When you hear, say, "1000/sqm", which sqm are counted? Purely the actual livable rooms? What about toilets, halls, garage? Or simply the raw footprint of the house because 'cheap' rooms counter the 'expensive' ones and it all averages out in the end?   https://abi.bcis.co.uk/measuring_your_house/measuring.aspx seems to be saying 'raw footprint' - is that correct?   My current house design gross external size is 240sqm (not counting the loft).. but for example we have a double