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Find Basement remodelers in Cos Cob

Avatar for The Builders & Cleaners
The Builders & Cleaners
4.9(
94
)

Serving Cos Cob, CT and surrounding areas

Angi Approved

In business since 2018

Free estimates

Emergency services offered

"Reached out to get our gutters cleaned. David was very responsive and offered a reasonable rate. Did the job quickly and thoroughly, sent lots of pictures and video of the finished work. Very satisfied, would definitely recommend"
Dust out from the ductwork
Dust out from the ductwork
Clean vent
Clean vent
Dust in the return

+1761

Response time1 day
Response rate92%
Recommended by89%of homeowners
Avatar for Cecy Gillen Designs, LLC
Cecy Gillen Designs, LLC
4.9(
64
)

Serving Cos Cob, CT and surrounding areas

Angi Approved

Super Service Award Winner

In business since 2000

Free estimates

Warranties offered

"We feel incredibly lucky to have worked with Cecy on our bathroom renovation. We recently purchased an older home that has a lot of charm—but also plenty of quirks—and Cecy was amazing at helping guide us through the entire process. As both a general contractor and someone with a great design eye, she helped us navigate decisions that could have easily felt overwhelming and brought thoughtful solutions that worked beautifully with the character of the house. Cecy’s team was also wonderful to have in our home. Every member of her staff was incredibly sweet, kind, and hardworking. "
INTERIOR & EXTERIOR PAINT
Re-configure Closet space
BUILT-INS
INTERIOR DECOR
KITCHENS

+308

Response time4 days
Response rate90%
Recommended by76%of homeowners
Avatar for A2Z Contractors, LLC
A2Z Contractors, LLC
4.7(
125
)

Serving Cos Cob, CT and surrounding areas

Angi Approved

In business since 2010

Free estimates

Emergency services offered

"I recently hired A-Z Contracting and Weslyn for a laundry room build and a bathroom renovation, and I couldn’t be happier with the results. They built our new laundry room from scratch, including all new plumbing, electrical work, and a new dryer vent installation. They also renovated and extended our bathroom, and the finished space looks fantastic. Weslyn and his team were trustworthy, punctual, and extremely reliable throughout the entire project. I felt completely comfortable giving them access to my home while I wasn’t there, which says a lot about their professionalism and integrity. The craftsmanship is excellent, and the attention to detail really shows in the finished work. All of the workers were knowledgeable, polite, and respectful of our home. The project was completed efficiently and to a very high standard. I would absolutely use A-Z Contracting again and highly recommend Weslyn and his team to anyone looking for quality work done right."
bathroom
bathroom
bathroom
bathroom
bathroom

+5

Response time2 days
16 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Owens Corning Basement Finishing System
Owens Corning Basement Finishing System
4.8(
387
)

Serving Cos Cob, CT and surrounding areas

Angi Approved

In business since 1990

Free estimates

Warranties offered

"Our existing Owens Corning wall panels had been damaged in a basement flood. Although the framework and panels had changed since our initial install some 20 years ago, they custom made new panels that fit perfectly. Additionally, they replaced interior doors and repaired drywall. The work was done on our schedule and done to our satisfaction. Their customer service was great. They came back out to adjust a door that wasn't closing perfectly."
Renovation in Methuen
Renovation in Methuen
Renovation in Methuen
Renovation in Methuen
Renovation in Methuen

+76

Response time1 day
114 neighbors recently requested a quote
Recommended by78%of homeowners
Avatar for HD Renovations
HD Renovations
4.9(
96
)

Serving Cos Cob, CT and surrounding areas

Angi Approved

In business since 2010

Free estimates

Emergency services offered

"I was looking for a contractor to renovate a 2BR rental property. After meeting with several contractors I had decided to go with HD Renovations. During the walkthrough BEFORE the work started, Dominick pointed out a few things and we came up with a plan for the project. Dominick and his crew showed up on time every day and worked non-stop until the project was completed. The work was excellent! When electrical and plumbing issues came up, Dom found a solution. He was a pleasure to work with. Always responsive to every question or idea. He had great suggestions along the way and really took pride in his work. The project lasted a month when others had taken 6-8weeks and stayed very close to budget even though I had made a few additions to the original proposal. As a landlord I have used many contractors over the years. HD Renovations were the best! I look forward to working with them in the future!"
Kitchen and Bath Remodeling Project
Bathroom renovation
Accessible shower two days
Complete demo of existing shower or bathtub area completed in two days.
Bathroom and kitchen remodel

+94

Response time1 day
1 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Connecticut Basement Systems, Inc.
Connecticut Basement Systems, Inc.
4.7(
141
)

Serving Cos Cob, CT and surrounding areas

Angi Approved

In business since 1987

Free estimates

Warranties offered

"Chuck Stofko was very informative. Was patient in answering all my questions. Spent along time with me reviewing the process and the steps needed to waterproof my basment. I highly recommend him."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+12

15 neighbors recently requested a quote
Recommended by93%of homeowners
Hill Top Remodeling, LLC
4.8(
27
)

Serving Cos Cob, CT and surrounding areas

Angi Approved

In business since 2013

Free estimates

Emergency services offered

"If you want sloppy incomplete and incorrect work hire Hilltop. Bill did not use the products contracted for- used less expensive options without telling us - and hardly ever showed up. The job went way beyond promised finish date. Paid the full balance, Bill then left the work unfinished and ghosted us!"
Response time2 days
Response rate91%
5 neighbors recently requested a quote
Avatar for Dynamic Design & Remodeling
Dynamic Design & Remodeling
5.0(
12
)

Serving Cos Cob, CT and surrounding areas

Angi Approved

Super Service Award Winner

Free estimates

Emergency services offered

Credit card accepted

"Justin, Jessica, and the whole Dynamic team were exceptional from start to finish. After shopping around, they offered the best price for our wall repairs, communicated well throughout, and the final product was better than we could have hoped for. we will definitely be using them in the future!"
Weston Kitchen Design
Weston Kitchen Design
Weston Kitchen Design
Weston Kitchen Design
Kitchen Render

+25

5 neighbors recently requested a quote
Recommended by91%of homeowners
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FAQs for basement remodeling projects in Cos Cob, CT

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 Cos Cob, CT homeowners’ guide to basement remodelings

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