The typical cost per square metre for constructing an extension or conservatory is around Â£1,500 to Â£2,000 on average; another reason why a garage conversion is one of the most popular options for many people.he typical cost per square metre for constructing an extension or conservatory is around Â£1,500 to Â£2,000 on average; another reason why a garage conversion is one of the most popular options for many people.
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