john westmore wrote:
We wish to straighten and 'position correctly' the garden fence that we
share with a neighbour in an adjoining terraced house.

What is the best way to get the fence at exactly right angles to our houses?
The garden is about twenty metres long. Thanks for advice.


As others have said, the 3:4:5 triangle with a bit of string will do that.

However, it doesn't mean that it is necessarily the right place for the
fence.. With any luck, if you toddle up the garden you may find the
(remains) of the boundary marker. Which may be just a small wooden post
in the ground.

The original builders may not have been that precise with the right
angle as you seem determined to be. Your neighbour may not be too happy
if your efforts leaves the boundary post well and truly your side of the
fence.

--
Sue