6 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Mandan: Groundworks, CR Score 64/100; 5.0★ from 19 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): AAA Waterproofing & Underpinning, posts 24/7 hours; ranked #3 of 6.
Most-reviewed: AAA Waterproofing & Underpinning, 19 Google reviews at 3.2★, tied for the most of 6 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
6 Mandan foundation repair companies are ranked here by CR Score, from ten published factors. 1 is open 24/7, 5 open Saturdays and 4 open Sundays, based on posted hours. The median Google rating is 4.7★ across 6 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Groundworks | 64 | 5.0★ (19) | Bismarck, 8 mi away | Sat · Sun · Evenings | Overall |
| 2 | Superior Sealing | 61 | 5.0★ (9) | Mandan | Sat | — |
| 3 | AAA Waterproofing & Underpinning | 59 | 3.2★ (19) | Etobicoke, 29 mi away | 24/7 | Emergencies, Most reviews |
| 4 | 701 Caulking & Sealant | 58 | 5.0★ (4) | Bismarck, 4 mi away | Sat · Sun · Evenings | — |
| 5 | Bison Renovations | 55 | 4.4★ (7) | Mandan | Sat · Sun · Evenings | — |
| 6 | Castles Landscaping and Curbing | 52 | 4.1★ (10) | Mandan | — | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and review volume: 5.0★ from 19 Google reviews, the most in Mandan.
Based in Mandan
Ranked #2 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Waterproofing service”.
Based in Etobicoke, 29 mi away
Ranked #3 because of its Google rating and review volume: 3.2★ from 19 Google reviews, the most in Mandan.
Based in Bismarck, 4 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Waterproofing service”.
Based in Mandan
Ranked #5 because of its Google rating and review volume: 4.4★ from 7 Google reviews.
Based in Mandan
Ranked #6 because of its Google rating and review volume: 4.1★ from 10 Google reviews.
National price ranges in USD, not adjusted for Mandan. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Foundation repair | $2,225 | $5,174 | $8,133 | Per project: typical range of customer-reported repairs. US national range | October 2026 |
We scored 6 Mandan foundation repair companies on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Mandan data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |