I work out how long the job should take and charge £25.00 ph plus parts !!! If only half a days work £80-£100 and a full day £120-£220 depends on client, customers will try and knock price back every time !!! doing cheap jobs does you no favours as if it goes wrong in 12 months time they will still call you back mate and want it done for nothing when insurences ect are due you will regret working for peanuts i may be hard but i spent loads of money getting qualified not just do do other people favours with cheap jobs