Range from the cheapest replacement of a door frame £150 (Rafs based in ME15) to the dearest replacement of a door frame £223 (MATT CLARK JOINERY based in DA11).
Comparing carpenter & joiners estimates for a new door frame 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 replace a door frame in ME8 by posting a job with HaMuch and we will send it to carpenter & joiners in ME8.