Range from the cheapest replacement of a door frame £187 (Acacia Gardens Ltd based in N13) to the dearest replacement of a door frame £350 (Propello based in E17).
Comparing carpenter and 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 N18 by posting a job with HaMuch and we will send it to carpenter and joiners in N18.

"Concerns our front door frame, wall plate and joist. Job is we need the small part of the wall plate & joist replacing, as well as the old damaged timber door frame taken out and replaced."
N17