Top-rated basement remodelers.

Get matched with top basement remodelers in Mill Valley, CA

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Find Basement remodelers in Mill Valley

Avatar for BE HOME REMODELING INC
BE HOME REMODELING INC
4.96(
12
)

Angi Approved

Super Service Award Winner

In business since 2024

Free estimates

Warranties offered

"After they redid our counter tops and island, we had them paint out cabinets and build shelves up to the ceiling. The communication was on point this time and the results speak for themselves. Would definitely recommend them to anyone for any home project. "
607 neighbors recently requested a quote
Recommended by33%of homeowners
R deLeon Construction
New to Angi

Angi Approved

In business since 2022

Free estimates

R deLeon Construction is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

19 neighbors recently requested a quote
Avatar for RG Construction
RG Construction
5.00(
8
)

Angi Approved

In business since 0

Free estimates

Emergency services offered

"Me and my wife decided recently to get our kitchen remolded. After some time searching for the right guys to do the job we settled on RG Construction. Richard, who is the owner, is a great guy and super informative. He never left any question unanswered or left us uncertain about anything. His crew works quick, and they pay attention to the tiniest detail. They absolutely are worth every dollar and I would recommend RG Construction to any homeowner, and I for sure will be giving them a call back for any work I need done in the future. Me and my wife are absolutely in love with our remodel."
11 neighbors recently requested a quote
BE&D Builders
5.00(
1
)

Angi Approved

Free estimates

Emergency services offered

Warranties offered

"My project was a major renovation of a 1985 Victorian home that suffered a devastating fire. Erik and his team did a beautiful job following my architect’s plans, and was also proactive about calling out necessary changes. He was very patient with all of my changes and very specific requests, and was a very calming influence when unexpected surprises inevitably arose during construction. The final results are beautiful, and an historic house has been saved. I look forward to working with Erik again in the future!"
4 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Deleon E Hijo Construction
Deleon E Hijo Construction
5.00(
5
)

Angi Approved

Super Service Award Winner

In business since 2001

Free estimates

"Dedicated & reliable local professionals. Joe and his team were punctual, knowledgeable, personable and most of all, honest! The job was completed in time and we even extended the contract to add additional services which were equally completed with competence. We are very happy to have met them all. Highly recommended."
5 neighbors recently requested a quote
Avatar for SUNRISE CONSTRUCTION & HOME IMPROVEMENT, INC.
SUNRISE CONSTRUCTION & HOME IMPROVEMENT, INC.
5.00(
1
)

Angi Approved

In business since 2009

Free estimates

Emergency services offered

"Water heater started leaking in my Ford unit department building, Monday morning. Tuesday morning before noon the job was done in the water heater is replaced I use this company every time I have issues with either my personal home or my rental properties. They consistently do perfect work. I highly recommend "
4 neighbors recently requested a quote
TH Adams Construction
5.00(
1
)

In business since 1992

General Building Contractor, New residential and commercial construction. Remodeling and T.I.work for offices.

Recommended by100%of homeowners
...
Showing 1-10 of 1015
FAQs for basement remodeling projects in Mill Valley, CA

Finishing a basement turns unused square footage into livable space and returns up to 70% of what you spend when you sell your home. Beyond that resale boost, you gain a playroom, home office, or guest suite you can start enjoying right away. That mix of daily comfort and solid return on investment (ROI) makes basement finishing one of the smartest upgrades you can tackle.

In some parts of the country—especially lots on swamps, high water tables, or other wetlands—local codes prohibit basements. Saturated soil puts constant pressure on foundation walls and lets water seep in faster than any sump pump can handle. 

If your property sits on waterlogged ground, building on a slab or crawl space is often safer, more affordable, and code-compliant.

Most basements wrap up in four to eight weeks. Framing takes three to five days, with electrical and plumbing rough-ins following over the next week. Add five days for drywall, two to three for flooring, and another week for paint, trim, and punch-list items. 

Delays can happen if materials run late or your contractor’s calendar is packed, so build in a little cushion when you plan.

Whether a finished basement counts toward your home’s official square footage depends on local rules. Many areas only include below-grade space if it has code-approved egress, fully finished walls, ceilings, and floors, plus consistent heating. 

Check with your local assessor or building department before you start; meeting those standards can affect taxes, appraisals, and resale value.

Building codes require a checklist: dedicated heat and electrical service, a code-approved stairway, and at least one egress window or exterior door. Walls, ceilings, and floors must be fully finished and meet insulation, ventilation, and fire-separation standards. If you add a bedroom, you’ll also need a closet, proper clearances, and safe exits. If you change the layout later, be ready to update the space so every new room still meets today’s code.

The Mill Valley, CA homeowners’ guide to basement remodelings

From average costs to expert advice, get all the answers you need to get your job done.