Tue, 09 Jun 2026 09:26:52 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4216&Focus=56981#Comment_56981 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4216&Focus=56981#Comment_56981 Tue, 30 Jun 2009 21:18:07 +0100 mitchino
We are planning to put a large (6m x 2m) lift and slide door set in the south facing wall of our sitting room. Can anyone help me understand the building control restrictions on new window openings?

I'm told that the total amount of windows can't exceed 25% of the floor area. We live in a two storey house - do both floors count? And how do you do the maths? Do you just total up the floor area, and then add the total area of the windows and work out the percentage?

I think what's confusing me is why it's the floor area and not the wall area.

In Scotland BTW in case the rules are different.]]>