Zoning & permits in San Luis Obispo
What you can build on a lot in San Luis Obispo, how to find a property's zoning, and how projects get approved, from a garage conversion to an apartment building. Every rule links to the City or County code.
The short version
| First question | Is the property inside City limits? The City and the County have separate zoning codes, maps and permit counters. |
|---|---|
| City zoning map | City GIS maps (zoning and parcel info) · City Planning 805-781-7170 |
| County zoning map | Land Use View · County Planning & Building 805-781-5000 |
| Residential zones (City) | R-1 up to 7 units/acre · R-2 up to 12 · R-3 up to 20 · R-4 up to 24 |
| Small projects (City) | New single-unit homes and projects of 10 units or fewer get staff review with public notice, no hearing |
| Ready-now guides | Building an ADU · SB 9 lot splits & density bonus |
Step 1: Find the zoning for an address
- City or County? Addresses in the City of San Luis Obispo follow City zoning (Municipal Code Title 17). Addresses outside City limits, including places with an SLO mailing address, follow County rules, or another city's if they're in Arroyo Grande, Atascadero, Grover Beach, Morro Bay, Paso Robles or Pismo Beach.
- Inside the City: use the City's GIS planning maps for zoning and parcel information, or ask City Planning at 805-781-7170. The City encourages a pre-application meeting with staff before you apply for anything.
- Unincorporated county: use the County's Land Use View, its public interactive map of property and land use information.
City residential zones
The City has four residential zones. These are the base standards from the zoning code. Overlays, specific plans and state laws (ADUs, SB 9, density bonus) can allow more.
| Zone | Max density | Min lot | Max height | Front setback | Lot coverage |
|---|---|---|---|---|---|
| R-1 Low-Density Residential | 7 units/net acre | 6,000 sq ft | 25 ft | 20 ft | 40% |
| R-2 Medium-Density Residential | 12 units/net acre | 5,000 sq ft | 35 ft | 20 ft | 50% |
| R-3 Medium-High Density Residential | 20 units/net acre | 5,000 sq ft | 35 ft | 10 ft | 60% |
| R-4 High-Density Residential | 24 units/net acre | 5,000 sq ft | 35 ft | 10 ft | 60% |
- Side and rear setbacks grow with building height. They start at 5 feet for the lowest roof points; in R-1 they reach 11 feet at the 25-foot height limit.
- Street-side setback on corner lots is 10 feet in all four zones.
- R-1 floor area is capped at a 0.4 floor-area ratio, which can go to 0.5 in some cases.
- Minimum density per lot: every R-2 lot gets at least two density units and every R-3 lot at least three, whatever the lot's size (common-interest subdivisions excepted).
How "density units" work
Outside R-1, San Luis Obispo doesn't count homes one-for-one. It weighs them by size (Municipal Code 17.70.040):
| Home | Counts as |
|---|---|
| Studio or 1-bedroom under 600 sq ft | 0.5 density unit |
| 1-bedroom, 601–1,000 sq ft | 0.66 |
| 2-bedroom | 1 |
| 3-bedroom | 1.5 |
| 4+ bedrooms | 2 |
A lot's maximum is its net acreage times the zone's density. Example: a quarter-acre R-3 lot (0.25 × 20) allows 5 density units, which could be five 2-bedroom homes or ten small studios.
Other City zones and overlays
Besides the residential zones, the zoning code sets up agricultural, conservation/open space, office, public facility, five commercial zones (neighborhood, community, downtown, retail, tourist), service commercial, industrial and business park zones. On top of those sit overlay zones that add or change rules: Downtown, Specific Plan, Historic, Mixed-Use, Special Considerations, Special Focus and Planned Development.
Specific plan areas
Much of the City's newer housing is being built in areas with their own specific plans, which set the zoning, design and infrastructure for the whole area. The City's General Plan land use map lists six:
- Airport Area
- Margarita
- Orcutt
- Avila Ranch
- San Luis Ranch
- Madonna at Los Osos Valley Road (LOVR)
If you're buying in one of these areas, read its specific plan. It can differ from the citywide rules above.
