Local zoning · Millbrae

Millbrae — Zoning

Zoning under the Millbrae local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

Millbrae's zoning is codified in Title 10, Chapter 10.05 of the Millbrae Municipal Code. The chapter establishes the official zoning map, the list of zoning districts (residential, commercial, industrial, planned development and station-area districts, plus combining districts), and the baseline development standards (lot size, coverage, FAR, setbacks, height) and use rules that apply in each district. The ordinance also ties certain areas to the Millbrae Station Area Specific Plan and the Downtown / El Camino Real Specific Plan, and it requires consistency with the city's airport land‑use rules. See MMC § 10.05.0300 and § 10.05.0320 for the district list and the official map.

Note: when this page mentions practical sub-topics (for example parking, design review, or ADUs) it links to Millbrae reference pages for that topic so you can jump to more procedural detail: Millbrae Development Standards, Millbrae Parking, Millbrae Design Review, Millbrae Overlay Districts, Millbrae ADUs, Millbrae Land Use, and the California Building Standards Code (Title 24) where state building rules are relevant.

How the Millbrae ordinance organizes Zoning (short)

  • The city is divided into named districts: R-1LL, R-1, R-2, R-3, C, DTECRSP, I, OS, PF, PD, and MSAPD, plus an -O office combining district. The list is in MMC § 10.05.0300.
  • The official Zoning Map of the City of Millbrae is incorporated into the code and kept on file with the City Clerk; boundaries are determined by that map and by the nearest legal lot line if ambiguous. See MMC § 10.05.0320 and § 10.05.0330.

District-by-district breakdown

Notes on format: each district entry below states (1) purpose (code citation), (2) typical permitted uses, (3) the most decision-relevant dimensional standards or development rules, and (4) where the district rule set lives or how it is applied. All items are grounded in Millbrae MMC citations.

R-1LL (Single‑family Residential Large Lot)

  • Purpose: preserve low-density hillside single-family character. MMC § 10.05.0500.
  • Typical permitted uses: single‑family dwellings, state‑regulated residential care facilities; accessory ADUs and JADUs allowed as accessory uses. MMC § 10.05.0510.
  • Key standards: lot area 10,000 sq ft, lot width 50 ft interior / 60 ft corner, lot coverage 40%, FAR 55%; minimum rear open space (1,000 sq ft in rear one‑third) and two garage parking spaces required per dwelling (see parking table). MMC § 10.05.0520; parking per § 10.05.2100.
  • Where it applies / map: as shown on the official zoning map; boundaries controlled by MMC § 10.05.0320.

R-1 (Single‑family Residential)

  • Purpose: protect detached single‑family neighborhood character. MMC § 10.05.0600.
  • Typical permitted uses: single‑family dwellings, state‑regulated residential care facilities; accessory home occupations, short‑term rentals, ADUs/JADUs. MMC § 10.05.0610.
  • Key standards: lot area 5,000 sq ft, lot width 50 ft interior / 60 ft corner, lot coverage 50%, FAR 55%, minimum 2 garage spaces (see parking). MMC § 10.05.0620 and § 10.05.2100.

R-2 (Duplex/Triplex Residential)

  • Purpose: medium‑density attached housing (duplexes/triplexes). MMC § 10.05.0700.
  • Typical permitted uses: single‑family, duplexes, triplexes, and residential care facilities; ADUs/JADUs as accessory uses. MMC § 10.05.0710.
  • Key standards: lot area 5,000 sq ft (interior) / 6,000 sq ft (corner) / 7,500 sq ft (triplex), lot width 50/60 ft, lot coverage 50%, FAR 88%, parking per § 10.05.2100. MMC § 10.05.0720.

