We are building a kitchen extension with a flat roof. I would like to fit a roof light. Having had a look at commercial roof lights I've not been impressed. The lower cost ones look cheap and the nice ones are really expensive. I'm thinking of welding up and aluminium or stainless frame and fitting a standard double glazed window with a third laminated or toughened glass panel over the top. Are there any regs that I need to look at or is it a complete non-starter. I've had a look through Part N and the thermal regs. I'm still at the thinking stage so ready to be knocked back.