Hi. My name is*****'m looking at your question now and will post my answer or ask for more information here in a short while.
Unless it is your intention to live in the property yourself or it will be occupied by relatives, you cannot reclaim the VAT on the materials I'm afraid. Take a look here and here for more information.
Clearly, you cannot be expected to live in the property for the rest of your life necessarily but there is no set period that you need to live there. However, you should not advertise it for letting whilst you are in the process of the build as that will almost certainly scupper a claim if HMRC get wind of it.
I hope this helps but let me know if you have any further questions.
Would you mind rating my answer before you leave the site please.