Benefits of own terms and conditions of contract
Before discussing how you incorporate your terms and conditions it is worth asking why you would want to. The answer is usually simple. You have a better chance of being paid promptly and in full. Also, perhaps there will be greatly reduced management and administration costs trying to get your money.
Usually unamended standard forms of contract are perfectly adequate. However, often changes are made which can be detrimental to you. Also, often you can be faced with terms that are not well drafted or dramatically favour the other side. In these circumstances, having a proper and balanced set of terms in place can benefit everyone.
You must have a contract in writing before it means that you can use the Construction Act (in UK).