I am about to send a letter to a building company who did faulty works, along with evidence from another specialist firm who assessed and repaired the issue.
I was unable to get any response from the original builders when works urgently needed to be rectified and so could not give them an opportunity to come back and make good themselves. In any case, I think they'd have done another botched job.
However, I'm worried about an issue. The original builders did not charge me VAT as they were a new company just starting out and hadn't yet earned enough to pay VAT. However, part way through the works, they crossed that VAT boundary and so back dated their invoices to keep my costs down and to save them the hassle too.
Can they now counter my claim against them, for faulty works, by requesting I now pay VAT on the building works, which will come to more than I'm claiming from them?