Drainage for tarmac drives in County Down

How much does tarmac driveway drainage cost in County Down?

Rates in County Down follow Northern Ireland, about 12% below our UK midpoint.

Item	Guide price (inc VAT)
Linear drainage channel	£53–£106 per metre
Soakaway or crate unit	£570–£1,750 each

Towns we cover in County Down

Postcode areas: BT.

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 County Down

In Northern Ireland, more than 5 m² of hard surface in front of a house should be porous or drain to a porous area within the property; DfI Roads approves dropped kerbs. Any new or widened crossing over the pavement needs approval from DfI Roads.