Local zoning · Monte Sereno

Monte Sereno — Historic Preservation

Q: Will a wireless company be able to install an antenna on my historic property without public review?

No — the ordinance requires a Conditional Use Permit for personal wireless facilities located on sites the City recognizes as historically significant, so those installations are treated as discretionary projects under § 10.09.050 .

Q: Do conservation or scenic corridor overlays change how historic properties are treated?

Yes — the Conservation Zone and Saratoga‑Los Gatos / Quito Road Scenic Corridor rules impose additional setbacks, tree and creek protections, and architectural review for visible structures; those rules can materially affect the setting of a historic property ( § 10.05.060–070 ).

Historic Preservation under the Monte Sereno local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

Monte Sereno does not have a separate, standalone "historic preservation" chapter in the retrieved zoning/planning ordinance. Historic resources are referenced within other chapters—most notably the floodplain, personal wireless facilities, site development/design review, and conservation/scenic corridor rules. Where the Code recognizes a historic structure it uses the federal/state/local inventory definitions and gives narrow, targeted allowances (for example, floodplain variances and permit status for wireless facilities). See § 10.21.050, § 10.08.040, and § 10.09.050 for the primary controls cited below.

Note: this page explains only what the Monte Sereno zoning/planning ordinance (Title 10 in the retrieved materials) says about historic preservation. For building-code (Title 24) or state historic practice obligations see the California Building Standards Code and state resources (linked below).

What the Code actually provides (synthesis)

Definition: The ordinance adopts the Secretary of the Interior / National Register–style definition of historic structure. A qualifying structure is one listed or preliminarily determined eligible for the National Register, or listed on a state or local inventory recognized by the Secretary of the Interior. See § 10.21.050.
Design review / permits: Projects that meet the thresholds for a Site Development Permit or other discretionary permits are reviewed by the City’s Site and Architectural Commission, whose stated purpose includes reviewing and regulating aesthetic and site/architectural aspects of projects (this is the principal local review body where historic/resource concerns will be considered). See § 10.08.010 and § 10.08.040.
Conservation / scenic corridors: Properties inside the Conservation Zone, Saratoga‑Los Gatos Scenic Highway Corridor, or Quito Road Scenic Corridor are subject to additional restrictions and architectural review when projects are visible from the corridors; these provisions are relevant where historic character relies on setting or streetscape. See § 10.05.060 and § 10.05.070.
Floodplain variances for historic resources: The floodplain chapter authorizes narrow variances for the repair or rehabilitation of a historic structure where the work will not preclude the building’s continued designation as historic and the variance is the minimum necessary to preserve historic character. See § 10.21.230 and related variance criteria § 10.21.240.
Special-case treatment for utilities/wireless on historic sites: Personal wireless service facilities located on sites the City recognizes as having historical significance require a Conditional Use Permit (i.e., discretionary review), even where other installations might receive ministerial clearance. See § 10.09.050.
Nonconforming and maintenance: Ordinary maintenance of nonconforming structures (including historic properties that are nonconforming) is allowed but expansions of pre-existing nonconforming elements are limited; reconstruction after damage has special triggers (see § 10.07.070). Verify whether a historic building is nonconforming; that status affects options.
No explicit local landmark/district program located in retrieved materials: The Code references local/state/federal inventories but does not show a Monte Sereno procedure for local landmark designation or a municipal historic district in the files retrieved. Not found in retrieved materials. (See "Information Gaps" below.)

District-by-district breakdown (where historic rules intersect)

The Monte Sereno ordinance uses residential base districts and special zones that affect historic/resource review. The Code uses discrete zoning labels; where the ordinance references a particular district it is explicit. Below I list the districts/zones that appear in the ordinance and how historic/resource review interacts with each.

