# KEY WATERPROOFING CONSTRUCTION

**Trade:** Waterproofing / Foundation · **Phone:** (508) 232-5477 · **Website:** http://www.holbrookmawaterproofing.com/?cid=glbc · **Languages:** English

**Rating: 3.9/5** (high confidence) — from 69 reviews across 10 sources.
97% of sentiment-scored reviews read net-positive. Last 6 months: 2 reviews, 0 negative.

## The honest read

Key Waterproofing Construction is a Holbrook, Massachusetts basement waterproofing and foundation-protection contractor that says it serves homeowners across Eastern Massachusetts. The company has been in business for about six years, and its on-site work is led by team members customers repeatedly name as Wendel (also spelled Wendell) and Stephen.

Across Angi, HomeAdvisor, and Google, the business has collected 69 reviews since 2022, the large majority five stars. Homeowners consistently credit the crew for sump pump installations, French drain systems, and basement or foundation waterproofing completed quickly and cleanly, with several reviewers describing same-day or hour-long response for a failed sump pump and others reporting a dry basement through repeated storms years after the work.

The record is not uniformly positive. In a March 2024 review, a homeowner described the crew leaving property damage, including a hole in a wall and broken tile, without returning to address it. A separate 2022 review described a poured concrete slab that cracked and pillars that were not installed as agreed, with no follow-up visit after several months. Both accounts are specific and worth asking about directly, particularly for larger concrete or structural scopes rather than a straightforward sump pump job.

For a sump pump, French drain, or basement waterproofing job in the Holbrook and greater Boston area, Key Waterproofing Construction's long, mostly positive track record and Massachusetts trade license make it worth a quote; for bigger structural or concrete work, ask for recent references given the complaints above.

**Strengths:**
- Fast sump pump response — reviewers cite arrival within an hour of a failure
- Durable waterproofing results — multiple reviewers report dry basements through repeated storms
- Named crew leads — reviewers consistently credit Wendel and Stephen for the work

**Concerns:**
- 2024 property damage report — a reviewer described wall and tile damage left unresolved
- 2022 unmet follow-up — a reviewer described a cracked slab and no return visit

**Where sources disagree:**
- Two Google rating snapshots taken a week apart show different totals: 4.9 stars from 12 ratings on 2026-09-11 versus 3.9 stars from 11 ratings on 2026-09-18.
- Angi and HomeAdvisor publish byte-identical review text for this business, so the same customer accounts appear on both platforms rather than representing independent corroboration.

## Claims & citations

Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication.

- Key Waterproofing Construction is a Holbrook, MA contractor specializing in basement waterproofing, sump pump installation, and foundation drainage, serving Eastern Massachusetts. _(confidence: high)_
  - [Better Business Bureau](https://www.bbb.org/us/ma/holbrook/profile/waterproofing-contractors/key-waterproofing-construction-inc-0021-543845) — “Services offered (Better Business Bureau): Waterproofing Contractors”
  - [Official Website](http://keywaterproofinginc.com) — “Key Waterproofing Construction says it provides waterproofing and foundation-protection services across Eastern Massachusetts.”
- Reviewers across three platforms repeatedly praise fast response for sump pump failures, including one who said the crew arrived within an hour. _(confidence: high)_
  - [Angi](https://www.angi.com/companylist/us/ma/holbrook/key-waterproofing-construction-reviews-1.htm) — “5★ Sump Pump or Interior Foundation Drains Installation — $1,400. Our sump pump broke down and they were here within an hour! Highly highly …”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2kxNVozWnZhR041WW5Cd1NXaG5TR1ZyVUUxamJGRRAB!2m1!1s0x0:0xf8c08786172143b6!3m1!1s2@1:CAIQACodChtycF9oOi15Z3ZvaGN5YnBwSWhnSGVrUE1jbFE%7C%7C?hl=en) — “5★ Wendel came right out and replaced two sump pumps and battery backups for us. Communication was clear and professional and he seems knowl…”
  - [HomeAdvisor](https://www.homeadvisor.com/rated.KeyWaterproofing.89382752.html) — “5★ Our sump pump broke down and they were here within an hour! Highly highly recommended!”
- Multiple reviewers describe a dry basement holding up through repeated storms after French drain or sump pump work. _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2xKVk0yVnFjalpqU0RWNldXdElVMU4wWjFKT1dGRRAB!2m1!1s0x0:0xf8c08786172143b6!3m1!1s2@1:CAIQACodChtycF9oOlJVM2VqcjZjSDV6WWtIU1N0Z1JOWFE%7C%7C?hl=en) — “5★ i needed an egress window put in a bedroom,  they had to dig down about 5 feet They were very neat and clean. They put crushed stone for …”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21SQ2RITktSMHBWVFRjMGJGTTFNVGN0YjJOcFJVRRAB!2m1!1s0x0:0xf8c08786172143b6!3m1!1s2@1:CAIQACodChtycF9oOmRCdHNKR0pVTTc0bFM1MTctb2NpRUE%7C%7C?hl=en) — “5★ We had a basement leak for months. Key Waterproofing Construction came in, diagnosed the issue, and fixed it right the first time. No mor…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUN6NExMV1B3EAE!2m1!1s0x0:0x77e53704b97b866c!3m1!1s2@1:CIHM0ogKEICAgICz4LLWPw%7C%7C?hl=en) — “5★ Highly recommend. They came at a time when I had exhausted my efforts and was told I would need at least 20k to solve the basement floodi…”
- In a March 2024 review, a homeowner described the crew causing property damage, including a hole in a wall and broken tile, that was not addressed afterward. _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUM5enUtbW5BRRAB!2m1!1s0x0:0x77e53704b97b866c!3m1!1s2@1:CIHM0ogKEICAgIC9zu-mnAE%7C%7C?hl=en) — “1★ Hired on Angi’s to install a sump pump after flooding.

