hand bags away
first question should be ... how much you need an hour to earn what you want to earn?
then how many 3 bed semis can you do in an hour?
if its 4 , then base your answer on 3
if its 5 then base your answer on 4 ( to make allowances for mishaps ) ie phone calls etc
the reality of what you want to achieve per hour needs to be in line with where you live , and what others charge ?
if you are well established and you can afford to not lose work , then you can price at the higher end . ( more than what you need )
if you are needing the work , then be competitive but dont under sell yourself
also ... take no notice of the clowns on this forum , that arent vat registered but earn silly ££££ per pop . its not real