Fresno County — Overlay Districts

Last reviewed: July 3, 2026

Overview

Overlay (combining) districts in Fresno County modify the rules of the underlying zone for parcels in unincorporated areas that share special features (scenic corridors, mountain communities, historic resources, etc.). The overlay chapter and the identification/applicability rules are in § 818.2.010 and the individual overlay rules follow in §§ 818.2.020–818.2.090.

Note: this page covers ONLY the County Zoning Ordinance provisions that apply to unincorporated Fresno County (the ordinance is commonly organized under Title 17 / Division VI—Zoning). Verify parcel-specific application with County maps and staff. Do not substitute this guidance for a project-level check with the County.

How Fresno County overlays work (basics)

• Overlays are shown on the County zoning/overlay map by suffixing the overlay letters to the underlying zone symbol (for example, R‑1‑m) per § 818.2.010.C.
• Where an overlay conflicts with other ordinance language, the overlay chapter controls: § 818.2.010.D.
• Unless the overlay text says otherwise, the underlying zone’s permitted uses, setbacks, height, coverage, and many development rules remain in effect; overlays add or modify standards and procedures. See § 818.2.030 and cross‑references in each overlay section.

(First time related topics are mentioned they are linked: see Fresno County Zoning, Fresno County Development Standards, Fresno County Parking, Fresno County Design Review, Fresno County Historic Preservation, California ADU law, and California Building Standards Code.)

District-by-district breakdown

M (Mountain) Overlay — purpose & where it applies

• Purpose: provide residential and limited retail/service development rules for mountain and foothill communities; may be applied to any zone except O (Open Conservation) and AE (Exclusive Agricultural). See § 818.2.020.A.

Typical permitted uses (how overlays relate to the underlying zone)

• Uses are primarily those of the underlying zone; some uses/alterations are elevated to Director Review or Conditional Use Permit because of mountain conditions. See § 818.2.030.A–B.

Key dimensional & development standards

• Minimum parcel size and dimensions default to the underlying zone unless the overlay provides a specific reference: § 818.2.040.A–B.
• Maximum gross residential density is limited to one dwelling per 4,350 sq ft where underlying zones would otherwise allow greater density; multi‑family only by planned unit development; large parcels (≥10 acres) generally require a Conditional Use Permit except one single‑family dwelling — see § 818.2.040.C. § 818.2.040.
• Height, setbacks, lot coverage, space between structures, parking, fences, and other standards default to the underlying zone unless the M overlay specifies otherwise: § 818.2.040.

Practical notes

• Expect extra Director Review requirements (site plan showing topography, trees, wells/septic) due to mountain site constraints: § 818.2.040.M.

NB (Neighborhood Beautification) Overlay — purpose & where it applies

• Purpose: preserve appearance/maintenance standards in designated unincorporated neighborhoods with a reputation for well‑kept properties. See § 818.2.020.B.

Typical permitted uses

• Permitted uses remain those of the underlying zone; the overlay’s rules focus on property maintenance, parking/storage limitations, and aesthetic controls: § 818.2.050.

Key standards to watch

• Parking & storage: NB imposes additional restrictions on front‑yard storage of trailers, boats, and similar items (prohibited on front lawns and street‑facing side yards, with limited exceptions) and applies more restrictive off‑street parking provisions where stated. See § 818.2.060.A.
• Property maintenance: prohibitions on visible solid waste, junk, and unmaintained vegetation on residentially‑zoned NB parcels — see § 818.2.060.B.

Practical notes

• NB may treat existing items as nonconforming but may also disallow nonconforming status for some storage items; confirm whether your parcel is NB‑zoned and whether exceptions apply to R‑A/R‑R underlying zones. See § 818.2.060.

HB (Highway Beautification) Overlay — purpose & where it applies

• Purpose: apply consistent aesthetic and buffering standards to lands along Highway 99 to improve the corridor’s visual character. See § 818.2.020.C.

Typical permitted uses

• Uses default to the underlying zone; HB focuses on site layout, signage, landscaping and screening for highway visibility. See § 818.2.070 and § 818.2.080.

Key standards to watch (decision‑critical)

• Landscape buffers: HB requires landscape buffers adjacent to highways with minimum depths that vary by highway grade (at‑grade, elevated, depressed). Examples: 20 ft buffer for at‑grade adjacent residential/commercial uses; trees at 1 per 25 ft of frontage in many configurations — see § 818.2.080.H.5 and table figures.
• Sign limits and placement: freestanding sign number, height and area may be restricted based on distance from highway; monument signs in buffers limited to 60 sq ft; formulaic height/area limits reference the underlying zone or HB formula (see § 818.2.080.H.5.a and following).
• Screening: heavy uses visible from the highway (wrecking yards, recycling, substations, etc.) require deeper buffers (20 ft), continuous shrub hedges and trees at 20 ft on center, with no structures permitted in the buffer. § 818.2.080.H.5.g.

