How we rate siding contractors
No pay-to-win, no mystery. Every company we score earns a number from 0 to 100, built the same way from public data and the weighted pillars below. Here’s exactly how it works.
The four pillars
A siding job lives or dies on installation detail and the warranty behind it — so our formula leans harder on manufacturer credentials and workmanship than a generic contractor list would.
Customer reputation
Aggregated star rating across Google, BBB and Facebook, weighted by review volume on a logarithmic curve — so a handful of perfect reviews can’t outweigh a long, consistent track record, and an established firm isn’t buried by a brand-new one.
Manufacturer credentials
The heart of a siding rating: manufacturer installer programs (James Hardie Elite Preferred, CertainTeed, the Vinyl Siding Institute, LP SmartSide, Mastic/Alside), plus state licensing and liability insurance. Certified crews install to spec and unlock the strongest material warranties.
Workmanship & warranty
Years installing exterior cladding, the breadth of materials a crew works in (fiber cement, vinyl, cedar, engineered wood), and the strength of the written workmanship warranty behind the labor.
Service & local fit
How rooted the company is in Southern New Hampshire, whether financing is offered, and how easy it is to reach, schedule and get a written estimate from.
Weights sum to 100%. The weighted total becomes the 0–100 score and the letter grade shown on every listing (A+ down to C).
Where the data comes from
We aggregate publicly available ratings — primarily Google, supplemented by BBB, Facebook and manufacturer installer locators. We don’t host or re-publish individual review text. Because review counts can be influenced by the businesses themselves, our reputation pillar weights review volume on a logarithmic curve: the jump from 5 to 50 reviews matters a lot; from 500 to 1,000, very little. That keeps an honest smaller installer from being buried by a high-volume competitor, without ignoring a long track record.
What we deliberately don’t do
- We don’t sell ranking position. A company can claim its listing for free; that never changes its score.
- We don’t invent data. Where a founding year, certification or warranty isn’t verifiable, we leave it blank and the score reflects the gap — we never guess in a company’s favor.
- We don’t show fake stars. The star rating on each listing is the company’s real Google rating, linked straight to Google so you can verify it. Our 0–100 score is shown separately as our editorial assessment.
- We don’t score on thin data. Companies without enough public reviews are listed unscored rather than given a misleading low grade.
See the method in action
We currently score 25 siding contractors across Southern New Hampshire.
View the rankings →