The abrasive sequence depends on the accepted timber, existing finish and intended next product. A single aggressive pass is not a universal solution. The quote should identify the preparation goal rather than promise removal of every deep mark at any cost to the boards.
The final preparation should suit the selected oil or compatible coating. Decide that finish before the sanding scope is confirmed. Sanding, oiling and deck painting are separate tasks; list the required stages so exposed prepared timber has an agreed follow-on plan.
Railings, posts, corners and fixed furniture affect tool access. Include these in the dimensions and photographs. Hand-detail work around obstructions can change the scope, while inaccessible areas should be identified before assuming the entire deck can receive identical preparation.
Prepare and sand accepted sound boards with appropriate abrasive stages and dust control, within the agreed accessible area. Scope limits: Sound ordinary accessible boards only. No structural restoration, rot concealment, hazardous coating removal, asbestos or specialist dust remediation.