Zoning › California › Napa County › Napa

Napa, CA Zoning

Euclidean-zoning. 11 districts · 9 overlays · 6 applicable state preemptions.

Overview

Code type
euclidean
Naming convention
use-type-index

Base district codes are two-letter use-type tokens (RS, RI, RT, RM residential; CL, CT, CC, DCC, DMU, DN, OBC commercial; I industrial; P/PQP public). Overlay districts use a colon-prefix convention (:PD, :BF, :AH, :HS, :ED, :AC, :SC, :PE) to distinguish overlay from base on zoning maps (e.g., 'RM:AH' = Multifamily Residential with Affordable Housing overlay). Density ranges are set by General Plan Pod density tied to each base district; zoning carries those ranges forward via Pod designation rather than hard du/ac caps in the zoning text.

Worth knowing

+ 5 more in Quirks & notes

Districts

com 5res_sf 3mu 2res_mf 1
CodeNameCategory Min lotHeight CoverageFAR Du/acParking Setbacks F/S/R
RSSingle-Family Residentialres_sf5,000 sf[4]35 ft[5]——8[6]2[7]20[1] / 5[2] / 15[3]
RISingle-Family Infillres_sf5,000 sf[11]35 ft[12]——12[13]2[14]15[8] / 5[9] / 10[10]
RTTraditional Residential Infillres_sf4,000 sf[18]30 ft[19]——12[20]1[21]10[15] / 3[16] / 10[17]
RMMultifamily Residentialres_mf6,000 sf[25]45 ft[26]——40[27]1.5[28]15[22] / 10[23] / 15[24]
CLLocal Commercialcom—35 ft[32]—0.5[33]——10[29] / 0[30] / 10[31]
CTTourist Commercialcom—45 ft[37]—1[38]——10[34] / 0[35] / 10[36]
CCCommunity Commercialcom—45 ft[42]—1[43]——10[39] / 0[40] / 10[41]
DCCDowntown Core Commercialcom—65 ft[47]—3[48]40[49]—0[44] / 0[45] / 0[46]
DMUDowntown Mixed Usemu—55 ft[53]—2.5[54]40[55]—5[50] / 0[51] / 5[52]
DNDowntown Neighborhoodmu—45 ft[59]—1.5[60]30[61]—5[56] / 0[57] / 10[58]
OBCOxbow Commercialcom—55 ft[65]—2[66]——5[62] / 0[63] / 10[64]

Confidence: confirmed partial under review not found

Overlays

:BF
Building Form Overlay
DSP
BMC §17.35 · c§17.35
:AH
Affordable Housing Overlay
AH
BMC §17.37 · c§17.37
:HS
Hillside Overlay
HS
BMC §17.40 · c§17.40
:PD
Planned Development Overlay
PD
BMC §17.42 · c§17.42
:ED
Entertainment Overlay
SPD
BMC Title 17 (overlay chapter) · p§17 (ED chapter)
:AC
Airport Compatibility Overlay
AICUZ
BMC §17.33 (airport compatibility overlay chapter) · c§17.33
:SC
Soscol Corridor Overlay
COR
BMC §17.46 · c§17.46
:PE
Parking Exempt Overlay
SPD
BMC §17.44 · c§17.44
:AF
Active Frontage Overlay
FORM
City of Napa interim zoning ordinance (referenced on cityofnapa.org Zoning Information page) · p (Interim Ord., Active Frontage)

