It’s notable from this piece in the Guardian that the new London Mayor has identified viability appraisal as a priority in his broader housing policy.
Khan also plans to settle rows between councils and housebuilders about how much affordable housing could be built before a scheme becomes unprofitable. His team is working on creating a single system of viability assessments and to make the previously secret calculations public…”I am keen to make viability assessments transparent,” said Khan. “Some developers hire consultants and run rings round local authorities and we want to stop that happening.”
Clearly, the major goal here is to obtain more affordable housing. The stress on viability appraisals suggests that they are currently perceived as a major part of the delivery problem. Watch that space.