In Texas, the Seller's Disclosure Notice is a legally required document for most residential property sales. Let's dive into some of the FSBO paperwork that will be necessary when legally selling a house without an agent's help.A For Sale By Owner contract Texas must include: 1. The Purchase Price, 2. This FSBO paperwork is needed as soon as you accept an offer, so it's useful to have a purchase agreement onhand that you can fill out quickly.