---
title: "Sundahl Waterproofing"
description: "A 2022 customer said Sundahl Waterproofing put a french drain and 3 sump pumps in their basement, and that Mr. Sundahl kept following up after the work was"
doc_version: "2026-10-15"
last_updated: "2026-10-15"
---

# Sundahl Waterproofing

**Trade:** Waterproofing / Foundation · **Address:** 51 Sugar Hollow Rd Unit 201, Danbury, CT 06810 · **Phone:** (203) 599-7250 · **Website:** https://sundahlwaterproofing.com/ · **Languages:** English

**Rating: 3.4/5** (medium confidence) — from 7 reviews across 5 sources.
100% of sentiment-scored reviews read net-positive. Last 6 months: 0 reviews, 0 negative.

## The honest read

A 2022 customer said Sundahl Waterproofing put a french drain and 3 sump pumps in their basement, and that Mr. Sundahl kept following up after the work was done to make sure the flooding issue was solved. The company describes itself as a New York and Connecticut basement waterproofing, foundation repair and concrete leveling business working Dutchess, Fairfield, New Haven, Putnam and Westchester Counties, and says it does not service Bronxville, Mount Vernon, Yonkers, Rockland County or the Five Boroughs. It says it has been in business for 23 years.

A 2022 customer said Christian explained the job thoroughly, that his workers were fast and neat, and that the French drain saved their basement. A 2022 reviewer wrote that Chris Sundahl oversaw the project and was always available by phone. In a 2023 review, a customer said a concrete sagging problem they doubted could be fixed was solved with specialized equipment. A 2024 customer said the estimate was accurate, the work was done on schedule, and the water problem was solved. A 2025 customer said the workers were polite and got the job done half a day early.

On r/Westchester in 2023, a commenter said they had a good experience with the company, which dug drains and installed sump pumps. In 2024, a commenter in the same forum who got estimates from Sundahl and a competitor said neither addressed the water coming into their crawl space. A 2024 commenter there described Sundahl's opinion on their basement as "no exterior only interior solutions."

**Strengths:**
- A French drain — a 2022 customer said it saved their basement
- Project oversight — a 2022 customer said Chris Sundahl oversaw the project
- Early finish — a 2025 customer said the job finished half a day early
- Sagging concrete fix — a 2023 customer said specialized equipment solved it

**Concerns:**
- Crawl space water — a 2024 Reddit commenter said the estimate did not address it
- Interior-only approach — a 2024 Reddit commenter described no exterior solutions

