Local jurisdiction · Santa Clara County
Los Altos Zoning, Planning & Building Codes
What you can build in Los Altos depends on its local zoning and planning code, layered on the California Building Standards Code. Ask GoCodebook about any Los Altos address.
Key points
Last reviewed: July 3, 2026
Overview
Los Altos regulates land use and development through Title 14 — ZONING of the Los Altos Municipal Code; the Title establishes the rules, application types, and the map-based districts that control permitted uses and development standards citywide § 14.01.010 . This page orients you to how the code is structured, the city’s district families, where the major numerical standards live, the local permit/review paths, and how state housing laws (ADU/SB9) are folded into Los Altos practice.
How Los Altos's code is organized
- Title 14 is arranged into an administrative chapter and separate chapters for each zoning district and topic (for example, administration and application rules in § 14.01.010 and district lists in § 14.04.010) .
- Common, citywide development rules are consolidated in topic chapters (for example, the city uses a consolidated development-standards chapter referenced across districts as Chapter 14.66; see district chapters that say “as provided in Chapter 14.66”) Chapter 14.66 .
- Design review is in Chapter 14.77 (triggers, tiers, and decision authorities) § 14.77.020–§ 14.77.040 . For first-step guidance on how the zoning map and district rules apply to a specific parcel, consult the city’s zoning page and the individual district chapters (for example the R1 chapter or downtown chapters) via the Los Altos Zoning and Land Use menus.
Zoning district families (what the map actually uses)
The code’s official district list names each district and overlay; the full set includes single‑family, multiple‑family, a range of office and commercial districts, public facilities, planned districts and overlays — for example R1-10, R1-20, R1-40, R1-H, R1-S (overlay), R3-4.5, R3-5, OA / OA-1 / OA-4.5, CN, CD, CRS, CT, CD/R3, PCF, PUD, and the Loyola Corners Specific Plan Overlay (LCSPZ). See the code list in § 14.04.010 .
- Single‑family: the primary single‑family district is R1-10; permitted single‑family uses and accessory dwellings are spelled out in § 14.06.020 and related provisions § 14.06.010–.060 .
- Multifamily: several R3 variants exist — for example R3-4.5 has its own purpose and numeric limits (minimum site area, coverage and FAR) set in § 14.16.010–§ 14.16.060 (see, e.g., maximum coverage 60% and maximum FAR 55%) .
- Office / commercial and downtown: the OA, CN, CD, CT and related commercial districts carry tailored design and use goals; the downtown CD district’s purpose statements and pedestrian/down‑town-specific goals are in § 14.44.020 .
(When reading district chapters, watch for the repeated phrase “as provided in Chapter 14.66,” which means the district defers many standardized development rules to the central development standards chapter.) Chapter 14.66 .
Citywide development standards — where the numbers live and typical controls
- Setbacks / yards, coverage, FAR, unit density, minimum site area and other dimensional standards are specified in each district chapter and supplemented by Chapter 14.66 (the code’s common standards). District chapters will show the local numeric controls (for example, R1-10 site area and coverage limits are in § 14.06.040 and § 14.06.060; R1‑10 maximum coverage 35% for structures over 6' tall is in § 14.06.060) .
- Examples of district numeric rules:
- R3-4.5 — maximum site coverage 60% § 14.16.050; maximum floor area 55% § 14.16.060 .
- OA / OA-1 — OA site controls including maximum coverage 75% and density bands are in § 14.34.060–§ 14.34.065; minimum front yard 5 ft, minimum side 5 ft (or 25 ft abutting an R1‑10) and rear 15 ft (or 30 ft abutting an R1‑10) are shown in § 14.34.070–.090 .
- Parking requirements are collected in the parking chapter and are referenced directly from districts (see parking standards and the cross‑reference to Chapter 14.74 in district rules such as § 14.34.110) . For the city’s parking rate tables and rules, see Los Altos Parking.
- Design and site controls (landscaping, screening, bicycle parking, service area locations, maximum building‑wall lengths adjacent to R‑1) appear as objective standards in district chapters and in Chapter 14.66; see, for example, Section 14.66.280 and the CN/CD/R3 district design lists § 14.40. / § 14.52. .
- Signage, landscaping, nonconforming uses, and fences each have their own chapters (e.g., signage in Chapter 14.68, landscaping in Chapter 14.70, fences in Chapter 14.72 and nonconforming rules referenced throughout Chapter 14.66) — look up the cross‑references in the district chapter text.
If you want a one‑page view of the city’s dimensional and objective standards, consult the Los Altos Development Standards menu and the district chapter(s) that apply to your parcel.
Specific plans & overlays
- Los Altos explicitly recognizes specific plan and overlay districts on the zoning map. The city’s district list includes the Loyola Corners Specific Plan Overlay (LCSPZ) and the R1‑S Single‑Story overlay; the code instructs readers to consult the overlay chapter language for specific standards § 14.04.010 .
- District chapters will reference overlays and special plan requirements where applicable (for example, downtown chapters tie into the downtown urban design plan and allow certain exceptions for public benefit in § 14.52.160) . For a consolidated view of overlays, see Los Altos Overlay Districts.
