Range from the cheapest cat flap installation £46 (J.r joinery services based in LN4) to the dearest cat flap installation £320 (2man's building company based in PE1).
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 PE10 by posting a job with HaMuch and we will send it to carpenter & joiners in PE10.