The SAG Trust Score & Certification System

No black boxes. Below is the exact methodology our engineers use — the same recorded inspection data always reproduces the same score.

How the score is calculated

1. Inspectors score 26 items from 0–5. Zero means an observed failure; five means excellent. Unchecked and Unavailable are recorded separately and cannot produce a completed score or report. Legacy zero ratings are disclosed as potentially failed or missing, not silently reinterpreted.
2. Each category averages its items. For example, if the 5 engine items score 4, 4, 3, 5, 4 — the engine average is 4.0.
3. Averages convert to weighted points. Points = (average ÷ 5) × category weight. Engine weight is 22, so a 4.0 average earns 17.6 points.
4. Points sum to a score out of 100. The total is rounded to a whole number and published with the full category breakdown.

85–100Excellent

70–84Very Good

55–69Good

40–54Fair

0–39Needs Work

60+Certifiable*

* Certification also requires a passing inspection result — score alone is not enough.

◆ Only authorised SAG inspectors may issue or renew certification.
◆ Certification requires a recorded inspection with result “pass” or “conditional” and a Trust Score of 60 or above.
◆ Certification expires 90 days after issue. Expired certificates are never shown as current.
◆ Every certificate links to its inspection record — fully auditable by the founder.
◆ Uninspected vehicles are never described as inspected or certified, and never show a Trust Score.
◆ Sold and reserved vehicles are labelled immediately and never presented as available stock.

Weights sum to 100. Each item scored 0–5 by the inspecting engineer.

Weight 22

Weight 16

Weight 12

Weight 12

Weight 10

Weight 10

Weight 8

Weight 10