Range from the cheapest cat flap installation £92 (Widex based in DA14) to the dearest cat flap installation £136 (E P Carpentry based in BR5).
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 TN13 by posting a job with HaMuch and we will send it to carpenter & joiners in TN13.