A one-page quote with a single number on it is not an estimate, it is a hope. It gives you nothing to compare against another bid, and it gives the contractor room to discover extras later.
Our written scope lists what is included, what is specifically excluded, and what sits under an allowance with the allowance figure stated. If you are choosing between us and another company, ask them for the same thing — the comparison becomes straightforward the moment both are itemised.