Vat on own purchases in a company

[jambai]

Just wondering if you are a vat vendor and say you are a builder could you build yourself a house and claim the inputs but not have any outputs in no invoices for that house or if there are invoices issued just never pay them ( yes would push up company tax only if make a profit )- ok that is a larger scale but say you have a company that is vat vendor and your staff buy something for themselves which is kind of in normal course of business ( example tool at hard ware store ) - could you claim that vat back ?