Range from the cheapest cat flap installation £80 (M P M Joinery / Plastering based in ST3) to the dearest cat flap installation £160 (KML Plumbing & Carpentry based in WV6).
Comparing carpenter & joiners estimates for installing a cat flap gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to fit a cat flap in ST21 by posting a job with HaMuch and we will send it to carpenter & joiners in ST21.