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Just want a velux window, but need a fixed staircase, power and lighting. has someone got any hints, tips and idea of costs?

You should get a staircase made for between 800 and 1000 a velux window with flashings for 300 the electrical materials wont be that much a good honest local builder should charge you no more than 6000 to finish the job am in the building trade myself it should only take about 10 days