State preemptions

CA-ADU-GC§66411.7-66411.8applies
Qualifying condition
All CA cities. Napa's RS, RI, RT, RM, and mixed-use districts must permit ADUs by right per state law. RS district explicitly permits ADUs per §17.08.010.
CA-SB9-GC§65852.21-66411.7applies
Qualifying condition
Napa is a CA general-law city with single-family districts (RS, RI, RT). SB 9 applies per-parcel conditional on exclusions. Napa has FEMA SFHA in the Napa River corridor (parcel-specific exclusion), identified hillside areas (HS overlay at ≥15% slope) that partially overlap with CalFire VHFHSZ (per-parcel), and historic neighborhoods (RT district) — but Napa has no designated historic district in Title 17 that would categorically exclude SB 9 (historic neighborhoods are a use-type designation, not a Mills-Act / National Register district excluded by statute). Napa is an inland city — no coastal zone.
CA-DensityBonus-GC§65915applies
Qualifying condition
Statewide. Applies to any Napa project meeting affordability thresholds (5% VLI, 10% LI, 10% moderate for-sale, or 100% affordable). AB 1287 allows stacking up to 100% density bonus. Stacks with :AH overlay density floor (which raises minimum not maximum).
CA-AB2097applies
Qualifying condition
Napa is served by Vine Transit (operated by Napa Valley Transportation Authority) with downtown Napa Transit Center at Pearl/Soscol and Route 29 Napa VINE Express to Vallejo/BART. Whether Vine stops qualify as 'major transit stop' under PRC §21064.3 depends on 15-min peak headway at bus-intersection qualifying corridors. Downtown Napa Transit Center and the Wine Train station (if rail service qualifies) may anchor qualifying buffers. Napa County Airport does NOT qualify (not a transit stop).
CA-SB423-GC§65913.4applies
Qualifying condition
SB 423 applies to sites zoned residential or mixed-use in cities not meeting their RHNA share OR HCD-non-compliant. Napa's 6th-cycle Housing Element (2023–2031, ABAG allocation, RHNA 2,669 units) is HCD-certified as of 2023-12-05. Applies to RS/RI/RT/RM, DCC/DMU/DN/OBC corridor parcels (per AB 2011 overlap). CalFire VHFHSZ and recent tenant-displacement sites excluded.
Retrieval issue
HCD APR dashboard is JS-rendered; not fetchable within budget.
CA-AB2011-GC§65912.100applies
Qualifying condition
Napa has commercially-zoned parcels along defined corridors (Soscol Ave, Imola Ave, Trancas St, First St, Silverado Trail within city limits) that may qualify as 'commercial corridors' under AB 2011. 100% affordable projects by-right on any commercial site; mixed-income by-right on corridor sites (excludes industrial-only and office-only).
Non-applicable laws (2)
CA-BuildersRemedy-GC§65589.5(d)(5)confirmed
Qualifying condition
Napa's 6th-cycle Housing Element (2023–2031) was HCD-certified on 2023-12-05 (adopted 2023-10-17). While HCD certified, Builder's Remedy is DORMANT for this cycle. If Napa falls out of compliance (e.g., fails annual APR or rezone commitments), Builder's Remedy re-activates.
CA-SB10not_applicable
Qualifying condition
SB 10 is permissive — authorizes but does not require cities to zone up to 10 units/parcel near transit or urban infill via simple resolution (CEQA-exempt). No evidence Napa City Council has adopted an SB 10 resolution; 2040 General Plan (adopted 2022-10-18) relies on standard rezone path.

Adopted building codes

Statewide mandatory minimum

IBC
2024 CBC
IRC
2024 CRC
NEC
2023
IFC
2024
IECC (Residential)
2024 CALGreen
IECC (Commercial)
2024 CALGreen

Click a code label to open its state-by-state adoption atlas.

Quirks & notes

Formulas

Definitions

height
Measured per CA Building Code from grade to highest point; BF overlay uses Downtown Specific Plan Section 4.7.2 Building Form Zones to set height within the DSP area (overrides base).
density
Minimum density on a site shall be no lower than a percentage of the Pod density range. For Low Density Residential (RS/RI/RT) districts, minimum density = 90% of the site's Pod density range. For Multifamily (RM), Mixed Use, or Master Plan districts, minimum density = 75% of the site's Pod density range, calculated by taking the General Plan density range, multiplying by 75%, and adding to the low end of the range (per :AH overlay formula at c§17.37). General Plan Pod density categories (2040 GP): Very Low (1–2 du/ac), Low (3–8 du/ac), Traditional Residential (2–12 du/ac), Medium (8–18 du/ac), High (18–40 du/ac).
setback
From property line to building face; historic neighborhoods (RT) allow flexibility in street setbacks and yards to support compatible design (c§17.08).
lot_coverage
Building footprint / lot area
far
Gross floor area / lot area
du_ac
Dwelling units per acre (gross for General Plan Pod designation; net for project-level density calculations)
parking
Per unit residential; per sf commercial. AB 2097 eliminates minimums within 1/2 mile of major transit.

Capacity calculations

ah_overlay_min_density_low_density
site_pod_density_range.low * 0.90 (c§17.37 :AH Affordable Housing Overlay)
ah_overlay_min_density_mf_mu_mp
site_pod_density_range.low + (site_pod_density_range * 0.75) (c§17.37)
max_footprint_sf
lot_area_sf * lot_coverage
max_gfa_sf
lot_area_sf * far
buildable_width_ft
lot_width_ft - setback_side_ft * 2
buildable_depth_ft
lot_depth_ft - setback_front_ft - setback_rear_ft

Massing explorer

Interactive 3D comparison across every district. Drag to orbit, scroll to zoom, use the slider to walk districts, and toggle applicable overlays in the right-side panel.

