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  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon40
    Verified french drain services reviews

Top-Rated French drain pros in Cornish - Updated Nov 2026

Gotme Under Pressure ?, LLC
4.3(
648
)
Drain Clog or Blockage - ClearSump Pump or Interior Foundation Drains - Install

Serving Cornish, NH and surrounding areas

Approved

In business since 1987

Free estimates

Emergency services offered

"Exchanged messages with Mike to describe work needed, replace an outdoor faucet and shutoff value (previous faucet was leaking). He gave an estimate, reviewed work to be done. Replaced outdoor spigot with a frost-proof spigot, put on new value. Quick test and validation. Professional, efficient and happy with work done! Thank you Mike !"
1 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for Groundworks
Groundworks
4.6(
26
)
Sump Pump or Interior Foundation Drains - InstallBasement Drainage Channels - Install

Serving Cornish, NH and surrounding areas

Approved (Corporate)

In business since 1996

Free estimates

Warranties offered

"Joe,James and Bobby did an excellent job replacing the sump pump And drains. My husband and I were so impressed with their abilities and how hard working they were. I would highly recommend Ground works Manchester to anyone who needs the same work done. Thanks to all the gentlemen for their professionalism and work ethic"
Foundation
Foundation
Foundation
Basement
Basement

+16

Response time12 hrs
182 neighbors recently requested a quote
Recommended by56%of homeowners
Avatar for Basement Solutions LLC
Basement Solutions LLC
New to Angi
Basement Drainage Channels - InstallFoundation Drainage - Install or ReplaceSump Pump or Interior Foundation Drains - Install

Serving Cornish, NH and surrounding areas

Approved

In business since 2025

Free estimates

Warranties offered

We pride our company on reliability, integrity and quality work. We are experts in our trade. We look forward to earning your business! We specialize in concrete crack repair and injections, basement waterproofing, sump pump installations, basement and egress window installations, crawlspace repair, moisture control, foundation repair and so much more.\nCall us today for a free estimate.

Egress
Egress
Egress
Sump Pump
Perimeter System

+4

11 neighbors recently requested a quote
Bears Den Builders
New to Angi
Sump Pump or Interior Foundation Drains - Install

Serving Cornish, NH and surrounding areas

Approved

Im a military veteran looking to build my relationship with the community while building trust through my work. Ive worked with companies from corporate to local levels and have watched people get taking through loop holes for basic repairs by being offered the easy replacement option. I love learning new things about how houses were built and ways I can improve the living conditions for the homeowner. \n\nIve done work for affordable housing servicing hundreds of residents to helping customers with growing visions. Being upfront and being honest of all work and pricing is key to proper communication and building the relationship between customer and business. \n\nI strive to perform at a 5 star level and achieving your overall goal.

Avatar for Gotme Under Pressure ?, LLC
Gotme Under Pressure ?, LLC
4.2(
640
)
Drain Clog or Blockage - Clear

Serving Cornish, NH and surrounding areas

In business since 1987

Free estimates

Emergency services offered

"I got a call from Mike right after placing the request. We set up a time to come out and fix the clog in my tub and he was early. Within 45 minutes he had the clogged drain fixed working properly and gave some professional advice on the drain system. I would highly recommend using them for all plumbing needs."
Response time6 hrs
Recommended by89%of homeowners
Avatar for Viper Drain Cleaning
Viper Drain Cleaning
4.1(
48
)
Drain Clog or Blockage - ClearDrain Clog or Blockage - Clear - For BusinessDrain Line Breakage - Camera Locate+1 more

Serving Cornish, NH and surrounding areas

In business since 2020

Free estimates

Emergency services offered

"The owner showed up in under an hour, took a look at the problem, brought in the necessary equipment, went to work immediately and finished the job in under 30 minutes. Chris was polite, knowledgeable and just a very likable worker. Earlier I had asked another plumbing company to come in to snake out a kitchen drain. What a mistake, the other company came in and presented 6 options to fix the clog. They charger me $99 to present solutions from $550 to $5500 (compleate under the sink rebuild). Completely wasted $99. Chris got the drain snaked and cleared for $195. Thanks Chris"
Main Sewer Line Blocked
Response time3 hrs
Response rate97%
Recommended by87%of homeowners
Showing 1-10 of 45
French Drains FAQs, answered by experts

Common drain issues include slow-running drains, whether in a sink or shower, clogged drains, a bad smell, and water backing up into a sink, shower, or bathtub. Causes range from hair, grease, roots, or toilet paper clogging the drainpipes to flooding outside the home, which prevents sewer lines from draining properly.

Yes, many services include camera inspections to identify the cause of the blockage. Confirm with your provider.

Usually it’s fine to leave a toilet clogged overnight, as long as it’s not close to overflowing. In some cases, the extra time may give the clog time to work itself out. For example, if it’s caused by an excess of toilet paper, letting it sit could result in the clog dissolving and you may be able to simply flush it away by the time you wake up. 

Only let it sit though if you have more than one toilet in the home.

Most commercial liquid drain cleaners work in 15 to 30 minutes. Consult the label on the bottle for additional instructions or time suggestions to prevent damage to your drainpipes. Alternative solutions such as baking soda, salt, white vinegar, and/or boiling water can take longer since they are less harsh than liquid drain cleaners.

It is okay to use a drain auger on a toilet, just make sure you are using the correct tip size. The auger is a plumbing snake with a protective sleeve to protect the porcelain toilet bowl from getting scratched. Using too large of an auger can cause the snake to loop back and damage the inside of the drain and plumbing.

The Cornish, NH homeowners’ guide to french drain services

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