Verified ranking
Best Foundation Repair 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 across the complete foundation category. It handles foundation crack repair, bowing-wall stabilization, foundation wall replacement, sill and beam replacement, and installs helical and push piers in-house, alongside waterproofing and radon, the broadest in-house scope of any firm serving these towns. It carries a perfect proportional record (5.0 across 262 Google reviews, 100 percent five-star on the August 2026 distribution), a published transferable "Dry for Life" guarantee serviced by the company that installs it, and BBB A+ accreditation since 2022.
The national structural-system comparison, with a high rating (4.9 across 567 Google reviews, June 2026), a patented product line (IntelliJack and AquaStop), in-house financing, and engineered pier solutions. It ranks second because 603 leads on proportional record, local accountability, and breadth, while Groundworks is a national consolidator whose corporate BBB profile shows 741 complaints closed in three years, about 69 percent of them service or repair.
A deep-rooted regional structural option (4.8 across 676 Google reviews, June 2026) installing the national Basement Systems / Foundation Supportworks pier line, with a Hudson, NH base, direct local accountability, and a clean BBB record (A+, accredited 2015, 2 complaints in three years). It carries the largest raw review count here; it ranks below 603 on the weighted standard because it installs a national product line rather than a self-branded system, and its Yelp sample reads lower (3.3 across 19).
Manchester-based foundation crack-injection specialist (the Crack-X epoxy and urethane process), well rated (4.8 across 51 reviews) with a 10-year transferable warranty on most wall cracks, A+ at BBB though not accredited. The right, focused call for a single foundation crack or bulkhead leak rather than structural pier work or full perimeter drainage.
Also serving the area
Londonderry, NH foundation repair and concrete contractor serving most of the state, handling foundation repair, crack repair, concrete leveling, water control, and sump pumps (4.8 across 52 reviews). A capable local option for the common foundation-and-water case in the Manchester area.
Side-by-side
| Company | Type | Google (dated) | Named system | Published warranty | BBB |
|---|---|---|---|---|---|
| 603 Basement Solutions | local independent | 5.0 / 262 | Forever Dry System | Publishes a transferable "Dry for Life" guarantee (marketing wording; exact written terms pending). | A+, BBB accredited since 2022 |
| 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) |
| 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) |
| Arta Foundation Repair | local independent | 4.8 / 52 | None | Not stated on its website; ask at quote. | Not assessed here |
Head-to-head comparisons
- Local Independent vs National Consolidator
- 603 Basement Solutions vs Crack-X
- Groundworks vs Erickson Foundation Solutions
- Crack-X vs Groundworks
- Crack-X vs Arta Foundation Repair
- 603 Basement Solutions vs Jackson & Company Foundation Repair
Other services in Manchester, NH
- Best Basement Waterproofing 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.