Can I Use a Square Metre Price to Estimate the Cost of My Project?

Generally, the price per square metre goes down with the size, because there are quite a few fixed costs associated with each custom home project, but documentation for tricky small home extensions can be significantly higher than documentation for a large simple house … The widest fluctuation on prices is with house extensions. The most expensive are second-Storey additions. To justify the cost, we should only consider them when all other options are exhausted. Ground-floor additions are obviously less expensive.