Its best to seek an accountants advise in any tax issue as there are often ways to avoid (not evade) tax through 'jargon' and good planning.
I bought our smallholding as a business, but only the land and outbuildings could be funded with money from my business accounts and resources. The house itself had to be in my personal name and funded from cash outside the business. However this was mainly because my business is a Ltd company and a legal entity on its own.
One option I was given was to buy completely as a business then buy the house off the business, this would have meant I could have had renovations as business expenses - but then the new valuation of the property when I came to buy it off my business would have been reflected in that price.
I own my own Ltd company, but even so it cant buy me a house to live in as its a benefit in kind, which is illegal.
There are also funny rules in VAT stuff and renovations. One being you cant claim VAT back for new fencing but you can for repairs of fencing. You can't claim VAT for a building renovation (without abiding by a strict set of rules) but you can for a new build.
A good accountant will be able to take you through all this as its a minefield for the normal person who just wants to get on life, growing and living
Dont be frightened by it all though - VAT registration is the way forward if your spending alot on VAT'able goods, at least you have the option of trying to claim them back. Keep all your receipts and your accountant will explain the terminology of how to explain how everything was spent and for what reason.
Ta
Baz