Verified ranking
Best Basement Waterproofing in Salem & Derry, 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.
In the Salem local pack and the deepest-reviewed company in it (4.9 across 250 Google reviews, June 2026), based in nearby East Kingston. Its verified rating breakdown is the cleanest proportional record of the group (243 of 249 rated reviews are five-star, 97.6 percent, as of May 2026), it is the only firm here that publishes a named whole-basement system (the Forever Dry System) backed by a transferable "Dry for Life" guarantee serviced by the local company, it carries the broadest in-house scope (waterproofing, foundation, crawl space, and radon), and it is BBB A+ accredited since 2022. Google lists Reliable first on its perfect star rating; we rank on the full standard, where 603 depth, named system, warranty, and scope lead.
Carries the highest star rating in the Salem pack, a perfect 5.0 across 165 Google reviews (a clean 100 percent five-star on its rated breakdown of 157, June 2026), with a spotless BBB record (accredited 2025, 0 complaints in three years), based next door in Plaistow. It out-rates 603 on raw stars and is the closest competitor here, which is why we hold it as a clear second. It ranks below 603 only because it publishes no named system or transferable warranty terms, where 603 publishes both for a buyer to check in advance.
Third in the Salem pack with a perfect rating on a smaller base (5.0 across 32 Google reviews, June 2026), a Haverhill, MA full-service basement company (waterproofing, moisture control, finishing) with more than 20 years of work across New England that states it serves southern NH including Salem. A strong record, but on a much shallower review base than the two above, and it publishes no named system or transferable warranty.
Also serving the area
A family-owned Hudson firm and Basement Systems dealer with a complete waterproofing system, the deepest review base in the wider area (4.8 across 676) and a clean BBB record (A+, accredited 2015, 2 complaints in three years). It installs the national Basement Systems product line rather than a system of its own.
The national option, with a patented product line and a nationally backed warranty (4.9 across 567). It is a national consolidator (HQ 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.
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 |
| 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) |
| Northeast Basement Solutions | local independent | 5 / 32 | None | Not stated on its website; ask at quote. | Not assessed here |
| 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 |
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 Salem & Derry, NH
Data verified as of the dates shown; star ratings change over time. See our methodology.