Local zoning · San Luis Obispo County

San Luis Obispo County — Development Standards

Q: What can I build on an RSF lot in unincorporated San Luis Obispo County?

Single-family homes and typical accessory uses are allowed; apply the base 25 ft front setback, side setbacks per the lot-width rule, a 10/30 ft rear yard (by lot size), and a 35 ft height limit unless a local standard is stricter. One primary dwelling per legal parcel is the base density unless a planning area standard says otherwise (those control). See § 22.10.140; § 22.10.090; § 22.10.130.A.3; § 22.01.033.

Q: What are the County’s default setback rules in unincorporated areas?

Default front is 25 ft for structures taller than 3 ft; side is 10% of lot width (max 5 ft , min 3 ft ) in urban/village areas; rear is 10 ft on lots <1 acre and 30 ft on lots ≥1 acre. Special contexts (multi-family, CBD, industrial, alleys, shallow/variable blocks, planned developments) have tailored rules. See § 22.10.140.D–F.

Q: How tall can my building be?

Heights vary by category: Residential Single-Family/Rural/Suburban 35 ft ; Multi-Family up to 40–45 ft (by intensity); Office & Professional 40 ft ; Recreation 40 ft ; Industrial 45 ft ; Public Facilities 45 ft ; Open Space 25 ft . Some overlays or community standards add tighter caps. See § 22.10.090 and applicable planning area standards.

Q: Do I need to landscape or screen within setback areas?

Yes, required setback areas must remain unobstructed (over 3 ft structures are limited) and are subject to landscape and fencing standards; CBD and corridor/frontage plans often add detailed planting or parkway requirements. See § 22.10.140.C–D and community standards excerpts.

Q: How are multi-family density and open space determined?

The County uses an “intensity factor” (based on street type and sewer service) to set maximum unit counts, cap total floor area as a percentage of usable site area, and require minimum open area. A 20 ft front setback also applies. See § 22.10.130.B and § 22.10.140.D.2.f.

Q: Can commercial buildings sit on the sidewalk downtown?

In mapped central business districts, front setbacks can be 0 ft for commercial/office uses; elsewhere they are typically 10 ft . Rear and side adjacency and alley rules still apply. See § 22.10.140.D.3 and § 22.10.140.F.2–3.

Q: Do ADU rules change setbacks or lot coverage?

Yes. State law guarantees at least one 800 sf ADU with 4-ft side and rear setbacks even if local lot coverage or FAR would otherwise preclude it, and sets objective height limits (generally 16–18–20 ft by context). See the State ADU law summary (Gov. Code cited).

Q: I’m near a scenic corridor—do normal setbacks still apply?

Highway Corridor/Sensitive Resource Area standards can impose scenic 100 ft thresholds from corridors, limit visible massing/height (often 25 ft ), and require landscaping/visual analysis. Those standards layer on top of the base setbacks and control if stricter. See § 22.10.095 and related area standards.

Q: Do these standards apply in the Coastal Zone?

No. Parcels in the Coastal Zone use Title 23 (Coastal Zone Land Use Ordinance). This page summarizes Title 22, which applies inland in the unincorporated County. See § 22.01.050.

Q: Where do I find what uses are allowed in my district?

Use the Allowable Uses tables in Article 2 (e.g., RSF, RMF, CR, CS, IND) to see permitted/conditional uses and any specific use standards. Then apply the dimensional rules summarized here. See Article 2 table excerpts.

Development Standards under the San Luis Obispo County local zoning and planning code, with the controlling citations.

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Last reviewed: July 6, 2026

Overview

This page distills the development standards that apply in the unincorporated areas of San Luis Obispo County under Title 22, the County’s Land Use Ordinance. The rules below control setbacks, height, basic residential density, and related site-development limits by land use category (district). Parcels in the Coastal Zone use Title 23, not Title 22.

