93.1review score /100
Portland, OR / Exterior & structure
Licensed Foundation repair companies in Portland
Ranked after matching the required license records.
The short answer
Highest scoreTerraFirma · 93.1/100
Most Google ratingsTerraFirma · 947
Record snapshotNovember 9, 2026 · 11 compared
- 1 Match dated source records.
- 2 Apply the published formula.
- 3 Show the sources and gaps.
What we check: Google listing 11/11 · Oregon CCB 11/11
| Source | What it shows | Coverage | Source dates |
|---|---|---|---|
| Google listing | Listed contact details, rating, count and review date | 11 / 11 | 2026-11-09 |
| Oregon CCB | Dated license, endorsement, bond and insurance fields | 11 / 11 | 2026-11-08 |
Not checked: workmanship, price fairness or first-hand testing.
Not checked: workmanship, price fairness or first-hand testing.
The 11 ranked records
License records matchedEvery score uses the same published formula: Google rating, rating volume and newest review date. It is not a test of workmanship or safety. Active Oregon CCB record checked. Exact specialty work and individual credentials must still be confirmed. Scoring formula.
The listing categories can include concrete and waterproofing businesses. Confirm that the company handles the specific foundation problem and any engineering required.
90.2review score /100
82.1review score /100
79.8review score /100
76.0review score /100
75.6review score /100
72.4review score /100
Keystone Concrete Driveway Retaining Wall Foundation Contractor-Lake Oswego/West Linn
Record & score ↗54.7review score /100
51.1review score /100
43.8review score /100
30.4review score /100
Compare the full ranking
Download CSV ↓| Rank | Business | Score /100 | Google rating | Ratings | Newest review |
|---|---|---|---|---|---|
| 1 | TerraFirma | 93.1 | 4.8 | 947 | 2026-11-06 |
| 2 | Ability Plus Drainage Company | 90.2 | 4.9 | 206 | 2026-11-02 |
| 3 | Stillwater Leveling | 82.1 | 5 | 73 | 2026-10-07 |
| 4 | TOA Concrete Construction LLC | 79.8 | 4.9 | 78 | 2026-09-10 |
| 5 | Masonry Waterproofing, and Drainage Masters | 76.0 | 4.8 | 71 | 2026-10-05 |
| 6 | Cretec Concrete LLC | 75.6 | 4.7 | 68 | 2026-10-11 |
| 7 | TopLine Builders & Renovation | 72.4 | 5 | 23 | 2026-11-06 |
| 8 | Keystone Concrete Driveway Retaining Wall Foundation Contractor-Lake Oswego/West Linn | 54.7 | 4.9 | 21 | 2025-02-10 |
| 9 | Space Down Under 3.0 LLC | 51.1 | 4.1 | 34 | 2026-08-28 |
| 10 | Advanced American Construction Inc. | 43.8 | 5 | 3 | 2026-09-23 |
| 11 | R & R Maintenance and General Contracting llc | 30.4 | 3.3 | 7 | 2026-09-28 |
Method reviews-1.0
How the score is calculated.
Each business receives the same calculation. The rating, volume and recency components follow our electrician formula, then normalize their 70 available points to 100. License history and bond/insurance points are not used here. The original Oregon electrician comparison uses additional eligibility and license components, so its score is not directly comparable to this review-data score.
Rating · 35 points: with n ratings and average r, adjusted rating a = (n × r + 10 × 4.0) ÷ (n + 10). Points = 35 × clamp((a − 3.5) ÷ 1.5, 0, 1). With zero ratings, award zero.
Volume · 25 points: 25 × min(1, log10(1 + n) ÷ log10(501)).
Recency · 10 points: newest review within 30 days: 10; 90 days: 8; 180 days: 5; 365 days: 2; older or no ratings: 0.
Final score: 100 × (rating + volume + recency points) ÷ 70. Display one decimal; sort by the unrounded value. Ties use more Google ratings, then the lower numeric Google listing ID.
A missing review-date retrieval excludes a rated listing until resolved; it does not become a zero. No ratings earns zero. Credential matching is separate context and does not affect this score. No score or rank is changed by hand. This is a public-review-data comparison, not a workmanship or safety assessment.
Before you hire
Compare the same scope.
Give each business the same project description, photos and address. Ask for written answers.
- 01
What investigation supports the proposed repair?
- 02
Is independent engineering needed for this scope?
- 03
What does the warranty cover, and can it transfer to a buyer?
How to check Oregon foundation repair companies records
Active Oregon CCB record checked. Exact specialty work and individual credentials must still be confirmed.
Project costs in Portland
This dataset does not contain sourced local service prices. We do not publish an estimated local price range from ratings or license records. Ask each business for a written price for the same scope, including labor, materials, permits, travel, exclusions and change orders. Compare the total and the included work.
Frequently asked questions
How were these Portland foundation repair companies ranked?
The 11 records use the published rating, review-volume and review-recency formula. The page states the credential checks completed for this trade. A review-data score is not a service-quality test.
Does a place on this list confirm current availability or coverage?
No. These are dated public records. Confirm service to your street address, the exact work, current license status and availability directly with the business.
Can a company pay for a higher rank?
No. Nobody pays to change a score or numbered position. Any separate promotional feature is disclosed and excluded from the scored comparison.
Update log
: source snapshot used for this comparison. The linked profiles and downloads identify the collection dates for individual facts.
: this page was built from that snapshot. Content changes do not establish a new data collection.
Review before the next publication is planned monthly; no automatic refresh date is claimed.
Selection, sources and limits
We collected 100 Google Maps results for “foundation repair contractor” using the Portland search location on November 9, 2026. We kept matching service categories with an explicit Portland, OR listing address, no closed marker and complete rating/date inputs. Shared identities are deduplicated. The source directory contained 17 entries; 6 were held out and 0 promotional features were separated. 6 additional records did not pass the required credential match. This search sample is not a complete market census.
Each profile links to the original listing and any matched official record. Review text and reviewer details are not collected. Newest review dates and individual fact dates are shown in profiles. The required license records passed the published matching gate. Complaint histories and specialist qualifications beyond that gate have not been checked. A missing match does not establish a problem with a business.
Crewsive LLC publishes this comparison. Scores and positions cannot be bought. Promotional features are separate and excluded from the numbered ranking. Known client relationships are disclosed. Funding disclosure · Source data · Corrections.
Use this reference
Cite this page
Crewsive LLC. “Best Licensed Foundation repair companies in Portland, OR (2026): 11 Reviewed.” Portland Oregon Reviews. Content updated 2026-11-10. https://portlandoregonreviews.com/foundation-repair
For ranking data, also state the data snapshot date (2026-11-09) and method version. A citation is a reference, not an endorsement.