There are calls for an investigation in to WA's Building Commission after it emerged it had failed to detect that Perth construction company BuiltonCorp was in financial trouble when it audited the group only weeks before it went bust.

Building Commissioner Peter Gow has confirmed the body audited Builton in November last year. Work stopped on more than 100 home building sites around Perth when the company went into administration a fortnight ago, reportedly owing $33 million and leaving 38 staff unemployed and about 350 unsecured creditors. “We had…