Building permits & review: the practical permit path
- Administration: the development services director is the city’s zoning administrator and is the administrative point person for interpretations and many approvals § 14.01.020 .
- Ministerial versus discretionary applications are defined in Chapter 14.01; notice and hearing protocols are in § 14.01.130 (public notice rules) .
- Design review tiers: small/ministerial projects require administrative design review; more complex projects are heard by the zoning administrator or the planning commission, with specific triggers listed in Chapter 14.77 (for example, administrative design review triggers § 14.77.020, zoning‑administrator design review triggers § 14.77.030, and planning commission triggers § 14.77.040) .
- Use permits, variances and their processing:
- Use permits and extensions are handled under Chapter 14.80; modifications of use permits go to the planning commission per § 14.80.110 .
- Variances are governed by Chapter 14.81 and are available only for deviations from Title 14 standards (not for creating new uses) § 14.81.010–.020 .
- Building permits and occupancy: you must obtain required building permits and, where applicable, a certificate of occupancy; applications and issuance requirements are in Chapter 14.84 § 14.84.020–§ 14.84.030 .
- Appeals, notice and indemnity: municipal procedures for appeals and obligations (including an indemnity requirement for approvals) are in the administrative chapter § 14.01.100 and related provisions § 14.01.140 .
For design steps and the typical submittal checklist, start at the city’s Design Review page and confirm the chapter triggers listed in Chapter 14.77 .
State housing law in Los Altos — ADUs, SB 9 and related interactons
Los Altos implements state housing directives through local ordinance chapters that incorporate required state references and local objective standards.
ADUs (Accessory Dwelling Units)
- Los Altos’s ADU rules are in Chapter 14.14. The chapter affirms the city’s ADU intent and definitions § 14.14.010–.020, sets maximum numbers of ADUs/JADUs per lot § 14.14.050, and provides a design‑standard table and dimensional rules § 14.14.060 (e.g., maximum attached/detached sizes and minimum 4‑ft side/rear setbacks) .
- General ADU provisions: short‑term rentals are prohibited for ADUs, ADUs must meet building code standards, and ministerial ADU approval cannot be conditioned on correcting unrelated nonconforming zoning conditions — see § 14.14.090 (which also ties connection/impact fee rules to state Government Code references) § 14.14.090(E) .
- ADU parking and mechanical rules are codified (parking exceptions and required stalls are in § 14.14.100 and mechanical equipment rules in § 14.14.110) .
- For quick local ADU guidance see Los Altos ADUs. For state technical building standards affecting ADUs consult the California Building Standards Code.
SB 9 / “Dual Opportunity Developments” (ministerial duplex + lot split)
- Los Altos added a dedicated chapter implementing SB 9 as Chapter 14.64 - DUAL OPPORTUNITY DEVELOPMENTS. The chapter explicitly implements Government Code Section 65852.21 (two primary units) and Section 66411.7 (urban lot splits) and sets local eligibility and objective standards (see § 14.64.010 and § 14.64.020) . The chapter also lists objective development standards, owner‑occupancy affidavit rules for lot splits, and short‑term rental prohibitions for units created under the chapter § 14.64.040–.080 .
- New housing under Chapter 14.64 is exempt from certain design review triggers per Chapter 14.77 exemptions (see the design review exemptions list in § 14.77.050) .
Density bonus, rent control and other statewide programs
- Density‑bonus rules are typically applied under state law; Los Altos’s code references state law where relevant (for example, ADU fee treatment references Government Code sections). I did not find a local, standalone density‑bonus chapter text in the retrieved Title 14 materials; verify with the city if you expect a local density‑bonus implementation (Not found in retrieved materials — verify with the jurisdiction). The code does not contain municipal rent‑control language in Title 14 (Not found in retrieved materials — verify with the jurisdiction).
For how state housing statutes interact with the local code, consult both the city ADU chapter § 14.14.090 and the SB9 chapter § 14.64.010 , plus the California housing laws and California ADU law summaries.
Practical orientation — where to look first
- Is my use allowed? Start with the district chapter named in the zoning map (see § 14.04.010 for district names) and the permitted/conditional use lists in that district chapter § 14.04.010 .
- What numeric standards apply? Read the dimensional tables in the district chapter and the centralized standards in Chapter 14.66 (e.g., setbacks, coverage, FAR) Chapter 14.66 .
- Will I need design review? Check the triggers in Chapter 14.77 — small projects may be administrative, while larger or multiunit projects go to the zoning administrator or planning commission § 14.77.020–.040 .
- Do I need a building permit and occupancy? Yes—see application and issuance rules in Chapter 14.84 § 14.84.020–.030 .
- ADUs and SB9 projects: consult Chapter 14.14 and Chapter 14.64 respectively for local objective standards, timing, and ministerial rules § 14.14.010 and § 14.64.010 .
If you need a printable list of the city’s parking rates, signs, or design standards, the code references those topics in separate chapters (parking = Chapter 14.74; signs = Chapter 14.68; see district cross‑references) — start at Los Altos Parking and Los Altos Design Review.
