Can screening be added beside an existing sitting area?
A screen can target a particular sitting area without necessarily replacing the whole boundary. Mark the view you want to interrupt while seated and consider light, movement and the effect from adjoining areas. Its supports and any connection to decking need assessment, with relevant restrictions checked. Decide position before height; the largest screen is not automatically the most useful solution for a compact space.
Should a deck meet the lawn with an unfinished edge?
The intended perimeter should be specified. Its construction and appearance affect the handover and future care of adjoining areas.
Can old posts remain when panel style changes?
Only if suitable for the proposed arrangement and condition. Reuse needs assessment before it is relied upon in the quotation.
Can a screen be added without replacing the deck boards?
It may be possible, but the fixing and support arrangement must be established first. The existing deck's condition, access below it and the proposed screen all matter. Ask which boards may need lifting and how they will be reinstated. If matching replacements are unavailable, discuss the appearance of the repair before authorising work rather than discovering a visible mismatch at completion.