Hand-vetted contractors for kitchens, bathrooms, ADUs, and whole-home remodels across Downtown, Sycamore Park, Homestead Valley, and the Mt. Tam hillsides. We have placed contractors on Mill Valley projects for years.
Mill Valley grew out of a late-1800s logging town and was largely built out between 1900 and 1950, which is why the downtown core around Old Mill Park is full of redwood Craftsman cottages and Queen Anne homes. The Historic Resources Inventory counted roughly 160 buildings constructed before 1930, and that older stock clusters close to town. Climb into the hills off Mt. Tam and the architecture changes entirely: mid-century and contemporary post-and-beam homes (architects including Joseph Esherick) with flat roofs, expansive windows, and exposed beams, set on steep redwood-laden lots with pier-and-beam, caisson, or stepped foundations.
Those two worlds drive very different projects. Near Sycamore Park and Tamalpais Park, the flat and sunny family neighborhoods, we see kitchen openings and bathroom expansions in early cottages. In Homestead Valley and on the hillsides, the work runs to multi-level additions, foundation and drainage upgrades, and modernist remodels that respect the original glass and beam lines. We have matched Mill Valley homeowners with contractors across all of it, from Strawberry near Richardson Bay to the country lots west of Miller Avenue.
Realistic 2026 cost ranges based on the projects our contractors are actually pricing in Mill Valley right now.
In the older cottages near downtown, kitchens are often closed off and original, so the common scope is opening a wall to the living space, new cabinets and quartz, and re-routing plumbing for an island. In hillside post-and-beam homes the challenge is preserving the open plan and exposed beams while modernizing the kitchen inside it.
Craftsman and shingle cottages tend to have small, dated bathrooms that get reworked into curbless walk-in showers with double vanities. On the hillsides, bathroom work often coincides with framing and foundation access, since the wet areas sit over stepped or pier-and-beam structure.
Marin ADUs run higher than flatland counties because so many lots are steep and wooded, which means caisson or stepped foundations and access constraints. Mill Valley's SB 9 two-unit ordinance (Chapter 20.91) excludes very high fire severity zones unless fire-hazard mitigation measures are adopted, so the wildfire layer matters here. Garage conversions sit at the lower end of the range.
Browse ADU models →Hillside homes drive the upper end: multi-level plans, stilt-supported wings, and terraced layouts that often pair a cosmetic remodel with foundation upgrades, drainage work, and cripple-wall or shear adders on older houses. Additions and exterior changes frequently trigger design review, which lengthens the schedule.
Permits run through the City of Mill Valley Planning and Building Department (Building Division) at City Hall, 26 Corte Madera Avenue. The city posts tiered review times: Express Permits in 1-3 business days, Minor Permits in 7-10 business days, and a 4-6 week minimum plan check for residential and commercial projects, with major remodels and anything triggering design review running longer. There is no traditional same-counter over-the-counter issuance for structural or cosmetic remodel work; the city pushes the eTRAKiT online system, and the Planning/Building counter is open Tuesdays and Thursdays from 8:00am to noon.
Mill Valley runs a three-tier planning review (staff, Zoning Administrator, Planning Commission), and design review applications require a public hearing. New residential units, additions in certain zones, and projects raising significant design issues go to the Planning Commission and must comply with the residential design guidelines and the MV2040 General Plan. In June 2021 the city adopted a Historic Resources Inventory that evaluated 176 potentially historic properties; properties on the HRI can require additional review when altered, though the city has not yet established formal historic districts or individual landmarks.
Significant parts of Mill Valley sit in or next to a Very High Fire Hazard Severity Zone and the Wildland-Urban Interface, administered locally by the Southern Marin Fire Protection District. Additions and major remodels trigger Chapter 7A ignition-resistant assemblies (Class A roofing, ember-resistant vents, ignition-resistant siding and decking) plus PRC 4291 defensible-space inspections. Marin is earthquake country with the San Andreas Fault system to the west, so hillside foundation upgrades and foundation-bolting are common adders. The 2025 California Energy Code took effect January 1, 2026, defaulting major mechanical replacements to heat-pump systems, and Mill Valley layers its own electrification reach code on top, so contractors should price the all-electric scope first.
Tell us about your project. A matchmaker will call you within one business day and hand-pick 2–5 contractors from our vetted network who have worked in Mill Valley before.
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