If you do go down the small claims route make sure unless it is super clear you contracted with a limited company you put the claim against him personally particularly if he owns a house. At least you have his personal assets to go after. Do you know precisely whether it was a company you contracted with or the builder personally? Do you also have a specific postal address for the other party to the contract? dot and dab on tiles is sadly a tough argument to make: what you need is the tiles to start falling off.