Local zoning · Belmont

Belmont — Development Standards

Development Standards under the Belmont local zoning and planning code, with the controlling citations.

Last reviewed: July 1, 2026

Overview

This page distills the development standards in Belmont’s zoning ordinance (commonly codified as Title 17, Zoning) into plain-English, district-by-district guidance. It focuses on dimensional controls like setbacks, height, lot coverage/intensity, density, and floor area rules that shape what can be built under Belmont zoning. For a big-picture map of districts and how these standards fit into approvals, start with the Belmont Zoning and Belmont Land Use pages.

How Belmont writes “development standards”

Across districts, Belmont uses a mix of:

Minimum lot size and lot dimensions (frontage and width) standards.
Setbacks and height limits, sometimes with special stepbacks/daylight planes near homes.
Floor area controls via FAR or district GFA tables (especially in single-family and hillside districts).
Density caps in multi-family districts, and in plan areas via specific-plan tables.
Objective site features like landscaping percentages and on‑site pedestrian connections in mixed‑use/commercial areas. These are district-specific and often layered by area plans or overlays such as the Hillside Residential and Open Space (HRO) districts; see Belmont Overlay Districts.

Single-Family Residential Districts

R-1A — Single-Family Residential

Purpose and uses: Primarily single-family homes with typical residential accessories; one accessory dwelling unit is allowed per lot (citywide ADU rules live on the Belmont ADUs page). Height is limited to a primary structure of 28 ft and accessory structures of 15 ft .
Key dimensional standards:
- Minimum lot area: 9,600 sf; minimum width 70 ft; frontage 50 ft for new lots .
- Front yard: 15 ft on 50‑ft ROW or 20 ft on 40‑ft ROW; 25 ft from private road/easement line; 18‑ft garage driveway depth on site; side yard: 10% of lot width (min 6 ft, max 9 ft); rear yard: 20 ft .
- Larger homes (GFA > 3,500 sf) must meet “Table 6” larger setbacks: front 20/25 ft (by ROW), side 15% lot width or 10 ft (greater), street side 20 ft; rear 25 ft .
- Floor area: The lesser of slope‑based FAR from Table 4 or lot‑size GFA from Table 5 (3,500 sf up to 10,000 sf, then +0.15 per sf above 10,000 to a 4,500 sf cap) unless a floor area exception is approved; see §4.2.3(d) and Tables 4–5 .
Where it applies: Parcels mapped R‑1A on the zoning map; verify specific lots with the City.

R-1B — Single-Family Residential

Purpose and uses: Single-family with the same height framework (28 ft/15 ft) .
Key dimensional standards:
- Minimum lot area: 6,000 sf; width 60 ft; frontage 50 ft for new lots .
- Front 15/20 ft by ROW, side 10% (6–9 ft), rear 15 ft; larger-home setbacks use the same Table 6 rules for R‑1B/C as above .
- Floor area: Tables 4–5 method (≤3,500 sf up to 10,000 sf lot; then sliding increase to 4,500 sf) .

R-1C — Single-Family Residential

Purpose and uses: Single-family; same basic height/ADU allowances .
Key dimensional standards:
- Minimum lot area: 5,000 sf; width 50 ft; frontage 50 ft for new lots .
- Front 15/20 ft by ROW, side 10% (6–9 ft), rear 15 ft; Table 6 larger‑home setbacks apply as for R‑1B .
- Floor area: Tables 4–5 method (≤3,500 sf up to 10,000 sf lot; then sliding increase to 4,500 sf) .

R-1E — Single-Family Residential (Estate)

Purpose and uses: Larger‑lot single‑family; height 28 ft/15 ft .
Key dimensional standards:
- Lot area: 1 acre minimum; width 150 ft; front 25 ft; side 15 ft (25 ft on street side of corner); rear 30 ft .
- Floor area: Tables 4–5 method (R‑1E/H lots may reach 4,500 sf per Table 5) .

R-1H — Single-Family Residential (Hillside)

Purpose and uses: Single-family on larger, sloped lots; height 28 ft/15 ft .
Key dimensional standards: Lot area 20,000 sf; width 100 ft; front 25 ft; side 10% (6–9 ft cap); rear 30 ft; GFA per Tables 4–5 (R‑1H lots may reach 4,500 sf) .

