Range from the cheapest replacement of a door frame £130 (Building and Plastering Solution based in SE5) to the dearest replacement of a door frame £400 (Soceanu Construction Ltd based in SW18).
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 SW3 by posting a job with HaMuch and we will send it to carpenter and joiners in SW3.

"Inside kitchen sliding door frame to be replaced. (sliding door frame to be provided). Painting of frame and skirting board. Can you please provide full quote."
W8
"New internal door frame possibly internal door fitting too"
SW8