We would like to install a log burner in our lounge. The chimney is external and too narrow to accept the log burner. The external width is only 44" and I need nearer 60". Could a builder easily widen the bottom of the chimney breast so that the inside could then be made wide enough to accept the fire? Would he/I need planning permission or building regs? Is he likely to charge £500 or £1000? I've absolutely no idea about these things? Do I need to consider anything else? Many thanks.