Top-rated basement remodelers.

Get matched with top basement remodelers in Altadena, 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 Altadena

Supreme Remodeling Inc
4.8(
315
)

Serving Altadena, CA and surrounding areas

Angi Approved

In business since 2000

Free estimates

Warranties offered

"We did a 3 room kitchen and bath remodel in just under 3 months, and we are over the moon with how well everything came out! Micky and his team are simply superb — every team he brought in did top notch work, including tiles, flooring, plumbing, electrical, countertop, cabinets, glass, stucco, windows, drywall, and more. Micky coordinated everything to perfection, ensuring the project was progressing day to day, sometimes hour by hour. The only “negative” was that we had to work hard to keep up with their impressive pace (in terms of making decisions and ordering needed supplies) and it was well worth it! We are now starting an ADU conversion and we can’t wait for the results."
My jobs
My jobs
My jobs
My jobs
My jobs

+115

13 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Beneflipper Construction Corp
Beneflipper Construction Corp
5.0(
10
)

Serving Altadena, CA and surrounding areas

Angi Approved

In business since 2020

Free estimates

Small jobs welcome

"I hired this company to demo the concrete in my backyard in order to set up a proper foundation for an ADU. They came and got the job done quickly and removed any excess material associated with the demo."
Before
1
After
Exterior Side Entrance
Exterior Front Entrance

+122

Response time2 days
2 neighbors recently requested a quote
Recommended by70%of homeowners
Avatar for WeBuild Home Efficient
WeBuild Home Efficient
5.0(
15
)

Serving Altadena, CA and surrounding areas

Angi Approved

In business since 2019

Free estimates

Credit card accepted

"Bar and the WeBuild Efficient team did a great job installing pavers on my driveway and fixing my wooden steps and garage. He was very professional and responsive. I would recommend them, highly."
WeBuild Home Efficient
My jobs
My jobs
My jobs
My jobs

+46

10 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for McCormick Home Builders, Inc.
McCormick Home Builders, Inc.
4.3(
21
)

Serving Altadena, CA and surrounding areas

Angi Approved

In business since 2017

Free estimates

Customers say: True professional

"Leo was very helpful and quick to respond. We’re happy with how our 2 bathrooms turned out. Project was completed within the time promised. Our only complaint is that the workers did not clean up very well. But overall, we’re satisfied and we’ll use them again. "
.
.
.
.
.

+1

Response time6 hrs
Recommended by28%of homeowners
Avatar for CONTINENTAL REMODELING INC
CONTINENTAL REMODELING INC
5.0(
3
)

Serving Altadena, CA and surrounding areas

Angi Approved

In business since 2023

Free estimates

Credit card accepted

"I am absolutely thrilled with the work Continental Remodeling did on my home renovation project! From the initial consultation to the final walk-through, their team was professional, courteous, and attentive to every detail. They truly went above and beyond to ensure that I was completely satisfied with the final result. I highly recommend Continental Remodeling to anyone looking for a reliable and skilled construction company. They truly exceeded my expectations in every way!"
Full Home Remodel (Woodland Hills)
Full Home Remodel (Woodland Hills)
Full Home Remodel (Woodland Hills)
Full Home Remodel (Woodland Hills)
Full Home Remodel (Woodland Hills)

+9

Response time2 days
Recommended by66%of homeowners
Avatar for Oshri Construction
Oshri Construction
5.0(
4
)

Serving Altadena, CA and surrounding areas

Angi Approved

In business since 1986

Free estimates

Emergency services offered

"Asher and his team delivered the job on time and met our discussed estimates budget! They included my wife and I in the decision making process from beginning to end. They were respectful and a pleasure to work with and completely trustworthy. I would recommend them to friends and family without hesitation. -R"
Deck
Kitchen Remodel
Bathroom Remodel
Upscale Bathroom
Guest Bathroom

+99

Response time9 hrs
1 neighbors recently requested a quote
Recommended by75%of homeowners
Avatar for NEXTGEN HOME REPAIR LLC
NEXTGEN HOME REPAIR LLC
5.0(
3
)

Serving Altadena, CA and surrounding areas

Angi Approved

In business since 2024

Free estimates

Offers commercial services

"Nextgen Home Repair did our bathroom remodel and they did such a great job. Honestly what I liked most was how easy they made everything. Remodeling can be stressful, but they kept us updated and explained things clearly along the way. The attention to detail really stood out, the tile work looks amazing and everything feels solid and well done. They were respectful of our home and made sure things were cleaned up at the end of each day. The finished bathroom looks modern and exactly like we envisioned it. I would absolutely recommend them."
Final Product
At night
Before
8 neighbors recently requested a quote
...
Showing 1-10 of 813
FAQs for basement remodeling projects in Altadena, 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 Altadena, CA homeowners’ guide to basement remodelings

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