The default rule in unincorporated areas is a 25 ft front setback for structures taller than 3 ft, with detailed exceptions by land use category and context; planning area standards control if they conflict with the base ordinance. See § 22.10.140 and § 22.01.033.

Before you dive in, orient yourself to the County’s zoning framework and how it ties to mapped land use categories and any overlay districts that may add stricter standards.

Countywide development standards that cut across districts

Basic front setback: structures over 3 ft tall must be at least 25 ft from the front property line; there are tailored rules for multi-family, commercial/office, industrial, recreation, double-frontage, shallow lots, variable blocks, and planned developments. See § 22.10.140.D.
Side setbacks (general): in urban/village areas, 10% of lot width (max 5 ft, min 3 ft) on sites under 1 acre; minimum 30 ft on sites ≥1 acre, with limited adjustment potential. See § 22.10.140.E.1.
Rear setbacks (general): 10 ft on sites <1 acre; 30 ft on sites ≥1 acre, with special rules for commercial, industrial, office/recreation, multi-family, and alley conditions. See § 22.10.140.F.
Height limits by category: Residential Single-Family/Rural/Suburban 35 ft; Multi-Family up to 40–45 ft (by intensity); Office & Professional 40 ft; Recreation 40 ft; Industrial 45 ft; Public Facilities 45 ft; Open Space 25 ft. See § 22.10.090.
Residential density (base): One primary dwelling per legal parcel in the Single-Family categories unless a planning area standard establishes otherwise; multi-family density is determined by an “intensity factor” table that also caps maximum floor area and requires minimum open area. See § 22.10.130.A–B.
Planning area standards prevail if they conflict with the base ordinance; always confirm whether site-specific standards apply. See § 22.01.033.

If your project also triggers parking or design review, those pages explain how those separate chapters interact with the dimensional rules below. For fencing, walls, and landscape buffers, see Landscaping and Screening.

Quick table — typical dimensional standards by land use category (inland, Title 22)

Standards below summarize the most decision-relevant limits. Always verify parcel-specific planning area standards and overlays.

Land Use Category	Typical Front Setback	Typical Side Setback	Typical Rear Setback	Height Limit	Notes	Code Reference
Residential Single-Family (RSF), Residential Suburban (RS), Residential Rural (RR)	25 ft default; shallow lots may reduce to 20 ft; variable-block/parkway adjustments available	10% lot width, max 5 ft, min 3 ft (urban/village areas)	10 ft (<1 ac); 30 ft (≥1 ac)	35 ft	One primary dwelling per legal parcel unless a planning area standard says otherwise	§ 22.10.140.D–F; § 22.10.090; § 22.10.130.A.3
Residential Multi-Family (RMF)	20 ft minimum	General side rule applies unless modified	10 ft for sites ≥1 ac (general rule otherwise)	40–45 ft (by intensity)	Density, max floor area, and open area set by intensity factor (street type + sewer)	§ 22.10.140.D.2.f; § 22.10.140.F.4; § 22.10.090; § 22.10.130.B
Commercial Retail (CR) & Office and Professional (OP)	0 ft in CBD; 10 ft elsewhere	General side rule applies	10 ft; 0 ft in CBD; alley/residential adjacency rules apply	40 ft (OP)	Ground-floor residential follows residential setbacks	§ 22.10.140.D.3, F.3; § 22.10.090
Commercial Service (CS)	10 ft (treated with commercial/office rule)	General side rule applies	Generally no rear setback, except alley/residential adjacency	By district (not listed separately)	Check planning area/CBD exceptions	§ 22.10.140.D.3, F.2
Industrial (IND)	25 ft; interior/flag lots use side rule	General side rule applies	Generally no rear setback, with alley/residential adjacency rules	45 ft		§ 22.10.140.D.4, F.2; § 22.10.090
Recreation (REC)	10 ft minimum (some communities require 20 ft landscaped parkway)	General side rule applies	10 ft; alley/residential adjacency rules apply	40 ft	Residential density in REC depends on urban/rural service context	§ 22.10.140.D.5, F.3; § 22.10.090; § 22.10.130.A.4
Public Facilities (PF)	Follows basic front/side/rear unless modified by area standard	General side rule applies	General rear rules apply	45 ft		§ 22.10.140.D–F; § 22.10.090
Open Space (OS)	Follows basic front/side/rear unless modified by area standard	General side rule applies	General rear rules apply	25 ft		§ 22.10.140; § 22.10.090

