The RIBA president says he has persuaded John Bourn, the government's auditor general, to publicly back his statements about putting high design standards at the heart of PFI.
Pringle claims that Bourn agreed at the Office of Government Commerce's Smarter Construction Conference to add a seventh point to his six-strong list of 'factors for a successful construction project'.
This new 'Seventh' - which will be added to the likes of 'establishing effective programmes' - reads: 'achieving an accurate brief with an appropriate and high-quality design'.
Pringle said winning the support of such an 'influential individual' was a major success for his campaign.
'I'm absolutely delighted that a man like John Bourn has said he agrees with us; that's significant step forward,' he said after the conference.