Pool placement
A dimension for the water, the edge you touch, and the ground that has to remain.
Who decides the pool size?+
You do, before the picture. Pool size, coping, and surrounding ground are the brief. An unsized sheet of water is not a design.
What is coping?+
The finished rim a foot meets: stone, concrete, or a flush edge. It marks the pool size. It is not a border that makes the water bigger.
Can the water touch the house?+
Not by default. The house stays, with ground between the wall and the coping unless you have a real detail that says otherwise.
Do trees stay if they shade the lane?+
Yes. House, boundaries, and trees stay. Shade is a consequence of a tree you locked, not a reason to delete it.
Can the boundary move for a longer lap?+
No. Boundaries stay. If the pool size does not fit inside them with surrounding ground left, reduce the size.
Does a larger sheet of water count as a bigger pool?+
No. The size you state is the water. Coping marks that size. It does not enlarge it.
Can the house and the trees be read from this photo?+
Only if the frame includes the wall, the trunks, and enough of the lot to judge the size. A close crop of lawn hides the stops this page is supposed to keep.