Local zoning · Monterey County

Monterey County — Historic Preservation

Historic Preservation under the Monterey County local zoning and planning code, with the controlling citations.

Last reviewed: July 6, 2026

Overview

This page explains how Historic Preservation is handled by Monterey County’s zoning/planning ordinance for the unincorporated areas. In the Coastal Zone, historic resources are regulated through the Historic Resources (HR) combining district in Title 20, along with related review procedures and approval findings. Inland rules may parallel coastal provisions, but were not available in the retrieved materials; see Information Gaps below. Always verify parcel-specific details, including whether an HR overlay applies.

Key rule in plain English: In the Coastal Zone of unincorporated Monterey County, you may not alter a designated historic resource or a property in an HR district without the required coastal permit unless the work qualifies as a minor alteration approved by the Planning Director (§ 20.54.080.A–B; § 20.54.050.B ).

Before you plan design work, also check if your site has other layers like overlay districts, design review, baseline development standards, or parking requirements that may still apply.

What the ordinance covers (Coastal Zone, Title 20)

The Coastal Zoning Ordinance applies in unincorporated areas within the Coastal Zone and establishes districts, permit processes, and development standards (§ 20.02.010–.040 ).
The Historic Resources (HR) district is a combining overlay used to protect “structures and areas of historic, architectural and engineering significance” and archaeological resources (§ 20.54.010; § 20.54.020.A ).
“Alteration” is broadly defined and includes exterior changes, grading, tree removal, new structures/fences, demolition, and placement/removal of exterior objects (signs, plaques, fixtures, etc.). Painting and ordinary maintenance are excluded (§ 20.54.030.A; definitions H–J ).
Applications (other than those limited to archaeological resources) must be sent to the Historic Resources Review Board (HRRB) for advisory review; allow at least 30 days (§ 20.54.040.A–B ).
Who decides: Planning Commission is the “Appropriate Authority” for required coastal permits; the Planning Director may approve minor alterations and minor modifications to approved projects, using the same standards as the Commission. Director may not act on alterations that require a public hearing (e.g., Coastal Development Permit, Variance) (§ 20.54.050.A–C ).
Required findings: Approvals must find no adverse effect on significant features, consistency with district guidelines, and compatibility of new improvements on a designated site; hardship/safety findings are also recognized (§ 20.54.060.E(1)–(5) ).
Permit trigger: No alteration may occur in an HR district without a Coastal Development Permit unless the work qualifies as a “minor alteration” approved by the Director (§ 20.54.080.A–B; § 20.54.050.B ).
Existing vs. new construction: Existing designated structures are not subject to the base district’s height and setback provisions; new construction on designated sites must meet the base district’s height and setback standards (§ 20.54.080.C–D ).
Protection/mitigation: Projects on parcels with an identified historic resource must be designed to avoid significant adverse impacts; feasible mitigation recommended by HRRB or required surveys must be conditions of approval (§ 20.54.080.E–F ).
Mapping/easements: When approving demolition or alteration of an identified resource, the County may require rezoning to add or adjust the HR overlay so it applies only to the designated site and require placing the resource in a historic easement; owners must be notified before property is placed in HR (§ 20.54.080.G–I ).
Fees: No fee for a Coastal Development Permit required specifically by § 20.54.080.A, and no fee for referral to HRRB (§ 20.54.090 ).
Archaeology: Development/alteration in areas of archaeological sensitivity is processed under § 20.66.050 without HRRB referral (§ 20.54.100 ).
Flexibility: To facilitate preservation/rehabilitation, the Director may grant exceptions to zoning standards (e.g., parking, yards, height, coverage) for historically significant structures, but cannot allow uses not otherwise allowed in the zone (§ 20.64.300.A–B ).

