VAT Help Page
Materials are deemed to be something that is part of the house / conversion and that they will remain with the property for the forseable future, this means that anything that is not part of the building you purchase or rent / hire you can not claim VAT back on.
Products that you can not claim VAT back on would be like the hire or purchase of a concrete mixer, porta-loo, tools and of course scaffolding.
We have put these VAT rules in very simple terms, you should get clarification and therefore please contact your local VAT Office, you can find your local office by visiting:http://www.hmce.gov.uk/business/vat/send-regn.htm
Many Self-Build publications have articles on VAT and Self-Build, look at our Links Page section and you will find the links to the most popular magazines.