Notes for all R‑1 districts:

Accessory structures can be within 5 ft of a rear lot line; accessory side-yards vary by lot/corner status (see §4.2.5–4.2.6) .
Slope‑based FAR table (Table 4) runs from about 0.533 at 0–10% slope down to 0.267 at 45%+ slope; use with the lot-size GFA table, and apply the lesser, per §4.2.3(d) .

Two‑Family and Multi‑Family Residential Districts

R-2 — Two-Family Residential

Purpose and uses: One duplex or a single‑family + ADU per lot; same basic setbacks as R‑1C via cross‑reference; typical small‑scale multi‑unit form .
Key dimensional standards:
- FAR: 0.60; height: 2 stories or 35 ft; yards: apply R‑1C front/side/rear yard rules (see §4.3.3–4.3.4) .

R-3 — Multi-Family Residential

Purpose and uses: Low‑rise apartments/condos.
Key dimensional standards:
- Minimum lot area per unit: 1,950 sf + 250 sf per bedroom; site minimum 6,000 sf; FAR: 0.85; height: 2 stories or 35 ft .
- Setbacks: Front 15 ft; sides 6 ft on each side for 1–2 stories, with +2 ft per story above 2 (max 25 ft) (rear yard standard not shown in retrieved excerpt) .

R-4 — Multi-Family Residential (Medium-High Density)

Purpose and uses: Mid‑scale multi‑family.
Key dimensional standards:
- Minimum lot area: greater of 6,000 sf, or 750 sf for first unit + 1,450 sf per additional unit + 125 sf per bedroom; FAR: 1.4; height: 50 ft; yards: apply R‑3 yard standards (§4.4.4) .

R-5 — High‑Density Multi‑Family Residential

Purpose and uses: High‑density apartments; R‑1/2/3/4 permitted uses carry over; additional conditional uses include taller multi‑family buildings subject to permit findings.
Key dimensional standards:
- Minimum lot area: greater of 7,200 sf, or 1,000 sf per unit + 100 sf per bedroom; FAR: 3.5; height: up to 50 ft (+8 ft for specific non‑habitable features) .
- Setbacks: Front same as R‑3; typical side minimum 6 ft (with +1 ft per story above 2, up to 20 ft); rear 15 ft for habitable portions (10 ft for non‑habitable), with additional increases for buildings over three stories (details in §4.6.4) .

Hillside Residential and Open Space (HRO) Districts

The HRO districts apply to Belmont’s hills, including San Juan Hills and Western Hills, with purpose to reduce density and grading on steep slopes, regulate home size, and cluster units where appropriate (§4.7.1) .

Common HRO standards (unless otherwise specified):

Setbacks: front 15 ft; rear 15 ft; sides 7 ft; accessory yards 18 ft front, 7 ft side/rear; townhouse yards by CUP in HRO‑3 (§4.7.5) .
Height: primary 28 ft; accessory 15 ft (§4.7.6) .
Parking: see §8 and §24 and our Belmont Parking page.

HRO‑1

Purpose and uses: Larger single‑family lots; clustering may be approved to reduce grading and preserve open space (§4.7.10(c)) .
Key dimensional standards:
- Floor area cap: 4,500 sf on parcels ≥20,000 sf or on clustered projects averaging ≥20,000 sf; 3,500 sf on other lots (§4.7.10(b)) .
- Clustering CUP findings and open space requirements apply (§4.7.10(c)) .

HRO‑2

Purpose and uses: Single‑family with slope‑based floor area limits; density/floor area transfers may be permitted along the same roadway within defined subareas (§4.7.11, §4.7.11(e)) .
Key dimensional standards:
- FAR is slope‑based (Table 2), with per‑lot cap of 3,500 sf and a sliding minimum floor area for steep lots; e.g., FAR 0.350 at 1–10% slope, tapering to 0.026 at 45%+ (§4.7.11(b), Table 2) .

