Rogue traders are operating door to door in the Rugby area offering roofing and loft insulation work, warns Warwickshire Trading Standards.
The approach is usually to falsely claim that a few tiles are loose on a householders's roof before looking for more work they claim is needed.
Some residents have paid hundreds of pounds to have a few roof tiles replaced unnecessarily, and thousands more to replace perfectly adequate loft insulation.
The rogues often ask for cash up front for materials, but carry out little if any work (and none of value) before disappearing. They may be falsely claiming to represent nationally recognised building companies.
Residents are advised to never buy goods or services from doorstep traders.
If you have concerns, you can make a scam/rogue trader complaint to Trading Standards via Citizens Advice Consumer Service on 03454 040506.
You can also sign up to scam alerts at www.warwickshire.gov.uk/scams and use Warwickshire Trading Standards No Rogue Traders Here approved trader scheme.