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Avatar for Northern Basement Systems
Northern Basement Systems
4.6(
21
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Nelson, NH and surrounding areas

Approved

In business since 2010

Free estimates

Warranties offered

"Paul Swann evaluated our foundation problem and referred us to an engineer who provided a detailed repair plan. Unfortunately, the nature and scope of the proposed repair plan was outside the parameters of what Northern Basement System's themselves could provide. We appreciated their honesty and have been looking for a contractor to take on the project."
Additional Photos
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+25

Response time1 day
7 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for LeBlanc Basement Waterpoofing, LLC
LeBlanc Basement Waterpoofing, LLC
5.0(
3
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Nelson, NH and surrounding areas

Approved

In business since 2007

Free estimates

Emergency services offered

At LeBlanc Basement Waterproofing, we take pride in helping you create a safe and comfortable home. As a local family-owned and operated company, we value integrity, hard work, and doing the right thing. With superior products, state-of-the-art trucks and tools, and expert installation, our team does what it takes to ensure that customer satisfaction is met. \n\nWe have the expertise, materials, and methods to custom-build basement waterproofing systems that meet your needs. Our dedication and hard work make us the leading choice for basement waterproofing, foundation repair, and crawl space encapsulation among Massachusetts families.\n\nWe offer free estimates so that you can know exactly what to expect from our team. Our products and services are reliable and backed by a lifetime transferable warranty. Call us today!

Ion sump pump
Airtight solid sump cover
Ashburnham, MA.
Ashburnham, MA.
Ashburnham, MA.

+28

Response time1 day
1 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Broman Contracting LLC
Broman Contracting LLC
5.0(
9
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Nelson, NH and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"They did the job as defined in the scope. I have not been able to test its full function until we have a heavy rain storm . It is designed to keep the basement dry under heavy rain or tropical down pours.. I was very pleased that they were on time and very communicative throughout the engagement."
Before
Excavation
Backfill
Basement Waterproofing
Finished Concrete

+2

2 neighbors recently requested a quote
Avatar for Groundworks
Groundworks
4.6(
26
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Nelson, NH and surrounding areas

Approved (Corporate)

In business since 1996

Free estimates

Warranties offered

"Just finished a visit with Foreman Doug and his crew, Devin, Sean, and Mason. Waterproofing the basement and super sound and solid work! Doug was professional and very good at keeping me in the loop with the project over the 3 day visit, and created a solid system that we are confident will keep water out of the basement forever. Above and beyond as well with problem solving when having to find solutions to fit our basement layout, all with a solid financing option/great price and 5 year warranty/ yearly inspection plan. If you are stuck with water in your basement, get Groundworks working for you ASAP!"
Foundation
Foundation
Foundation
Basement
Basement

+16

Response time12 hrs
201 neighbors recently requested a quote
Recommended by56%of homeowners
Avatar for Green Home Solutions of North Central MA
Green Home Solutions of North Central MA
4.8(
13
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Nelson, NH and surrounding areas

Approved

In business since 2021

Warranties offered

Credit card accepted

We provide comprehensive indoor air solutions that target the root cause of the problem, not just the symptoms. Our team of experts utilizes science-backed, eco-friendly treatments to eliminate mold, mildew, and other pollutants.\n\nWith years of experience and a commitment to sustainability, we've successfully transformed thousands of homes, offices, and healthcare facilities across America. Our customers trust us to deliver cleaner, healthier indoor air without harming people, pets, or the planet.\n\nOur services include:\n\nIndoor Air Quality Assessments: Identifying and addressing potential health risks.\nMold Remediation: Effective removal of mold and mildew.\nHVAC Duct Cleaning: Improving air circulation and reducing allergens.\nProbiotic Treatments: Enhancing indoor air quality and promoting a healthier environment.\nBreathe easy with Green Home Solutions.\n\n\n\n\n\n\n\n\n

Attic Mold Remediation - Fitchburg, MA
Mold Contamination in Attic
Living Room- Mold remediation - Lowell MA
Living Room Mold Remediation - Lowell, MA
Attic Mold Remediation - Derry, NH

+11

Response time12 hrs
Response rate90%
52 neighbors recently requested a quote
Avatar for Freedom Framing and More, LLC
Freedom Framing and More, LLC
4.3(
14
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Nelson, NH and surrounding areas

Approved

In business since 2014

Free estimates

Warranties offered

Freedom Framing and More, LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and responsibility in all of our jobs. We are a locally owned and operated business with more than 4 years of experience serving New Hampshire, NH and surrounding areas. There is no job too big, or too small for our team. Call today and let us put our experience to work for you!

Before
During
Wrapping up
Finished
Prep

+34

Response time2 days
Response rate95%
Recommended by84%of homeowners
W.W. Water Systems, LLC
5.0(
3
)
Basement Drainage Channels - Repair

Serving Nelson, NH and surrounding areas

Approved

In business since 2010

Free estimates

Offers commercial services

W.W. Water Systems, LLC was started in 2010 by John Wentzel. John has 15 years experience in the well water industry and holds a Bachelors Degree in Environmental Geology. John is a licensed pump installer in the state of NH and is fully insured. Offering a wide range of water treatment options, Ww Water Systems LLC prides itself on delivering effective and sustainable customized solutions to ensure clean and safe water for its customers. By staying abreast of the latest industry trends and innovations, this supplier remains a trusted choice for those seeking high-quality water treatment products in the Keene area. Call today!

Response time7 hrs
4 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Basement Solutions LLC
Basement Solutions LLC
New to Angi
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Nelson, 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
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Showing 1-10 of 53
Basement Waterproofing questions, answered by experts

You’ll need to reseal the foundation every five to 10 years, depending on the sealant you’ve used, the moisture conditions present in and around your home, and the condition of your foundation. Having a foundation inspection conducted before reapplication can help you catch any problems before you begin resealing. Of course, if you notice any new leaks or other moisture problems at any time, it may be necessary to reseal the foundation sooner.

Proper drainage is the only way to ensure that your crawl space stays dry. Depending on your property and the extent of your issue, you might need to consider a gutter system, a French drain, or sump pumps to avoid and handle water and moisture under your home. Dehumidifiers can also help to prevent moisture from accumulating if you have a high-humidity environment.

Many prevention methods can be used individually or in combination to waterproof your basement. Some of the most common waterproofing methods include:

  • Using dehumidifiers 

  • Silicate concrete sealers

  • Vapor barriers 

  • Baseboard channels 

  • Drain tile systems

  • Waterproofing paint

  • Drainage systems

  • Epoxy injection

  • Interior French drains

  • Exterior excavation and waterproofing

  • Cement waterproofing

  • Weep tiles

  • Liquid membrane

  • Sheet membrane 

  • Yard grading

  • Gutters and downspouts

If you don’t wish to dig it out and convert it into a finished basement, you can still encapsulate your crawl space to protect it from damage for an average cost of $5,500. Finishing a crawl space beyond this isn’t really worthwhile, as the low ceilings mean you won’t be able to use the area as living space.

A vapor barrier can last over 20 years, but they are vulnerable to pests, flooding, and other natural disasters. If your home weathers a storm or is treated for any pest infestation, make sure to have a drywall pro come check the integrity of your vapor barrier. It’s also important to have a pro install a vapor barrier since improper installation can lead to tears or leaks in the barrier that shorten its lifespan.

The Nelson, NH homeowners’ guide to basement waterproofing services

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