Napa County · Zoning setbacks
Unincorporated Napa County setback requirements
Lekua resolves a parcel’s jurisdiction and zone, then draws this envelope on the site plan with its citation in the title block. Enter a Unincorporated Napa County address and the setbacks arrive already drawn.
The envelope
What the numbers below make on the ground. Shown for the first district in the table; the rest follow the same geometry at their own dimensions.
Zone RS — the envelope Lekua draws on the plan.
- Front
- 20′
- Side
- 6′
- Rear
- 20′
The hatched band is the yard — ground the code gives up. Drawn not to scale: the yards are proportional to each other, so the deepest one fills the band and the rest follow. The dimensions carry the real numbers, and the export draws them on the actual parcel outline.
Unincorporated Napa County setbacks by district
Every row is produced by the same function the exporter calls, so this page cannot drift from what the drawing gets. The citation under each row is what prints on the sheet.
Corner lots: 10′ on the secondary street frontage.
Napa County Code Table 18.104.010 (RS Residential Single): front 20, interior side 6 (footnote C), street side 10 (corner, footnote C), rear 20. Napa County Code Table 18.104.010 (Ord. 1495 §36, 9-24-2024), captured 2026-08-19. IMPORTANT — ROAD SETBACKS ARE ADDITIONAL AND ARE NOT DRAWN: §18.08.650 starts the front yard at the outer perimeter of the Chapter 18.112 road setback, and §18.112.030 measures THAT from the ROAD CENTERLINE, not from your property line. Ch. 18.112 (captured 2026-08-19) sets 70 ft on State Routes 12/29/121/128, Stanly Lane and the Silverado Trail (§§18.112.040-060); 42 ft on 19 named arterial county roads (§18.112.070); 30 ft on 100 named collector county roads (§18.112.080); 28 ft on any other public road (§18.112.090) and on private roads other than a driveway serving only its own parcel (§18.112.100); reduced to 40 ft through Oakville and Rutherford on SR 29 and 30 ft near Rutherford on SR 128 (§18.112.110). Where the setback measured from the centerline reaches past the front property line, the yard above starts there instead — on an arterial or state highway that can add tens of feet. Berryessa Highlands Units I & II and Lake Berryessa Estates Unit II are exempt from road setbacks entirely (§18.112.115). Identify the fronting road and its class before layout. Corner lots take the SHORTEST street frontage as the front (§18.08.190). Footnote C adds 3 ft to each side yard per storey above the first. Parcels in the Berryessa Highlands Subdivision Units I & II take a 10 ft front (§18.104.010.E) — not detectable from the zone code, verify. Verify with Napa County PBES.
Corner lots: 10′ on the secondary street frontage.
Napa County Code Table 18.104.010 (RM Residential Multiple): front 20, interior side 6 (footnote C), street side 10 (corner, footnote C), rear 20. Napa County Code Table 18.104.010 (Ord. 1495 §36, 9-24-2024), captured 2026-08-19. IMPORTANT — ROAD SETBACKS ARE ADDITIONAL AND ARE NOT DRAWN: §18.08.650 starts the front yard at the outer perimeter of the Chapter 18.112 road setback, and §18.112.030 measures THAT from the ROAD CENTERLINE, not from your property line. Ch. 18.112 (captured 2026-08-19) sets 70 ft on State Routes 12/29/121/128, Stanly Lane and the Silverado Trail (§§18.112.040-060); 42 ft on 19 named arterial county roads (§18.112.070); 30 ft on 100 named collector county roads (§18.112.080); 28 ft on any other public road (§18.112.090) and on private roads other than a driveway serving only its own parcel (§18.112.100); reduced to 40 ft through Oakville and Rutherford on SR 29 and 30 ft near Rutherford on SR 128 (§18.112.110). Where the setback measured from the centerline reaches past the front property line, the yard above starts there instead — on an arterial or state highway that can add tens of feet. Berryessa Highlands Units I & II and Lake Berryessa Estates Unit II are exempt from road setbacks entirely (§18.112.115). Identify the fronting road and its class before layout. Corner lots take the SHORTEST street frontage as the front (§18.08.190). Footnote C adds 3 ft to each side yard per storey above the first. Parcels in the Berryessa Highlands Subdivision Units I & II take a 10 ft front (§18.104.010.E) — not detectable from the zone code, verify. Verify with Napa County PBES.
Corner lots: 20′ on the secondary street frontage.
Napa County Code Table 18.104.010 (AP Agricultural Preserve): front 20, rear 20; side 20 ft — base table. Napa County Code Table 18.104.010 (Ord. 1495 §36, 9-24-2024), captured 2026-08-19. IMPORTANT — ROAD SETBACKS ARE ADDITIONAL AND ARE NOT DRAWN: §18.08.650 starts the front yard at the outer perimeter of the Chapter 18.112 road setback, and §18.112.030 measures THAT from the ROAD CENTERLINE, not from your property line. Ch. 18.112 (captured 2026-08-19) sets 70 ft on State Routes 12/29/121/128, Stanly Lane and the Silverado Trail (§§18.112.040-060); 42 ft on 19 named arterial county roads (§18.112.070); 30 ft on 100 named collector county roads (§18.112.080); 28 ft on any other public road (§18.112.090) and on private roads other than a driveway serving only its own parcel (§18.112.100); reduced to 40 ft through Oakville and Rutherford on SR 29 and 30 ft near Rutherford on SR 128 (§18.112.110). Where the setback measured from the centerline reaches past the front property line, the yard above starts there instead — on an arterial or state highway that can add tens of feet. Berryessa Highlands Units I & II and Lake Berryessa Estates Unit II are exempt from road setbacks entirely (§18.112.115). Identify the fronting road and its class before layout. Corner lots take the SHORTEST street frontage as the front (§18.08.190). Footnote C adds 3 ft to each side yard per storey above the first. Parcels in the Berryessa Highlands Subdivision Units I & II take a 10 ft front (§18.104.010.E) — not detectable from the zone code, verify. Verify with Napa County PBES.