HRO‑3

Purpose and uses: Single‑family and, in places, townhouses via clustering CUP; standards tailored for Western Hills (§4.7.12) .
Key dimensional standards:
- Floor area: 3,500 sf for single‑family (3,750 sf with 3‑car garage); 2,500 sf average for townhouses; 2,500 sf for substandard lots or >45% slope lots (§4.7.12(b)) .
- Clustering: Minimum lot sizes, open space easements, and townhouse private-yard minimums set through CUP (§4.7.12(c)) .

Commercial, Mixed‑Use, and Public Districts

CMU — Corridor Mixed Use District (Specific Plan §5A)

Purpose and uses: Corridor mixed‑use areas with shopfronts and housing; objective design features apply; see Belmont Design Review.
Key dimensional standards:
- Residential density: No maximum (§5A.1.7) .
- Height: 50 ft base; hotels up to 65 ft; up to 60 ft with community benefits bonus; +8 ft for limited non‑habitable features (§5A.1.11) .
- Setbacks: 10 ft where abutting R‑1; none elsewhere; 5‑ft upper‑story stepback (3rd story and above) along side/rear abutting R‑1 (§5A.1.12) .
- Site: Minimum lot size 7,200 sf; width 60 ft; minimum ground‑floor height 16 ft (non‑res) / 10 ft (res) (§5A.1.12) .
- Bonuses: City Council may award additional FAR/height/density for specified community benefits (§5A.2.2–.2.3) .

5B Districts — Belmont Village (Specific Plan §5B)

Purpose and uses: Belmont Village mixed‑use districts with pedestrian‑oriented design (two districts under Section 5B).
Key dimensional standards:
- Height: Up to 65 ft in both §5B.1 and §5B.2 districts; daylight-plane control within 50 ft of abutting residential, and special height measurement rules on sloped sites (§5B.2.10) .
- Setbacks: None, except provide interior setbacks equal to abutting residential district where sharing an interior lot line (§5B.1.11, §5B.2.11) .
- Site: Minimum lot 7,200 sf; width 60 ft; landscaping minimums and required on‑site pedestrian walkway connections apply (§5B.1.9, §5B.1.11(d)) .

Downtown Specific Plan Area (Section 5.3)

Purpose and uses: Standards within the Downtown Plan’s mapped area; project‑specific height/bulk follow plan figures; see §5.3.14–5.3.18 .
Key dimensional standards:
- Residential density: 30 units/net ac; FAR: 1.0; min lot 7,200 sf; setbacks: front 15 ft; side 6 ft plus +2 ft per story above two; rear 15 ft (§5.3.18) .

RC — Regional Commercial District (Section 5.4)

Purpose and uses: Community/visitor‑serving retail, auto‑oriented uses, offices, with compatibility standards (§5.4.1) .
Key dimensional standards:
- FAR: 1.8; height: 55 ft; setbacks: none, except match abutting residential interior setbacks; minimum lot: 7,200 sf; width 60 ft; transitional yards per §9.7.5; landscaping 10–15% depending on scope (§5.4.6–5.4.11) .

E‑1 — “E‑1” Executive/Office District (Section 5.6)

Purpose and uses: Office and related uses (full permitted-use list is in §5.6; not fully shown in retrieved excerpts). Design Review required.
Key dimensional standards:
- Setbacks: front 15 ft; side 6 ft (7.5 ft on longer street side of corners); rear 10 ft; FAR: 1.5; height: 2 stories or 35 ft (§5.6.5–5.6.7) .

E‑2.1 and E‑2.2 — Executive Administrative Districts (Section 5.7)

Purpose and uses: Administrative/professional offices, labs of a research nature; specified conditionally permitted uses (§5.7.1–5.7.2) .
Key dimensional standards:
- Minimum site: 10,000 sf; average width 100 ft; frontage 40 ft; FAR: 0.45; height: 28 ft (§5.7.3) .

PS — Public and Semi‑Public District (Section 5C)

Purpose and uses: Parks, civic buildings, schools (public schools are exempt from Design Review) (§5C.1–5C.5) .
Key dimensional standards:
- No FAR cap; no minimum lot size; height: 45 ft (more allowed by PC if impacts are acceptable); setbacks: none, except match abutting residential along shared lines; landscaping: at least 20% of site (§5C.6–5C.7) .