Let themselves into my house without knocking, left a giant hole in the wall wher…”
- In a 2022 review, a homeowner said a poured concrete slab cracked and agreed-upon pillars were not installed, with no follow-up after several months. _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUQtb0txc3V3RRAB!2m1!1s0x0:0x77e53704b97b866c!3m1!1s2@1:CIHM0ogKEICAgID-oKqsuwE%7C%7C?hl=en) — “1★ We had a large amount of work done in our basement, including a concrete slab being laid down and new pillars installed.

The pillars wer…”
- The business holds a BBB A+ grade and a combined 4.7-star rating from about 198 ratings on Angi and HomeAdvisor. _(confidence: high)_
  - [Better Business Bureau](https://www.bbb.org/us/ma/holbrook/profile/waterproofing-contractors/key-waterproofing-construction-inc-0021-543845) — “Better Business Bureau grade: A+”
  - [Angi](https://www.angi.com/companylist/us/ma/holbrook/key-waterproofing-construction-reviews-1.htm) — “Angi: 4.7★ from 198 ratings”
  - [HomeAdvisor](https://www.homeadvisor.com/rated.KeyWaterproofing.89382752.html) — “HomeAdvisor: 4.7★ from 198 ratings”
- Specializes in Waterproofing / Foundation _(confidence: high)_
  - [Better Business Bureau](https://www.bbb.org/us/ma/holbrook/profile/waterproofing-contractors/key-waterproofing-construction-inc-0021-543845) — “Services offered (Better Business Bureau): Waterproofing Contractors”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2kxNVozWnZhR041WW5Cd1NXaG5TR1ZyVUUxamJGRRAB!2m1!1s0x0:0xf8c08786172143b6!3m1!1s2@1:CAIQACodChtycF9oOi15Z3ZvaGN5YnBwSWhnSGVrUE1jbFE%7C%7C?hl=en) — “5★ Wendel came right out and replaced two sump pumps and battery backups for us. Communication was clear and professional and he seems knowl…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2xKVk0yVnFjalpqU0RWNldXdElVMU4wWjFKT1dGRRAB!2m1!1s0x0:0xf8c08786172143b6!3m1!1s2@1:CAIQACodChtycF9oOlJVM2VqcjZjSDV6WWtIU1N0Z1JOWFE%7C%7C?hl=en) — “5★ i needed an egress window put in a bedroom,  they had to dig down about 5 feet They were very neat and clean. They put crushed stone for …”
  - [Official Website](http://keywaterproofinginc.com) — “Key Waterproofing Construction says it provides waterproofing and foundation-protection services across Eastern Massachusetts.”

