question about house construction- since we have a ballpark figure/estimate based on area, do we include open spaces like garage, terrace, balcony into the equation? lets say. my proposed residence is 185 sqm, but including the open spaces mentioned earlier, this would amount to 220 sqm. So if 15k per sqm, do we > 185 sqm x 15? or 220 x 15k? thanks!