Information Gaps / Verify with the city
- I did not find a dedicated local density‑bonus implementation chapter text in the retrieved Title 14 excerpts (verify with the Development Services Department). Not found in retrieved materials.
- Rent‑control or tenant‑protection ordinances are not present in the Title 14 excerpts provided (verify with the city clerk/municipal code online). Not found in retrieved materials.
Source References
- Title 14 — ZONING: Administrative structure and purpose § 14.01.010
- Zoning district list and map authority § 14.04.010
- R1‑10 single‑family rules (permitted uses, site area, coverage) § 14.06.020, § 14.06.040, § 14.06.060
- R3‑4.5 development standards (coverage, FAR, setbacks) § 14.16.050, § 14.16.060, § 14.16.080
- OA / OA‑1 district provisions and OA numeric limits § 14.36.010 and OA coverage/density § 14.34.060–.100
- Downtown/CD objectives and standards § 14.44.020
- Central development standards (cross‑referenced chapter) Chapter 14.66 (see e.g., § 14.66.280)
- Design review chapter and triggers § 14.77.020–.040
- ADU chapter and standards § 14.14.010, § 14.14.050, § 14.14.060, § 14.14.090, § 14.14.100
- SB9 implementation (Dual Opportunity Developments) § 14.64.010–.020
- Use permits, modifications and time extensions § 14.80.110 and related Chapter 14.80 procedural rules
- Certificates of occupancy and building permit application requirements § 14.84.020–.030
Where to read the Los Altos code
The Los Altos municipal and zoning code is published on American Legal Publishing — view the official Los Altos code library. That lets you read the ordinance section by section.
GoCodebook goes beyond browsing American Legal Publishing (see how they compare): it reads the Los Altos 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.
Who this affects
Frequently asked questions
What zoning districts does Los Altos have?
Los Altos lists the city’s zoning districts (single‑family, multiple‑family, commercial, office, planned unit, overlays, etc.) in the code; the official list is in § 14.04.010, which names districts such as R1‑10, R1‑20, R1‑40, R1‑H, R1‑S (overlay), R3‑4.5, OA / OA‑1 / OA‑4.5, CN, CD, CT, CRS, CD/R3, PCF, PUD, and the Loyola Corners Specific Plan Overlay (LCSPZ) § 14.04.010 .
Do I need a building permit to remodel in Los Altos?
Yes—work that constitutes construction, additions, or a change of occupancy requires the appropriate building and planning permits; certificate of occupancy application/issuance rules are in § 14.84.020–.030 . Certain small exterior changes may still trigger administrative design review under § 14.77.020 .
Does Los Altos require design review for new single‑family houses?
Design review depends on scale: many small projects get administrative review; a new two‑story single‑family dwelling or conversion to two stories requires zoning‑administrator review after a noticed meeting per § 14.77.030, while one‑story new houses under certain heights may be administrative under § 14.77.020 .
What are the basic R1‑10 standards (setbacks, coverage)?
R1‑10 rules are in the R1 chapter: minimum site area, frontage and dimensional tables are in § 14.06.040–.060; for example, maximum coverage for structures over six feet in height is 35% in R1‑10 § 14.06.060 .
Can I build an ADU in Los Altos and what limits apply?
ADU rules are in Chapter 14.14. The city allows ADUs and JADUs consistent with state law; the ADU table in § 14.14.060 sets maximum sizes and minimum setbacks (for example, attached/detached ADU sizes up to 1,200 sq ft in several configurations and minimum 4 ft side/rear setbacks) and general ADU provisions are in § 14.14.090 (ministerial approvals, fee and utility rules) .
Has Los Altos implemented SB 9 (two units + lot split)?
Yes — Los Altos adopted a SB 9 implementation chapter titled “Dual Opportunity Developments” as Chapter 14.64; the chapter implements Government Code 65852.21 and 66411.7 with local objective standards and eligibility rules in § 14.64.010–.020 .
Where are parking requirements stated for projects in Los Altos?
District chapters reference the parking chapter; parking rates and exceptions are implemented via Chapter 14.74 and district cross‑references (for example, § 14.34.110 references Chapter 14.74 for OA parking) § 14.34.110 .
Can Los Altos require correction of unrelated nonconforming issues before issuing an ADU permit?
No—Chapter 14.14 states ministerial approval of an ADU shall not be conditioned on the correction of pre‑existing nonconforming zoning conditions; see § 14.14.090(G) .
Does Los Altos have local rent control?
No rent‑control provisions were found in the Title 14 excerpts examined; that topic would typically appear elsewhere in the municipal code if adopted (Not found in retrieved materials — verify with the city) Not found in retrieved materials.
How do I appeal a planning commission or zoning administrator decision?
Appeal rules and timelines are in the administrative chapter and the applicable decision sections (for example, appeals of planning commission decisions and zoning administrator decisions are governed under § 14.01.100 and decision‑specific appeal rules referenced in design review and use permit chapters) § 14.01.100 .
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