ADU & Home Additions in Woodside

California state law allows detached ADUs up to 1,200 sq ft and Junior ADUs up to 500 sq ft. Woodside's large lots typically accommodate the full 1,200 sq ft easily, but tree protection zones, creek setbacks, and hillside grading restrictions may influence placement. We conduct a thorough site analysis before design begins.

Yes, barn-to-living-space conversions are one of the most rewarding projects we do in Woodside. The existing structure provides character and bones, but typically requires new foundation work, insulation, electrical, plumbing, and fire-rated assemblies to meet residential building code. Costs vary widely based on the structure's condition.

Woodside's Heritage Tree Ordinance protects oaks over 12" in diameter, redwoods, and other significant trees. ADU placement must avoid root zones (typically 1 foot of radius per inch of trunk diameter). We work with ISA-certified arborists to map tree protection zones and design ADU footprints that preserve the property's mature canopy.

Standard ADU permits in Woodside take 6-10 weeks for plan check. Projects requiring scenic corridor review, septic evaluation, or grading permits may take 10-16 weeks. Total timeline from initial design to move-in is typically 12-16 months for a detached ADU.

Yes, but the well must produce sufficient volume for the additional dwelling. We recommend a well yield test and water quality analysis before design begins. If the well is insufficient, options include storage tanks, shared connection agreements, or (in some areas) municipal water connection. Water filtration and softening should be included in the ADU design.

ADUs that succeed in Woodside's design review process complement the natural setting — think board-and-batten siding in natural tones, standing-seam metal or cedar shake roofs, stone entry walls, generous covered porches, and deep overhangs. The goal is a structure that looks like it has always been part of the property, not a prefab dropped onto the lot.