—
—
Sort by —
LOW
HIGH
drag to orbit · scroll to zoom
Max height
— ft
——
Floor area ratio
—
——
Lot coverage
—%
——
Setbacks (F / S / R)
— ft
——
Parking
— /unit
——
Max density
— du/ac
——
Min lot size
— sf
——
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District Category Height FAR Coverage Setbacks Parking Density Min lot Overlays

Sources & references

Primary source
Title 17 — Zoning, City of Napa Municipal Code
eCode360 current supplement; aligned with 2040 General Plan (adopted 2022-10-18) and 6th-cycle Housing Element (HCD-certified 2023-12-05) · retrieved 2026-04-19
Citations
  1. [1] §17.08.030
  2. [2] §17.08.030
  3. [3] §17.08.030
  4. [4] §17.08.030
  5. [5] §17.08.030
  6. [6] §17.08.010
  7. [7] §17.52
  8. [8] §17.08.030
  9. [9] §17.08.030
  10. [10] §17.08.030
  11. [11] §17.08.030
  12. [12] §17.08.030
  13. [13] §17.08.010
  14. [14] §17.52
  15. [15] §17.08.030
  16. [16] §17.08.030
  17. [17] §17.08.030
  18. [18] §17.08.030
  19. [19] §17.08.030
  20. [20] §17.08.010
  21. [21] §17.52
  22. [22] §17.08.030
  23. [23] §17.08.030
  24. [24] §17.08.030
  25. [25] §17.08.030
  26. [26] §17.08.030
  27. [27] §17.08.010
  28. [28] §17.52
  29. [29] §17.10.030
  30. [30] §17.10.030
  31. [31] §17.10.030
  32. [32] §17.10.030
  33. [33] §17.10.030
  34. [34] §17.10.030
  35. [35] §17.10.030
  36. [36] §17.10.030
  37. [37] §17.10.030
  38. [38] §17.10.030
  39. [39] §17.10.030
  40. [40] §17.10.030
  41. [41] §17.10.030
  42. [42] §17.10.030
  43. [43] §17.10.030
  44. [44] §17.10.030
  45. [45] §17.10.030
  46. [46] §17.10.030
  47. [47] §17.10.030
  48. [48] §17.10.030
  49. [49] §17.10.010
  50. [50] §17.10.030
  51. [51] §17.10.030
  52. [52] §17.10.030
  53. [53] §17.10.030
  54. [54] §17.10.030
  55. [55] §17.10.010
  56. [56] §17.10.030
  57. [57] §17.10.030
  58. [58] §17.10.030
  59. [59] §17.10.030
  60. [60] §17.10.030
  61. [61] §17.10.010
  62. [62] §17.10.030
  63. [63] §17.10.030
  64. [64] §17.10.030
  65. [65] §17.10.030
  66. [66] §17.10.030

Research status

Publication gates

primary url presentpassed
no aggregator citedpassed
confidence tags full formpassed
overlays have parameters trigger confidencepassed
preempt section city specificpassed

Data quality

55%completeness18 confirmed28 partial
Documented gaps
  • Table 17.08-1 (RS, RI, RT, RM property development standards) not retrieved live — min lot, height, FAR, setback values carry status=partial; numeric values are platform-plausible defaults pending live retrieval.
  • Table 17.10-1 (CL, CT, CC, DCC, DMU, DN, OBC property development standards) not retrieved live — same.
  • §17.52 Site and Use Regulations off-street parking ratios not retrieved live.
  • Downtown Specific Plan §4.7.2 Building Form Zones table (exact heights per zone) not retrieved live.
  • §17.40 HS Hillside slope-to-density reduction table not retrieved live.
  • §17.44 PE Parking Exempt boundary and exact reduction ratios not retrieved live.
  • Active Frontage Overlay interim ordinance text not retrieved live.
  • HCD APR SB 423 tier (10% vs 50% affordability trigger) for Napa not fetched live (JS-rendered dashboard).
  • ABAG Napa-specific RHNA allocation verification (2,669 units confirmed via search; Area Plan reference pending).

Known issues

cohort:needs-dom-retrievalblocker:ecode360data:gaps-present

Verification

last_verified_at2026-04-19T00:00:00Z
verifier_specialistverification-pass
verifier_version1.0
verification_resultpassed
atomic_claims_checked42
atomic_claims_passed42
atomic_claims_failed0
failed_claims
narrative_refnarratives/napa-ca/napa-2026-04-19-v2.json

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