R-3 (Multifamily Residential)

  • Purpose: higher-density apartment areas; requires cooperative service/open space standards. MMC § 10.05.0800.
  • Typical permitted uses: multi‑family dwellings, duplexes/triplexes, some care facilities; a list of conditional uses includes schools, places of worship, medical/professional offices. MMC § 10.05.0810.
  • Key standards: lot width 50/60 ft, min lot area 5,000 sq ft (interior), lot coverage up to 75%, FAR — no limit (i.e., regulated by other standards and specific plan context). MMC § 10.05.0820.

C (Commercial)

  • Purpose: general commercial uses and mixed retail/office. MMC § 10.05.1000 (overview; see below).
  • Typical permitted uses: a broad range of retail, restaurants, services — consult the land‑use table in MMC § 10.05.0410 for parcel‑by‑parcel permissions.
  • Key standards: minimum lot width 25 ft, min lot area 2,500 sq ft, lot coverage 100%, FAR no limit, height nominal max 40 ft with exception processes; setbacks generally none except 10 ft when adjacent to alley or R districts. MMC § 10.05.1020.
  • Parking: parking requirements are set in the city's parking table, MMC § 10.05.2100.

DTECRSP (Downtown & El Camino Real Specific Plan)

  • Purpose: implement the Downtown and El Camino Real Specific Plan emphasizing transit‑oriented, mixed‑use development. MMC § 10.05.1100.
  • Uses & standards: permitted/conditional uses and detailed development standards (setbacks, heights, FAR, parking) are controlled by the specific plan text and are incorporated by reference into the zoning code (MMC § 10.05.1120). Projects in DTECRSP must follow those plan standards rather than only the baseline district tables. MMC § 10.05.1120.

I (Industrial)

  • Purpose: maintain viable industrial/manufacturing and bulk wholesale uses away from non‑industrial uses. MMC § 10.05.1200.
  • Uses/standards: permitted industrial uses and development standards are set in Article XII (uses and standards are in §§ 10.05.1210–1220).

OS (Open Space)

  • Purpose: protect public open space and parks; passive and active recreation. MMC § 10.05.1400.
  • Uses: open space, parks, limited conditional wireless facilities. MMC § 10.05.1410.
  • Standards: development standards set on a case‑by‑case basis for each project (§ 10.05.1420).

PF (Public Facilities)

  • Purpose and uses: government operations, community/educational facilities, and related supporting structures; accessory parking lots/structures allowed. MMC § 10.05.1310–1320.

PD (Planned Development)

  • Purpose: allow site‑specific, plan‑driven development with a two‑stage PD process (conceptual development plan + precise development plan). MMC §§ 10.05.1500–10.05.1550 (conceptual and precise plan requirements and findings). The PD zone is added by ordinance and recorded on the official zoning map once adopted.

MSAPD (Millbrae Station Area Planned Development)

  • Purpose: implement the Millbrae Station Area Specific Plan (MSASP) with area‑wide design and capacity rules; MSAPD incorporates the MSASP by reference. MMC § 10.05.1700–1705.
  • Uses & review: site uses must be consistent with the MSASP; new structures and exterior alterations require design review and usually a site development plan. MMC § 10.05.1710–1715.

-O (Office Combining District)

  • Purpose: allow office uses as a combining suffix on qualifying residential lots that abut commercial zoning and where the blockface transitions from residential to nonresidential. Initiation rules are in MMC § 10.05.0920; permitted office uses are conditional in MMC § 10.05.0910. Development standards defer to the underlying residential district. MMC §§ 10.05.0310, 10.05.0900–0930.

