457 Wilson Ave
Novato 94947 · Indian Valley · Unincorporated Marin · Coordinates: 38.09321, -122.60487
Executive Verdict · Public-Records Synthesis
Zoned Undesignated in Unincorporated Marin and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,290,000 ($1,135,000–$1,445,000).
Upsides & Opportunities
- ✓ Documented permitted upgrades (+$20,900 contributory est.)
Public building records show issued construction/renovation work on this parcel (6 total permits, latest Aug 31, 2026).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
Watchouts & Due Diligence
- ! Mapped flood awareness zone (Zone X: minimal flood hazard)
all of the lot of the parcel intersects Zone X: minimal flood hazard. Outside mandatory federal SFHA insurance rules, but check local drainage and finished-floor requirements.
Source: FEMA National Flood Hazard Layer (parcel polygon)
- ! CAL FIRE High Fire Hazard Severity Zone (State Responsibility Area) (about 37% of the lot of lot)
Located in a mapped Fire Hazard Severity Zone. Expect Chapter 7A ignition-resistant building standards, defensible-space inspections, and stricter property insurance underwriting.
Source: CAL FIRE FHSZ (map Apr 1, 2024)
- ! Delayed or open permit activity on this parcel
Remodel / interior alteration (182460): Issued after 5 mo (1.9× the 83d median) — above the 75th percentile for remodel / interior alteration permits in Unincorporated Marin (median 83d, 75th pct 148d, n=1,054).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 5 slow or stalled nearby projects within ½ mile
Closest lead: Accessory dwelling unit at 441 Wilson Ave (0.13 mi W, issued). Inspect timeline history before assuming near-term completion.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · HCD APR (½-mile radius)
Parcel & Assessor
- Lot size:
- 25,613 sq ft (0.59 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 457 WILSON AVE
Zoning & Land Use
Undesignated — Undesignated (Novato)
A2-B4 — Agriculture Limited (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADUCan't tell
Zoned Undesignated (other): ADUs are allowed if the zone allows a home, which depends on the zone's rules. The parcel point also falls in A2-B4.
- SB 9: two homes on the lotCan't tell
Zoned Undesignated (other): we can't tell whether it counts as a single-family zone for SB 9. Undesignated. The parcel point also falls in A2-B4.
- SB 9: split into two lotsCan't tell
Zoned Undesignated (other): we can't tell whether it counts as a single-family zone for SB 9. Undesignated. The parcel point also falls in A2-B4.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- High Fire Hazard Severity Zone (State Responsibility Area) (about 37% of the lot, map Apr 1, 2024); Moderate Fire Hazard Severity Zone (State Responsibility Area) (about 63% of the lot, map Apr 1, 2024)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0278D, effective May 4, 2009
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,135,000 – $1,445,000 · Status: Off market
HUD Small Area FMR (ZIP 94947) · FY 2026
Studio $2,250 · 1BR $2,690 · 2BR $3,260 · 3BR $4,160 · 4BR $4,320
Developments Deserving Closer Investigation & Active Area Builders
- Remodel / interior alteration (182460) (Issued)On this parcel
Issued after 5 mo (1.9× the 83d median) — above the 75th percentile for remodel / interior alteration permits in Unincorporated Marin (median 83d, 75th pct 148d, n=1,054).
- Accessory dwelling unit at 441 Wilson Ave (Issued)0.13 mi W
Active in "Issued" for 5.7 yr (first record Feb 25, 2021) with no new permit activity recorded in 5.7 yr.
- Accessory dwelling unit at 443 Wilson Ave (aka 441) (Issued)0.15 mi W
Active in "Issued" for 5.4 yr (first record Jun 25, 2021) with no new permit activity recorded in 4.8 yr.
- New home at 10 Tanglewood Ln (Issued)0.23 mi S
Active in "Issued" for 8.5 yr (first record May 24, 2018) with no new permit activity recorded in 7.2 yr.
Entity-resolved builders & contractors in ½ mile: Owner Builder (1 on parcel, 11 in ½ mi · Remodel / interior alteration); Owner (2 on parcel, 7 in ½ mi · Accessory dwelling unit (new or conversion)); Best Exteriors Construction (1 on parcel, 1 in ½ mi · Windows / doors / siding); Wedge Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Jeffrey Novak Gen Contr (2 in ½ mi · Accessory dwelling unit (new or conversion)).
Permit & Project History on This Parcel (6 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B48160 | Roof replacement | Issued | Iss. Aug 31, 2026 | $25,000 | ReRoofing |
| 182460 | Remodel / interior alteration | Issued | Iss. Aug 28, 2026 | $38,000 | Relocate Kitchen And Dining Rm (2 Baths Remodel Permitted Under B45338) |
| 94157 | New garage / accessory structure | Applied | App. Apr 20, 2026 | — | Detached Garage |
| B45677 | Windows / doors / siding | Issued | Iss. Jan 29, 2026 | $19,000 | Non-structural Door/Window Replacement |
| B45338 | Other | Issued | Iss. Jan 6, 2026 | $26,000 |