Marin County Addition Market Overview
Marin County's addition permit activity is currently accelerating, with 12 permits filed in the last 30 days compared to 9 in the prior 30-day window. On average, 4.8 addition permits are filed per month here based on the last six months of data. The most active addition contractors in Marin County include BIRDHOUSE BUILDERS LLC, C L CONSTRUCTION, ALVILA GROUP CONSTRUCTION CO LLC.
Recent Addition Permits in Marin County
| Date | Address | Description | Reported Value | Status |
|---|---|---|---|---|
| 2026-09-14 | 274 EMERYSTONE TER (A D U 274A), SAN RAFAEL, CA 94903 | (N) 2 Story A D U Addition With (N) Deck *Scope Re... | $165,000 | Filed |
| 2026-09-09 | 6 WILLOW AVE, STINSON BEACH, CA 94970 | Remodel & Addition; Decks; **B B Q; Retaining Wall... | $1.7M | Filed |
| 2026-09-08 | 85 LANCASTER AVE, KENTFIELD, CA 94904 | Interior Remodel, Bathroom Addition And Remodel, E... | $155,000 | Filed |
| 2026-09-03 | 313 REED BLVD, MILL VALLEY, CA 94941 | Addition And Rennovation, (N) Elevator, Remodel Ga... | $1.1M | Filed |
| 2026-09-02 | 218 PRINCETON AVE, MILL VALLEY, CA 94941 | 2-Story Addition, Kitchen Remodel, Interior Stair ... | $125,000 | Filed |
| 2026-09-01 | 184 MONTEGO KEY, NOVATO, CA 94949 | Remodel & Expand Kitchen And Front Entry; Relocate... | $200,000 | Filed |
| 2026-08-31 | 10 GLENSIDE WAY, SAN RAFAEL, CA 94903 | Guest House - Addition; Remodel; Add Window; Repla... | $220,000 | Filed |
| 2026-08-26 | 328 MELROSE AVE (ADU 328A), MILL VALLEY, CA 94941 | Poolhouse With Bedroom & Bath; Deck - Changed To A | $100,000 | Filed |
| 2026-08-25 | 28 MIDWAY AVE, MILL VALLEY, CA 94941 | Bedroom Addition And Conversion Of The Existing St | $110,000 | Filed |
| 2026-08-20 | 304 RICARDO RD, MILL VALLEY, CA 94941 | Remodel & Addition: Expansion Of 1st Floor With 2n | $580,000 | Filed |
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Choose this market for a free trial →Frequently Asked Questions
How many Addition permits were filed in Marin County in the last 30 days?
Marin County has 12 addition permits dated in the last 30 days in the source records currently available on PermitGrab.
What types of Addition work require permits in Marin County?
In Marin County, permits are typically required for building addition permits including home extensions, room additions, and property expansions. Always check with Marin County's building department for specific requirements.
How can a Addition business research project activity in Marin County?
Use PermitGrab to review matching addition permit records from Marin County’s public source. Use the displayed source date, project scope, and available record fields to research published project activity; a permit is not a request for bids.
How quickly are Addition permits updated on PermitGrab?
The newest displayed source record is dated 2026-09-14. PermitGrab checks the source on each collection cycle and publishes newer records after the source makes them available.