PD — Planned Development District (Section 12)

Purpose and uses: Custom, master‑planned sites where specific “Detailed Development Plan” sets the binding standards after public review.
Key dimensional standards: The PD plan will establish minimum lot size/dimensions, maximum site coverage, minimum yards, maximum building heights, fence/wall heights, signs, and parking; open space and density must substantially conform to the General Plan (§12.6–12.8) .

Decision‑relevant standards at a glance

District	Core Intensity/Height	Setbacks (typical)	Notes
R‑1A	GFA per Tables 4–5; 28 ft height	Front 15/20; Side 10% (6–9 ft); Rear 20; larger homes use Table 6	18‑ft driveway to garage; 25‑ft from private road/easement line
R‑1B	GFA per Tables 4–5; 28 ft height	Front 15/20; Side 10% (6–9 ft); Rear 15; Table 6 for larger homes
R‑1C	GFA per Tables 4–5; 28 ft height	Front 15/20; Side 10% (6–9 ft); Rear 15; Table 6 for larger homes
R‑2	FAR 0.60; 35 ft height	Same yards as R‑1C	Duplexes or SF + ADU
R‑3	FAR 0.85; 35 ft height	Front 15; Side 6 ft +2 ft/story >2 (rear not found in excerpt)	Min lot area per unit: 1,950 + 250/bedroom
R‑4	FAR 1.4; 50 ft height	Uses R‑3 yard standards	Lot area formula per unit; mid‑scale multi‑family
R‑5	FAR 3.5; 50 ft height	Front as R‑3; Side 6 ft +1 ft/story >2; Rear 15 (10 non‑hab.)	High‑density; +8 ft for non‑hab. features
HRO‑1	3,500–4,500 sf cap; 28 ft height	Front/Rear 15; Side 7	Clustering by CUP
HRO‑2	FAR by slope (Table 2), ≤3,500 sf	Front/Rear 15; Side 7	Density/FAR transfer tools
HRO‑3	3,500–3,750 sf SF; 2,500 sf avg TH	Front/Rear 15; Side 7	Townhouses via CUP
CMU (5A)	No max res density; 50–65 ft height	10 ft and stepbacks when abutting R‑1; none elsewhere	Community‑benefit bonuses
5B districts	65 ft height	None; match abutting R setbacks on shared lines	Daylight‑plane next to homes
RC	FAR 1.8; 55 ft height	None; match abutting R setbacks	Transitional yards per §9.7.5
E‑1	FAR 1.5; 35 ft (2 stories)	Front 15; Side 6/7.5; Rear 10	Office/professional
E‑2	FAR 0.45; 28 ft	Site min 10,000 sf; width 100 ft; frontage 40 ft	Research/office
PS	No FAR cap; 45 ft (more by PC)	None; match abutting R where adjacent	Landscaping ≥20%

Practical note: Commercial/mixed‑use districts often add objective frontage transparency, entry orientation, pedestrian walkway, and landscape minimums—these are enforced through Belmont Design Review and Section‑specific standards (e.g., §5A.1.13; §5B.1.9–.12) .

Checklist

Confirm your base district on the zoning map and read its intensity, height, and yard rules in Title 17 (e.g., R‑1 Tables 4–5; R‑2 FAR 0.60; RC FAR 1.8) .
Screen for overlays/plan areas (e.g., HRO‑1/‑2/‑3, Downtown Specific Plan, CMU/Belmont Village) and apply those specific standards first; some plan districts allow bonuses with council approval .
Calculate maximum floor area or FAR correctly (slope table, lot‑size table, or stated FAR cap) and check any caps (e.g., 3,500–4,500 sf in R‑1/HRO, 0.85 FAR in R‑3) .
Apply the right front/side/rear setbacks and any larger‑home or stepback/daylight‑plane rules when near residential edges (e.g., Table 6 in R‑1; 5‑ft upper‑story stepback in CMU; 45‑degree daylight plane in §5B.2.10(d)) .
Confirm minimum lot size/width/frontage for subdivisions or lot line adjustments (e.g., R‑1 site width by subdistrict; E‑2 site minimums) .
Check required parking in §8/§24 and any frontage transparency/landscape/walkway standards in plan/mixed‑use districts .
Determine if Design Review is required (it applies broadly to new construction and exterior modifications in many districts) .
If you’re nonconforming, consult Belmont Nonconforming Uses and §9.6 before enlarging or rebuilding .
Coordinate signage with the Belmont Signage rules cited in each district.
If strict standards can’t be met due to unique conditions, explore Variances and Exceptions (where applicable).

