Novato 94947 · Indian Valley · APN 146-350-31 · Unincorporated Marin
Zoned A2-B4 in Unincorporated Marin and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,288,000 ($1,133,000–$1,443,000).
Public building records show issued construction/renovation work on this parcel (4 total permits, latest Sep 11, 2019).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
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)
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)
Automated synthesis of indexed municipal, county, state, and federal public records — informational context only, not a formal appraisal, survey, or legal/tax determination.
45 permits within ½ mile since November 2024
The map shows new construction, ADUs, demolitions, additions, and renovations. Routine systems work (roofs, HVAC, water heaters) is counted but not mapped. Unit counts are as stated on permits.
$1,288,000
Benchmark range: $1,133,000 – $1,443,000
New home at 10 Tanglewood Ln: Active in "Issued" for 8.5 yr (first record May 24, 2018) with no new permit activity recorded in 7.2 yr.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
Closest lead: Accessory dwelling unit at 441 Wilson Ave (0.23 mi NW, 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)
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: permits located by parcel, ½ mile radius · Retrieved Nov 13, 2026
Public-records benchmark estimate combining Zillow Home Value Index (Data provided by Zillow), Census ACS 5-year estimates, parcel land-use/lot characteristics, and issued building permits. Not an official appraisal.
No ADU or new-home permits recorded within ¼ mile in this window.
Permit counts, by the date issued (or applied, if not yet issued). Lot splits are planning cases, which we don't have.
We read public zoning and hazard maps against state law (ADUs: Gov. Code 66314; SB 9: Gov. Code 65852.21 and 66411.7). Local rules, title, tenancy history and site conditions can change the answer. Check with Unincorporated Marin's planning department before relying on it.
Sources: County of Marin GIS (MarinMap), Zoning (11 cities and unincorporated Marin) (retrieved Nov 13, 2026) · CAL FIRE Office of the State Fire Marshal, Fire Hazard Severity Zones in the State Responsibility Area (effective 2024-04-01) (retrieved Nov 9, 2026) · CAL FIRE Office of the State Fire Marshal, Fire Hazard Severity Zones in the Local Responsibility Area (map dated 2025-03-24) (retrieved Nov 9, 2026) · FEMA, National Flood Hazard Layer — flood hazard zones (retrieved Nov 9, 2026) · FEMA, National Flood Hazard Layer — FIRM panels (retrieved Nov 9, 2026) · California Geological Survey, Alquist-Priolo Earthquake Fault Zones (retrieved Nov 9, 2026) · Zoning classes: our classification of A2-B4 as agricultural, checked against the zone description on Oct 24, 2026
Chronological history of building permit applications and issuances, snapshot-dated status changes, State housing entitlements, surrounding development within ½ mile, and area home-value trends.
Permit issued and active for 8.5 yr (first record May 24, 2018), with no completion or new permit record in 7.2 yr. · 1 unit · $480,000 declared valuation
Permit issued and active for 11.6 yr (first record Apr 15, 2015), with no completion or new permit record in 11.4 yr. · 1 unit · $160,000 declared valuation
Permit issued and active for 10.6 yr (first record Mar 31, 2016), with no completion or new permit record in 7.8 yr. · 1 unit · $11,000 declared valuation
Permit issued and active for 5.7 yr (first record Feb 25, 2021), with no completion or new permit record in 5.7 yr. · 1 unit · $5,000 declared valuation
Permit issued and active for 5.4 yr (first record Jun 25, 2021), with no completion or new permit record in 4.8 yr. · 1 unit · $450,000 declared valuation
Permit issued and active for 10 yr (first record Nov 14, 2016), with no completion or new permit record in 4 yr. · 1 unit · $13,750 declared valuation
Latest published Zillow Home Value Index (ZHVI) update
Changed from $983,284 in September 2025 to $1,012,808 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94947 (not a parcel appraisal)
Annual ZIP 94947 home-value index checkpoint
Changed from $1,021,699 in September 2024 to $983,284 in September 2025.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94947 (not a parcel appraisal)
Annual ZIP 94947 home-value index checkpoint
Changed from $993,500 in September 2023 to $1,021,699 in September 2024.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94947 (not a parcel appraisal)
Annual ZIP 94947 home-value index checkpoint
Changed from $1,029,641 in September 2022 to $993,500 in September 2023.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94947 (not a parcel appraisal)
1970 Indian Valley Rd · 1 unit · $13,750 valuation
Records span Nov 14, 2016 to Nov 22, 2022 (3 permits).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94947 home-value index checkpoint
Changed from $949,991 in September 2021 to $1,029,641 in September 2022.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94947 (not a parcel appraisal)
443 Wilson Ave (Aka 441) · 1 unit · $450,000 valuation
Records span Jun 25, 2021 to Jan 14, 2022 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
475 Gage Ln · 1 unit · $952,000 valuation
Records span Nov 24, 2020 to Jan 12, 2022 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94947 home-value index checkpoint
Changed from $792,407 in September 2020 to $949,991 in September 2021.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94947 (not a parcel appraisal)
465 Gage Ln · 1 unit · $1,225,000 valuation
Records span Dec 18, 2019 to Sep 13, 2021 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
475 Gage Ln Was · 1 unit · $425,000 valuation
Records span Dec 18, 2019 to Sep 13, 2021 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
405 Gage Ln · 1 unit · $1,950,000 valuation
Records span Feb 11, 2016 to Jul 12, 2021 (2 permits).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
460 Indian Springs Rd · 1 unit · $200,000 valuation
Records span Dec 29, 2020 to Mar 12, 2021 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
441 Wilson Ave · 1 unit · $5,000 valuation
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Building permit reported to State HCD for 1 housing unit (162602)
Reported in 2019 Housing Element Annual Progress Report
SFD · Owner
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: parcel
Cross-referenced intelligence from our historical development graph—connecting parcels, permits, entity-resolved builders, empirical review-time distributions, and neighborhood renovation trends.
