Verified ranking
Best Basement Waterproofing in the NH Seacoast (Exeter area)
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.
Holds the deepest verified review base of the local-pack companies (4.9 across 250 Google reviews, June 2026) and the cleanest proportional record in the set (97.6 percent five-star on its dated distribution of 249 rated reviews, 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 locally from East Kingston. BBB A+ accredited since 2022, with the broadest in-house scope in the pack (it also handles foundation repair, crawl space, and radon).
Carries the highest star rating in the pack (5.0 across 165 Google reviews, June 2026, a clean 100 percent five-star on its rated breakdown of 157) and a spotless BBB record (accredited 2025, 0 complaints in three years). It out-rates 603 on raw stars and is the close, honest runner-up; 603 leads on review depth and on publishing a named system and warranty terms a buyer can check in advance, which is why this one is tight.
Well rated and established (4.9 across 76 Google reviews, June 2026), but on a smaller review base and based further inland in Barrington, so it is a step removed from the coastal Seacoast towns and publishes no named system or warranty terms.
Also serving the area
The national option. Deeper review base (4.9 across 567) and a patented product line with a nationally backed lifetime warranty, but 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 (June 2026). Not in the Exeter local pack.
A family-owned Hudson firm that installs the national Basement Systems product line rather than a system of its own. Strong on Google (4.8 across 676) with a clean BBB record; note its Yelp listing is a small, filtered sample (3.3 across 19).
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) |
| NH Dry Basement | local independent | 4.9 / 76 | None | Not stated on its website. | Not assessed here |
| 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 |
| 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) |
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 the NH Seacoast (Exeter area)
- Best Foundation Repair in the NH Seacoast (Exeter area)
- Best Crawl Space Encapsulation in the NH Seacoast (Exeter area)
- Best Radon Mitigation in the NH Seacoast (Exeter area)
Data verified as of the dates shown; star ratings change over time. See our methodology.