Los Angeles County, CA Historic Preservation: HPOZ Rules (2026)
Key Facts
- Established by
- Ordinance (overlay zone)
- Effective date. Historic Highlands District
- July 9, 2026 (Altadena)
- Historic district standards vs. Title 22
- Historic district standards prevail
- COA exemptions
- Painting, landscaping, rear-yard tree work, non-visible non-structural work
- Governing chapter
- 22.124 (Historic Preservation)
Summary
Properties within LA County's Historic District overlays must comply with special development standards, and in the Historic Highlands Historic District (Altadena, established July 2026), most building alterations require a Certificate of Appropriateness.
22.82.050 - Historic Highlands Historic District. A.Effective Date. The effective date of the establishment of the Highlands Historic District (District) is July 9, 2026. B.District Location and Map. The District is located in the unincorporated community of Altadena... F.Certificate of Appropriateness Exemptions. A certificate of appropriateness is not required for the following work:1.Painting or staining;2.Landscaping;3.Removal or pruning of trees located in rear yards; or4.Work that:a.Does not involve the construction or alteration of a building;b.Does not alter a character-defining feature; andc.Is not visible from the public right-of-way, absent of any temporary feature, such as fencing or landscaping.
Full Breakdown
Historic districts are established by ordinance as supplemental overlay zones; where district standards conflict with other Title 22 provisions, the district standards prevail. Exemptions from the Certificate of Appropriateness include painting, landscaping, rear-yard tree pruning/removal, and any work that does not involve building construction or alteration, does not alter a character-defining feature, and is not visible from the public right-of-way. The district's character-defining features include significant front yard setbacks, mature street trees, and low fencing.
Violations & Fines
Altering a contributing structure without a required Certificate of Appropriateness is subject to zoning enforcement under Chapter 22.242.
Frequently Asked Questions
Do I need county approval to paint my house in a historic district?
Can I do landscaping without approval?
What triggers a Certificate of Appropriateness?
Sources & Official References
Other rules in Los Angeles County
California rules heatmap·Compare Los Angeles County to another location·View the California historic preservation overview
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