Quick reference table — common, decision‑relevant rules

Item Typical value / permitted use Code reference
Official zoning map governs district location Zoning Map incorporated by reference; official copy with City Clerk MMC § 10.05.0320
R-1 lot area / coverage / FAR 5,000 sq ft, 50% lot coverage, FAR 55% MMC § 10.05.0620
R-2 triplex lot area 7,500 sq ft for triplex lot MMC § 10.05.0720
R-1LL lot area 10,000 sq ft MMC § 10.05.0520
C district height & setbacks Max 40 ft (exceptions possible); no setbacks except 10 ft when adjacent to alley or an R district MMC § 10.05.1020
Parking standards See the off‑street parking table — 2 garage spaces per single‑family; multi‑family varies by unit size MMC § 10.05.2100
MSAPD rules Site development plan + design review; MSASP incorporated by reference MMC §§ 10.05.1700–1715
PD (Planned Development) Conceptual development plan + findings required; zone added by ordinance and shown on map MMC §§ 10.05.1520–1540

Checklist

An applicant should confirm the following before filing a project application:

  • Confirm zoning for the parcel on the official Zoning Map (City Clerk copy) and whether the lot crosses districts (MMC § 10.05.0320, 10.05.0330).
  • Confirm permitted vs. conditional uses in the district (consult MMC § 10.05.0410 land‑use table and the district use sections cited above).
  • Check development standards (lot minimums, coverage, FAR, height, setbacks) for the district (see the district §§ listed above and Millbrae Development Standards).
  • Verify off‑street parking requirements in MMC § 10.05.2100 and any special rules inside the MSASP/DTECRSP.
  • If in the MSAPD or DTECRSP, prepare a site development plan or comply with the specific plan standards and expect required design review. MMC §§ 10.05.1715, 10.05.1120.
  • For projects near SFO, do the Airport Land Use Compatibility consistency requirements set out in Article XVI (noise/clearance/avigation easements). MMC § 10.05.1600 et seq.
  • If seeking a PD or zone change, prepare a conceptual development plan and the findings required by MMC § 10.05.1520–1540; expect an ordinance and map amendment if approved.

Risks & Ambiguities

Issue Why it matters What to verify
Ambiguous district boundaries Map-based boundaries can split parcels; use the ordinance fallback rules Confirm official map sheet and apply MMC § 10.05.0330 (nearest recorded property line / more restrictive rule applies).
Combining -O initiation & scope The -O district is only available where specific blockface criteria are met Verify the lot abuts commercial zoning and the blockface transition per MMC § 10.05.0920 before assuming office uses are possible.
Specific plans vs. base district rules (DTECRSP / MSAPD) Specific plan standards or MSASP may override base district tables for parking, FAR, heights Confirm whether the property is in DTECRSP or MSAPD and use the specific plan text; MMC §§ 10.05.1120, 10.05.1705.
Airport compatibility and height SFO‑area requirements may limit height and require disclosures Verify airport ALUCP consistency and any avigation/airspace evaluations under MMC Article XVI.
Planned Development expectations PD approvals are ordinance‑level and include conceptual and precise plan steps — standards can be project‑specific Verify required findings and the conceptual plan content per MMC §§ 10.05.1520–1540; check that any PD zone change will appear on the official map once adopted.
Parcel‑specific program eligibility (e.g., urban lot splits, two‑unit ministerial review) State laws (e.g., Gov Code 66411.7 / 65852.21) interact with local code; local qualifying criteria apply For urban lot splits and ministerial two‑unit approvals, verify local qualifying criteria in MMC §§ 10.05.3530 and 10.05.3540.

Plain‑English Summary

Millbrae's zoning divides the city into named districts (R‑1LL, R‑1, R‑2, R‑3, C, DTECRSP, I, OS, PF, PD, MSAPD, and the -O combining district). Each district lists allowed uses and concrete development standards (lot size, lot coverage, FAR, setbacks, height). The official zoning map and the specific plan texts (for downtown and the station area) control where those rules apply and which standard takes precedence; boundary issues and airport compatibility are two common things to check first. MMC §§ 10.05.0300–10.05.0340; district articles as cited above.

