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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

You’ll likely pay between $300 and $450 to unclog your toilet with Roto-Rooter. However, the price could change depending on if the clog has caused a lot of damage, which your plumbing pro will want to inspect during your service appointment. Keep in mind that you won’t get a quote from Roto-Rooter over the phone. They have to send a pro out for an in-person cost estimate. You can also attempt to snake your own clog for a lot less, and simple drain snakes cost no more than $50.

In most areas, drain cleaning professionals don’t technically need a license, as they aren’t altering your plumbing system in any way. However, we recommend hiring a drain cleaning professional with a plumbing license and certification. Certified plumbers are more likely to provide professional solutions to drain clogs without damaging your system. They’ll also have the diagnostic tools and experience necessary to remove the clog entirely rather than providing a temporary solution, as a handyperson might. Use Angi’s state licensing tool to check your plumber’s professional licenses before hiring.

Sometimes, the drain is just too clogged—thanks, stubborn hair and soap scum. In this case, you’ll need a more powerful drain cleaner than you can DIY safely at home. But this doesn’t mean you have to choose a traditional drain cleaner. 

You can find biodegradable drain cleaners at your local home improvement store or online for those drains that need a little more oomph. 

While on the hunt for a formidable drain cleaner, the best options are non-chemical clog solutions that combine enzymes and bacteria.

Yes, hiring a drain cleaner is worth it, especially when compared to the cost of not being able to use a sink, shower, toilet, or bathtub and the potential damage that flooding can cause in your home. You might try a temporary drain cleaning liquid or snaking it yourself, but if the clog is out of reach or these methods do not work, then hiring a professional drain cleaner is the way to go.

The cost to clean a sewer line is about $370, ranging from about $190 to $550 on average. The specific cleaning method and the problem's severity will impact the project's overall cost. Some of the most common sewer line cleaning methods include:

  • Snaking or rodding: $100–$250

  • Hydrojetting: $350–$600

  • Chemical treatments: $600–$1,000

  • Repair or replacement: $1,000–$7,500

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.