You have found the space — a corner storefront in the Outer Sunset, next to a dry cleaner and a small market, with flats above. You want to knock the two ground-floor units together and put a mezzanine in the back. Then the planner mentions the one-story limit, and the use size cap, and asks whether the rear yard is intact at every level. All three answers are in a single page of the code.
The short answer: NC-1 is San Francisco's Neighborhood Commercial Cluster district — the small corner-cluster shopping zone. Commercial development is limited to one story, use size is generally capped around 3,000 square feet, the rear yard must be preserved at every level, no car parking is required, and housing above the ground floor is encouraged (§ 710).
Key numbers
| Control | NC-1 | Source |
|---|---|---|
| Commercial stories | One story | § 710 |
| Use size, retail sales and services | Generally limited to 3,000 sq ft | § 710 |
| Height and bulk | Varies, but generally 40 feet; height sculpting required on alleys | § 710 |
| Rear yard | 25% of lot depth, never less than 15 feet, required at grade and at each succeeding level | § 710 |
| Front setback and side yard | Not required | § 710 |
| Usable open space per dwelling unit | 100 sq ft private, or 133 sq ft common, or the amount required in the nearest residential district — whichever is less | § 710 |
| Car parking | None required; a maximum applies instead | § 710 |
| Car share spaces | Required once a project has 50 units or more | § 710 |
| Dwelling unit mix | Generally required for 10 or more units, with a minimum share of larger units | § 710 |
What the district is for
San Francisco's zoning map is not one system. Residential districts are named for building type — houses, mixed, transit-oriented — while the Neighborhood Commercial districts describe the shopping street itself and are graded by intensity. NC-1 is the smallest of them.
The code's own description is unusually plain about what it is looking at: these districts are located inside residential neighborhoods, often in outlying parts of the city, and many have the lowest intensity of commercial development anywhere in San Francisco — typically small clusters of three or more commercial establishments grouped around a corner, and in some cases short, low-scale linear strips with housing mixed in.
The stated purpose is daytime convenience: local shopping for the immediately surrounding blocks. Every control below follows from that sentence.
One story, and the backyard survives
Two rules do most of the work in NC-1, and they are stated together:
"Commercial development is limited to one story. Rear yard requirements at all levels preserve existing backyard space." (§ 710)
The one-story limit is what keeps a corner store from becoming a two-level shop with the neighbors' bedrooms across the light well. It is a limit on the commercial use, not on the building — housing above is a separate and encouraged thing.
The rear yard is the more restrictive of the two in practice. It is 25% of lot depth and never less than 15 feet, and — this is the phrase that surprises people — it is required at grade level and at each succeeding level or story. You cannot build out to the back at ground level and then cantilever the floors above over that footprint. The mid-block open space runs up the full height of the building.
Front setbacks and side yards, by contrast, are not required. NC-1 buildings are meant to meet the sidewalk, which is exactly what a shopping street needs.
Height generally runs to about 40 feet, varying by the height and bulk map, with height sculpting required on alleys so buildings step down where they face a narrow lane. Some districts allow a 5-foot height bonus for active ground floor uses.
What you may open — and what you may not
The use provisions encourage the full range of neighborhood-serving convenience retail sales and services at the first story, with use size generally capped around 3,000 square feet. Think of the scale as a market, a laundry, a small restaurant, a barber — not a supermarket or a big-box tenant.
The prohibitions are where the district's character is really enforced. The code excludes uses and features that could affect residential livability, naming:
- Auto uses
- Financial services
- General advertising signs
- Drive-up facilities
- Hotels
- Late-night activity
Eating and drinking establishments are restricted rather than banned — how restricted depends on the intensity of such uses in nearby commercial districts, so the answer varies by block rather than being fixed citywide.
Small details follow the same logic. Awnings are permitted; canopies and marquees are not. Signs are limited to what the sign provisions allow, and general advertising signs — billboards — are not permitted at all. Street frontage controls apply to above-grade parking setbacks, parking and loading entrances, active uses, ground-floor ceiling height, street-facing ground-level spaces, transparency and fenestration, and gates, railings and grillwork, with exceptions available for historic buildings. Ground-floor commercial is required outright on some streets.
Housing in NC-1 is protected, not just permitted
Housing development in new buildings is encouraged above the ground story in most NC-1 districts, and accessory dwelling units are permitted within the district.
Existing residential units get two specific protections: conversions above the ground story are prohibited, and demolitions are limited. So the flats over the corner store cannot be turned into offices, and cannot be easily removed.
Where housing is built, three residential controls apply:
- Usable open space per dwelling unit is 100 square feet if private, 133 square feet if common, or the amount required in the nearest residential district — whichever of those is less.
- Parking is not required at all; the code sets a maximum instead, requires bicycle parking, and requires car share spaces once a project reaches 50 units.
- Dwelling unit mix is generally required for projects creating 10 or more units, setting a floor on the share of larger units so the district does not fill up entirely with studios.
How NC-1 relates to its neighbors on the map
NC-1 is the bottom rung of a ladder. The small-scale neighborhood commercial district (§ 711) and the moderate-scale district (§ 712) sit above it, allowing more intensity and a wider range of uses on busier commercial streets.
Running alongside is a parallel transit family. The neighborhood commercial transit cluster district (§ 750) covers comparable clusters in places well served by transit, written around housing density and reduced car dependence rather than around the daytime convenience cluster.
And NC-1's influence reaches beyond its own boundaries. In the city's residential transit-oriented districts, small neighborhood retail is permitted on corner lots only, and the code defines what qualifies by pointing at this district: only retail compatible with housing, generally the uses permitted in NC-1 districts, with auto-oriented uses excluded, restricted hours, and no off-street parking for those uses (§ 209.4). NC-1 is effectively the city's definition of "corner store scale."
Before you sign a lease
The zoning district is only the first filter. Several controls above are explicitly block-by-block — which streets require ground-floor commercial, which restrict vehicular access, how heavily eating and drinking uses are limited near you — and none of that is visible from the district name alone.
The reliable sequence is to confirm the parcel's district and height and bulk designation, then check the specific street controls for that frontage, then confirm your intended use against the district's use table before committing. Start from the San Francisco jurisdiction page if you need the surrounding rules.
Sources
- San Francisco Planning Code § 710 — NC-1, Neighborhood Commercial Cluster District
- San Francisco Planning Code § 711 — NC-2, Small-Scale Neighborhood Commercial District
- San Francisco Planning Code § 712 — NC-3, Moderate-Scale Neighborhood Commercial District
- San Francisco Planning Code § 750 — NCT-1, Neighborhood Commercial Transit Cluster District
- San Francisco Planning Code § 209.4 — RTO, Residential Transit Oriented Districts