R-1-8

Purpose: single‑family residential at smaller lot sizes; design and neighborhood character considerations are enforced through Site Development Permit and Site & Architectural Commission review. See § 10.08.010 and permit triggers in § 10.08.040.
Typical permitted uses: single‑family dwellings and accessory structures (subject to zoning rules). Not a separate historic district, but historic property within R-1-8 still uses the floodplain and conservation/scenic rules where applicable.
Key dimensional standards: Not found in retrieved materials for specific setbacks/lot coverage — verify in the City’s Development Standards. Not found in retrieved materials. See the city's Development Standards link for numbers. (/us/california/monte-sereno/development-standards)
Where it applies: City neighborhoods zoned R-1-8; review thresholds for additions and second‑story work are set out in § 10.08.040 (which triggers design review).

R-1-20

Purpose: larger-lot single‑family residential district; same design-review mechanisms apply.
Typical permitted uses: single‑family dwellings and accessory uses, subject to the Code.
Key dimensional standards: Not found in retrieved materials; consult Development Standards. Not found in retrieved materials.
Where it applies: Applies to lots that carry the R-1-20 map designation; additions above thresholds require a Site Development Permit per § 10.08.040.

R-1-44

Purpose: very large lot residential; emphasis on minimizing structural intrusion in conservation areas.
Typical permitted uses: single‑family dwellings and accessory uses with stricter lot conditions in conservation areas.
Key dimensional standards: Not found in retrieved materials; see Development Standards. Not found in retrieved materials.
Where it applies: Applies to large‑lot residential neighborhoods; second‑story/addition thresholds differ in the Code and trigger Site Development Permit review per § 10.08.040.

Conservation Zone (overlay)

Purpose: protect natural environment features—woodlands, riparian areas, slopes—and minimize structural intrusion. See § 10.05.060.
Typical permitted uses: residential (with tighter site/lots rules), with no commercial uses unless explicitly rezoned. Trees, creeks and other natural features shall be protected (explicitly listed in § 10.05.060).
Key standards that affect historic resources: minimum building site size, slope limits, limits on culverting creeks and required setbacks tied to natural features (see § 10.05.060). These affect historic properties whose character depends on landscape or view corridors.
Where it applies: areas mapped as Conservation Zone on the City’s zoning map. See Overlay Districts link for map context. (/us/california/monte-sereno/overlay-districts)

Scenic Corridors: Saratoga‑Los Gatos Scenic Highway Corridor and Quito Road Scenic Corridor

Purpose: protect scenic corridor character and require architectural review for structures or fences visible from the corridors. See § 10.05.070.
Typical effects on historic properties: architectural review for visibility, prohibition on certain vegetation removals without replanting, and extra setbacks — these affect historic streetscape and setting. See § 10.05.070.

Notes on Review Bodies and Process:

The Site and Architectural Commission handles aesthetic/site review and issues Site Development Permits as required; its purpose explicitly includes regulating architectural aspects of sites and structures (§ 10.08.010).
Where a project requires multiple approvals (CUP, variance, tree removal, etc.) the Commission’s action is often a recommendation to the City Council (concurrent review provisions). See § 10.08.055 and appeals § 10.08.060.

Quick reference table (decision‑relevant items)

Topic / Decision trigger	What it means for historic resources	Code reference
Definition of historic structure	Uses National/State/local inventory criteria for qualification	§ 10.21.050
Site Development Permit triggers	New main house or additions above thresholds require design review (where historic issues are raised)	§ 10.08.040
Wireless facilities on historic sites	Wireless installations on historically significant sites require a Conditional Use Permit	§ 10.09.050
Floodplain variances for historic buildings	Narrow variance allowed to preserve historic character where repair/rehab would preclude designation otherwise	§ 10.21.230 / § 10.21.240
Conservation / Scenic Corridor rules	Additional review, setbacks, tree/vegetation protections that affect setting/landscape of historic resources	§ 10.05.060 / § 10.05.070

Checklist (what an applicant must satisfy to move forward)

