Drainage for tarmac drives in Cornwall

How much does tarmac driveway drainage cost in Cornwall?

Rates in Cornwall follow the South West, about 3% above our UK midpoint.

Item	Guide price (inc VAT)
Linear drainage channel	£62–£124 per metre
Soakaway or crate unit	£670–£2,050 each

Towns we cover in Cornwall

Postcode areas: PL, TR.

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 Cornwall

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. Any new or widened crossing over the pavement needs approval from the highway authority (the county or unitary council).