Local zoning · Yolo County

Yolo County — Historic Preservation

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

Last reviewed: July 6, 2026

Overview

Yolo County’s historic preservation rules live in Title 8, Chapter 11 (“Historic Landmarks”) of the County Code and apply only in the unincorporated areas. The ordinance allows the County to designate individual Historic Landmarks and multi‑property Historic Districts, and it sets a permit and review process for exterior work, demolition, removal, or relocation affecting designated resources. The Planning Commission serves as the Historic Preservation Commission, and the Board of Supervisors makes final designation decisions by resolution (§ 8-11.101 to § 8-11.105 ; § 8-11.103(c) ).

Plain English: If your property in the unincorporated areas is a designated Historic Landmark or lies in a designated Historic District, you generally cannot demolish, move, or change its exterior without written approval through the County’s historic review process (§ 8-11.104 ).

The preservation layer sits on top of base zoning; you still must meet your underlying zone’s standards (see the County’s zoning and development standards). For broader process context, see the County’s design review page and overlay districts. This page covers preservation rules only; construction codes are addressed separately under the California Building Standards Code.

What qualifies as historic

Designation criteria. A resource can be designated a Historic Landmark if it meets one or more criteria tied to cultural, architectural, engineering, or community significance (e.g., association with important events/people, distinctive architectural style, notable builder/architect, or important natural features) (§ 8-11.102(a) ).
Historic Districts. An area can be designated a Historic District when it contains at least two designated Historic Landmarks that together form a historically significant setting; the district may include contributing and non‑contributing properties (§ 8-11.102(b) ).

Who decides and how designation occurs

Historic Preservation Commission. The Planning Commission is designated to act as the Historic Preservation Commission (§ 8-11.103(a) ).
Initiation and hearing. Designation can be initiated by the Commission or by request of an affected owner/County agency. A public hearing with mailed and newspaper notice is required; owners of subject and adjacent parcels receive notice at least 15 days before the hearing (§ 8-11.103(b)(1)–(2) ).
Board action. The Board of Supervisors approves, modifies, or denies designation by resolution after a publicly noticed hearing; written notice of the decision goes to affected owners (§ 8-11.103(c)(1)–(2) ).

When historic approval is required (triggers and thresholds)

Core trigger. No one may demolish, remove, move, make exterior alterations to, or excavate in a way that affects a designated Historic Landmark, or any structure within a designated Historic District, without written approval. Emergency safety work authorized by the Building Official may proceed with written Planning approval for public safety (§ 8-11.104 ).
Design review guidelines. The ordinance provides detailed screening to determine who reviews what: some work is exempt, some is staff‑level, and some requires Commission review, with a $500 cost threshold for certain projects (§ 8-11.105(a)–(d) ).

What needs approval? (quick guide)

Activity (designated Landmark or in designated District)	Who reviews/approves	Notes	Code Reference
House painting; routine maintenance/repair; landscaping/sprinklers; flat concrete work; all interior alterations; screens/awnings	Exempt from this chapter (confirmation by Planning required)	No Commission review; confirm exemption before permit issuance	§ 8-11.105(a)
Roofing; yard fences/walls; retaining walls; chimney/foundation work; window/door alterations or replacements; solar collectors on roof; mechanical systems (A/C, heating)	Planning staff; Commission only if Director refers	Building permit still required where applicable	§ 8-11.105(b)
Repairs to replace/replicate original architecture; surfacing/re‑surfacing exterior walls; additions/alterations to porches	Commission (if estimated construction cost > $500)	Building permit fees are waived for these projects	§ 8-11.105(c)
Room additions to historic structures	Commission	Building permit required	§ 8-11.105(d)
Demolition, removal, or relocation	Commission	Commission can approve or stay up to 90 days to seek alternatives	§ 8-11.107(a), § 8-11.110(a)

Application and review process

Application. File with the Planning, Public Works and Environmental Services Department on a County form with project/location details and required submittals; alteration applications are screened under the design review criteria (§ 8-11.106(a)–(b) ).
Routing. If Commission review is not required, staff reviews; otherwise, the application is set for Commission hearing (§ 8-11.106(d) ).
Hearing and timeline. The Secretary may refer the matter to a local Historical Society/Committee (30 days to comment). The Commission holds a public hearing and must decide within 90 days of filing; if it fails to act, the application is deemed approved unless time is extended by agreement (§ 8-11.107(a) ).
Approval letter. The Building Official cannot issue a building permit until the Commission files a letter of approval; approved work must begin within one year (§ 8-11.107(b)–(c) ).

