Record the existing space
Photograph the whole deck from the yard, its connection to the house, stairs and accessible structure below. Do not enter an area that appears unstable to obtain a photo. Note approximate dimensions, height and the routes people use.
For new construction, record the house door and the proposed location. Include grade changes and working access. Photos explain context, but they do not replace measurements, drawings or an on-site assessment of concealed conditions.
Describe the intended result
Decide whether the main goal is a new surface, a different layout, better access, overhead shelter or a full structural rebuild. List furniture and activities so the usable footprint can be considered.
Note material preferences and your willingness to maintain wood finishes. Identify optional features such as drainage, lighting and privacy screens. Separate priorities from choices you are still comparing so the estimate can show useful alternatives.
Ask what the written proposal will resolve
Confirm the parts being kept or replaced, the product details and the responsibility for approvals. Ask how hidden damage and scope changes are handled. Discuss site access, cleanup and the documents supplied at completion.
Compare proposals against the same intended outcome. If one contains different structural work or finish details, resolve that difference before comparing only the final number. Keep drawings and product documents with the project records for future maintenance or changes.