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Building a house extension can create valuable living space and may increase the value and enjoyment of your property. However, the total project budget is rarely limited to the builder's main construction quotation. Homeowners may also need to allow for professional fees, statutory approvals, VAT, surveys, London access costs, client-supplied finishes and unforeseen existing conditions. These costs are not necessarily being "hidden" by a contractor. Many sit outside the agre

The short answer is that there is no reliable extension price based on floor area alone. For early budgeting in London, however, a sensible allowance for the main construction work is approximately £3,000–£5,000+ per square metre, excluding VAT and professional fees.

Imagine playing a football match where the other team brings their own referee. Even if that referee promises to be fair, you know the...