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Six signals, each weighted by how reliably they predict good work. Click to open the breakdown.
Limited verification · Basic tier
Weakest signal: Reviews & rating (0/100)
Δ +12.1 — additional adjustments from manual review applied to the canonical score.
Basic (30–59). Listed installer with enough verifiable signals to appear in the directory. Ask for proof of brand training before booking.
Read the full methodology — how we source, weight and audit every signal.
Certified to install STEK.
Cornwall PPF is a listed PPF installer based in Callington. Their certification is cross-checked against STEK's own UK installer locator.