Getting a building permit in Marin County is one of the most common frustrations homeowners face when planning a remodel. Unlike some Bay Area counties where permits move on a predictable schedule, Marin's 11 cities and unincorporated areas each run their own building departments — meaning the experience in Mill Valley can be completely different from San Rafael.
The Short Answer
Plan for 4–12 weeks for most residential permits. Complex projects — ADUs, additions with structural changes, hillside work — can run 3–6 months. Fire rebuild permits are a separate category entirely and depend heavily on CAL FIRE clearance.
City-by-City Breakdown
Mill Valley has improved significantly since hiring additional plan checkers in 2023. Simple kitchen remodels with no structural work can be over-the-counter (OTC) in some cases. ADUs are taking 8–12 weeks for initial review.
Tiburon is known for being thorough. Expect 10–14 weeks for any project in a hillside zone. Their planning department is small and moves deliberately.
San Rafael has the highest volume of permits in the county and has invested in digital submission. Standard residential permits are running 6–8 weeks. Their online portal (etrakit) makes status checks easy.
Sausalito is perhaps the most complex — hillside, coastal, and historic overlay zones can all apply simultaneously. Budget 12–16 weeks and hire a permit expediter if you're on a deadline.
Ross and Belvedere run small, meticulous departments. Projects typically take 8–12 weeks but revisions are common and detailed.
What Slows Permits Down
Incomplete applications are the number-one cause of delays. Missing a soils report, incomplete energy compliance forms (Title 24), or unclear structural notes will trigger a correction notice that adds 3–4 weeks per round.
Discretionary review is triggered when your project requires a variance, design review, or conditional use permit. This can add months and requires public notice.
Fire hazard zone requirements add layers of review for properties in the Wildland-Urban Interface (WUI). Many Marin hillside homes fall into this category.
How We Handle Permits for Our Clients
At ConstruBay, permit management and expediting is part of every project we take on. We maintain relationships with each city's building department, know which plan checkers prefer what format, and pre-check every submittal before it goes in. For most of our projects, we're ahead of the average timeline.
If you're planning an ADU or addition in Marin County and want a realistic permit forecast before you commit to a budget and timeline, call us. That conversation is always free.