Notes:

Setback adjustments exist for double-frontage, flag/easement access, shallow/variable-block lots, and planned developments. See § 22.10.140.D.6–7 and related subsections.
Community and corridor overlays (e.g., Sensitive Resource Area/Highway Corridor) can impose added slope, visibility, and height constraints; some require 100 ft screening setbacks from scenic corridors. See § 22.10.095 and SRA/Highway Corridor standards in the planning area chapters.

District-by-district breakdown (Title 22 land use categories)

Agriculture (AG) and Rural Lands (RL)

Purpose/uses: Production agriculture and rural resource uses dominate, with caretaker quarters and certain ag-support uses listed as allowable or permitted subject to the land use permit table. See allowable-use tables (AG, RL rows).
Key dimensional standards: Use the countywide defaults unless modified by a planning area standard or overlay; typical residential structures in these categories follow the general 25 ft front, side-percentage, and rear 10/30 ft rules; height varies by structure type (ag structures may be exempt from category height limits in certain cases). See § 22.10.140 and § 22.10.090.
Where it applies: Mapped on Official Land Use Maps in unincorporated areas; consult the County’s official maps. § 22.01.030.A.3.

Residential Rural (RR)

Uses: Single-family dwellings, residential accessory uses, and home occupations are typical. See countywide allowable-use tables.
Dimensions: Default 25 ft front; side per lot-width rule; rear 10/30 ft; height 35 ft for single-family. § 22.10.140; § 22.10.090.
Notes: Planning area standards may set minimum parcel sizes or cluster design; those prevail over base rules. § 22.01.033.

Residential Suburban (RS)

Uses: Single-family dwellings and related accessory/home occupation uses per the land use tables.
Dimensions: Default 25 ft front; side per lot-width rule; rear 10/30 ft; height 35 ft. § 22.10.140; § 22.10.090.
Where: Applied to large-lot suburban settings in unincorporated areas; planning area standards (e.g., Squire Canyon, Evans Tract) frequently refine parcel sizes and siting.

Residential Single-Family (RSF)

Uses: Single-family dwellings and accessory uses. See tables.
Dimensions: Same base setbacks as above; some communities require varied fronts or special frontage rules. Height for standard single-family is 35 ft, but specific community standards can be more restrictive (e.g., frontage <75 ft capped at 18 ft in some areas). See § 22.10.090 and RSF community standards excerpts.
Density: One primary dwelling per legal parcel unless a planning area standard allows otherwise. § 22.10.130.A.3.

Residential Multi-Family (RMF)

Uses: Multi-family residential; some projects may include private yards or common open space.
Dimensions: 20 ft minimum front; general side rule; rear 10 ft for sites ≥1 ac; height typically 40–45 ft (by intensity). § 22.10.140.D.2.f; § 22.10.140.F.4; § 22.10.090.
Density/FAR-like controls: An “intensity factor” (based on road type and sewer) governs maximum units, maximum floor area (as a percent of usable site area), and required open area. See § 22.10.130.B.

Office and Professional (OP)

Uses: Office/service uses; residential over ground-floor commercial has special setback treatment. See use tables and mixed-use sections.
Dimensions: 0 ft in central business districts; 10 ft front elsewhere; rear 10 ft (0 ft in CBD); side per general rule; height 40 ft. § 22.10.140.D.3, F.3; § 22.10.090.