Determine whether the building qualifies as a historic structure under § 10.21.050; gather listing or eligibility documentation (National/State/local inventory).
Check if the project triggers a Site Development Permit (new main house; additions above the square‑foot thresholds; roof height increases; second‑story additions) per § 10.08.040 — if yes, prepare for Site & Architectural Commission review.
If the property is within the Conservation Zone or visible from the Saratoga‑Los Gatos Scenic Highway Corridor / Quito Road Scenic Corridor, identify applicable setbacks, creek protections and tree rules under § 10.05.060 / § 10.05.070.
For repairs/rehab in a floodplain, evaluate whether a variance per § 10.21.230–240 is necessary and whether the alteration would preclude continued historic designation.
If proposing wireless or antenna work on a recognized historic site, plan for a Conditional Use Permit per § 10.09.050.
Confirm whether the property is nonconforming and, if so, observe limits on expansion/repair under § 10.07.070.
Consult the City Planner / submit plans with elevations, landscape, and materials showing how historic character will be preserved; be prepared for public notice and hearings where discretionary permits are involved (see concurrent review & appeal rules § 10.08.055–060).

Risks & Ambiguities

Issue	Why it matters	What to verify
No local landmark or local historic‑district procedure found	Without a local designation program, protection and review options are limited to cross‑references in other chapters (flood, wireless, conservation)	Verify with the City Clerk or Planning Department whether a local historic ordinance or inventory exists beyond the retrieved Code. Not found in retrieved materials.
Exact dimensional standards (setbacks, lot coverage) for R‑districts	Design review outcomes depend on measurable standards not found in the retrieved excerpts	Verify Development Standards tables/maps in Chapter 10.05 or separate Development Standards document. Not found in retrieved materials. (/us/california/monte-sereno/development-standards)
Whether historic resources get objective design guidelines or special expedited review	State ADU law and building code allow some special rules for historic resources; local ordinance does not show explicit historic design guidelines	Verify whether City has adopted objective historic design standards or a Historic Preservation Element beyond what was retrieved. Not found in retrieved materials.
Interaction with ADU rules on historic properties	ADU state law permits protections for historic resources but local objective standards must be checked	Verify applicable ADU standards and how they treat historic properties per local ADU ordinance and State ADU law. (/us/california/monte-sereno/adu)
Floodplain vs. preservation conflicts	Floodplain variance rules allow narrow relief for historic structures but impose strict minimum‑necessary tests	Confirm floodplain mapping, base flood elevation, and whether the subject building is in an area of special flood hazard before relying on variance allowances (§ 10.21.150—170; § 10.21.230—240).

Information Gaps

Local Monte Sereno procedure for local landmark designation or a municipal historic register: Not found in retrieved materials.
Specific mapping or list of Monte Sereno properties the City recognizes as “historically significant”: Not found in retrieved materials.
Detailed dimensional tables (setbacks, lot coverage, FAR) for R-1-8, R-1-20, R-1-44 in the extracts provided: Not found in retrieved materials — check Chapter 10.05 / Development Standards. (/us/california/monte-sereno/development-standards)
Any adopted local historic design guidelines or a preservation ordinance: Not found in retrieved materials.

Plain-English Summary

Monte Sereno’s zoning code treats historic resources through existing chapters: the floodplain rules define what a historic structure is and allow narrow variances to preserve them (§ 10.21.050, § 10.21.230–240), the Site & Architectural Commission handles architectural/design review and will evaluate projects affecting historic character (§ 10.08.010, § 10.08.040), and special overlays (Conservation Zone and Scenic Corridors) impose protections on landscape and visibility that matter for historic settings (§ 10.05.060–070). The Code does not include an express local landmark/district program in the retrieved materials—verify with the City.

Source References

Monte Sereno Municipal Code — definition of historic structure, floodplain provisions and variance allowances: § 10.21.050, § 10.21.130–240.
Site Development Permits; Site & Architectural Commission (purpose and permit triggers): § 10.08.010, § 10.08.040, § 10.08.055–060.
Conservation Zone & Scenic Corridor controls: § 10.05.060–070.
Personal Wireless Service facilities (historic‑site CUP requirement): § 10.09.050.
Nonconforming structures and maintenance: § 10.07.070.
For state ADU / historic interactions and building-code historic provisions see the California ADU handbook and California Building Standards Code (state references included in the retrieved materials).

