Top-rated basement remodelers.

Get matched with top basement remodelers in Portola 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 Portola Valley

Avatar for OT Bay Builders
OT Bay Builders
5.0(
77
)

Serving Portola Valley, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Warranties offered

"We couldnâ t be happier with our bathroom remodel by O.T Bay Builders. The team was skilled, professional, and provided excellent suggestions. The result is amazing"
Broadway Kitchen Remodel
Broadway Full Kitchen remodel
Broadway Full Kitchen remodel
San Francisco Contemporary Kitchen Remodel
San Francisco Contemporary Kitchen Remodel

+81

Response time12 hrs
Response rate98%
3 neighbors recently requested a quote
Avatar for Future Vision Remodeling
Future Vision Remodeling
4.0(
8
)

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2013

Free estimates

Credit card accepted

"The bathroom remodel went well. The completed work was beautiful and completed on time. Especially great job on the tile work. Would definitely hire again"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+555

Response time7 hrs
Response rate100%
7 neighbors recently requested a quote
Avatar for Geico Builders
Geico Builders
5.0(
43
)

Serving Portola Valley, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Free estimates

Warranties offered

"We hire Geico builders for our kitchen remodeling project, and I'm happy to share my experience: Working with Zaya and Geico Builders was a great decision. They were professional, friendly, and easy to work with. From the start, the process was smooth and efficient. The craftmanship of my remodel kitchen and attention to detail were exceptional, and the end result far exceeded my expectations. From the design phase to completion, their communication was excellent, and I felt completely at ease with them working in my home. The design solutions completely transformed my kitchen, making it both functional and beautiful. I highly recommend Geico Builders for anyone looking for a stress-free and satisfying remodeling experience."
Composite Deck Replacement Trex
Full Backyard Remodel with Outdoor Kitchen
Remodeling - Kitchen & Bathroom Project
Deck Replacement Composit
Composite Deck

+270

Response time1 day
13 neighbors recently requested a quote
Recommended by76%of homeowners
Avatar for New Generation Painting & Builders Inc.
New Generation Painting & Builders Inc.
4.9(
53
)

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2020

Free estimates

Credit card accepted

"I am very happy with the work Ivan and Sarai did for me. Everything came out really nice They did epoxy in my garage floor. Over all I am very happy with all the work they did for me. Very nice to deal with them.. I would hire them again if I can afford !"
TRELLIS STAIN
FRONT DOOR
KITCHEN CABINETS REFINISH
STAIN TO PAINT
EXTERIOR PAINTING  PROJECT

+145

Response time2 hrs
Response rate94%
10 neighbors recently requested a quote
Home Pro Remodeling & Construction, Inc.
4.4(
27
)

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

"After calling a few companies, we found Home pro remodeling. Ariel the manager gave us a good offer for the retaining wall, it was the best offer we received compare to other companies ! His guys are super professional, nice and clean. We were very happy with the experience. If you are looking to remodel your home , Home pro remodeling is definitely the best in the area! They are the real deal."
Response time5 days
Recommended by77%of homeowners
Avatar for Plumbing 1 Builder's Inc
Plumbing 1 Builder's Inc
5.0(
15
)

Serving Portola Valley, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Warranties offered

"Leo did a very extensive plumbing repair that required digging through my bathroom floor and replacing a huge pipe to the outside. He also prepared and installed piping and fixtures for a bathroom remodel. Always showed up when he said he would and had a great crew. Cleaned up as well. Would highly recommend. "
Response time3 hrs
64 neighbors recently requested a quote
Avatar for McCormick Home Builders, Inc.
McCormick Home Builders, Inc.
4.3(
21
)

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2017

Free estimates

Customers say: True professional

"We hired McCormick Home Builders to remodel our living room, and we are beyond pleased with the result. The team was professional, worked efficiently, and Aris design ideas made a huge difference. The room feels so much brighter and more spacious. This was the best decision we made for our home, and we were already planning our next remodel with them."
.
.
.
.
.

+1

Response time6 hrs
Recommended by28%of homeowners
Avatar for Prosper Construction Development, Inc.
Prosper Construction Development, Inc.
4.9(
38
)

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2013

Free estimates

Credit card accepted

"I was looking to remodel my kitchen in my new home. After quoting several companies, I decided to go with Prosper Construction. The Sale Rep was very professional and paid attention to detail. I was very nervous through the process but Prosper explained every process which made things easier for me. I got new cabinets in my kitchen with my dream custom island! Quartz countertop, beautiful backsplash, new modern lighting, and tile flooring. Everything at a good price. I highly recommend them to everyone I know If you are looking to remodel your home, give them a call."
modern railing
after staining the new stairs #2
modern kitchen design
convert traditional bathroom into modern bathroom
modern bathroom

+134

Response time6 days
Recommended by97%of homeowners
...
Showing 1-10 of 515
FAQs for basement remodeling projects in Portola 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 Portola Valley, CA homeowners’ guide to basement remodelings

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