Millbrae Zoning Intelligence
Zoning, permitted uses, ADU rules, and development potential for Millbrae, California. 14 districts analyzed.
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How is Millbrae zoned?
Permitted uses vary by district. Search a Millbrae parcel on the map above to see exactly what you can build there.
- Total zoning districts14
- Residential districts5
- Commercial districts5
- Industrial districts1
Statewide law - applies to all California cities, not specific to Millbrae.
- 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 Millbrae planning
What should developers know about Millbrae zoning?
Millbrae is a compact Peninsula city whose zoning makes its transit-oriented ambitions plain. Of its 14 districts, Single Family Residential (R-1) is overwhelmingly the largest at roughly 1,132 acres, with a large-lot variant (R-1-LL) layered on top, so the bulk of the city is detached housing. But the more interesting story for developers is the cluster of mixed-use districts built around the BART and Caltrain station: the Millbrae Station Area Specific Plan (MSAPS) covers about 116 acres, complemented by Downtown Mixed Use (DMU), Corridor Mixed Use (CMU, roughly 66 acres), Neighborhood Commercial Mixed Use (NCMU) and Residential Focused Mixed Use (RFMU).
That mixed-use framework is where height and density are concentrated, and it signals the city's intent to absorb growth near transit rather than in established single-family neighborhoods. Middle-density housing has dedicated room as well, through Duplex or Triplex Residential (R-2, about 91 acres) and Multiple Family Residential (R-3). Employment and service land is comparatively modest - a single Commercial (C) district, an Industrial (I) district, and Public Facilities (PF) - while Open Space (OS) accounts for roughly 276 acres.
For a buyer, the practical read is that the entitlement path depends heavily on which mixed-use or residential code a parcel carries, and the city's full set of building controls (FAR, lot, density, coverage, pervious, lot width, height, and setbacks) will govern the form. This is pre-development intelligence, not legal advice - verify with the local planning department before acquisition.
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Try ArchiWise free →Millbrae, 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 Commercial | - | - | 5.4 ac |
CMU Corridor Mixed Use | - | - | 66.3 ac |
DMU Downtown Mixed Use | - | - | 17.3 ac |
I Industrial | - | - | 34 ac |
What are the building controls in Millbrae?
Setback, height, FAR, lot area, and density controls enforced across Millbrae zoning districts.
- Assorted
- Far control
- Lot control
- Multi control
- Density control
- Coverage control
- Pervious control
- Lot width control
- Rear setback control
- Side setback control
- Front setback control
- Building height control
Cities near Millbrae
Millbrae zoning: frequently asked questions
What makes the Millbrae Station Area Specific Plan (MSAPS) important for developers?
MSAPS covers roughly 116 acres around the BART and Caltrain station and is the city's primary vehicle for transit-oriented, higher-intensity development. If you are pursuing density near transit, this district - together with Downtown Mixed Use (DMU) - is where the city has signaled it wants growth to land, so it typically offers the most favorable form standards in Millbrae.
Where can mixed-use projects be built in Millbrae?
Mixed use is spread across several purpose-built districts: the Station Area Specific Plan (MSAPS), Downtown Mixed Use (DMU), Corridor Mixed Use (CMU), Neighborhood Commercial Mixed Use (NCMU) and Residential Focused Mixed Use (RFMU). Each tunes the residential-to-commercial balance differently, so confirm which one applies before assuming a project's program will fit.
How much of Millbrae is single-family residential?
The R-1 Single Family Residential district is by far the largest in the city at around 1,132 acres, plus a large-lot R-1-LL variant. The city's growth strategy therefore steers intensification toward the transit-area mixed-use districts rather than the established detached-home neighborhoods.
Is there room for middle-density or duplex housing in Millbrae?
Yes - R-2 (Duplex or Triplex Residential) covers about 91 acres and R-3 (Multiple Family Residential) provides additional multifamily capacity. With California's SB-9 and ADU laws also in play statewide, there are multiple paths to add units, but the parcel's base district still sets the baseline density and form. Verify the applicable standards before designing.
What are the options for industrial or commercial use in Millbrae?
Employment land is limited: there is a single Commercial (C) district, an Industrial (I) district of roughly 34 acres, and Public Facilities (PF). Because dedicated industrial and standalone commercial supply is small, investors seeking those uses should expect competition and may find more flexibility in the mixed-use corridors that allow ground-floor commercial.
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Zoning data is pre-development intelligence, not legal advice. Verify with the Millbrae planning department before acquisition or design.