OUR TOP TIPS:
Check for membership of trade bodies. Reputable companies are often members of trade bodies. Check for proof of membership, if you are unsure, contact the trade body directly, such as the CIPHE.
Never accept a verbal estimate. Insist on a written quotation. Quotes should be written on headed paper with an address and telephone number, not just a mobile number.
Request written confirmation. If you accept the quote, request written confirmation, Installer Network Members expect to provide this.
During peak season, reputable installers are in demand and may require several weeks' notice.