Drainage is the only part of a job that is judged entirely in its absence. Done right, nobody thinks about it again. Done badly, it announces itself in the first sustained rain after handover.

Falls are not negotiable

A gravity line either has continuous fall or it does not. There is no partial credit. We set and check invert levels at every junction, and we re-check after bedding, because pipe moves when you compact around it.

Test before backfill, always

Once a trench is closed, a fault costs ten times what it cost to find while the trench was open. Every line we lay is pressure- or air-tested with the trench still open, and the result is recorded against the as-built.

Stormwater is a volume problem

Retention sizing follows the impermeable area you are actually creating — roofs, slabs, tarmac — not the area on the original plan. Sites grow during design. We resize before we dig, not after.

The buried work is the work you pay for twice if it is wrong. It is worth getting the falls right the first time.