Corner lots: 20′ on the secondary street frontage.
Napa County Code Table 18.104.010 (AW Agricultural Watershed): front 20, rear 20; side 20 ft — base table. Napa County Code Table 18.104.010 (Ord. 1495 §36, 9-24-2024), captured 2026-08-19. IMPORTANT — ROAD SETBACKS ARE ADDITIONAL AND ARE NOT DRAWN: §18.08.650 starts the front yard at the outer perimeter of the Chapter 18.112 road setback, and §18.112.030 measures THAT from the ROAD CENTERLINE, not from your property line. Ch. 18.112 (captured 2026-08-19) sets 70 ft on State Routes 12/29/121/128, Stanly Lane and the Silverado Trail (§§18.112.040-060); 42 ft on 19 named arterial county roads (§18.112.070); 30 ft on 100 named collector county roads (§18.112.080); 28 ft on any other public road (§18.112.090) and on private roads other than a driveway serving only its own parcel (§18.112.100); reduced to 40 ft through Oakville and Rutherford on SR 29 and 30 ft near Rutherford on SR 128 (§18.112.110). Where the setback measured from the centerline reaches past the front property line, the yard above starts there instead — on an arterial or state highway that can add tens of feet. Berryessa Highlands Units I & II and Lake Berryessa Estates Unit II are exempt from road setbacks entirely (§18.112.115). Identify the fronting road and its class before layout. Corner lots take the SHORTEST street frontage as the front (§18.08.190). Footnote C adds 3 ft to each side yard per storey above the first. Parcels in the Berryessa Highlands Subdivision Units I & II take a 10 ft front (§18.104.010.E) — not detectable from the zone code, verify. Verify with Napa County PBES.
What the export says about this table
Napa County yards are Table 18.104.010 (Ord. 1495, 9-24-2024): agricultural and residential-country districts 20/20/20, residential-single and multiple 20/6/20 with a 10 ft corner street side. Parcels of two acres or less in the agricultural and residential-country districts take the residential-single side yards, and lots under sixty feet wide take a five-foot side. ROAD SETBACKS UNDER CHAPTER 18.112 ARE ADDITIONAL AND ARE NOT SHOWN: they are measured from the road centerline (70 ft on state highways and the Silverado Trail, 42 ft on arterial county roads, 30 ft on collectors, 28 ft on other public and private roads), and the yard above begins at their outer edge. Identify the fronting road and its class, and confirm with Napa County PBES, before layout. The five-foot narrow-lot side yard depends on a lot width ESTIMATED from parcel area and perimeter, while the code measures width at the building setback line; confirm against the assessor map before relying on it. Yards shown govern the MAIN BUILDING: detached accessory buildings, mechanical equipment and accessory dwelling units may lawfully stand closer (s18.104.140, s18.104.180).
Printed verbatim on every Unincorporated Napa County export — the same words the reviewer signed off, not a summary of them.
Setbacks are one layer of a Unincorporated Napa County site plan
The same address search returns the parcel boundary, 1–2 ft contours, building footprints, CAL FIRE defensible-space zones, the soil profile, four-season sun, and a native plant palette matched to the site. See everything Lekua resolves in Napa County→
Unincorporated Napa County setback FAQ
What are the residential setbacks in Unincorporated Napa County?
In RS the code sets a 20 ft front yard, 6 ft sides, and a 20 ft rear yard. The full table is below, transcribed from Napa County Code Table 18.104.010 with the citation attached to every row. This table has passed independent review, so Lekua draws the setback envelope on the site plan for a Unincorporated Napa County parcel.
Does Lekua draw the setback envelope for Unincorporated Napa County?
Yes. Unincorporated Napa County is one of the jurisdictions whose table has passed review, most recently on 2026-08-19, so the envelope is drawn on the DXF and the PDF site plan with its citation in the title block.
Where do these Unincorporated Napa County setback numbers come from?
They are transcribed from the adopted code — Napa County Code Table 18.104.010 — and this page renders them by calling the same function the exporter calls, so what you see here is what the drawing gets. Zoning changes; verify against the current code and with the planning department before submittal.
Can I get a CAD base map for a Unincorporated Napa County parcel?
Yes. Enter any Unincorporated Napa County address and Lekua returns a layered DXF base plan and a PDF site report — property lines, 1–2 ft contours, building footprints, CAL FIRE defensible-space zones, soil, seasonal sun, and a native plant palette matched to the parcel, alongside the zoning determination. See what else resolves in Napa County.
Start with a Unincorporated Napa County address
Free to search. The zone resolves from the parcel, not from the mailing address.