111 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Frederick: Fortress Foundation Solutions, CR Score 63/100; 4.9★ from 476 Google reviews.
Best for emergencies (open 24/7): Armored Basement Waterproofing, posts 24/7 hours; ranked #2 of 111.
Most-reviewed: American Professional Chimney & Masonry, 513 Google reviews at 4.9★, the most of 111 ranked; ranked #32.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
111 Frederick foundation repair companies are ranked here by CR Score, from ten published factors. 22 are open 24/7, 72 open Saturdays and 39 open Sundays, based on posted hours. The median Google rating is 4.9★ across 111 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Fortress Foundation Solutions | 63 | 4.9★ (476) | Frederick | — | Overall |
| 2 | Armored Basement Waterproofing | 62 | 5.0★ (128) | Baltimore, 22 mi away | 24/7 | Emergencies |
| 3 | Beyond Waterproofing and Foundation Repair | 61 | 4.9★ (120) | Damascus, 14 mi away | Sat · Sun · Evenings | — |
| 4 | Thompson & Sons Waterproofing Inc. | 60 | 5.0★ (153) | Baltimore, 36 mi away | 24/7 | — |
| 5 | Dry Space Waterproofing | 59 | 5.0★ (7) | Walkersville, 6 mi away | 24/7 | — |
| 6 | Tru Integrity LLC | 58 | 5.0★ (147) | Baltimore, 40 mi away | Sat · Sun · Evenings | — |
| 7 | DMV Waterproofing, North Bethesda | 58 | 5.0★ (55) | Rockville, 27 mi away | Sat · Sun | — |
| 8 | CNR Restoration | 58 | 4.8★ (85) | Frederick | 24/7 | — |
| 9 | Triad Basement Waterproofing | 58 | 5.0★ (37) | Frederick | Sat · Sun · Evenings | — |
| 10 | AdvantaClean of Frederick | 58 | 4.8★ (76) | Frederick | 24/7 | — |
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 trade focus: 4.9★ from 476 Google reviews, listed on Google as “Waterproofing service”.
Based in Baltimore, 22 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 128 Google reviews, listed on Google as “Waterproofing service”.
Based in Damascus, 14 mi away
Ranked #3 because of its Google rating and trade focus: 4.9★ from 120 Google reviews, listed on Google as “Waterproofing service”.
Based in Baltimore, 36 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 153 Google reviews, listed on Google as “Waterproofing service”.
Based in Walkersville, 6 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Waterproofing service”.
Based in Baltimore, 40 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 147 Google reviews, listed on Google as “Waterproofing service”.
Based in Rockville, 27 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 55 Google reviews, listed on Google as “Waterproofing service”.
Based in Frederick
Ranked #8 because of its Google rating and review volume: 4.8★ from 85 Google reviews.
Based in Frederick
Ranked #9 because of its Google rating and trade focus: 5.0★ from 37 Google reviews, listed on Google as “General contractor”.
Based in Frederick
Ranked #10 because of its Google rating and review volume: 4.8★ from 76 Google reviews.
Based in Halfway, 25 mi away
Ranked #11 because of its Google rating and trade focus: 4.5★ from 25 Google reviews, listed on Google as “Waterproofing service”.
Based in Chambersburg, 39 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 35 Google reviews, listed on Google as “Waterproofing service”.
Based in Martinsburg, 29 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 34 Google reviews, listed on Google as “Waterproofing service”.
Based in Sterling, 28 mi away
Ranked #14 because of its Google rating and trade focus: 4.8★ from 83 Google reviews, listed on Google as “Waterproofing service”.
Based in Darnestown, 30 mi away
Ranked #15 because of its Google rating and trade focus: 4.4★ from 7 Google reviews, listed on Google as “Waterproofing service”.
Based in Frederick
Ranked #16 because of its Google rating and review volume: 4.0★ from 32 Google reviews.
Based in Pikesville, 37 mi away
Ranked #17 because of its Google rating and trade focus: 4.8★ from 45 Google reviews, listed on Google as “Waterproofing service”.
Based in Bethesda, 34 mi away
Ranked #18 because of its Google rating and review volume: 5.0★ from 113 Google reviews.
Based in Frederick
Ranked #19 because of its Google rating and review volume: 4.6★ from 86 Google reviews.
Based in Frederick
Ranked #20 because of its Google rating and trade focus: 4.6★ from 5 Google reviews, listed on Google as “Waterproofing service”.
Based in Silver Spring, 36 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “Waterproofing service”.
Based in Ashburn, 27 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 32 Google reviews, listed on Google as “Concrete contractor”.
Based in Sterling, 28 mi away
Ranked #23 because of its Google rating and review volume: 4.8★ from 378 Google reviews.
Based in Hanover, 35 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Waterproofing service”.
Based in Silver Spring, 34 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Waterproofing service”.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 111 ranked foundation repair companies here; the rest are on their profiles.
20 more foundation repair companies within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
National price ranges in USD, not adjusted for Frederick. 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 111 Frederick 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 Frederick 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 |