District-by-district breakdown (unincorporated areas)

Historic Resources (HR) — Coastal Zone combining district

Purpose: Protect and perpetuate significant historic and archaeological resources (§ 20.54.010 ).
Where it applies: On parcels in the Coastal Zone that have been mapped with the HR overlay; HR provisions apply in addition to the base zone, and where conflicts exist, HR controls (§ 20.54.020.A ).
Typical permitted uses: Same as the base zoning; HR is a combining district. HR review does not add new uses and cannot approve uses not otherwise allowed (§ 20.64.300.B ).
Key dimensional standards:
- Existing designated structures are exempt from base district height and setback provisions (§ 20.54.080.C ).
- New construction on designated sites must meet base district height and setback provisions (§ 20.54.080.D ).
Process highlights:
- HRRB advisory review with minimum 30-day window (§ 20.54.040.A–B ).
- Coastal Development Permit required for alterations unless eligible as a Director-approved minor alteration (§ 20.54.080.A–B; § 20.54.050.B ).
- Approval findings must confirm no adverse effect on significant features and consistency with any adopted historic district guidelines (§ 20.54.060.E(1)–(3) ).

Design Control (D) — Coastal Zone combining district (interaction with historic resources)

Why it matters here: Many coastal areas with historic resources also carry a Design Control overlay requiring separate design approval; this is in addition to HR review and focuses on size, configuration, materials, and colors to protect the viewshed and neighborhood character (§ 20.44.010–.020; .030–.040 ).
Where it applies: Big Sur Coast, Carmel, and Del Monte Forest area plans (§ 20.44.020.C ).
Process: A Design Approval Application may be required; noticing and appeals procedures are specified in § 20.44.050–.090 (Planning Commission is the Appropriate Authority for high-visibility locations) (§ 20.44.040–.070 ).
Note: Design Control is not a historic-preservation district, but it can run concurrently with HR. Confirm both layers during pre-application. See Monterey County Design Review.

Historic resources — Inland (outside the Coastal Zone)

Not found in retrieved materials: Inland provisions (Title 21) for an HR or equivalent combining district and procedures were not included in the search results. Verify with the jurisdiction.

Most decision-relevant rules (Coastal HR overlay)

Topic/Trigger	What it means in practice (Coastal Zone)	Code Reference
Alterations to a historic resource or property in HR	Coastal Development Permit required unless the work is a Director-approved minor alteration	§ 20.54.080.A–B; § 20.54.050.B
HRRB advisory review	Application materials must be sent to HRRB; allow ≥30 days for recommendations	§ 20.54.040.A–B
Existing designated building envelope	Existing designated structures are exempt from base-zone height and setback	§ 20.54.080.C
New construction on a designated site	Must meet base-zone height and setback	§ 20.54.080.D
Approval findings	Must show no adverse effect on significant features/district character; compatibility for new work	§ 20.54.060.E(1)–(3)
Mitigation conditions	Feasible measures from HRRB/surveys must be attached as conditions	§ 20.54.080.F
Mapping/easement conditions	County can require adding/modifying HR overlay to cover only the designated site and require a historic easement when approving alteration/demolition	§ 20.54.080.G–I
Archaeology	Processed under § 20.66.050 without HRRB referral	§ 20.54.100
Fee relief	No fee for the HR-triggered Coastal Development Permit or HRRB referral	§ 20.54.090
Flexibility to save a resource	Director may grant exceptions to zoning standards (e.g., parking, yards, height, coverage) to allow preservation/rehab; cannot approve new uses	§ 20.64.300.A–B

Practical guidance for applicants

Pre-check layers: Confirm whether your parcel lies in the Coastal Zone and has an HR overlay in addition to any overlay districts or design review triggers (§ 20.02.010–.040; § 20.54.020.A; § 20.44.020.C ).
Scope your “alteration”: Many site changes count as “alteration,” from grading to sign changes. Painting and ordinary maintenance are excluded (§ 20.54.030.A; H–J ). Changes to signage often trigger HR review.
Sequence your permits: If HR applies, build your submittal around the HRRB’s standards and the required approval findings (§ 20.54.040; § 20.54.060.E ). If your project also needs a combined permit with other entitlements, you may process under the County’s combined permit procedures (§ 20.82.010–.050 ).
Use the flexibility tool: If a strict standard would block preservation, the Director can grant targeted exceptions to development standards to make preservation feasible (§ 20.64.300.B ). See Monterey County Variances and Exceptions for related relief mechanisms.
Nonconformities: Outside the explicit HR exemptions for designated structures, normal nonconforming and development standards still apply.
Other state frameworks: Construction work itself is governed by the California Building Standards Code. This page does not cover building code compliance; coordinate with your building official.
Housing projects and ADUs: State California housing laws and California ADU law may apply; local HR standards can prevent adverse effects on listed resources while still allowing compliant housing solutions. Verify with the jurisdiction.

Checklist

Confirm your site is in unincorporated Monterey County and whether it lies in the Coastal Zone (§ 20.02.010 ).
Determine if an HR overlay applies, or if your resource is a “designated site” (§ 20.54.020.A; § 20.54.030.C ).
Define the scope of “alteration” and whether it is “minor” under the ordinance (§ 20.54.030.A, F; § 20.54.050.B ).
Prepare application materials that address the approval findings and anticipated mitigation (§ 20.54.060.E; § 20.54.080.F ).
Account for HRRB review timing (≥30 days) (§ 20.54.040.B ).
If demolition/major alteration is proposed, be ready for conditions including HR overlay adjustments and a historic easement (§ 20.54.080.G–I ).
If also in a D overlay, file for Design Approval and coordinate materials accordingly (§ 20.44.030–.060 ).
If seeking relief from dimensional standards to save a resource, request exceptions under § 20.64.300.B (cannot change allowed uses) (§ 20.64.300.B ).

Risks & Ambiguities

Issue	Why it matters	What to verify
Whether HR overlay actually applies to your parcel	HR rules only attach where mapped or designated; conditions may remap overlay to the specific “designated site”	Confirm zoning map and any prior conditions of approval (§ 20.54.020.A; § 20.54.080.G )
Is the work a “minor alteration”?	Minor alterations can be Director-approved and may avoid a CDP	Align scope with § 20.54.030.F and consult staff early (§ 20.54.050.B )
Interaction with Design Control (D)	D adds a separate design approval process and standards	Check whether you’re in Big Sur, Carmel, or Del Monte Forest and plan for dual tracks (§ 20.44.020.C )
Archaeological sensitivity	Archaeology is processed under a different section without HRRB referral	Whether § 20.66.050 applies and what surveys/mitigation are needed (§ 20.54.100 )
Dimensional compliance for new work on designated sites	Existing designated buildings are exempt, but new construction is not	Design additions/new structures to base-zone standards (§ 20.54.080.C–D )
Easement and notice conditions	Projects involving demolition/alteration can trigger historic easements and overlay adjustments	Anticipate easement language and notice requirements (§ 20.54.080.G–I )
Inland (Title 21) rules	Inland historic resource procedures may differ from coastal	Not found in retrieved materials; verify with the jurisdiction

Plain-English Summary

If your unincorporated Coastal Zone property in Monterey County has an HR overlay or a designated historic resource, nearly any exterior work—new structures, additions, grading, tree removal, or signs—counts as an alteration and needs the right coastal approval, with HRRB input and specific findings to protect the resource. Existing designated buildings get relief from height and setback rules, and the County can grant exceptions to other standards to make preservation feasible. Plan early and coordinate with staff so your design, permits, and any easement conditions align with the HR rules.

Source References

Title 20 Coastal Zoning Ordinance applicability and purpose: § 20.02.010–.040
Historic Resources (HR) district purpose/applicability/definitions: § 20.54.010–.030
HRRB referral and timing: § 20.54.040.A–B
Appropriate Authority; Director authority for minor alterations: § 20.54.050.A–C
Approval findings and conditions: § 20.54.060.A–E
Permit triggers; existing vs. new construction standards; mitigation; overlay/easement conditions; fees; archaeology: § 20.54.080.A–I; § 20.54.090–.100
Flexibility to adjust zoning standards for preservation: § 20.64.300.A–B
Design Control overlay scope and process: § 20.44.010–.070

