The back wall, and yard, of our house is perfectly positioned facing due South and gets the benefit of full sun. But my wife does not want to loose what little yard space we have left to more fig trees, so I'm thinking it's espalier time...

How close to the foundation can I plant?
(We have a slab on grade)

Can I place screw eyes into the brick and run wire between them, or should I install free-standing trellis a few inches out?
(How much weight actually bears on the trellis?)

What is the  optimal spacing between plants to maximize fruit production in the minimum space?

Anything else I should be concerned with?

I have no experience with an espalier but I would think right againt the brick might cause some issues such as mold from leaves not drying or possibly overheating of some vegetation touching the bricks. Just some thoughts.

I have a 11' tree 18" from my house: been ther 20+ years, so plant as close as you like.

I agree with Jon as I have 3 trees growing next to my house that are over 20 years old.

Jack