Drainage for tarmac drives in Greater London

How much does tarmac driveway drainage cost in Greater London?

Rates in Greater London follow London, about 20% above our UK midpoint.

Item	Guide price (inc VAT)
Linear drainage channel	£72–£144 per metre
Soakaway or crate unit	£780–£2,400 each

Towns we cover in Greater London

Postcode areas: BR, CR, DA, E, EC, EN, HA, IG, KT, N, NW, RM, SE, SL, SM, SW, TW, UB, W, WC.

What is included?

Driveway drainage is the plan for where rainwater goes once it hits a sealed tarmac surface: the falls that move it, the channels or gullies that catch it, and the soakaway, border or approved drain that takes it away.

Falls set across the drive, typically 1 in 60 to 1 in 80
Linear channel at garages, doors or the bottom of a slope
Soakaway or crate unit sized to the area and ground
Runoff directed to borders or a permeable strip
Connection to an existing surface-water drain where allowed
No connection to the foul sewer

Rules in Greater London

In England, a new hard surface over 5 m² in front of a house needs planning permission unless it is porous or drains to a lawn, border or soakaway within the property. If the job needs a dropped kerb, the highway authority (the county or unitary council) approves it before any work on the footway.

How it is built