Commercial Real Estate in St. Helena: Main Street, Formula Business Limits and Highway 29 Zoning

By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.

St. Helena’s commercial property runs along Main Street (State Route 29) through downtown, with service commercial, office and light industrial land toward the edges of town and wineries on the county land that surrounds it. The city rewrote its zoning code under Ordinance 23-4, and the new code puts tight limits on chain businesses, building size and tourist-only uses. Confirm the zone, overlays and permit history for every parcel with the City of St. Helena before relying on this page.

Who controls the parcel

Inside city limits, St. Helena’s Title 17 Zoning Code governs. Each district chapter cites Ordinance 23-4, the comprehensive update. The vineyards, wineries and hillsides outside town are unincorporated Napa County land under the county’s agricultural zoning and winery rules; see our Napa County commercial guide.

Two more layers can apply within the city. Overlay districts in Chapter 17.21 add flood, historic, parking and planned development rules. Projects inside the Highway 29 Specific Plan area must also meet that plan, according to the design standards in Chapter 17.17.

St. Helena zoning for commercial, industrial and mixed use

District	Intended uses	Notes
CB Central Business	Downtown retail, services, offices, restaurants and lodging for residents and visitors; ground-floor shops with offices and homes above	FAR 2.0 including housing. 35 ft on Main Street. 10,000 sq ft per building on the Main Street corridor south of Adams
SC Service Commercial	Auto-oriented and larger-footprint uses along the SR 29 corridor, mainly serving locals	Strictly tourist-serving retail prohibited. FAR 0.50. 10,000 sq ft lots
MU Mixed-Use	Housing combined with retail, office and restaurants	Up to 20 units per acre. FAR 1.0. Three stories
BPO Business and Professional Office	Professional, medical and administrative offices, R&D, banks	FAR 0.50. 30 ft. Upper-floor housing by CUP
I Industrial	Warehouses, light manufacturing, farm equipment, winery support	FAR 0.50 (0.60 if mostly warehousing). 45 ft, 35 ft near homes. 20,000 sq ft lots

The code uses three permit levels: P (permitted), MUP (a staff-level minor use permit) and CUP (a conditional use permit with a public hearing).

Main Street and the Central Business district

By right. General retail, personal services, offices, counter-service restaurants and brewpubs are permitted in CB.

Minor use permit. Full-service restaurants and bed and breakfast inns need an MUP. A grocery store needs one too and may not include seating.

Conditional use permit. These CB uses need a CUP:

bars, liquor stores and micro-breweries or distilleries
winery tasting rooms
hotels, which on Main Street are limited to upper floors
multifamily and single-room occupancy housing, upper floors only
service stations and time shares

Building form. Main Street buildings must face the street with the primary entrance on it, and street walls need 70% transparency between 2 and 7 feet. Front setbacks on Main Street are capped at 5 feet (8 with an active frontage). The height limit is 35 feet on Main Street, 46 feet off it, and 30 feet near homes on Oak Street.

Parking. The Parking Exemption District, generally within CB, waives on-site parking and in-lieu fees for older buildings, but existing spaces must be kept. A note says the section will change after a downtown parking study, so ask the city where that stands.

Formula businesses, tasting rooms and other St. Helena rules

Formula businesses. Formula restaurants and drive-through restaurants are not permitted. Formula retail needs a CUP in CB and MU and is permitted in SC. The table footnote caps formula retail at four businesses per zoning district. Under Section 17.22.120, the Planning Commission must find the business supports a balanced commercial mix and fits the town’s historic character.

Tasting rooms and bars. Section 17.22.050, amended by Ordinance 26-2, requires a CUP for tasting rooms, bars, brewpubs and micro-producers and limits hours to 6 a.m. to 2 a.m. In all three commercial districts, music audible outside the building and drive-in service are barred, and rooftop uses are allowed only in CB and MU.

Wineries in town. Large wineries are allowed in the I district by CUP but without retail sales or tasting. Wine warehousing also needs a CUP.

Historic overlay. Parcels on the HP map need design review. New infill must stay within 20% of the average height of adjacent buildings, and additions visible from the street or adding more than 25% floor area need major design review.

Flood and creek setbacks. The flood plain overlay bars hospitals, emergency facilities and similar uses in the 100-year flood plain and sets no-build setbacks of 50 feet from the Napa River and 20 feet from Sulphur Springs Creek.

Short-term rentals. St. Helena allows them only under Section 17.22.200: one per lot, in a single-family home, with an owner-held, non-transferable permit and a citywide cap of 25 permits.

Transfer tax, business tax and property tax

St. Helena’s real property transfer tax is 27.5 cents per $500 of consideration over $100, administered by the County Recorder. Napa County’s document transfer tax page states a combined $0.55 per $500 and says half goes to the city where the property sits, so the city tax appears to be part of that total. Confirm the figure on the escrow estimate.

New nonresidential space pays a housing impact fee under Chapter 17.30, with the amount set in the master fee schedule. Wineries are among the exemptions. The city also has business license (Title 5) and transient occupancy tax (Chapter 3.28) chapters; confirm current rates with the city. A sale generally triggers Proposition 13 reassessment.

Due diligence that matters in St. Helena

Start with our commercial due diligence checklist, then add:

Confirm the zone and the permit level (P, MUP or CUP) for the intended use.
For a chain tenant, count the formula retail businesses already in that district.
Pull CUPs for any tasting room, bar, hotel or upper-floor housing.
Check the HP and flood plain overlays and the river and creek setbacks.
Confirm whether the building sits in the Parking Exemption District.
Check the Highway 29 Specific Plan if the parcel is in its area.
Ask for the current housing impact fee if you plan to add floor area.

Questions people ask

Can a chain restaurant open in St. Helena?

No. Formula restaurants and drive-through restaurants are not permitted in the commercial districts.

How many formula retail stores are allowed?

The code caps formula retail at four per zoning district, and in CB and MU each one needs a CUP with Planning Commission findings.

Does a tasting room need a permit?

Yes. Tasting rooms need a CUP in CB, SC and MU, with hours limited to 6 a.m. to 2 a.m.

Can tourist shops locate on the Highway 29 service corridor?

Not if they are strictly tourist-serving. The SC district is meant for locally oriented and auto-oriented uses.

How big can a downtown building be?

On the Main Street corridor south of Adams Street, 10,000 square feet per building, at FAR 2.0 and 35 feet.

Is there a St. Helena transfer tax?

Yes, 27.5 cents per $500, which the County describes as the city’s half of a combined $0.55 per $500.

Does Diamond handle commercial property in St. Helena?

Contact Matthew Martinez to discuss buying, selling or leasing commercial property in St. Helena.

Sources & notes

Note: Some setback cells in the Chapter 17.17 and 17.18 tables are garbled in the published copy; confirm them with the city. We did not review the Highway 29 Specific Plan, the small winery section (17.22.230), the TOT or business license chapters, or the current fee schedule.

This page is general information, not legal or tax advice. Last reviewed October 2026 by Matthew Martinez.

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