Explore full Unincorporated Marin development graph →Active in "Issued" for 8.5 yr (first record May 24, 2018) with no new permit activity recorded in 7.2 yr.
Issued after 16 mo (5.7× the 83d median) — slower than 90% of general repair permits in Unincorporated Marin (median 83d, 90th pct 328d, n=693).
Issued after 16 mo (5.7× the 83d median) — slower than 90% of general repair permits in Unincorporated Marin (median 83d, 90th pct 328d, n=693).
Issued after 16 mo (3.5× the 136d median) — slower than 90% of pool / spa permits in Unincorporated Marin (median 136d, 90th pct 393d, n=162).
Issued after 16 mo (1.9× the 253d median) — above the 75th percentile for new single-family home permits in Unincorporated Marin (median 253d, 75th pct 456d, n=121).
Active in "Issued" for 5.7 yr (first record Feb 25, 2021) with no new permit activity recorded in 5.7 yr.
Substantial improvements (additions, interior remodels, ADUs, commercial TI, and new builds) across 389 parcels
Small prior baseline
City baseline: 16.4 / 1k
5 in trailing 24m
Includes 0 ADUs
| Builder / contractor | Primary specialty | Here / ½ mi | ½ mi valuation | Citywide 24m trend |
|---|---|---|---|---|
| Owner | New garage / accessory structure | 3 on parcel8 in ½ mi | $3,095,000 | 25 vs 15 prior+67% |
| Owner Builder Recent nearby: 457 Wilson Ave (Aug 28, 2026) | Remodel / interior alteration | 12 in ½ mi | $1,500,030 | 226 vs 240 prior−6% |
| Design Build Specialists Recent nearby: 470 Wilson Ave (Sep 19, 2017) |
| Permit category | Sample (n) | 25th pct | Median (50th) | 75th pct | 90th pct | Recent 24m median |
|---|---|---|---|---|---|---|
| New single-family homeOn this parcel | 121 | 166d | 253d | 456d | 686d | 211d(vs 273d prior) |
| New multifamily / condos / mixed-use | 21 | 272d | 292d | 293d | 313d | 293d(vs 197d prior) |
| Accessory dwelling unit (new or conversion) | 298 | 120d | 204d | 331d | 549d | 214d(vs 181d prior) |
HUD Small Area Fair Market Rent · ZIP 94947
HUD FY 2026 · 40th-percentile gross rentCensus ACS 5-year median gross rent (all bedroom counts combined):
Area home-value benchmarks (not an appraisal)
ZIP & neighborhood mediansUnder California Proposition 13, the seller's historical assessed value does not carry over to a buyer. On sale, the parcel is reassessed at the purchase price: 1.00% base rate ($12,900/yr) + local voter-approved bond debt ($1,935/yr) + fixed direct levies/Mello-Roos ($450/yr).
Mapped hazard zone insurance context on this parcel:
Model adding a backyard ADU or garage conversion under California's Prop 13 blended new-construction assessment (existing house & land tax base stays intact; only ADU build cost is assessed) and SB 13 impact-fee rules.
