Local jurisdiction · San Mateo County
Foster City Zoning, Planning & Building Codes
What you can build in Foster City depends on its local zoning and planning code, layered on the California Building Standards Code. Ask GoCodebook about any Foster City address.
Key points
Foster City is a city in San Mateo County, California. Like every California jurisdiction, Foster City regulates development through a local zoning and planning code (often Title 17 Zoning) — the rules that determine allowed uses, setbacks, height limits, FAR, density and parking — on top of the statewide California Building Standards Code (Title 24).
Those local rules change at the city line, so a remodel, ADU or use that is allowed nearby may be restricted in Foster City. GoCodebook reads the Foster City ordinance with state code and answers your zoning, planning or permit question with the controlling citation.
Zoning & planning in Foster City
Foster City's zoning code (often Title 17 Zoning) assigns each parcel to a district (residential, commercial, industrial, mixed-use and overlays) that sets the allowed uses, setbacks, height, FAR, lot coverage and density. Conditional uses, variances and design review may require discretionary planning approval.
Ask GoCodebook "what's the zoning for [address] in Foster City?", "what setback / FAR applies?", or "can I build an ADU or addition here?" and get a cited answer. See coverage.
Building permits & remodeling in Foster City
Construction and remodeling in Foster City must comply with the adopted Building, Residential, Electrical, Plumbing, Energy and Fire codes, plus any Foster City local amendments — and most work needs a building permit.
Additions, remodels and change-of-use can trigger extra requirements (accessibility, energy upgrades, fire). GoCodebook flags what applies to your Foster City project before you apply.
Where to read the Foster City code
The Foster City municipal and zoning code is published on Code Publishing — view the official Foster City code library. That lets you read the ordinance section by section.
GoCodebook goes further: it reads the Foster City ordinance together with the California Building Standards Code and answers your question — zoning, setbacks, FAR, height, ADUs, permits — with the controlling citation for your parcel.
ADUs, housing & tenant rules in Foster City
California's statewide ADU laws override many local restrictions, so Foster City must allow accessory dwelling units that meet state size, setback and parking standards. Rentals may also be subject to rent control and AB 1482 protections.
Whether a specific Foster City property is covered depends on its zoning, age and ownership — exactly the kind of question GoCodebook answers with a citation.
Who this affects
Frequently asked questions
What is the zoning code for Foster City?
Foster City adopts a local zoning ordinance (often Title 17 Zoning) that sets allowed uses, setbacks, height, FAR and density by district, published on Code Publishing, alongside the California Building Standards Code. Ask GoCodebook for your parcel's zoning and what it allows.
What are the setback and FAR rules in Foster City?
Setbacks, floor-area ratio (FAR), height and lot coverage in Foster City are set by your parcel's zoning district. GoCodebook returns the exact standards for your address with a citation.
Do I need a permit to remodel or build in Foster City?
Most new construction, additions and many remodels in Foster City require a building permit and must meet the adopted Title 24 codes plus local amendments. GoCodebook tells you what applies before you apply.
Can I build an ADU in Foster City?
Generally yes — California's statewide ADU law requires Foster City to permit ADUs that meet state standards, even where local rules are stricter.
Ask about any Foster City property
Get a cited, plain-English answer on Foster City zoning, setbacks, FAR, ADUs, remodels and permits — for any address.
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