Related internal pages (useful next steps):

Monte Sereno zoning & planning overview (/us/california/monte-sereno)
Monte Sereno Zoning (/us/california/monte-sereno/zoning)
Monte Sereno Development Standards (/us/california/monte-sereno/development-standards)
Monte Sereno Design Review (/us/california/monte-sereno/design-review)
Monte Sereno Overlay Districts (/us/california/monte-sereno/overlay-districts)
Monte Sereno ADUs (/us/california/monte-sereno/adu)
Monte Sereno Parking (/us/california/monte-sereno/parking)
California Building Standards Code (/us/california/building-codes)

Sources

Retrieved passages

Monte Sereno Zoning Code (§1) High relevance
Monte Sereno Zoning Code (Section 10.21.050) Medium relevance
Monte Sereno Zoning Code (§ 5) Medium relevance
Monte Sereno Zoning Code (Section 10.21.170) Medium relevance
Monte Sereno Zoning Code Medium relevance
Monte Sereno Zoning Code (Section 65801) Medium relevance
Monte Sereno Zoning Code (Chapter 10) Medium relevance
Monte Sereno Zoning Code (Chapter 10.08) Medium relevance
Monte Sereno Zoning Code (§ 1) Medium relevance
Monte Sereno Zoning Code (§ 1) Medium relevance

Cited sections

Official Monte Sereno code library

Frequently asked questions

What counts as a "historic structure" under Monte Sereno's zoning code?

A building qualifies if it is listed or preliminarily determined eligible for the National Register, contributes to a National Register district, is on a state inventory in an approved state program, or is on a local inventory recognized by the Secretary of the Interior; see § 10.21.050.

If my house is historic, do I still need Site & Architectural Commission review for an addition?

Yes — if the project meets the Site Development Permit thresholds (new main house, additions above the square‑foot or roof‑height triggers, second‑story work) it will be reviewed by the Commission under § 10.08.040 and § 10.08.010; historic status does not automatically exempt you from that design review.

Does Monte Sereno have a local landmark or historic‑district ordinance?

Not found in the retrieved materials. The Code references federal/state/local inventories but the documents we retrieved do not show a municipal program for local landmark designation — verify with the City Clerk or Planning Department. Not found in retrieved materials.

Can I get a floodplain variance for work on a historic building?

Yes — the floodplain provisions authorize a variance for repair/rehabilitation of a historic structure if the work will not preclude its historic designation and the variance is the minimum necessary to preserve character; see § 10.21.230 and § 10.21.240.

Will a wireless company be able to install an antenna on my historic property without public review?

No — the ordinance requires a Conditional Use Permit for personal wireless facilities located on sites the City recognizes as historically significant, so those installations are treated as discretionary projects under § 10.09.050.

Do conservation or scenic corridor overlays change how historic properties are treated?

Yes — the Conservation Zone and Saratoga‑Los Gatos / Quito Road Scenic Corridor rules impose additional setbacks, tree and creek protections, and architectural review for visible structures; those rules can materially affect the setting of a historic property (§ 10.05.060–070).

If my historic house is nonconforming, can I rebuild after damage?

Ordinary maintenance of nonconforming structures is allowed, and a structure damaged by natural disaster may be rehabilitated to pre‑damage condition if reconstruction begins within six months; see § 10.07.070 for the nonconforming maintenance and reconstruction rules. Verify specifics with the Planning Department.

Where do I find the specific setback and lot coverage numbers that will apply to a historic property?

Those dimensional standards are in the City's development standards (Chapter 10.05 and the Development Standards documents). The retrieved excerpts do not include the full dimensional tables — verify the numeric standards in Development Standards. Not found in retrieved materials. (/us/california/monte-sereno/development-standards)

Can an ADU be built on a historic property in Monte Sereno?

State ADU law allows ADUs on lots with historic resources subject to objective standards that prevent adverse impacts; check Monte Sereno’s local ADU rules for any objective design standards and how the city applies them to historic properties. See state guidance and local ADU link. (/us/california/monte-sereno/adu)

Who do I contact to confirm whether my property is on any City-recognized historic list?

Contact the City Planner or City Clerk; the Code does not publish a municipal list in the retrieved materials, so staff will confirm if a property is recognized locally or only at state/federal levels. Not found in retrieved materials.

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