Step 2: Getting a project approved (City)
Most projects need a building permit, and many also need a planning permit. How much review a project gets depends on its size (Municipal Code 17.106.030):
| Level | Typical projects | Who decides |
|---|---|---|
| Minor | A new single-unit home; up to 10 homes or mixed-use units; non-residential under 2,500 sq ft; minor additions | City staff, with public notice but no hearing |
| Moderate | 11–49 units; non-residential of 2,500–10,000 sq ft; larger additions and remodels | Community Development Director, after an Architectural Review Commission hearing |
| Major | 50+ units; non-residential over 10,000 sq ft; projects needing an environmental impact report | Planning Commission, on the Architectural Review Commission's recommendation |
| Legislative | Rezoning, General Plan amendments, specific plans, development agreements | City Council, on the Planning Commission's recommendation |
- Other permits (Municipal Code 17.102.020): the Director handles home occupation permits, reasonable accommodation and density bonus incentives. Minor use permits and variances also go to the Director, but with a public hearing. Conditional use permits go to the Planning Commission.
- When one project needs several approvals, the highest review authority decides all of them.
- How to apply: submit the City's Planning Application with the matching checklist and fee in person, by email to [email protected], or by mail to 919 Palm Street (City planning permits).
- Building permits go through the City's online permit portal (linked from the Building & Safety page). Most inspections can be scheduled online at infoslo.slocity.org; fire and demolition inspections are booked by phone at 805-781-7180.
Unincorporated SLO County
- The County handles zoning and permits for everywhere outside the seven cities, including Los Osos, Cambria, Cayucos, Avila Beach, Templeton, Nipomo, Oceano and rural areas.
- Permits are filed online through PermitSLO, which handles both planning applications and construction permits.
- Coastal areas follow the County's coastal zone rules, which often require more review (for example, a Minor Use Permit for some uses that are simpler inland).
- County Planning & Building is at the County Government Center, 1055 Monterey Street, San Luis Obispo; phone 805-781-5000.
Related guides
Building an ADU in San Luis Obispo
Sizes, height, setbacks, parking, renting, fees and the permit process, with 2026 state law changes.
Read →SB 9 lot splits & density bonus
Splitting a single-family lot, adding units, and building more with affordable homes.
Read →Questions people ask
How do I find the zoning for a property in San Luis Obispo?
First check whether the address is inside City limits. For City properties, use the City's GIS zoning and parcel maps or call City Planning at 805-781-7170. For unincorporated county properties, use the County's Land Use View map or contact County Planning & Building at 805-781-5000.
What does R-1 zoning allow in San Luis Obispo?
R-1 (Low-Density Residential) allows up to 7 units per net acre on lots of at least 6,000 square feet, with a 25-foot height limit, 20-foot front setback and 40% maximum lot coverage. State law also allows ADUs, junior ADUs and, on many lots, SB 9 lot splits.
What is a density unit in San Luis Obispo?
Outside R-1, SLO counts homes by size: a studio or one-bedroom under 600 sq ft is 0.5 density units, a one-bedroom of 601–1,000 sq ft is 0.66, a two-bedroom is 1, a three-bedroom is 1.5 and four or more bedrooms is 2. A lot's maximum is its net acreage times the zone's density.
Do I need a permit to remodel in San Luis Obispo?
The City requires a building permit before construction or alteration, and some projects also need a planning permit. New single-unit homes and small projects get staff-level review with public notice but no hearing; larger projects go to the Architectural Review Commission or Planning Commission.
Official sources
- City of SLO Municipal Code Title 17: Zoning Regulations
- 17.06.020: Zones established
- 17.16.020: R-1 standards · R-2 · R-3 · R-4
- 17.70.040: Density
- 17.106.030: Levels of development review
- 17.102.020: Discretionary actions and permits
- City of SLO General Plan Land Use Element map (2020)
- City of SLO: Planning & Zoning · Planning permits · Building & Safety
- County of SLO: Land Use View · PermitSLO
General information, not legal or design advice. Zoning standards have exceptions, overlays and state-law overrides. Confirm what applies to a specific property with City Planning or County Planning & Building before you buy or design. Last reviewed October 8, 2026.