Range from the cheapest cat flap installation £80 (1st Choice Property Maintenance based in NN18) to the dearest cat flap installation £260 (One Click Contractors based in MK4).
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 NN4 by posting a job with HaMuch and we will send it to carpenter & joiners in NN4.