How do I complain about a bad roofing specialist job?

Step 1: raise the issue in writing with the roofing specialist — email, not phone. Specify the defect, reference the original quote, and request a fix-or-refund within 14 days. Step 2: if no resolution, escalate to Relevant trade association — most UK trade bodies have a complaints procedure that members are obliged to follow. Step 3: chargeback (debit card) or Section 75 (credit card) if you paid that way. Step 4: small-claims court for amounts under £10,000. On TradeMatch you skip most of this — payments sit in escrow until you sign off, and our dispute resolution team mediates with both parties before any release. The funds protect your position throughout.