506 Fawn Dr
San Anselmo 94960 · Sleepy Hollow · Unincorporated Marin · Coordinates: 38.00376, -122.56888
Executive Verdict · Public-Records Synthesis
Zoned R1-BD in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,966,000 ($1,730,000–$2,202,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-BD supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 20,212 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ 5 documented municipal building permits on file
On-parcel permit history is indexed through Jul 17, 2018, letting you verify roof, HVAC, electrical, or structural work against seller disclosures.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
- ✓ Above-average reinvestment in Sleepy Hollow
32 substantial renovation & housing permits over 24 months (32.7 per 1,000 parcels vs. 16.3 citywide baseline) (#4 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Sleepy Hollow)
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 4% 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
Windows / doors / siding (152355): Issued after 2 mo — slower than 90% of windows / doors / siding permits in Unincorporated Marin (median 0d, 90th pct 5d, n=1,477).
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: New home at 666 Fawn Dr (0.21 mi SE, applied). 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:
- 20,212 sq ft (0.46 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 506 FAWN DR
Zoning & Land Use
R1-BD — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-BD (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-BD, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-BD, a single-family residential zone. The lot is 20,212 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- High Fire Hazard Severity Zone (State Responsibility Area) (about 4% of the lot, map Apr 1, 2024); Moderate Fire Hazard Severity Zone (State Responsibility Area) (about 96% of the lot, map Apr 1, 2024)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0289D, 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: $1,730,000 – $2,202,000 · Status: Off market
HUD Small Area FMR (ZIP 94960) · FY 2026
Studio $2,510 · 1BR $3,010 · 2BR $3,640 · 3BR $4,650 · 4BR $4,820
Nearby Activity (½ mile radius, since November 2024)
3 active or recent development projects (3 housing units across completed, permitted, and pipeline stages) and 139 total building permits recorded within ½ mile.
- New construction1 permit
- Adds housing (ADU)2 permits (2 units)
- Additions & renovations5 permits
- Building systems102 permits
- Repairs4 permits
- Other25 permits
Developments Deserving Closer Investigation & Active Area Builders
- New home at 666 Fawn Dr (Applied)0.21 mi SE
In "Applied" for 7.5 yr (since Apr 29, 2019), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121). High-impact scale (1 housing unit, $1,000,000 declared valuation across 1 permit).
- Windows / doors / siding (152355) (Issued)On this parcel
Issued after 2 mo — slower than 90% of windows / doors / siding permits in Unincorporated Marin (median 0d, 90th pct 5d, n=1,477).
- New home at 830 Butterfield Rd (Issued)0.3 mi W
Active in "Issued" for 8.3 yr (first record Aug 9, 2018) with no new permit activity recorded in 7.6 yr. High-impact scale (1 housing unit, $1,097,000 declared valuation across 2 permits).
- Demolition at 854 Butterfield Ln (Applied)0.27 mi W
In "Applied" for 2.3 yr (since Aug 1, 2024), exceeding the 55d median and 261d 90th percentile for demolition permits in Unincorporated Marin (n=130).
Entity-resolved builders & contractors in ½ mile: Owner Builder (1 on parcel, 24 in ½ mi · Remodel / interior alteration); Charles Window And Door (1 on parcel, 2 in ½ mi · Addition (adds square footage)); Clough James S Enterprises (1 on parcel, 2 in ½ mi · New garage / accessory structure); Sungevity (1 on parcel, 1 in ½ mi · Solar / battery storage); Crown Ridge Roofing (1 on parcel, 1 in ½ mi · Roof replacement).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B15432 | Roof replacement | Issued | Iss. Jul 17, 2018 | $12,975 | tear off existing roof, reroof with class A composition shingles — ReRoofing |
| 152564 | Windows / doors / siding | Issued | Iss. Jun 28, 2016 | $11,000 | Repl 2 Wndws With 1 Patio Slider - Must Meet W U I & Egress Standards |
| 152355 | Windows / doors / siding | Issued | Iss. Jun 15, 2016 | $98,450 | Deck, Sl Gl Door***Ext To 6/15/19 T.D. 5/19/16 |
| 149991 | Solar / battery storage | Issued | Iss. Dec 2, 2015 | $22,000 | Rf Mtd P V Sys 5.138 K W. Chg Contr 1/28/16, From Northern Pacific Power To Sungevity |
| 148764 | Remodel / interior alteration | Issued | Iss. Sep 3, 2015 | $20,000 | Remodel Fam Rm Into Bedroom And Music Room With Closets - Express |