ADU Builders in San Bruno, California
With about 43,000 residents and housing costs that keep climbing, San Bruno homeowners are turning backyards into income. Our San Bruno ADU builders handle design, San Mateo County-area permitting and construction under one contract, built for the cool microclimates, fog belts and seismic activity.
Typical cost
$243k–$504k
Permit time
4–8 weeks
Est. rent
$2,500+/mo
Population
43,000
Popular ADU types in San Bruno
Our most requested projects in San Bruno are attached ADUs and prefab and modular ADUs. Corner lots and alley-access lots in San Bruno are ideal for ADUs with their own street entrance and separate address.
Design-wise, San Bruno homeowners in the Bay Area tend to favor compact, light-filled modern designs that maximize small urban lots.
Building an ADU in San Mateo County
Every San Bruno ADU we build is engineered around local conditions — especially seismic engineering, sewer lateral rules and high labor costs. We prepare complete plan sets so the city can approve within the state's 60-day review window, typically 4–8 weeks here.
At $2,500–$4,050 per month in rent, a new ADU in San Bruno can pay for itself in roughly 9.5 years.
San Bruno ADU FAQs
How much does it cost to build an ADU in San Bruno?
Most San Bruno ADUs we build land between $243k and $504k, depending on size, site work and finishes. Garage conversions sit at the low end; custom two-story units at the high end.
How long does ADU permitting take in San Bruno?
State law requires cities to act on complete ADU applications within 60 days. In practice, San Bruno permits typically take 4–8 weeks when plans are submitted complete — which is what our in-house drafting team focuses on.
What can I rent an ADU for in San Bruno?
Based on Bay Area rental trends, a new 1-bedroom ADU in San Bruno commonly rents for $2,500–$4,050 per month, putting typical payback around 9.5 years.
What are the biggest challenges for ADUs in San Bruno?
In San Bruno and the wider Bay Area, the issues we plan around most are seismic engineering, sewer lateral rules and high labor costs. We review these during a free feasibility check before you commit.
Is attached ADUs a good option in San Bruno?
Yes — attached ADUs are among the most popular projects we build in San Bruno. Across San Bruno, we see strong demand for 1-bedroom units around 600 sq ft — the sweet spot for build cost versus rental income.
ADU builders near San Bruno
Get a free ADU feasibility check in San Bruno
Tell us about your lot. We'll review zoning, setbacks and utilities and send a ballpark budget — no obligation.