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    Average homeowner rating
  • Verified reviews icon971
    Verified foundation drain installation services reviews

Top-Rated Foundation drain installation pros in Cos Cob - Updated Nov 2026

Avatar for Groundworks
Groundworks
4.9(
13
)
Sump Pump or Interior Foundation Drains - Install

Serving Cos Cob, CT and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 2025

Free estimates

Warranties offered

Groundworks is the North America's leading and fastest-growing foundation repair and water management solutions provider. Groundworks is a vertically integrated company with its own manufacturing operations and a world-class software solution, allowing us to serve our customers more effectively. From the first phone call to the annual maintenance offered, our customers have peace of mind knowing we're there with one mission to repair, protect and improve their home. For state licenses visit Groundworks.com/licensing

Foundation
Foundation
Foundation
Concrete
Concrete

+16

415 neighbors recently requested a quote
Avatar for AG Property Maintenance, LLC
AG Property Maintenance, LLC
4.6(
12
)
Foundation Drainage - Install or ReplaceSump Pump or Interior Foundation Drains - Install

Serving Cos Cob, CT and surrounding areas

Approved

In business since 2012

Free estimates

Offers commercial services

"Pedro and team solved an ongoing pond drainage issue that was able to be resolved. Many companies came and charged us money for half a job and this was not the case with AG. They were professional, proficient and quickly got to the source of the problem in one day. Prices were fair and they did not have to come back as they had all the supplies they needed to start and finish the job which is very rare for a major culvert issue like this one."
Brookfield ct
Brookfield ct
Brookfield ct
Brookfield ct
Brookfield ct

+4

Response time2 days
4 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Ron's Masonry
Ron's Masonry
5.0(
30
)
Concrete Foundation - InstallFoundation Drainage - Install or Replace

Serving Cos Cob, CT and surrounding areas

Approved

In business since 1995

Emergency services offered

Small jobs welcome

"The communication and scheduling of the project was on point and everything was explained and done as explained. He even did extra that I didnt expect. I respect and appreciate. Thank you, DH"
Walkway
Steps
Footing
Walk
Walk

+36

Response time1 day
Response rate86%
27 neighbors recently requested a quote
Avatar for Aldos plumbing
Aldos plumbing
5.0(
35
)
Sump Pump or Interior Foundation Drains - Install

Serving Cos Cob, CT and surrounding areas

Approved

Free estimates

Emergency services offered

Small jobs welcome

"Aldo responded quickly. He stopped by and gave me an estimate to install a new faucet in a bathroom, and fix a minor leak with a toilet. He offered to do both jobs immediately. Nice clean job."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+41

1 neighbors recently requested a quote
Recommended by44%of homeowners
Avatar for AA Outdoor Services, LLC
AA Outdoor Services, LLC
3.9(
33
)
Concrete Foundation - InstallFoundation Drainage - Install or Replace

Serving Cos Cob, CT and surrounding areas

Approved

In business since 1990

Free estimates

Small jobs welcome

"Vincent knows the cement business. I learned a lot from him. He replaced old cement floor and driveway. He works hard for his customers even weekends when circumstances dictate. I plan to hire him again to install patio stone when I choose the material and design."
Driveway in New Haven (West Haven)
Rear entrance and parking area (West Haven)
Rear entrance and parking area (West Haven)
Step repair (West Haven)
Step repair (West Haven)

+61

Response time9 hrs
Recommended by100%of homeowners
Avatar for Atomic Rooter Inc
Atomic Rooter Inc
4.5(
126
)
Sump Pump or Interior Foundation Drains - Install

Serving Cos Cob, CT and surrounding areas

Approved

In business since 1977

Free estimates

Emergency services offered

"Someone called back right away and schedule to come to our home at 10am. They were 4 hours late. Two guys, one seem to be professional and knew what he is doing. They checked 3 bathrooms and drain pipe, and suggested I replace the flappers, seal one of the toilets, and put epoxy around the possible crack in one of the drain pipes. The whole job took less than an hour and cost me 620 dollars. I am new a home owner and don't have much experience, and I did not request a quote in writing, but I was told in the beginning that smoke test will cost 550, if it comes to it. They did not do it. I feel they used my inexperience to gain. Not to mention, that the problem of smell remained unfixed and I did not see any changes in how toilets work."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+6

Response time8 hrs
Response rate100%
1 neighbors recently requested a quote
Avatar for Dirty Deeds Basement Waterproofing
Dirty Deeds Basement Waterproofing
5.0(
4
)
Foundation Drainage - Install or Replace

Serving Cos Cob, CT and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"Dean, the owner of Dirty Deeds, is a true professional. From a by-gone era, he is a man who cares about his customers problems
and takes pride in solving them to everyone's satisfaction.
 
  Dirty Deeds was at the low end of the estimates we received for installing a French drain in our basement. Dean was
"hands-on" during the entire process, working along with his crew to both install the system and clean-up afterwards.
He personally returned at least twice to check that everything was working properly.
 
 Without hesitation I can recommend that anyone looking to "fix" their water leakage and wet basement problems, call Dirty Deeds as the first step towards a successful resolutioin of their problems.
"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+24

Response time7 hrs
7 neighbors recently requested a quote
Recommended by100%of homeowners
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Showing 1-10 of 348
Foundation Drain Installation FAQs, answered by experts

Basement toilets don’t always need a pump. However, it is the most common setup because plumbing systems use gravity to move waste away from the home. Basement toilets often sit below the home’s main sewage system, and installing a sewage ejector pump pushes the wastewater and sewage up to the main sewer line. Alternatively, you can use an upflush or macerator toilet that breaks down the waste and pushes it straight to the main sewer line rather than via a sewer line from the bathroom.

No, you can’t drain your sump pump into your home’s sewer system. In fact, it’s against the law in many places because dumping extra water into a municipal water system can disrupt or overwhelm the treatment process. And for similar reasons, you shouldn’t discharge a sump pump into your septic system, either.

Yes, the air from a damp basement can travel up into your living area through a process called the stack effect, so moisture, mold spores, and other debris in your basement air can all decrease your indoor air quality on your main floors. Additionally, damp basements can promote the rotting of building materials, which can damage flooring, insulation, and framing on your first floor in addition to materials in the basement.

You can DIY basement waterproofing in some ways to help save on the overall costs. If your basement isn’t experiencing a lot of water but is noticeably humid, you can try running a dehumidifier that will pull the excess water out of the air. If you notice water leaking due to outdoor drainage issues, you can add downspout extensions to keep rainwater away from your home. 

However, if the problem is more severe and requires a more extensive solution, it’s best to call a basement waterproofing professional to assess the treatment you need and install waterproofing safeguards properly. Since keeping water out of your basement is important, ensuring this job is done correctly the first time is best.

There are a few possible sump pump drainage locations, including a neighborhood storm drain, into a creek or pond, or underground. Don’t let your sump pump water go into your sewer or septic system. Ideally, your drainage spot should be on a downhill slope that’s at least 10 to 20 feet away from your home’s foundation. Before choosing a location, check your local codes and regulations.

The Cos Cob, CT homeowners’ guide to foundation drain installation services

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