## License

Status: **not_found** — verified against the official MA state registry, never self-reported.
Re-check at the official registry: https://contractorhub.mass.gov/s/hic-contractor-search

## Sources

- [Yelp](https://www.yelp.com/biz/key-waterproofing-construction-holbrook-2): Listed on this source
- [Official Website](http://keywaterproofinginc.com): Self-reported profile and service details
- [Angi](https://www.angi.com/companylist/us/ma/holbrook/key-waterproofing-construction-reviews-1.htm): 4.7★ from 198 ratings
- [HomeAdvisor](https://www.homeadvisor.com/rated.KeyWaterproofing.89382752.html): 4.7★ from 198 ratings
- [Better Business Bureau](https://www.bbb.org/us/ma/holbrook/profile/waterproofing-contractors/key-waterproofing-construction-inc-0021-543845): Listed on this source
- [Google](https://www.google.com/maps/search/?api=1&query=KEY%20WATERPROOFING%20CONSTRUCTION&query_place_id=ChIJZ7lp8DN7kwoRbIZ7uQQ35Xc): 3.9★ from 11 ratings
- [Google Reviews](https://www.google.com/maps/search/?api=1&query=KEY%20WATERPROOFING%20CONSTRUCTION&query_place_id=ChIJZ7lp8DN7kwoRbIZ7uQQ35Xc): Listed on this source
- [Exa](https://linkedin.com/company/key-waterproofing-construction): 0 web mentions across the open web (each linked to its source)
- [Procore Construction Network](https://network.procore.com/p/key-waterproofing-and-construction-acushnet): Listed on this source
- [Houzz](https://www.houzz.com/professionals/specialty-contractors/amesbury-ma-us-probr0-bo~t_11811~r_4929004?fi=45): Listed on this source

## Recent reviews

- **4/5 · Google Reviews · Dylan Scott · 2026-08-20**: Really impressed with the work from Key Waterproofing Construction.
The team arrived on time and handled everything in a very professional way.
They paid attention to the small details and kept the work area organized.
The finished work looks great and gave me confidence in the quality.
I would happ…
- **5/5 · Angi · Jane H. · 2026-08-01**: The job was completed well and the crew worked hard. They are experienced craftsmen and communicated effectively with the owner and tenant. The job was done quickly after the agreement was made. The crew was on the job the next day! Workers were friendly and answered our questions.
- **5/5 · Google Reviews · Katie Sutton · 2026-03-24**: Wendel came right out and replaced two sump pumps and battery backups for us. Communication was clear and professional and he seems knowledgeable. Very happy with my experience!
- **5/5 · HomeAdvisor · Andrew J. · 2026-02-01**: Our sump pump broke down and they were here within an hour! Highly highly recommended!
- **5/5 · Angi · Andrew J. · 2026-02-01**: Sump Pump or Interior Foundation Drains Installation — $1,400. Our sump pump broke down and they were here within an hour! Highly highly recommended! [Response from Key Waterproofing Construction: "Thanks Andy, even though you had another company?s system, it was important for Key Waterproofing to r…
- **5/5 · Angi · Raja R. · 2026-01-01**: Very professional, knowledgeable, kind and considerate of the entire need and cost. Highly recommended (Inspection Service; reported cost $3,300)
- **5/5 · Angi · E J. · 2026-01-01**: Professionals. . Hardworking crew. Clean area and was able to explain the process. (Inspection Service)
- **5/5 · Google Reviews · Cheryl McGrath · 2025-10-31**: i needed an egress window put in a bedroom,  they had to dig down about 5 feet They were very neat and clean. They put crushed stone for the drainage. They also had to cut the foundation to put the window in and then they put the blue board up. I just want to say great job. I am very very pleased. T…
- **5/5 · Google Reviews · Michael Rotenstein · 2025-10-30**: "KeyWaterproofingConstruction"
Highly Recommend Stephen and Wendell's Team!
I just completed a contract with the construction team led by Supervisors Stephen and Wendell for a major project, and I couldn't be happier with the results.
Their team did a significant job waterproofing my basement and ga…
- **5/5 · Angi · Robert M. · 2025-09-01**: Outstanding presentation, outstanding work. Completed and cleaned up everything and a very fair price. Workers never stopped except for water. Unbelievable pace and quality! Thank you Key Construction. Bob from Dartmouth

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Data freshness: last scanned 2026-09-18T05:20:52.436Z.
Cite as: KEY WATERPROOFING CONSTRUCTION — Tavlee (https://tavlee.com/contractor/key-waterproofing-construction-59904)
Source: https://tavlee.com/contractor/key-waterproofing-construction-59904