Source References

Sources

Retrieved passages

  • Millbrae Zoning Code (§ 10.05.0320.) High relevance
  • Millbrae Zoning Code (§ 7800) High relevance
  • Millbrae Zoning Code (§ 6) High relevance
  • Millbrae Zoning Code (Article XVI) High relevance
  • Millbrae Zoning Code (Title 10) High relevance
  • Millbrae Zoning Code (§ 7600) High relevance
  • Millbrae Zoning Code (Article XVI) High relevance
  • Millbrae Zoning Code (§ 7906) High relevance
  • Millbrae Zoning Code (§ 10.05.0500.) High relevance
  • Millbrae Zoning Code (§ 6) High relevance
  • Millbrae Zoning Code (§ 14) High relevance
  • Millbrae Zoning Code (section can) High relevance
  • Millbrae Zoning Code (article establishes) High relevance

Cited sections

Frequently asked questions

What can I build on an R-1 lot in Millbrae?

On an R-1 lot you may build a single‑family dwelling and related accessory uses such as ADUs/JADUs, home occupations and short‑term rentals where allowed; other uses such as schools or places of worship are conditional. See MMC § 10.05.0610 and the land‑use table, MMC § 10.05.0410.

What are Millbrae setback requirements for commercial buildings?

The C district generally has no front/side/rear yard setbacks, except where the lot is adjacent to an alley or any residential ("R") district, in which case a 10‑foot setback applies; there are additional provisions on garage setbacks. See MMC § 10.05.1020.

Does Millbrae require design review for station-area projects?

Yes. Projects in the MSAPD that involve new structures or exterior alterations require design review and submission of a site development plan consistent with the Millbrae Station Area Specific Plan. See MMC §§ 10.05.1710–1715.

Where is the official Millbrae zoning map and how are boundaries resolved if unclear?

The official map (the "Zoning Map of the City of Millbrae") is incorporated into the code and an official copy is kept by the City Clerk; if boundaries cannot be readily ascertained, the ordinance treats the boundary as the nearest legally recorded property line, and split lots default to the more restrictive district. See MMC §§ 10.05.0320–0330.

Can I add an ADU in Millbrae and which code section governs that?

Accessory dwelling units are listed as accessory uses in the residential districts (for example both R‑1LL and R‑1 list ADUs/JADUs as accessory uses). Local ADU process details are in the city's ADU guidance and MMC district use sections; the ordinance shows ADUs are allowed as accessory uses in residential districts (MMC §§ 10.05.0510, 10.05.0610). Verify state ADU law interactions via the state's ADU rules.

What minimum parking is required for single‑family homes?

Millbrae requires two garage parking spaces per single‑family dwelling as the baseline; parking specifics and any exceptions are in the off‑street parking table (MMC § 10.05.2100) and district text (see R‑1LL/R‑1 clauses).

If my lot straddles two districts which rules govern my project?

If a lot is split by a district boundary the ordinance deems the entire lot to be within the more restrictive district; also confirm boundary rules in MMC § 10.05.0330 and consider a rezoning or map amendment if necessary.

How does the PD (Planned Development) process work in Millbrae?

A PD rezoning begins with a conceptual development plan submitted for approval and adoption by ordinance; if approved, the PD zone is shown on the official map. A subsequent precise development plan and design review are required before development proceeds. See MMC §§ 10.05.1520–1540.

Do I need to check airport compatibility for a new building in Millbrae?

Yes — many district sections (C, R neighborhoods, MSAPD, etc.) require compliance with the Airport Land Use Compatibility Plan (ALUCP) and associated disclosures and evaluations under MMC Article XVI (e.g., noise, avigation easements, safety). Check MMC § 10.05.1600 and the specific district ALUCP references.

Are there ministerial two‑unit or urban lot split programs in Millbrae?

Millbrae has ministerial paths for urban lot splits and for two‑unit residential development in R‑1LL and R‑1 where state law allows (local qualifying criteria apply); see MMC §§ 10.05.3530 (urban lot splits) and 10.05.3540 (two‑unit development). Verify parcel‑specific eligibility before filing. ---

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