The map should help. The green is in the upper right of the picture. The row of houses on the other side of the road have had some balls hitting them. A solution has been offered which involves routing the 18th down the adjacent hole, the 15th, and routing the 15th through the practise ground, but most don't want to lose the practise ground so we're just looking at other ideas.
The green is close to the wall, but the boundary wall doesn't run parallel to the hole. By moving the green backwards it's moving further from the wall, the information I'm looking into is how far would the green have to move back to virtually eliminate the risk of balls going over the boundary wall?
Netting has also been suggested but I think in order for it to be high enough the cost would be excessive and also quite unsightly.
My preferred option is moving the green 30 yards back and slighty right which would move the green approx 55 yards from the wall from the current 22 yards, moving the tee backwards and also moving the 15th green (middle lower left) towards the 16th tee (lower left). Will this virtually eliminate the risk?