−$66,674/yr
Cash needed: $283,800
NOI: $11,601/yr
P&I: $6,523/mo
For $0/mo net cash flow
At $3,250/mo gross rent
| Scenario | Assumptions | Year 1 Rent | Year 1 Cash Flow | Cash-on-Cash | Break-Even Rent | Year 5 Cash Flow |
|---|---|---|---|---|---|---|
| Conservative | −8% starting rent, +3% vacancy, +3% combined maintenance/CapEx, 1.5%/yr rent growth | $2,990/mo | −$5,930/mo | -25.1% | $11,267/mo | −$5,929/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $3,250/mo | −$5,556/mo | -23.5% | $10,429/mo | −$5,371/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $3,445/mo | −$5,342/mo | -22.6% | $10,186/mo | −$4,947/mo |
Rental regulatory context (informational only — not legal advice):
California AB 1482 (Tenant Protection Act, Civ. Code § 1947.12) caps annual rent increases at 5% + local CPI (max 10%) on covered properties.
Issued1 unitsMay 24, 2018 – Sep 11, 2019
We group related permits and State housing reports into projects. That grouping is our inference, not an official record.
Retaining Wall - Back Of House
Retaining Wall - Fire Turnout
New Pool & Spa T.D. 10/25/18
New Sfd T.D. 10/25/18
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel (APN) · Retrieved Nov 13, 2026 · Received and issued dates come from the County of Marin. The county publishes no final or expired status, so an issued permit stays 'Issued' after the work is done.
| Report year | Project / record | Type | Entitled | Permitted | Completed | Deed-restricted |
|---|---|---|---|---|---|---|
| 2019 | —(162602) | SFD · Owner | — | 1 (Sep 11, 2019) | — | — |
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: project (parcel) · Retrieved Nov 9, 2026 · From Unincorporated Marin's Housing Element Annual Progress Reports. A project can appear in several report years as it moves from entitlement to permit to completion.
Source: County of Marin GIS (MarinMap), Zoning (11 cities and unincorporated Marin) · Geography: zoning district polygon at parcel point · Retrieved Nov 13, 2026
2.09 acres
Assessor's classification for assessment purposes. This is not zoning.
10 TANGLEWOOD LN
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 13, 2026
Search by parcel number 146-350-31. Assessed value is not market value.
Search by parcel number 146-350-31 (Marin County Tax Collector)
Permits issued in unincorporated Marin in the past 48 months. Each city keeps its own records.
The official flood hazard map for this location. Our reading of it is under What could be built here.
This site does not show owner names.
| New garage / accessory structure |
| 2 in ½ mi |
| $94,000 |
| 0 vs 2 prior |
| Wormood Recent nearby: 505 Slodown Ct (Feb 20, 2018) | Remodel / interior alteration | 2 in ½ mi | $40,190 | 1 vs 2 prior |
| Gudgel Rick Recent nearby: 402 Bloom Ln (Feb 25, 2022) | Addition (adds square footage) | 1 in ½ mi | $570,000 | 0 vs 0 prior |
| Michael J Arruda Construction Recent nearby: 443 Wilson Ave (Aka 441) (Jan 14, 2022) | Accessory dwelling unit (new or conversion) | 1 in ½ mi | $450,000 | 0 vs 0 prior |
| Ajd Builders Recent nearby: 1970 Indian Valley Rd (Nov 6, 2024) | Remodel / interior alteration | 1 in ½ mi | $425,000 | 0 vs 0 prior |
| Sausalito Construction Recent nearby: 452 Wilson Ave (May 15, 2014) | Addition (adds square footage) | 1 in ½ mi | $255,000 | 0 vs 0 prior |
| Tom Lynch Construction Recent nearby: 460 Indian Springs Rd (Mar 12, 2021) | Accessory dwelling unit (new or conversion) | 1 in ½ mi | $200,000 | 0 vs 0 prior |
| Herbs Pool Service Recent nearby: 261 Wilson Ave (Mar 24, 2023) | Pool / spa | 1 in ½ mi | $184,665 | 0 vs 4 prior |
| Addition (adds square footage) | 316 | 103d | 160d | 249d | 440d | 157d(vs 167d prior) |
| Remodel / interior alteration | 1,054 | 36d | 83d | 148d | 266d | 112d(vs 77d prior) |
| Commercial tenant improvement | 81 | 99d | 148d | 233d | 443d | 152d(vs 150d prior) |
| Pool / spaOn this parcel | 162 | 84d | 136d | 241d | 393d | 128d(vs 155d prior) |
| General repairOn this parcel | 693 | 38d | 83d | 181d | 328d | 97d(vs 66d prior) |
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Computed from issued permits with recorded application and issuance dates over the trailing 60 months. Categories with fewer than 20 permits are excluded.