Verified ranking
Best Foundation Crack Repair in New Hampshire
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.
The deepest verified review base in this set at 4.8 across 676 Google reviews as of June 2026, paired with a current first-party comparison of crack injection and the FlexiSpan wall-crack system. Erickson is locally owned in Hudson, carries a clean BBB record, and publishes different paths for leaking cracks and wider foundation movement. Its smaller Yelp sample is lower at 3.3 across 19 reviews, and the written proposal still needs to identify the crack condition and exact warranty.
The most focused crack-repair specialist in the set, with more than 30 years stated on its New Hampshire page, a published epoxy and urethane injection process, and a 10-year transferable warranty on most wall cracks. Its dated Google record is 4.8 across 51 reviews as of April 2026, with no one-star reviews in that distribution. It ranks behind Erickson on review depth and broader structural capability; Crack-X itself frames the work around crack injection and bulkhead waterproofing rather than piering.
The cleanest proportional Google record here at 5.0 across 262 reviews, all five-star in the August 2026 distribution, and a current New Hampshire crack guide that discusses crack growth, leakage, direction, and companion symptoms. 603 is a local East Kingston foundation and waterproofing company with broader structural capability than a crack-only specialist. It ranks third because a crack-specific repair system and written crack warranty were not independently retrieved; confirm both in the proposal.
Also serving the area
A Hampstead specialist whose current site publishes urethane and epoxy crack injection plus a transferable lifetime-of-structure warranty. Its dated Google record is 4.8 across 20 reviews as of April 2026, a much smaller evidence base than the ranked firms; confirm the warranty scope and company history in writing because current site statements are not fully consistent.
A Londonderry local with an explicit crack-repair page covering injection, water control, reinforcement, and stabilization, backed by a 4.8 Google rating across 52 reviews as of May 2026. General warranty availability is published, but crack-specific terms were not retrieved.
The national option through a Hooksett branch, with a deep local Google record at 4.9 across 567 reviews and current crack-repair guidance. Its corporate BBB profile carried 741 complaints closed in three years as of June 2026, so confirm the local contracting entity, repair system, and warranty process.
A Wells, Maine Foundation Supportworks dealer serving eastern New Hampshire with a current foundation-wall-crack page and a 4.7 Google rating across 342 reviews as of April 2026. Exact crack-specific written warranty terms were not independently retrieved.
Side-by-side
| Company | Type | Google (dated) | Named system | Published warranty | BBB |
|---|---|---|---|---|---|
| Erickson Foundation Solutions | local national brand | 4.8 / 676 | Crack injection and FlexiSpan (company-published) | The company describes warrantied solutions; confirm crack-specific written terms. | A+, accredited 2015, 2 complaints (3yr) |
| Crack-X | local national brand | 4.8 / 51 | The Crack-X epoxy and urethane injection process (company-published) | 10-year transferable warranty on most wall cracks. | A+ but not accredited (Manchester profile) |
| 603 Basement Solutions | local independent | 5.0 / 262 | None published | Crack-repair terms require confirmation in the written proposal. | A+, BBB accredited since 2022 |
| Jackson & Company Foundation Repair | local independent | 4.8 / 20 | Urethane and epoxy injection (company-published) | The company publishes a transferable lifetime-of-structure warranty; confirm scope and written terms. | Not assessed here |
| Arta Foundation Repair | local independent | 4.8 / 52 | Epoxy and polyurethane injection, carbon-fiber reinforcement (company-published) | The company publishes general warranty availability; crack-specific terms were not retrieved. | Not assessed here |
| Groundworks | national consolidator | 4.9 / 567 | Wall reinforcement and pier systems (company-published) | Crack-specific written terms were not independently retrieved. | A+ (corporate); 741 complaints closed in 3 years, 514 Service/Repair (~69%), per BBB national profile, accessed June 2026 |
| TC Hafford Basement Systems | local national brand | 4.7 / 342 | Pier, wall-anchor, and brace systems (company-published) | Company describes warrantied solutions; exact crack-specific terms were not independently retrieved. | Not assessed here |
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Data verified as of the dates shown; star ratings change over time. See our methodology.