How decisions are made (substantive criteria)

Evaluation standards. The Commission considers local historical society recommendations, the resource’s historical/architectural significance and context, exterior design compatibility, plans for new/low‑value structures, and conformance with the design guidelines and General Plan (§ 8-11.108(a)–(g) ).
Exterior focus. The Commission’s purview is limited to exterior features unless the applicant voluntarily includes interior elements (§ 8-11.109 ).
Demolition/moving safeguards. Demolition can be approved or stayed up to 90 days while alternatives are explored. Approval is required if retention poses a safety hazard that cannot be economically remedied, and moving may be allowed as a last alternative after all on‑site options are exhausted (§ 8-11.107(a), § 8-11.110(a)–(d) ).
Re‑applications and pre‑existing permits. A denied application cannot be resubmitted for one year, and projects already under a valid building permit at the ordinance’s effective date are exempt (§ 8-11.111–§ 8-11.113 ).

Appeals

Appeals from Commission actions go to the Board of Supervisors within 15 days, with notice and hearing procedures aligned to the designation process (§ 8-11.114(a)–(c) ).
Appeals from staff (Director) decisions go to the Historic Preservation Commission, following the same fee and procedures used for Zoning Administrator appeals (§ 8-11.115 ).

Relationship to other county processes

Preservation review is in addition to base zoning, use permissions, and site standards in the unincorporated areas (§ 8-2.103; see also County zoning and development standards) .
Other permits (e.g., signage, site work, or discretionary entitlements) may still apply; see signage, design review, and overlay districts. If relief from strict standards is needed outside of historic review, see variances and exceptions.

District-by-district breakdown (unincorporated areas)

Designated Historic Landmarks (individual properties)

Purpose. Protects a specific building, structure, object, site, vegetation, or geology meeting one or more historic significance criteria (§ 8-11.102(a) ).
Typical permitted uses. No new uses are granted by designation; permissible uses remain those allowed by the base zone. Exterior work is subject to the historic approval framework above. Not found in retrieved materials for any change to base use permissions.
Key dimensional standards. Not found in retrieved materials; dimensional standards remain those of the base zone.
Where it applies. Any property in the unincorporated areas formally designated by Board resolution after Commission recommendation (§ 8-11.103(b)–(c) ).

Designated Historic Districts (multi‑property areas)

Purpose. Protect a historically significant setting composed of at least two designated Landmarks; may include both contributing and non‑contributing properties (§ 8-11.102(b) ).
Typical permitted uses. Same as underlying zoning; exterior work on any structure within the district may trigger historic review per the guidelines (§ 8-11.104, § 8-11.105 ).
Key dimensional standards. Not found in retrieved materials; base zone standards apply.
Where it applies. Any mapped district in the unincorporated areas designated by Board resolution after Commission process (§ 8-11.103(b)–(c) ).

Practical tips

Pre‑screen your scope against the exemption and staff‑review lists before you design. Even if your work is “routine,” staff must confirm exemptions in writing before permits issue (§ 8-11.105(a)–(b) ).
Budget time for the 90‑day Commission decision window on Commission‑level projects; deemed approval can occur if the Commission takes no action and no extension is agreed (§ 8-11.107(a) ).
Plan for compatibility. The Commission looks hard at exterior design compatibility and neighborhood context; align materials, form, and details accordingly (§ 8-11.108(b)–(f) ).
Coordinate early if demolition or relocation is contemplated; you’ll need to document that no economically feasible preservation alternative exists, or that a safety hazard cannot be reasonably abated (§ 8-11.110(a)–(c) ).

Checklist

Confirm whether your property is a designated Historic Landmark or within a designated Historic District in the unincorporated areas (Verify with the jurisdiction).
Define the scope of work and compare against exemptions and staff‑review items (§ 8-11.105(a)–(b) ).
If Commission review is required, prepare the application package with plans, photos, and supporting materials (§ 8-11.106(a)–(b) ).
Allow for referral/comment by a local historical society/committee and a Commission hearing (§ 8-11.107(a) ).
Obtain the Commission’s letter of approval; you cannot receive a building permit without it (§ 8-11.107(b) ).
Begin approved work within one year (§ 8-11.107(c) ).
If aggrieved, consider appeal routes and timelines (§ 8-11.114–§ 8-11.115 ).
Cross‑check other applicable County processes (e.g., design review, signage, variances and exceptions).

