Hi Ged,
The conditions that need to be met in order for the renovation of an empty residential premises are shown in our published guidance which the supplier should read and apply to the supply they are making. The guidance they need to refer to is in notice 708 section 8 and this can be viewed here:
8. Reduced rating the renovation or alteration of empty residential premises
We do not issue a confirmation regarding this as it is the supplier’s responsibility to check the guidance and charge the appropriate rate of VAT for the supplies they are making. If the supplier has read the guidance and is still unsure whether the work qualifies, they should contact the VAT helpline on this link:
VAT: general enquiries with any specific questions they may have.
Thank you.