Random rubble masonry uses stone broadly as it comes from the quarry, sorted and shaped only as far as the wall requires. It is the most economical way to build in solid stone and, in the right hands, one of the most attractive.
Because it does not require every block to be sawn square, random rubble makes good use of quarry output that would otherwise be wasted. The saving is real, but it is a saving in material processing, not in workmanship. The wall still needs correct bonding, proper hearting and honest mortar work, and that is where the quality is decided.
Random rubble is particularly well suited to retaining walls. We build with a batter leaning into the retained face, install weep holes at the base so water pressure can escape rather than build up behind the wall, and back the structure with graded free-draining fill. Most retaining wall failures we are called to inspect come down to blocked or absent drainage, not to the stonework itself.
Where budget or supply dictates a mix of stone, we set out the blend deliberately rather than laying whatever comes to hand. Distributing colour and size across the whole elevation keeps the wall reading as intentional rather than accidental.
