Verified ranking
Best Basement Waterproofing in Manchester, NH
How we rank (the Bedrock Standard). Every figure below is dated and sourced; star ratings change over time. We read five-star share together with review depth, so a near-perfect share on a large review base counts for more than a perfect score on a small one.
Leads on the weighted standard. It carries the cleanest proportional record of any company serving these towns (4.9 across 250 Google reviews, with 97.6 percent of its rated reviews at five stars per the May 2026 distribution), and it is the only firm here with both a self-branded whole-basement system (the Forever Dry System) and a published transferable "Dry for Life" guarantee serviced by the same local company that installs it. BBB A+ accredited since 2022, and the broadest in-house scope in the set (waterproofing, structural and foundation repair, crawl space, and radon). It is based in East Kingston and serves the Manchester area within its 50-mile radius rather than from a Manchester address, so it does not sit in the city local pack.
A strong, deep-rooted option that out-counts 603 on raw review volume (4.8 across 676 Google reviews, June 2026), with a family-owned NH base in Hudson, direct local accountability, and a clean BBB record (A+, accredited 2015, 2 complaints in three years). It ranks second on our standard because it installs the national Basement Systems product line rather than a system of its own, and its smaller Yelp sample reads lower (3.3 across 19). It carries deeper raw volume than 603 but installs a national product line rather than a system of its own.
Leads the Manchester Google local pack and holds a high rating (4.9 across 567 Google reviews, June 2026) with a patented national product line and in-house financing. It ranks third on our standard because it is a national consolidator (headquartered in Virginia Beach, VA; the Hooksett branch was formerly the independent firm Rescon) whose warranty service runs through the national company, and its corporate BBB profile shows 741 complaints closed in three years, about 69 percent of them service or repair.
Also serving the area
A genuine local independent with the highest star rating in this group (5.0 across 165 Google reviews, a clean 100 percent five-star on its rated breakdown of 157, June 2026) and a spotless BBB record (accredited 2025, 0 complaints in three years). It serves the Manchester area from Plaistow and publishes no named system or warranty terms, so it sits here rather than in the ranked list, but on raw rating it is the highest scorer and worth a quote.
Manchester-based and a foundation crack-injection specialist (epoxy and urethane) rather than a full perimeter-drainage waterproofer (4.8 across 51 reviews, April 2026). The right, lower-cost call for a single wall crack or a leaking bulkhead, not a whole-basement water problem.
Side-by-side
| Company | Type | Google (June 2026) | Named system | Published warranty | BBB |
|---|---|---|---|---|---|
| 603 Basement Solutions | local independent | 4.9 / 250 | Forever Dry System | Publishes a transferable "Dry for Life" guarantee (marketing wording; exact written terms pending). | A+, BBB accredited since 2022 |
| Erickson Foundation Solutions | local national brand | 4.8 / 676 | Installs the national Basement Systems line (TripleSafe, SaniDry, WaterGuard) rather than a self-branded system | Transferable written warranty (duration not stated). | A+, accredited 2015, 2 complaints (3yr) |
| Groundworks | national consolidator | 4.9 / 567 | Patented national product line (IntelliJack, AquaStop) | Lifetime, transferable, nationally backed (verbatim terms not verified). | A+ (corporate); 741 complaints closed in 3 years, 514 Service/Repair (~69%), per BBB national profile, accessed June 2026 |
| Reliable Basement Waterproofing | local independent | 5 / 165 | None | No warranty terms published on its website (may be presented at quote). | A+, BBB accredited 2025, 0 complaints (3yr) |
| Crack-X | local national brand | 4.8 / 51 | The Crack-X process (epoxy/urethane crack injection; not full perimeter drainage) | 10-year transferable warranty on most wall cracks. | A+ but not accredited (Manchester profile) |
Head-to-head comparisons
- Groundworks vs 603 Basement Solutions
- 603 Basement Solutions vs Erickson Foundation Solutions
- Local Independent vs National Consolidator
- 603 Basement Solutions vs Crack-X
- Reliable Basement Waterproofing vs 603 Basement Solutions
- Groundworks vs Erickson Foundation Solutions
- 603 Basement Solutions vs NH Dry Basement
- Crack-X vs Groundworks
- TC Hafford Basement Systems vs 603 Basement Solutions
Other services in Manchester, NH
- Best Foundation Repair in Manchester, NH
- Best Crawl Space Encapsulation in Manchester, NH
- Best Radon Mitigation in Manchester, NH
Data verified as of the dates shown; star ratings change over time. See our methodology.