Range from the cheapest window sill replacement £260 (Building and Plastering Solution based in SE5) to the dearest window sill replacement £560 (Carpentry & Building Services based in SW2).
Comparing carpenter and joiners estimates for replacing a window sill 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 window sill in Tulse Hill by posting a job with HaMuch and we will send it to carpenter and joiners in Tulse Hill.

"2 Sash windows (4 panes) with rotten parts needing repair"
SE24
"Window sill replacement out window sill, rotten - landing window - now causing a leak running down under stairs when rains. "
SW4