Commercial Retail (CR)

Uses: Retail, restaurants, and other commercial per the tables; special “Main Street” style rules can apply in certain communities.
Dimensions: 0 ft in CBDs; 10 ft front elsewhere; rear per office/industrial adjacency rules; height limited by Title 22 and any local plan caps. § 22.10.140.D.3, F.2–3; § 22.10.090.

Commercial Service (CS)

Uses: Service/repair, gas stations, and heavier commercial functions (subject to specific use standards). See tables.
Dimensions: Treated like commercial/office for front/rear; verify adjacency/alley rules. § 22.10.140.D.3, F.2.

Industrial (IND)

Uses: Manufacturing, warehousing, terminals, and utility facilities per the tables.
Dimensions: 25 ft front; generally no rear setback except in CBD or where abutting alleys/residential; height 45 ft (uninhabited industrial structures can have separate allowances). § 22.10.140.D.4, F.2; § 22.10.090.

Recreation (REC)

Uses: Libraries, museums, outdoor sports, public assembly, etc., often with landscaping and frontage standards.
Dimensions: 10 ft front minimum (some communities require 20 ft landscaped parkways); rear 10 ft (0 ft in CBD) with adjacency rules; height 40 ft. § 22.10.140.D.5, F.3; § 22.10.090.
Residential density in REC: varies by urban/village vs rural services (e.g., 1 unit/acre to 1 unit/5 acres depending on water/sewer). § 22.10.130.A.4.

Public Facilities (PF) and Open Space (OS)

Uses: Civic and public facilities; resource/conservation lands. See tables for specific allowances.
Dimensions: Follow countywide defaults unless a planning area standard says otherwise; height is 45 ft (PF) and 25 ft (OS). § 22.10.090.

Important overlays and area standards that change the basics

Sensitive Resource Area/Highway Corridor: Can cap heights at 25 ft, require 100 ft scenic setbacks or screening, limit grading on steeper slopes, and require visual analysis or clustering. See § 22.10.095 and related area standards.
Planning Area/community standards: Many communities (e.g., San Miguel, Templeton, Nipomo, Avila Valley) add frontage, height, or landscaped parkway rules. Planning area standards control over base Title 22. § 22.01.033.

ADUs and development standards

Local standards cannot preclude at least one 800 sf ADU with 4 ft side and rear setbacks; local height caps for ADUs are 16–18–20 ft depending on transit/context. Always check if a parcel is in the Coastal Zone (Title 23). See State ADU law references for these overrides.

For broader state requirements and streamlining, see California ADU law and California housing laws. For construction and fire clearances, see the California Building Standards Code.

Related process notes

Official maps/land use categories are incorporated by reference into Title 22; the ordinance applies in the unincorporated inland area (Coastal parcels follow Title 23). § 22.01.030, § 22.01.050.
If your project cannot meet an objective dimensional rule, explore Variances and Exceptions. Existing nonconforming situations are handled under Nonconforming Uses.

Checklist

Identify land use category (district) and confirm parcel is outside the Coastal Zone (Title 22 vs. Title 23).
Confirm any planning area/community standards and overlay districts that may modify defaults (they control if conflicts exist).
Apply base setbacks: front (25 ft default or category-specific), side (lot-width rule), and rear (10/30 ft), including special rules for alleys and adjacent residential.
Check maximum building height for your category; confirm any overlay-based visibility/height caps.
For multi-family, determine intensity factor and ensure max floor area and minimum open area are met; document sewer and street context.
Confirm base residential density (one per parcel for RSF/RS/RR) or any area-standard density.
Apply parking location/design rules and any design review requirements early.
Ensure fencing/landscape within setbacks complies with Landscaping and Screening.
If proposing an ADU, apply state overrides (800 sf, 4-ft side/rear) and local objective standards that don’t unreasonably restrict ADUs.
If constraints remain, explore Variances and Exceptions and confirm any Nonconforming Uses implications.

