A few things I,d mention here ( after a bottle of wine )
1) Put in your quote with a note "excluding any taxes" dont say you are vat registered unless asked.
Let them clain it back if they are enttled to it.
2) Some one said about new builds, its only the insides that come under this. Don,t blaim me or quote
me. But check it with hmrc to be sure.(I might be thinking of construction register )
3) Take the hit on vat but increase your price year on year.