403 Calle De La Mesa
Novato 94949 · Loma Verde · Unincorporated Marin · Coordinates: 38.06683, -122.54580
Executive Verdict · Public-Records Synthesis
Zoned R1 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $1,241,000 ($1,092,000–$1,390,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 7,710 sq ft lot. Local precedent is active with 2 ADU permits within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$4,752 contributory est.)
Public building records show issued construction/renovation work on this parcel (4 total permits, latest May 30, 2019).
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)
- ! 5 slow or stalled nearby projects within ½ mile
Closest lead: Accessory dwelling unit at 424 Corte Escuela (0.22 mi SW, 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)
- ! Year 1 Prop 13 tax reset (~$14,722/yr at $1,241,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,227/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
Parcel & Assessor
- Lot size:
- 7,710 sq ft (0.18 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 403 CALLE DE LA MESA
Zoning & Land Use
R1 — Residential Single Family (Unincorporated Marin)
Undesignated — Undesignated (Novato)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1 (single-family residential): state law allows ADUs where homes are allowed. The parcel point also falls in Undesignated.
- SB 9: two homes on the lotLikely eligible
Zoned R1, a single-family residential zone. The parcel point also falls in Undesignated.
- SB 9: split into two lotsLikely eligible
Zoned R1, a single-family residential zone. The parcel point also falls in Undesignated. The lot is 7,710 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
- Not in a State-mapped fire hazard severity zone
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0283E, effective March 16, 2016
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,092,000 – $1,390,000 · Status: Off market
HUD Small Area FMR (ZIP 94949) · FY 2026
Studio $2,360 · 1BR $2,830 · 2BR $3,430 · 3BR $4,380 · 4BR $4,540
Nearby Activity (½ mile radius, since November 2024)
4 active or recent development projects (4 housing units across completed, permitted, and pipeline stages) and 160 total building permits recorded within ½ mile.
- Adds housing (ADU)4 permits (4 units)
- Demolition1 permit
- Additions & renovations4 permits
- Building systems125 permits
- Repairs3 permits
- Other23 permits
Developments Deserving Closer Investigation & Active Area Builders
- Accessory dwelling unit at 424 Corte Escuela (Applied)0.22 mi SW
In "Applied" for 2.8 yr (since Jan 17, 2024), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Accessory dwelling unit at 483 Alameda Del Prado (Applied)0.41 mi SE
In "Applied" for 2 yr (since Oct 25, 2024), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Accessory dwelling unit at 422 Corte Escuela (a D U 422 A) (Issued)0.24 mi SW
Active in "Issued" for 3.9 yr (first record Dec 28, 2022) with no new permit activity recorded in 12 mo.
- Accessory dwelling unit at 477 Alameda De La Loma (aka 477a) (Issued)0.29 mi W
Active in "Issued" for 2.5 yr (first record May 6, 2024) with no new permit activity recorded in 2 yr.
Entity-resolved builders & contractors in ½ mile: Owner Builder (1 on parcel, 18 in ½ mi · Remodel / interior alteration); Bay Building And Remodel (1 on parcel, 1 in ½ mi · Remodel / interior alteration); M Ross Construction (1 on parcel, 1 in ½ mi · Remodel / interior alteration); Millennium Security And Fire (1 on parcel, 1 in ½ mi · HVAC / heat pump); Owner (11 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 161652 | Remodel / interior alteration | Issued | Iss. May 30, 2019 | $12,000 | Bathroom Rmdl (2) - Express |
| 154125 | HVAC / heat pump | Issued | Iss. Dec 19, 2016 | $6,000 | Fireplace Conversion - Wood To Gas Insert |
| B11482 | HVAC / heat pump | Issued | Iss. Dec 6, 2016 | $325 | INSTALL 120V A/C OUTLET FOR FIREPLACE INSERT USING EXISTING GARAGE OUTLET NEAR FIREPLACE. GFCI OUTLET IN GARAGE WILL BE … |
| 143356 | Remodel / interior alteration | Issued | Iss. Jul 16, 2014 | $20,000 | Rmdl Kitchen - Express |