Range from the cheapest Fit a radiator £90 (Erjon Dulaj based in N16) to the dearest Fit a radiator £240 (FixGas based in N4).
Comparing heating engineers estimates for fitting a new radiator in N5 gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes. Radiators vary in price, and additional hours will be required to make pipework changes.
What to do - Get rates and quotes for removing your old radiator and replacing it with a new radiator by posting your job to heating engineers in N5.

"Replace a radiator in my bathroom "
N1
" To remove the old radiator and replace it with a new one "
N1