Hi Lesley
Unfortunately I think your accountants are correct, as one of the main rules of the DIY scheme is that it doesn’t apply when the planning permission prevents the new dwelling from being sold or used separately from another property.
I appreciate it may seem unfair but the rules are there for a reason and in most cases, ensure that private housebuilders don’t get additional benefits than commercial housebuilders, who are also unable to recover VAT in similar situations.
I hope you’re able to find the finance to complete the project, I don’t know whether the planning office would consider changing the planning provisions so that your home can be sold/used separately from the other properties. It’s certainly worth asking the question.
Marie