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Thanks, but this is existing space, not a new extension, so not sure if I can take into account the window and door that this new larger patio door will be replacing?

Hi Can someone help me calculate whether or not my patio door will be too big for a room - as per building reg L1 maximum glazed area must not exceed 25% of floor area. Room width - 4650 mm Room depth - 2600mm (this is measured into the window sill) Size of glazed unit 3016mm Please...