Risks & Ambiguities

Issue	Why it matters	What to verify
Right‑of‑way width changes R‑1 front setbacks	R‑1A/B/C front setbacks are 15 ft on a 50‑ft ROW but 20 ft on a 40‑ft ROW; private roads add a 25‑ft rule	Confirm your street’s mapped ROW width and whether frontage is on a private road (§4.2.4)
Large R‑1 homes trigger bigger setbacks	Exceeding 3,500 sf in R‑1A/B/C invokes Table 6 setbacks	Check if GFA crosses 3,500 sf and apply Table 6; watch side‑yard formulas (§4.2.3(g), Table 6)
Slope affects house size	In R‑1 and HRO areas, slope reduces FAR and may change minimum floor area	Use the correct slope percent and corresponding FAR/minimums (Tables 4–5; HRO‑2 Table 2)
Mixed‑use next to homes	CMU/5B/RC require interior setbacks or stepbacks/daylight planes when abutting R districts	Confirm if your lot abuts an R district and apply the 10‑ft setback and 5‑ft upper‑story stepback (CMU) or daylight plane (5B); RC must match abutting R setbacks (§5A.1.12; §5B.2.10(d); §5.4.11)
Downtown Plan figures govern height/bulk	Heights/setbacks rely on mapped figures, not only text	Check the Downtown Specific Plan figures cited in §5.3.16–.18 for your site
Office districts vary widely	E‑1 vs. E‑2 standards differ (FAR 1.5 vs. 0.45; heights 35 ft vs. 28 ft)	Confirm the correct E district and apply §5.6 vs. §5.7 metrics
PD sites are custom	Standards are embedded in the approved PD plan	Read the PD’s Detailed Development Plan for setbacks/height/coverage and open space (§12.6–12.8)

Plain-English Summary

Belmont’s zoning sets the shape and size of projects through minimum lot sizes, setbacks, heights, and floor‑area or FAR caps that vary by district—and by slope in the hills. If you’re in a corridor or village plan area, expect urban standards (higher heights, minimal setbacks) with extra pedestrian and landscape requirements and, in CMU, potential height/FAR bonuses for community benefits. Always check overlay/plan rules first, then your base district, confirm parking and design review needs, and adjust if your site abuts homes.

Source References

R‑1 standards (site area/width/frontage; slope and lot-size GFA; setbacks; height): §4.2.3–4.2.6, Tables 4–6 .
R‑2 standards (FAR, height, yards): §4.3.3–4.3.4 .
R‑3 standards (lot area/unit, FAR, height, yards): §4.4.3–4.4.4 .
R‑4 standards: §4.5.3–4.5.7 .
R‑5 standards: §4.6.3–4.6.7 .
HRO districts purpose/standards: §4.7.1–4.7.13 (yards, height, FAR/density/cluster/transfer) .
CMU Corridor Mixed Use (5A): §5A.1.7 (density), §5A.1.11–.1.13 (height/site/design), §5A.2 (bonuses) .
Belmont Village districts (5B): §5B.1.9–.1.12; §5B.2.7–.2.11 (height, setbacks, daylight plane, landscaping/walkways) .
Downtown Specific Plan area: §5.3.14–.18 (height/bulk/landscaping/setbacks/density/FAR) .
RC Regional Commercial: §5.4.1, §5.4.6–.4.11 (FAR, height, setbacks, landscaping) .
E‑1, E‑2 executive/office districts: §5.6.5–.6.7; §5.7.1–.7.3 (setbacks, FAR, height, site mins) .
PS Public and Semi‑Public: §5C.1–5C.7 (height, FAR, landscaping, setbacks) .
PD Planned Development: §12.6–12.8 (custom setbacks/height/coverage/open space) .