Sources

Retrieved passages

Monterey County Zoning Code (Chapter 20.54) High relevance
Monterey County Zoning Code (Section 20.54.050B) High relevance
Monterey County Zoning Code (chapter and) Medium relevance
Monterey County Zoning Code (Section 20.54.080) Medium relevance
Monterey County Zoning Code (Section 20.54.080) Medium relevance
Monterey County Zoning Code (Title and) Medium relevance
Monterey County Zoning Code (Title is) Medium relevance
Monterey County Zoning Code (Title 20) Medium relevance
Monterey County Zoning Code (Chapter 20.70) High relevance
Monterey County Zoning Code (Chapter 20.86) Medium relevance

Cited sections

Title 20 Coastal Zoning Ordinance applicability and purpose: § 20.02.010–.040 (Title 20)
Historic Resources (HR) district purpose/applicability/definitions: § 20.54.010–.030 (§ 20.54.010)
HRRB referral and timing: § 20.54.040.A–B (§ 20.54.040.A)
Appropriate Authority; Director authority for minor alterations: § 20.54.050.A–C (§ 20.54.050.A)
Approval findings and conditions: § 20.54.060.A–E (§ 20.54.060.A)
Permit triggers; existing vs. new construction standards; mitigation; overlay/easement conditions; fees; archaeology: § 20.54.080.A–I; § 20.54.090–.100 (§ 20.54.080.A)
Flexibility to adjust zoning standards for preservation: § 20.64.300.A–B (§ 20.64.300.A)
Design Control overlay scope and process: § 20.44.010–.070 (§ 20.44.010)
MontereyCounty_ZoningCode.md

Official Monterey County code library

Frequently asked questions

Do I need a Coastal Development Permit to change windows or add a fence on a historic property?

If your property is in an HR district or is a designated resource in the Coastal Zone, most exterior work counts as an “alteration” and typically needs a Coastal Development Permit unless it qualifies as a Director-approved “minor alteration.” Signs, fences, lighting, and grading can all be “alterations.” Confirm scope against § 20.54.030(A), (F) and § 20.54.080.A–B .

Who reviews my historic project and how long does that take?

Your application is referred to the Historic Resources Review Board (HRRB) for recommendations, with at least 30 days for review. The Planning Commission is the default decision-maker for required coastal permits; the Planning Director may approve minor alterations using the same review standards (§ 20.54.040.A–B; § 20.54.050.A–B ).

Can I demolish or significantly alter a designated historic resource?

Demolition or major alteration can be conditioned on adding/modifying the HR overlay to apply only to the designated site and placing the resource in a historic easement. You must receive notice if property is to be placed in HR, and approvals must make required findings protecting the resource (§ 20.54.060.E; § 20.54.080.G–I ).

Do height and setback rules still apply to my historic building?

Existing designated structures are exempt from the base zone’s height and setback rules. New construction on a designated site must meet the base zone’s height and setback standards (§ 20.54.080.C–D ).

Are there fee waivers for historic projects?

Yes. There is no fee for a Coastal Development Permit required specifically by § 20.54.080.A and no fee for HRRB referrals (§ 20.54.090 ).

What if strict zoning standards would prevent preservation?

The County can grant targeted exceptions to zoning standards (e.g., parking, yards, height, coverage) to enable preservation or restoration of a historically significant structure. This relief cannot authorize uses not allowed in the zone (§ 20.64.300.A–B ).

How are archaeological resources handled?

Archaeological sensitivity is processed under § 20.66.050 without HRRB referral. Expect surveys and feasible mitigation to be attached as conditions where appropriate (§ 20.54.100; § 20.54.080.F ).

If my property is also in a Design Control (D) overlay, what changes?

Design Control adds a separate design approval focusing on size, configuration, materials, and colors. It commonly applies in Big Sur, Carmel, and Del Monte Forest and can run concurrently with HR review (§ 20.44.010–.020; .050–.070 ).

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