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Add/increase opening windows to existing aluminum joinery

Seeking cost effective options for increasing the amount of openable windows space within existing aluminium joinery. Required for 3 - 5 windows - sized 1150 tall, --- wide. Existing opening windows are top hinged (approx. 260mm tall). Flexible with the increased size/quantity of openable windows. Will consider replacement with second hand joinery but prefer to modify existing if possible. Works need to be completed between 27th March and 11th April if possible.