Risks & Ambiguities

Issue	Why it matters	What to verify
Is my property actually designated?	The historic rules apply only to designated Landmarks/Districts; non‑designated properties are not subject to this chapter	Ask Planning staff for current designations and any in‑process nominations (§ 8-11.103(b)–(c) )
Cost threshold for Commission review	Projects over $500 in certain categories escalate to Commission review	Confirm cost estimates and category with staff (§ 8-11.105(c) )
“Exterior features only” line	Interiors are outside Commission purview unless the applicant requests inclusion	Scope drawings to show only exterior work unless interior review is desired (§ 8-11.109 )
Emergency safety work	Some urgent work may proceed if authorized for public safety	Coordinate written Planning approval and Building Official authorization (§ 8-11.104 )
Demolition or relocation	Requires extra findings; Commission can stay demolition up to 90 days	Prepare feasibility documentation and alternatives analysis (§ 8-11.107(a), § 8-11.110(a)–(d) )
Appeals timing	Short 15‑day window to appeal	Calendar deadlines and grounds for appeal (§ 8-11.114–§ 8-11.115 )
Interaction with base zoning	Preservation adds review; it doesn’t change use or dimensional standards	Confirm underlying zone standards and other reviews (zoning, development standards)

Plain-English Summary

In the unincorporated areas, Yolo County can designate individual landmarks and multi‑property districts and then require historic review before exterior changes, demolition, or relocation. Some small‑scale work is exempt or staff‑reviewed, but larger or more sensitive projects go to the Historic Preservation Commission; you need its written approval before the Building Official can issue permits (§ 8-11.104 to § 8-11.107 ).

Source References

Yolo County Code, Title 8, Chapter 11 (Historic Landmarks): purpose, standards, procedures, permits, guidelines, criteria, scope, special considerations, appeals (§ 8-11.101–§ 8-11.115)
Yolo County Code, Title 8, Chapter 2 (Zoning Regulations): scope applies to unincorporated areas (§ 8-2.103)
For County process context, see: Yolo County zoning & planning overview, zoning, development standards, design review, overlay districts, signage, variances and exceptions, and California Building Standards Code.

Sources

Retrieved passages

Yolo County Zoning Code (chapter shall) High relevance
Yolo County Zoning Code (chapter shall) High relevance
Yolo County Zoning Code (Section 8-11.105) High relevance
Yolo County Zoning Code (Section 8-11.105) High relevance
Yolo County Zoning Code (article for) High relevance
Yolo County Zoning Code (Section 8-11.105) High relevance
Yolo County Zoning Code (article is) High relevance
Yolo County Zoning Code (Chapter 11) High relevance

Cited sections

Official Yolo County code library

Frequently asked questions

Do Yolo County historic rules apply everywhere in the County?

They apply only in the unincorporated areas, and only to properties formally designated by the County as Historic Landmarks or located within designated Historic Districts. The Zoning Regulations themselves apply countywide in the unincorporated areas (§ 8-2.103), while the preservation triggers are in Chapter 11 (§ 8-11.104) .

What exterior work can I do on a designated historic property without Commission review?

Routine maintenance like painting, landscaping, flat concrete work, interior changes, screens, and awnings are exempt (staff confirms the exemption). Roofing, fences/walls, window/door work, solar on roofs, and mechanical systems are reviewed at staff level unless referred to the Commission (§ 8-11.105(a)–(b) ).

When does a historic project go to the Commission instead of staff?

If your project involves replacing/replicating original architecture, re‑surfacing exterior walls, or altering/adding porches with an estimated construction cost over $500, or if you’re adding a room to a historic structure, it requires Commission review (§ 8-11.105(c)–(d) ).

Can the County stop or delay demolition of a historic building?

Yes. The Commission can stay a demolition for up to 90 days to explore alternatives. Demolition can be approved if the structure poses a public safety hazard that cannot be economically remedied; relocation may be allowed as a last resort (§ 8-11.107(a), § 8-11.110(a)–(d) ).

Do I need to match original materials and styles for additions or alterations?

The Commission evaluates compatibility of exterior design, arrangement, texture, and materials with the structure and its surroundings, and considers the design guidelines and General Plan. Exact replication isn’t always required, but compatibility is key (§ 8-11.108(b)–(g) ).

How long does historic review take, and when can I pull my building permit?

For Commission‑level projects, the Commission must decide within 90 days of a complete filing unless extended by agreement, and the Building Official cannot issue a permit until the Commission files its approval letter. Approved work must begin within one year (§ 8-11.107(a)–(c) ).

What if I disagree with the Commission’s decision?

You can appeal to the Board of Supervisors within 15 days. Appeals from staff decisions go to the Historic Preservation Commission, using the County’s standard appeal procedures (§ 8-11.114–§ 8-11.115 ).

Do ADUs or housing laws change historic review?

State housing rules don’t remove local historic protections. If a property is designated, the County’s preservation triggers for exterior work still apply; coordinate early to reconcile state timelines with local review (§ 8-11.104–§ 8-11.107) .

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