Foster City Zoning Intelligence
Zoning, permitted uses, ADU rules, and development potential for Foster City, California. 23 districts analyzed.
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How is Foster City zoned?
Permitted uses vary by district. Search a Foster City parcel on the map above to see exactly what you can build there.
- Total zoning districts23
- Residential districts9
- Commercial districts7
- Industrial districts1
Statewide law - applies to all California cities, not specific to Foster City.
- California state ADU lawApplies statewide
- SB-9 lot split eligibilityPer parcel review
- SB-79 (transit-oriented housing)Near transit, from Jul 2026
- Density Bonus Law (state)Eligible projects
- Local impact / permittingVerify with Foster City planning
What should developers know about Foster City zoning?
Foster City is a planned San Mateo County community built on engineered land along the bay, and its zoning is defined by two features: a heavy reliance on Planned Development and a notable set of affordable-housing overlays. Nearly every district carries a /PD suffix, signaling that the city was master-planned and that most parcels are governed by adopted development plans. The dominant residential district is Single Family Residence (R-1, about 506 acres), with a planned-development variant R-1/PD adding roughly 191 acres, and a substantial Townhouse Residence Planned Development (R-T/PD, about 237 acres) supplying attached for-sale product.
What distinguishes Foster City is its layered housing-overlay structure. The medium and high-density residence districts come in escalating overlay tiers - R-3/PD/AHO (Medium Density with Affordable Housing Overlay), R-4/PD (High Density), R-4/PD/AHO, and R-4/PD/AHO/BRHO, which adds a By Right Housing Overlay - reflecting a deliberate framework for affordable and streamlined housing production. There is also a Senior Housing Overlay on part of the Commercial Mix district (C-M/PD/SHO). The largest single district is Commercial Mix Planned Development (C-M/PD, about 381 acres), the heart of the city's office and employment base, supported by General Business (C-2/PD, about 103 acres) and Light Industrial (M-1/PD). Open Space and Conservation (OSC) and its aquatic-development variant (OSC/W, about 191 acres) reflect the lagoon system the city is built around. With FAR, lot, density, coverage, pervious, lot-width, setback, and height controls in force - and PD plans and housing overlays on top - the controlling development plan and any applicable overlay are decisive for any Foster City parcel.
This is pre-development intelligence, not legal advice - verify with the local planning department before acquisition.
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Try ArchiWise free →Foster City, California Zoning Districts: What Do They Mean?
Zoning districts are areas regulated by specific laws that determine land use, building types, and development rules. Each district below shows its zone type and which uses it permits.
| Zone Code | Zone Type | Permitted Uses | Area |
|---|---|---|---|
C-1 Neighborhood Business District | - | - | 2.3 ac |
C-1/PD Neighborhood Business Planned Development | - | - | 8.9 ac |
C-2/PD General Business Planned Development | - | - | 103.2 ac |
C-A Commercial Automobile Repair And Service District | - | - | 3.5 ac |
What are the building controls in Foster City?
Setback, height, FAR, lot area, and density controls enforced across Foster City zoning districts.
- Far control
- Lot control
- Density control
- Coverage control
- Pervious control
- Lot width control
- Rear setback control
- Side setback control
- Front setback control
- Building height control
Cities near Foster City
Foster City zoning: frequently asked questions
What do the AHO and BRHO overlays mean in Foster City?
AHO stands for Affordable Housing Overlay and BRHO for By Right Housing Overlay. They appear on the medium and high-density residence districts - for example R-3/PD/AHO, R-4/PD/AHO, and R-4/PD/AHO/BRHO - and they layer affordable-housing and streamlined-approval provisions onto the base planned-development zoning. For a housing developer, these overlays are the most important feature to identify, since they can change both the affordability requirements and the entitlement path on a given parcel.
Why does almost every Foster City zone have a '/PD' suffix?
Foster City is a master-planned community built on engineered land, and the /PD (Planned Development) suffix reflects that most parcels are governed by adopted development plans rather than generic base-zone rules. The plan for a given site sets its tailored standards. As a result, due diligence here starts with obtaining the controlling development plan for the parcel rather than reading a citywide zoning category.
Where is the city's office and employment base concentrated?
The Commercial Mix Planned Development district (C-M/PD) is Foster City's largest at about 381 acres, and it forms the core of the city's office and employment area. General Business Planned Development (C-2/PD, about 103 acres) and Light Industrial Planned Development (M-1/PD) supplement it. For an office, R&D, or commercial project, C-M/PD is the primary district, and its governing plan will define permitted uses and intensities.
What housing types does Foster City's zoning support?
The range runs from Single Family Residence (R-1, about 506 acres) and its PD variant, through Townhouse Residence Planned Development (R-T/PD, about 237 acres) for attached for-sale product, up to Medium and High Density Residence districts (R-3 and R-4) carrying the affordable-housing overlays. There is also a Senior Housing Overlay on part of the commercial-mix land. The overlay and density tier you target will drive both unit count and affordability obligations.
What is the OSC/W district and why does it matter here?
OSC/W is the Open Space and Conservation Aquatic Development district, covering about 191 acres, and it reflects the lagoon and waterway system that Foster City is built around. It governs the water bodies and associated conservation areas rather than upland development. For waterfront or shoreline-adjacent parcels, this district and the broader open-space framework are important constraints to verify alongside any sea-level-rise and shoreline-protection considerations.
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Zoning data is pre-development intelligence, not legal advice. Verify with the Foster City planning department before acquisition or design.