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Top-Rated Basement remodelers in Darien - Updated Nov 2026

Avatar for Connecticut Basement Systems, Inc.
Connecticut Basement Systems, Inc.
4.3(
589
)
Basement - Remodel

Serving Darien, CT and surrounding areas

Approved

In business since 1987

Free estimates

Warranties offered

"Great results from waterproofing. Turned my spring flooding anxiety to calm. As humidity rose in summer, I put in a small dehumidifier. Made basement noisy as it struggled to dry and produced a lot of heat. As temperatures rose to about 83 down there and the humidity rose to over 68%, I had same people put in a whole basement commercial-grade dehumidifier. The small unit dropped the humidity to around 50% in less than an hour. Incredible performance and have me peace of mind and peace and quiet downstairs. Temperature dropped gas as well. Weel worth the price to save my most expensive investment."
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+12

168 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Emerald Construction LLC
Emerald Construction LLC
4.9(
44
)
Basement - Remodel

Serving Darien, CT and surrounding areas

Approved

Free estimates

Credit card accepted

Offers commercial services

Emerald Construction LLC is a professional company specializing in construction and renovation for residential and commercial clients. Our experienced team of contractors, designers, and project managers focuses on new construction, remodeling, and property improvements, ensuring top-notch craftsmanship and customer satisfaction. We provide services such as custom home building, kitchen and bathroom renovations, commercial build-outs, and exterior improvements like roofing, siding, and landscaping. We are known for our attention to detail, premium materials, and timely, budget-friendly project completion. With a client-focused approach, we collaborate with homeowners, business owners, and developers to realize their visions. Whether you need a complete property transformation or a simple upgrade, Emerald Construction LLC offers reliable, efficient, and innovative solutions tailored to your needs.

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+6

2 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for A2Z Contractors, LLC
A2Z Contractors, LLC
4.6(
133
)
Basement - Remodel

Serving Darien, CT and surrounding areas

Approved

In business since 2010

Free estimates

Emergency services offered

"After a large water leak in the upstairs kitchen, Weslyn and his team did an amazing job repairing my kitchen cabinets, wood floors, installing a new window, back splash and recessed lights. In the basement, all the walls were repaired, new trim was added, everything was painted, and recessed lights were also added. The largest part of the job however was the newly renovated bathroom. A beautiful new shower system, glass door, recessed lights, double sink vanity, new exhaust with Bluetooth (for music in the shower), and gorgeous tiles were added and the end result was just amazing! The crew were friendly, cleaned up after themselves and did an awesome job. Very respectful and just nice guys. After the renovation I had an issue with my sump pump and Weslyn immediately had a worker come to my house and repair. I would 100% recommend A2Z!"
bathroom
bathroom
bathroom
bathroom
bathroom

+5

Response time2 days
16 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Lasting Strength
Lasting Strength
5.0(
46
)
Basement - Remodel

Serving Darien, CT and surrounding areas

Approved

In business since 1994

Free estimates

Customers say: Quick response

"The carpenter that did the job (Adam) was amazing. He had to expand the space for one window, narrow the space for another, and repair much cedar siding that had rotted away due to water damage. He also reshaped my patio door so it would close and lock more easily. He is a very talented carpenter and I have no qualms about highly recommending him."
tv cabinet built in
shower
wine cellar
built in
pergola

+116

Response time4 days
Response rate100%
5 neighbors recently requested a quote
Avatar for HammerTime Construction Group
HammerTime Construction Group
5.0(
10
)
Basement - Remodel

Serving Darien, CT and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Free estimates

