Terrace questions
A threshold, an outer edge, and shade that makes the ground an outdoor room.
Is a terrace a balcony with more plants?+
No. A balcony is a shallow railed slab off an upper floor, planned on the balcony page. A terrace is on grade or a platform, with a threshold and an edge you step off.
Can furniture sit against the house door?+
Not on the threshold. Leave the sill and the first step clear. Seats begin after that crossing.
The terrace is a platform above the yard. Is the drop a balcony rail?+
Keep the level change you have. A guard at a real drop can stay, but the room is still a platform on the ground side of the house, not an upper-floor balcony.
There is no shade in the photo.+
Name one: a roof off the house, a pergola, or a tree you are willing to keep. Without shade, do not pretend the open slab is a room at noon.
Can the lawn be drawn flush so the step disappears?+
No. The level change stays readable. People need to see the step down to the yard or up onto the platform.
How is this different from a patio or a deck?+
Use the patio page for a broad outdoor floor that is not asked to be a room at the door. Use the deck page when the boards and the structure are the subject. This page is the outdoor room at the threshold.
Can the threshold be drawn from this photo?+
Yes. The photograph supplies the door, the outer edge, and the level change. The plan does not turn that ground into an upper-floor balcony.