estimate cost of building an extension to a home
Most builders can give you an idea of what your extension will cost per square foot or metre. For example, a basic single storey extension would typically cost around Â£1,000 per square metre but it could be up to Â£1,600 or more for a premium two storey extension.ost builders can give you an idea of what your extension will cost per square foot or metre. For example, a basic single storey extension would typically cost around Â£1,000 per square metre but it could be up to Â£1,600 or more for a premium two storey extension.