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Doubleglazing of wooden framed windows in flat

I'm seeking sensible quotes for double glazing on wooden window frames in my living area and bedroom for my small flat. I would be interested in doing the work in stages if possible. I've sought advise from a glazier (family member) who suggests either a builder, carpenter or glazier can do this work and recommends getting quotes for: Option 1 Routing/widening each timber rebate. Option 2 Aluminium adaptor frame/Retro fit. I also am considering double glazing for 4x panelled front & back doors in same living area. regards Raewyn