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Best basement waterproofing pros near Nantucket, MA

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Top-Rated Basement waterproofing pros in Nantucket - Updated Nov 2026

Avatar for Pioneer Basement
Pioneer Basement
4.5(
265
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Nantucket, MA and surrounding areas

Approved

In business since 1984

Free estimates

Emergency services offered

"It went well. They are being professional in their follow-up as they are trying to have us install an expensive basement drainage/pumping system. We haven't decided yet, as it will be part of our basement gut/rehab project."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+5

Response time2 days
4 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Key Waterproofing Construction
Key Waterproofing Construction
4.6(
233
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - RepairBasement Drainage Channels - Install

Serving Nantucket, MA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 2014

Free estimates

Warranties offered

"Stephen and Wendel's crew at Key Waterproofing Construction did an excellent job in waterproofing my basement with cement. They were extremely professional, and superfast. Completed the job in five hours, had a crew of six, to completed a foundation of 200 sq ft. The price was right and job was impeccable, crew left the site nice and clean."
Response time12 hrs
108 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for Kings Masonry & Construction, Corp.
Kings Masonry & Construction, Corp.
5.0(
5
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Nantucket, MA and surrounding areas

Approved

In business since 2021

Free estimates

Offers commercial services

"Living on Cape Cod & the islands limits us with options. I tried to get quotes from local vendors but was told my chimney is to large for their capabilities. Kings Masknary can by for an estimate and was able to diagnose the issues and put a plan in to fix it immediately. I was impressed that they worked thru a weekend in the cold to fix my problem. They did exactly what they said they would do and guaranteed their work for 20 years. What more could you ask for. Was great working with them and would call them again but now . What a great feeling to know that if there is an issue, they will stand by their work."
Response time6 hrs
Response rate95%
Recommended by100%of homeowners
Avatar for Island Construction Corporation
Island Construction Corporation
5.0(
3
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Nantucket, MA and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

\nOur company is guided by specific values that we hold in high regard, such as reliability, excellent communication, integrity, and quality work. As experts in our trade, we are committed to keeping our clients informed and educated throughout their specific tasks or projects, ensuring they receive exceptional service.

Deck renovation
Deck renovation
Deck renovation
Deck renovation
Deck renovation

+9

Response time2 days
20 neighbors recently requested a quote
Recommended by66%of homeowners
Avatar for Custom Coatings
Custom Coatings
5.0(
42
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Nantucket, MA and surrounding areas

In business since 2004

Free estimates

Warranties offered

"I highly recommend Custom Coating. My mahogany deck hasn t looked so good since it was installed over 15 years ago; they power washed, sanded and stained it back to looking new. The only drawback was this high heat and humidity which made drying process slow. I would have them come for maintenance next time but in early spring."
Industrial Garage floor
Industrial Garage floor
Industrial Garage floor
Industrial Garage floor
Before Picture

+53

Response time2 days
Response rate98%
Recommended by85%of homeowners
Avatar for The BullBag
The BullBag
5.0(
15
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Nantucket, MA and surrounding areas

In business since 2001

Credit card accepted

"I have now had 4 pickups from this company. Each time it has been with different items: I have had my kitchen remodeled,  a deck torn down and rebuilt, a new roof put on, old fencing disc arded, and a yard cleanup. The only difference in pricing was for the roofing and even though ti was more money it was STILL CHEAPER than a dumpster!!! I don't know how these guys do it, but they pickup on time, without issue andfor the cost quoted. I have turned each of my contractors onto them - now they are using them. SO MUCH cheaper and better service than any dumpster company I have used!"
The BullBag truck in MA
The BullBag truck in NY
Toys for Tots
Recommended by100%of homeowners
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Basement Waterproofing FAQs, answered by experts

Yes. Water can penetrate through a concrete foundation wall. This can happen whether or not you have cracks, as concrete is a porous material. You’ll want to take steps to waterproof your basement or crawl space.

When considering finishing your basement, take into account a few pros and cons:

Pros

  • Can increase the value of your home

  • Separate space from the rest of the house 

  • Customize and personalize the basement to suit your needs and style

  • Increase the amount of living space in your home

Cons

  • May not regain enough value to cover the cost of finishing

  • Lack of natural light if it’s below ground level

  • Moisture or flooding can cause costly damage

  • Installing plumbing and electrical can be messy and costly

Regular inspections, maintaining proper grading around the foundation, and keeping gutters clear are advisable. Vapor barriers and sealants may need checking for wear after several years.

Standard homeowners insurance policies may cover basement water damage or flooding, but only if it is caused by a sudden and accidental event that is a covered peril, such as a burst pipe or a failing appliance. Damage caused by natural flooding from extreme weather, groundwater seepage, or heavy rain is typically excluded and requires a separate flood insurance policy. Some insurers also offer an optional water backup endorsement for issues like sewer backups. Review your policy or speak with your agent to understand your specific coverage.

Signs include persistent dampness, mold or mildew presence, musty odors, and visible water stains. If any of these occur, it is advisable to contact a professional for an inspection.

The Nantucket, MA homeowners’ guide to basement waterproofing services

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