Risks & Ambiguities

Issue	Why it matters	What to verify
Planning area overrides	Area/community standards can change setbacks, heights, or require landscaped parkways	Check the applicable planning area chapter; planning standards control if there’s a conflict (see § 22.01.033)
Overlay constraints (SRA/Highway Corridor)	Added slope/visibility/landscaping/height controls may apply	Whether parcel lies in an SRA or scenic corridor; see § 22.10.095 and mapped overlays
CBD exceptions	Front setbacks can be 0 ft in central business districts	Whether the site is inside a mapped CBD boundary (local plan) and if rear/side exceptions apply; see § 22.10.140.D.3, F.3
Multi-family “intensity factor”	Caps unit count, total floor area %, and requires open area	Street classification and sewer service; apply § 22.10.130.B table inputs
ADU preemption	State law guarantees at least one 800 sf ADU with 4-ft side/rear setbacks	Whether any local rule would preclude the state minimum; state ADU standards control (Gov. Code summarized)
Coastal vs. Inland code	Title 22 applies inland; Title 23 governs the Coastal Zone	Whether the parcel is in the Coastal Zone; if so, use Title 23 (not covered here)

Plain-English Summary

In the County’s unincorporated areas, expect a baseline 25 ft front setback, short side setbacks tied to lot width, and a 10–30 ft rear yard depending on lot size, plus a height cap that varies by district. Commercial/office sites in “downtown” areas can go to a 0 ft front setback, and multi-family sites have their own 20 ft front rule and “intensity” caps on floor area and open space. Local planning/overlay standards can be stricter, and state ADU rules can override some local limits.

Source References

Title 22 applicability and official maps: § 22.01.030; § 22.01.050
Conflict rule (planning standards control): § 22.01.033
Height limits and exceptions: § 22.10.090
Setbacks (front/side/rear; special lots/contexts; projections): § 22.10.140.D–H
Residential density (single-family base; multi-family intensity factor): § 22.10.130.A–B
Recreation category residential density detail: § 22.10.130.A.4
Community/overlay scenic corridor (Highway Corridor) examples: § 22.10.095 and related area standards excerpts
Allowable uses tables (selected excerpts for AG/RSF/RMF/CR/CS/IND etc.): Article 2 tables (snippets)
State ADU preemptions (setbacks, size, height): California ADU law summary (Gov. Code cited)

Sources

Retrieved passages

San Luis Obispo County Zoning Code (Chapter 22.22) High relevance
CBC § 66314 (§ 66314) Medium relevance
San Luis Obispo County Zoning Code (Title 19) Medium relevance
San Luis Obispo County Zoning Code (Section 22.70.020) Medium relevance
San Luis Obispo County Zoning Code (Title shall) Medium relevance
San Luis Obispo County Zoning Code (Title shall) Medium relevance
San Luis Obispo County Zoning Code (Section 22.06.030) Medium relevance
San Luis Obispo County Zoning Code (Article 9) Medium relevance
San Luis Obispo County Zoning Code High relevance
CBC § 22.10.090 (Section 22.10.090) High relevance
San Luis Obispo County Zoning Code (Title 22.) Medium relevance
San Luis Obispo County Zoning Code Medium relevance
San Luis Obispo County Zoning Code Medium relevance
San Luis Obispo County Zoning Code Medium relevance
San Luis Obispo County Zoning Code (Title 22) Medium relevance
San Luis Obispo County Zoning Code High relevance
San Luis Obispo County Zoning Code (Section 22.54.020.F.) High relevance
San Luis Obispo County Zoning Code (Chapter 6) High relevance
San Luis Obispo County Zoning Code (Section 22.06.030.) Medium relevance
San Luis Obispo County Zoning Code (Section 22.10.140.D.2.c) Medium relevance
CFC § 66314 (§ 66314) Medium relevance
San Luis Obispo County Zoning Code (Section 22.22.080.) High relevance
San Luis Obispo County Zoning Code (Section 22.06.030) High relevance
San Luis Obispo County Zoning Code (Chapter 22.22) Medium relevance
San Luis Obispo County Zoning Code (title 14) Medium relevance
San Luis Obispo County Zoning Code (Section 22.06.030) Medium relevance
San Luis Obispo County Zoning Code (Chapter 22.22) Medium relevance
San Luis Obispo County Zoning Code (Section 22.06.030) Medium relevance
San Luis Obispo County Zoning Code (Section 22.30.471.) Medium relevance
San Luis Obispo County Zoning Code (§ 6) High relevance
San Luis Obispo County Zoning Code (Section 22.70.030.) High relevance
San Luis Obispo County Zoning Code (Section 22.70.030) High relevance
San Luis Obispo County Zoning Code (Section 22.70.030.) Medium relevance
San Luis Obispo County Zoning Code (Chapter 22.16) Medium relevance
San Luis Obispo County Zoning Code (Title are) High relevance
San Luis Obispo County Zoning Code (Chapter 22.52) Medium relevance
San Luis Obispo County Zoning Code (Title 22.) Medium relevance
San Luis Obispo County Zoning Code (Section 22.30.410) Medium relevance

