Verified ranking
Best Sagging Floor 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 New Hampshire sagging-floor case study that documents failing beams, support columns, an engineered footing, permits, and SmartJack posts. Erickson is locally owned in Hudson and carries a clean BBB record. Its smaller Yelp sample is lower at 3.3 across 19 reviews, and current written warranty and lift terms still need confirmation.
The strongest proportional Google record here at 5.0 across 262 reviews, all five-star in the August 2026 distribution. Its current New Hampshire guidance separates failed columns, weakened beams, sill damage, joist damage, moisture, and foundation settlement, and its structural scope includes lally columns plus sill and beam replacement. It ranks second because no sagging-floor-specific named system or written warranty was independently retrieved; the proposal still needs to trace the complete load path.
A deep local Google record at 4.9 across 567 reviews as of June 2026 and a current sagging-floor page that publishes the SettleStop IntelliJack support system. It ranks behind the local firms because the national BBB profile carried 741 complaints closed in three years as of June 2026, with service or repair the largest category. Confirm the local contracting entity, footing and beam scope, lift goal, and warranty process before signing.
Also serving the area
A Wells, Maine Foundation Supportworks dealer with a Portsmouth office and published eastern New Hampshire coverage. A company-owned Maine project page documents a supplemental steel beam and SmartJack posts for a sagging floor. Its dated Google record is 4.7 across 342 reviews as of April 2026; confirm address eligibility and job-specific terms.
Side-by-side
| Company | Type | Google (dated) | Named system | Published warranty | BBB |
|---|---|---|---|---|---|
| Erickson Foundation Solutions | local national brand | 4.8 / 676 | SmartJack crawl-space support posts (company-published) | The company published a five-year warranty on a 2016 sagging-floor page; confirm current written terms. | A+, accredited 2015, 2 complaints (3yr) |
| 603 Basement Solutions | local independent | 5.0 / 262 | Lally columns and sill or beam repair (company-published) | Sagging-floor repair terms require confirmation in the written proposal. | A+, BBB accredited since 2022 |
| Groundworks | national consolidator | 4.9 / 567 | SettleStop IntelliJack (company-published) | Sagging-floor repair 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 | Supplemental steel beam and SmartJack posts (company-published project) | Sagging-floor repair 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.