"rbarbs" wrote in message
ups.com...
Hi,

My mother has a garden which has a fairly substantial slope (as above)
and is thinking of levelling it, and putting a supporting drystone
wall at the bottom (next to the drive). She is concerned about
drainage and cost.

I'd be concerned about stability. It wasn't clear how high exactly the
retaining wall would be but high retaining walls are not something you can
just throw up. It's going to need careful design to ensure the backfill
doesn't push the wall over. Try yellow pages for landscape engineer or
landscape architect. See if you can get one to do a free site visit and give
you a quote..

You would also need something on top of the wall to prevent people falling
onto the driveway from the lawn. Railings or similar. Those alone won't be
particularly cheap.

Any fence or wall more than 6ft tall needs planning permission.