Opt for modular extension
A prefabricated extension is certainly quicker and requires fewer tradespeople on site. The property expert Kunle Barker, brand ambassador for the modular company InFrame Space, says his firm typically completes a home extension in four to six weeks. he estimates a standard 3m x 9m rear permitted development extension on and Edwardian terrace would be between £48,000-£67,000 depending on specification.