Cited sections

Official San Luis Obispo County code library

Frequently asked questions

What can I build on an RSF lot in unincorporated San Luis Obispo County?

Single-family homes and typical accessory uses are allowed; apply the base 25 ft front setback, side setbacks per the lot-width rule, a 10/30 ft rear yard (by lot size), and a 35 ft height limit unless a local standard is stricter. One primary dwelling per legal parcel is the base density unless a planning area standard says otherwise (those control). See § 22.10.140; § 22.10.090; § 22.10.130.A.3; § 22.01.033.

What are the County’s default setback rules in unincorporated areas?

Default front is 25 ft for structures taller than 3 ft; side is 10% of lot width (max 5 ft, min 3 ft) in urban/village areas; rear is 10 ft on lots <1 acre and 30 ft on lots ≥1 acre. Special contexts (multi-family, CBD, industrial, alleys, shallow/variable blocks, planned developments) have tailored rules. See § 22.10.140.D–F.

How tall can my building be?

Heights vary by category: Residential Single-Family/Rural/Suburban 35 ft; Multi-Family up to 40–45 ft (by intensity); Office & Professional 40 ft; Recreation 40 ft; Industrial 45 ft; Public Facilities 45 ft; Open Space 25 ft. Some overlays or community standards add tighter caps. See § 22.10.090 and applicable planning area standards.

Do I need to landscape or screen within setback areas?

Yes, required setback areas must remain unobstructed (over 3 ft structures are limited) and are subject to landscape and fencing standards; CBD and corridor/frontage plans often add detailed planting or parkway requirements. See § 22.10.140.C–D and community standards excerpts.

How are multi-family density and open space determined?

The County uses an “intensity factor” (based on street type and sewer service) to set maximum unit counts, cap total floor area as a percentage of usable site area, and require minimum open area. A 20 ft front setback also applies. See § 22.10.130.B and § 22.10.140.D.2.f.

Can commercial buildings sit on the sidewalk downtown?

In mapped central business districts, front setbacks can be 0 ft for commercial/office uses; elsewhere they are typically 10 ft. Rear and side adjacency and alley rules still apply. See § 22.10.140.D.3 and § 22.10.140.F.2–3.

Do ADU rules change setbacks or lot coverage?

Yes. State law guarantees at least one 800 sf ADU with 4-ft side and rear setbacks even if local lot coverage or FAR would otherwise preclude it, and sets objective height limits (generally 16–18–20 ft by context). See the State ADU law summary (Gov. Code cited).

I’m near a scenic corridor—do normal setbacks still apply?

Highway Corridor/Sensitive Resource Area standards can impose scenic 100 ft thresholds from corridors, limit visible massing/height (often 25 ft), and require landscaping/visual analysis. Those standards layer on top of the base setbacks and control if stricter. See § 22.10.095 and related area standards.

Do these standards apply in the Coastal Zone?