors include lot size, existing lot coverage, setback requirements (4 feet from side and rear property lines), and utility access. We provide a free site feasibility assessment to determine your property's ADU potential and optimal placement.
Yes. Campbell allows garage conversions and does not require you to replace the lost parking. A two-car garage conversion yields approximately 400-500 sq ft — ideal for a studio or one-bedroom unit. This is the most cost-effective ADU option and has the smallest lot impact.
No. Campbell does not require owner-occupancy for properties with ADUs. You can rent both your primary home and your ADU, live in the ADU and rent the main house, or use the ADU for family. This flexibility makes ADUs an excellent investment regardless of your living arrangements.
A standard ADU can be up to 1,200 sq ft and can be detached or attached. A Junior ADU (JADU) is converted from existing space within your home — typically a bedroom or attached garage — and is limited to 500 sq ft. Campbell allows both a JADU and an ADU on the same property, giving you up to three units total.
More Services in Campbell
Explore our other design-build services available in Campbell.
Ready to Start Your Campbell ADU & Home Additions?
Book a free in-home consultation. We'll discuss your vision, walk through your space, and provide a detailed fixed-price estimate — no pressure, no obligation.