Emergency services offered

"We recently had a complete kitchen renovation and main floor remodel done at my parents' home, and I can’t express how pleased we are with the results. From the very start, William and Miguel made the entire process a dream. William was simply exceptional to work with. He went above and beyond to make sure we were happy every step of the way. Not only was he incredibly helpful, professional, and available at all times, but he also took the time to accompany us to the store to help select the best products, tiling, and appliances—all while keeping us within budget. His advice was spot-on, and his eye for detail was invaluable. Throughout the project, he provided regular updates and checked in frequently to ensure we were comfortable with the progress. One of the biggest challenges was navigating the different perspectives of not only my parents but also myself and my three sisters, all of whom were involved in the decision-making. William handled it all with patience, diplomacy, and a calming presence, making sure everyone was heard and at ease. His guidance was steady and reassuring as he led us through the process with a professionalism that truly impressed us. William has clearly put in the effort to build a top-notch team. He surrounds himself with respectful, hardworking individuals who value trust, honesty, and family as much as he does. It's clear that he genuinely cares about creating bonds with his clients and helping them transform their homes—and their lives. Miguel, the man behind the magic, went above and beyond at every turn. His craftsmanship is excellent—truly top-notch. He was kind, dedicated, and worked tirelessly to get things just right. He arrived early, stayed late, and even came on Saturdays. Despite the language barrier, he used Google Translate skillfully to ensure we were always on the same page. Throughout the project, he kept us informed and even handled extra fixes at no additional cost. It was clear he took great pride in his work, and his attention to detail showed in every aspect of the renovation. By the end, we genuinely felt like we had made new friends in William and Miguel. They did a fantastic job bringing our 1930s house—never before renovated—into a modern and beautiful state. They tackled everything from a complete kitchen demo down to the framing: new insulation, ceilings, floors, walls, appliances, cabinets, a partial wall removal to make room for a gorgeous kitchen island with pendant lighting, and the meticulous restoration of the original hardwood floors. They even went above and beyond after the project was finished, coming back to help us set up exterior security cameras. Their recommendations were spot-on, and they always had an eye for aesthetics while staying within our budget. We couldn't be happier with the transformation they've achieved, and I wholeheartedly recommend them to anyone considering a home renovation. Thank you, William and Miguel, for your hard work, kindness, and professionalism. You made what could have been a stressful project a truly enjoyable experience."
This was a larger bathroom with two accent walls, a tub and sauna shower with jetted shower heads, a custom-cut ceiling, heated pebble flooring, and a mini wooden walkway.
The client wanted a tub sitting on pebble stones with an accent wall, wooden look custom shelving, and a smart floating toilet.
The image showcases a contemporary stand-up shower featuring frameless glass doors that provide a seamless, open look. The interior is adorned with large marble tiles in a soft, neutral tone, giving the shower a luxurious feel.

Built-in niches provide stylish and practical storage for toiletries, while subtle LED lighting enhances the overall ambiance.
Remodeling - General Project
Fireplace Renovation

+41

29 neighbors recently requested a quote
Recommended by70%of homeowners
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Basement Remodel FAQs, answered by experts

The average cost to remodel a basement is between $12,100 and $33,400. Depending on the project's complexity, the price can be as low as $3,500 or exceed $50,200. For a simple project like adding a home office, you might spend between $500 and $3,000. However, a more extensive project, such as adding a bathroom, can range from $6,600 to $16,500. The final cost is influenced by factors like the basement's size and condition, the type of remodel, material choices, your location, and accessibility. For an accurate price, it's best to consult with a basement remodeling team.

Key trends include home gyms, theatre rooms, additional rooms (bedroom/office), and more, with personalized styles reflecting individual preferences.

Yes, you can add a door to your basement—it might even be required, depending on building codes in your area and whether or not you’re using the basement as a bedroom. A basement contractor can give you some advice on installation and help you add a door to your basement.

Basements with persistent moisture problems or flooding shouldn’t be finished until the moisture issues have been fixed. In addition, if your foundation is cracked, you have unmitigated radon levels, or you have asbestos or lead pipes, remediate the underlying problem before finishing your basement. Turning a basement into living space before fixing these issues can lead to serious health risks or structural damage. 

Adding an extension or addition to your home costs more than a loft conversion in all but the rarest cases where the home's structural integrity is lacking. Because a home addition requires a new foundation section or significant structural upgrades to handle a cantilevered portion, the cost compared to almost any loft conversion is significantly greater for the same square footage.

The Darien, CT homeowners’ guide to basement remodels

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