Sources

Retrieved passages

Belmont Zoning Code (Section 12.4.) High relevance
Belmont Zoning Code (Section 12.4.) High relevance
Belmont Zoning Code (§12) High relevance
Belmont Zoning Code (Section 24) High relevance
Belmont Zoning Code (Section 5A.1.6) High relevance
Belmont Zoning Code (Section 13.3) High relevance
Belmont Zoning Code (Section 9.7.5.) High relevance
Belmont Zoning Code (§19) High relevance
Belmont Zoning Code (Section 4.7.9) High relevance
Belmont Zoning Code (SECTION 5C) High relevance
Belmont Zoning Code (Section 13.) High relevance
Belmont Zoning Code (section 9.6.3) High relevance
Belmont Zoning Code (Section 4.7.3) High relevance
Belmont Zoning Code (§18) High relevance
Belmont Zoning Code (Section 13) High relevance
Belmont Zoning Code (§36) High relevance
Belmont Zoning Code (Section 4.7.9) High relevance

Cited sections

Official Belmont code library

Frequently asked questions

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

A single-family home plus one accessory dwelling unit is allowed, with a maximum house height of 28 ft and accessory structures up to 15 ft. Your lot’s size and slope limit the gross floor area using Tables 4–5; larger homes over 3,500 sf in R‑1A/B/C must meet bigger setbacks in Table 6 (§4.2.3–4.2.6) .

What are the basic Belmont single-family setbacks?

Typical R‑1A/B/C: front 15 ft on 50‑ft ROW or 20 ft on 40‑ft ROW; sides 10% of lot width (6–9 ft cap); rear 15–20 ft depending on subdistrict. R‑1E/H front is 25 ft, sides 15% or fixed values as stated, and rear 30 ft (§4.2.4–4.2.6) .

How big can a hillside (HRO) home be?

In HRO‑1, homes are capped at 3,500–4,500 sf depending on lot size; in HRO‑2, allowable floor area is set by a slope‑based FAR table with a 3,500‑sf cap; in HRO‑3, single‑family homes are generally 3,500–3,750 sf, and townhouse averages are 2,500 sf (§4.7.10(b), §4.7.11(b), §4.7.12(b)) .

What are R-2 duplex standards?

R‑2 has a maximum FAR of 0.60 and a 35‑ft (two‑story) height limit. Yard requirements mirror the R‑1C standards (front/side/rear), so check §4.2.4–4.2.6 for the actual numbers (§4.3.3–4.3.4) .

What are the height and setback rules in Belmont’s corridor mixed-use areas (CMU)?

Base height is 50 ft (65 ft for hotels), with up to 60 ft via community‑benefit bonuses. Setbacks are 10 ft where abutting R‑1 districts (none elsewhere), plus a 5‑ft upper‑story stepback from the third story along abutting R‑1 sides/rears (§5A.1.11–.1.12; §5A.2) .

Do Belmont Village (5B) districts require setbacks?

Generally no, except where your interior lot line abuts a residential district—in that case you must match the abutting residential setbacks. Max height is 65 ft, with a daylight‑plane limit for walls within 50 ft of abutting residential lots (§5B.1.10–.1.11; §5B.2.10–.2.11) .

How intense can Regional Commercial (RC) development be?

The RC District allows up to 1.8 FAR and 55‑ft height, with no setbacks except where you share an interior lot line with a residential district (then you must match its interior setbacks). Transitional yards per §9.7.5 may also apply (§5.4.6–.4.11) .

Is there a maximum residential density downtown?

Yes—Downtown Specific Plan standards set a maximum of 30 units per net acre, FAR 1.0, and fixed setbacks (15‑ft front; 6‑ft sides plus +2 ft/story above two; 15‑ft rear). Heights follow mapped figures in the plan (§5.3.16–.3.18) .

Do I need Design Review for exterior changes?

Most new construction and exterior modifications in plan/mixed‑use and many commercial districts require Design Review under Section 13 (and section‑specific triggers). Check your district text (e.g., §5A.1.9; §5B.2.8; §5.3.14; §5.4.8) and see Belmont Design Review .

What if my building is nonconforming to today’s setbacks or height?

Nonconforming structures/uses have specific rules for continuation, rebuilding after damage, and timelines for discontinuance. Review §9.6 and our Belmont Nonconforming Uses page before planning expansions (§9.6.5–9.6.8) . ---

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