Practical notes

• HB imposes both quantitative buffer/tree planting and qualitative design/aesthetic controls; plan for landscape, sightline, and monument sign constraints early. See § 818.2.080.

HP (Historic Preservation) Overlay — purpose & where it applies

• Purpose: protect resources on the County’s historic inventory and require review/approval for demolition, alteration, or addition. See § 818.2.090.

Key procedural/permit controls

• Property owners may request rezoning to apply the HP overlay; once applied, demolition/alteration/addition to structures is subject to review by the Fresno County Historic Landmarks and Records Advisory Commission and typically requires a Certificate of Appropriateness. See § 818.2.090.A–B.
• Required findings for a Certificate of Appropriateness include no adverse effect on character/architectural features, CEQA consistency, and conformance with Zoning and General Plan policies. See § 818.2.090.C.

Practical notes

• No structural changes may be made without Commission authorization except to address immediate health/safety issues; denials are appealable to the Board of Supervisors. See § 818.2.090.

Quick Reference — Most decision‑relevant standards (table)

Checklist (what an applicant must satisfy for an overlay parcel)

• Confirm your parcel is within the overlay on the County zoning/overlay map (overlay map symbol, suffix letters) — see § 818.2.010.C.
• Determine whether the overlay changes the underlying permitted uses or only adds review steps (refer to the overlay’s Allowable Uses section — § 818.2.030 / 818.2.050 / 818.2.070 / 818.2.090 as applicable).
• Prepare site plans showing topography, protected trees, wells/septic if required (site plan requirements under overlays and cross‑referenced Site Plan Review rules) — see § 818.2.040.M and underlying Site Plan Review chapters.
• For HB parcels: include landscape buffer plans, tree schedule (e.g., 1 tree / 25 ft highway frontage) and sign placements to meet § 818.2.080.H.5 standards.
• For HP parcels: be prepared to submit to the Historic Landmarks Commission for a Certificate of Appropriateness and demonstrate the required findings in § 818.2.090.C.
• Confirm whether the project needs Director Review, a Conditional Use Permit, or other discretionary review as required by the applicable overlay subsection. See relevant overlay Allowable Uses and Development Standards sections.

(See also Fresno County Development Standards, Fresno County Parking, and Fresno County Design Review for parallel technical requirements; first mention of those pages are linked above.)

Risks & Ambiguities

Plain‑English Summary

If your property in an unincorporated part of Fresno County has an overlay letter after its zone on the County map (for example, R‑1‑m, R‑1‑nb, C‑hb, or R‑1‑hp), that overlay adds or changes rules for your project: Mountain (M) limits some densities and adds site review; Neighborhood Beautification (NB) tightens front‑yard storage and maintenance rules; Highway Beautification (HB) requires highway buffers, trees, and sign/landscape controls; Historic Preservation (HP) requires Commission approval for changes. Always check the overlay chapter (§§ 818.2.010–818.2.090) and the County map before you design.

Source References

• Fresno County Zoning Ordinance, Chapter 818.2 “Overlay/Combining Zones” — § 818.2.010–818.2.090.
• Fresno County Zoning Ordinance (Table of Contents and cross‑references to Articles/Chapters referenced above).
• M Overlay uses and standards (§ 818.2.030–040) (Mountain Overlay details).
• NB Overlay uses and standards (§ 818.2.050–060) (Neighborhood Beautification details).
• HB Overlay standards and highway buffer/sign rules (§ 818.2.070–080, including buffer figures/tables).
• HP Overlay procedures and Certificate of Appropriateness (§ 818.2.090).

Retrieved passages

• Fresno County Zoning Code (Chapter and) High relevance show source text
• Fresno County Zoning Code (CHAPTER 818.2) High relevance show source text
• Fresno County Zoning Code (Chapter 818.2) Medium relevance show source text
• Fresno County Zoning Code (Chapter 818.2) Medium relevance show source text
• Fresno County Zoning Code (Chapter 828.3) Medium relevance show source text
• Fresno County Zoning Code (Chapter 818.2) Medium relevance show source text
• Fresno County Zoning Code (Chapter 818.2) Medium relevance show source text
• Fresno County Zoning Code (Chapter 818.2) Medium relevance show source text

Cited sections

• Fresno County Zoning Ordinance, Chapter 818.2 “Overlay/Combining Zones” — **§ 818.2.010–818.2.090**. (Chapter 818.2)
• Fresno County Zoning Ordinance (Table of Contents and cross‑references to Articles/Chapters referenced above).
• M Overlay uses and standards (**§ 818.2.030–040**) (Mountain Overlay details). (§ 818.2.030)
• NB Overlay uses and standards (**§ 818.2.050–060**) (Neighborhood Beautification details). (§ 818.2.050)
• HB Overlay standards and highway buffer/sign rules (**§ 818.2.070–080**, including buffer figures/tables). (§ 818.2.070)
• HP Overlay procedures and Certificate of Appropriateness (**§ 818.2.090**). (§ 818.2.090)
• FresnoCounty_ZoningCode.md

• Official Fresno County code library