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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 Northern Basement Systems
Northern Basement Systems
4.6(
21
)
Basement Drainage Channels - InstallFoundation Drainage - Install or Replace

Serving Cornish, NH and surrounding areas

Approved

In business since 2010

Free estimates

Warranties offered

"Northern basements was able to fit us in quickly, pulled our crooked cement wall back in-place and sealed the wall to prevent future leaks.  The work was timely, communication was friendly and detailed, and price was as to be expected for the large amount of work that needed to be done.  We are very pleased with the whole process as well as the results.
"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+25

Response time1 day
5 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
193 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

12 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

You should hire a sewer service professional to unclog a main sewer line with tree roots. Tree roots can grow into the main sewer line, and this problem requires a specialized hydro jet, or rooter, that is powerful enough to clear the roots. The tree can also damage the main sewer line, and a professional will need to make repairs or replace the damaged sections. Sewer line replacement costs about $60 to $250 per linear foot.

Using less toilet paper is the easiest way to prevent future clogs. Also, avoid flushing sanitary products, thick paper towels, or hair down the toilet. If you’ve been using a brick in the tank to reduce the water used to flush the toilet, take it out immediately. Bricks will eventually fall apart and clog your toilet drain. Keeping your toilet lid closed also helps avoid future clogs.

No, you should not see water in a sewer cleanout. If you do, it could indicate that you have a block or leak in your main sewer line—which can cause sewage to back up inside your home and potentially flood your yard. Your best bet is to call a local sewer cleaner if you notice any water or sewage around your cleanout.

Yes, frozen pipes can prevent a toilet from working correctly. If the pipes are frozen, water cannot flow, which means your toilet tank won't be able to refill after a flush. This will prevent the toilet from flushing again. Depending on which lines are frozen, the ice can also block the drain pipe, preventing water from flushing away.

As a temporary workaround, you can manually add water to the tank for each flush. To clear a frozen drain pipe, you can try filling the toilet bowl or tank with warm water and flushing to help thaw the ice. However, the best long-term solution is to unfreeze the pipes to get your toilet back in working order.

French drains may fail when they become clogged with soil granules that slip through the pores of the landscaping fabric and through the holes in the pipe. 

Over time, this debris can build up inside the pipe and prevent water flow. To prevent this failure from happening, regularly flush out your French drain and keep debris away from the inlet grate.

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.