by spidersong on Thu Dec 29, 2011 3:00 pm
The DIY scheme requires you to construct a house 'otherwise than in the course of business', so both houses (assuming you're not charging your son for the building works) can be recovered under the scheme even where you yourslef will only occupy one. You will need to make sure that there are no occupation or disposal restrictions i.e. the houses can be sold independantly, but other than that it should be quite straightforward.
As long as it's not the intention from the outset to sell then there's no claw back of previously paid VAT, so if your son decides to move out a few months, weeks, or even days after you finish the project and you have to sell the house then it's still recoverable.