## Claims & citations

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

- A 2022 customer said the company put a french drain and 3 sump pumps in their basement _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSURXak5ELXJnRRAB!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CIHM0ogKEICAgIDWjND-rgE%7C%7C?hl=en-US) — “5★ I strongly recommend Sundahl Waterproofing.  They put in a french drain and 3 sump pumps in my basement.  Mr. Sundahl is incredibly knowl…”
- A 2022 customer said Mr. Sundahl followed up after the work to make sure the flooding issue was solved _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSURXak5ELXJnRRAB!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CIHM0ogKEICAgIDWjND-rgE%7C%7C?hl=en-US) — “5★ I strongly recommend Sundahl Waterproofing.  They put in a french drain and 3 sump pumps in my basement.  Mr. Sundahl is incredibly knowl…”
- Describes itself as a New York and Connecticut basement waterproofing, foundation repair and concrete leveling business in Dutchess, Fairfield, New Haven, Putnam and Westchester Counties _(confidence: medium)_
  - [Official Website](https://sundahlwaterproofing.com) — “About (self-reported, verbatim): Sundahl Waterproofing provides New York & Connecticut basement waterproofing, foundation repair & concrete …”
- Says it has been in business for 23 years _(confidence: medium)_
  - [Official Website](https://sundahlwaterproofing.com) — “Self-reported 23 years in business”
- A 2022 customer said Christian explained the job thoroughly and the French drain saved their basement _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSURtOVliWUFREAE!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CIHM0ogKEICAgIDm9YbYAQ%7C%7C?hl=en-US) — “5★ Christian explained the job thoroughly. His workers were fast and neat. The French drain saved my basement! The pumps are amazingly quiet…”
- A 2022 customer said Chris Sundahl oversaw the project and was always available by phone _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUQtaXAtR1JREAE!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CIHM0ogKEICAgID-ip-GRQ%7C%7C?hl=en-US) — “5★ I was not only impressed with the professionalism of the work but also that Chris Sundahl oversaw the project and was always available to…”
- A 2023 customer said a concrete sagging problem was solved with specialized equipment _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSURGNC15MVVnEAE!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CIHM0ogKEICAgIDF4-y1Ug%7C%7C?hl=en-US) — “5★ Christian and his crew were outstanding.  We had a concrete sagging issue that I was skeptical could be resolved.  However, the problem w…”
- A 2024 customer said the estimate was accurate, the work was on schedule and the water problem was solved _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUQ3bDR6TS1BRRAB!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CIHM0ogKEICAgID7l4zM-AE%7C%7C?hl=en-US) — “5★ Accurate, competitive estimate. Work done on time and to schedule. Most importantly, water problem solved! ( and fully tested with the ma…”
- A 2025 customer said the workers were polite and finished half a day early _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT25wZlFURkNielJVWm1zeGJscFVTakk0UkdSbU5rRRAB!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CAIQACodChtycF9oOnpfQTFCbzRUZmsxblpUSjI4RGRmNkE%7C%7C?hl=en-US) — “5★ Every one of the workers was polite. And, wow, they worked HARD! Got the job done 1/2 day early.”
- A 2023 Reddit commenter reported a good experience, with drains dug and sump pumps installed _(confidence: medium)_
  - [reddit.com](https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/j7hoy3c/) — “r/Westchester — I had a good experience with https://sundahlwaterproofing.com/. They dug drains and installed sump pumps.”
- A 2024 Reddit commenter said the company's estimate did not address water coming into their crawl space _(confidence: medium)_
  - [reddit.com](https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/kic4vei/) — “r/Westchester — I've had CT Basement Systems, and Sundahl come to give me estimates. Neither of them addresses the water that is coming into…”
- A 2024 Reddit commenter described the company's opinion as interior solutions only, no exterior _(confidence: low)_
  - [reddit.com](https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/ksbj603/) — “r/Westchester — They seemed good but gave us almost identical opinion as Sundahl (no exterior only interior solutions.)”
- 5 stars on Google from 10 ratings _(confidence: high)_
  - [Google](https://www.google.com/maps/search/?api=1&query=Sundahl%20Waterproofing&query_place_id=ChIJjYkid9yrwokR-sK-vwZk4kw) — “Google: 5★ from 10 ratings”
- Specializes in Waterproofing / Foundation _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUQtMVl2d19BRRAB!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CIHM0ogKEICAgID-1Yvw_AE%7C%7C?hl=en-US) — “5★ Christian and his team are fantastic and sets the bar super high.
They are careful beyond compare, neat, respectful strong and incredibly…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSURXak5ELXJnRRAB!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CIHM0ogKEICAgIDWjND-rgE%7C%7C?hl=en-US) — “5★ I strongly recommend Sundahl Waterproofing.  They put in a french drain and 3 sump pumps in my basement.  Mr. Sundahl is incredibly knowl…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSURtOVliWUFREAE!2m1!1s0x0:0x4ce26406bfbec2fa!3m1!1s2@1:CIHM0ogKEICAgIDm9YbYAQ%7C%7C?hl=en-US) — “5★ Christian explained the job thoroughly. His workers were fast and neat. The French drain saved my basement! The pumps are amazingly quiet…”
  - [Official Website](https://sundahlwaterproofing.com) — “About (self-reported, verbatim): Sundahl Waterproofing provides New York & Connecticut basement waterproofing, foundation repair & concrete …”

## License

Status: **not_found** — verified against the official CT state registry, never self-reported.
Re-check at the official registry: https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx

## Sources

- [Reddit](https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/j7hoy3c/): 0 community mentions discussing this business
- [Google](https://www.google.com/maps/search/?api=1&query=Sundahl%20Waterproofing&query_place_id=ChIJjYkid9yrwokR-sK-vwZk4kw): 5.0★ from 10 ratings
- [Google Reviews](https://www.google.com/maps/search/?api=1&query=Sundahl%20Waterproofing&query_place_id=ChIJjYkid9yrwokR-sK-vwZk4kw): Listed on this source
- [Official Website](https://sundahlwaterproofing.com): 23 yrs in business · Self-reported profile and service details
- [Local News](https://pr.washingtoncitypaper.com/article/FRENCH-DRAINS-VS-DRY-WELL-FOR-PROTECTING-AGAINST-FOUNDATION-WALL-CRACKS/64c3b32687aa500008368d70): Listed on this source

## Mentions

Unverified third-party mentions found on the open web — relay with attribution ("a Reddit commenter said…"), never as Tavlee's own finding.

- “I'm curious as well about Sundahl. Did you choose them? Someone else?” — u/Brave_Dirt6631 in r/Westchester (2025-06-03) — https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/mvt2an1/
- “Hi, looking into this company as well. Did you end up going with Sundahl?” — u/Away_Simple_1942 in r/Westchester (2025-05-12) — https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/mrubkkd/
- “They seemed good but gave us almost identical opinion as Sundahl (no exterior only interior solutions.)” — u/MotorHospital6262 in r/Westchester (2024-02-27) — https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/ksbj603/
- “I've had CT Basement Systems, and Sundahl come to give me estimates. Neither of them addresses the water that is coming into my crawl space” — u/EMKAYNY in r/Westchester (2024-01-17) — https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/kic4vei/
- “Can I DM you about your experience with sundahl? I'm thinking of going with them to waterproof our basement” — u/csoreo in r/Westchester (2024-01-10) — https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/kh61uk7/
- “I had a good experience with https://sundahlwaterproofing.com/. They dug drains and installed sump pumps.” — u/euzilla in r/Westchester (2023-02-06) — https://www.reddit.com/r/Westchester/comments/10urtsp/basement_waterproofing_contractor_recommendations/j7hoy3c/

## Recent reviews

- **5/5 · Google Reviews · Maria Vlasak · 2025-07-28**: Every one of the workers was polite. And, wow, they worked HARD! Got the job done 1/2 day early.
- **5/5 · Google Reviews · Thomas Windsor · 2024-08-29**: Accurate, competitive estimate. Work done on time and to schedule. Most importantly, water problem solved! ( and fully tested with the massive rainfall recent of August 2024.)
- **5/5 · Google Reviews · Pat Coppolecchia · 2023-11-09**: Christian and his crew were outstanding.  We had a concrete sagging issue that I was skeptical could be resolved.  However, the problem was solved with some specialized equipment and a lot of know-how.  My only regret is that I did not find Christian and his company before I started winding down my …
- **5/5 · Google Reviews · B D · 2022-12-05**: Christian and his team are fantastic and sets the bar super high.
They are careful beyond compare, neat, respectful strong and incredibly talented.  They completed the job quicker than anticipated.  Our basement is now completely waterproof and house is structurally sound.  I cannot say enough good …
- **5/5 · Google Reviews · Joan Jaworowski · 2022-11-26**: I was not only impressed with the professionalism of the work but also that Chris Sundahl oversaw the project and was always available to reach by phone.  I was completely satisfied with the job and recommend him highly!
- **5/5 · Google Reviews · Matthew Lipinsky · 2022-03-16**: I strongly recommend Sundahl Waterproofing.  They put in a french drain and 3 sump pumps in my basement.  Mr. Sundahl is incredibly knowledgeable and passionate about his work.  His team worked quickly and efficiently.  Mr. Sundahl continues to follow up after all the work was done to ensure the flo…
- **5/5 · Google Reviews · Judy Rubin · 2022-02-05**: Christian explained the job thoroughly. His workers were fast and neat. The French drain saved my basement! The pumps are amazingly quiet. I highly recommend Chrsitian and his company, Sundahl!

---

Data freshness: last scanned 2026-10-13T23:37:21.836Z.
Cite as: Sundahl Waterproofing — Tavlee (https://tavlee.com/contractor/sundahl-waterproofing-danbury)
Source: https://tavlee.com/contractor/sundahl-waterproofing-danbury

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