Drainage for tarmac drives in Hertfordshire

How much does tarmac driveway drainage cost in Hertfordshire?

Rates in Hertfordshire follow the East of England, about 5% above our UK midpoint.

Item	Guide price (inc VAT)
Linear drainage channel	£63–£126 per metre
Soakaway or crate unit	£680–£2,100 each

Towns we cover in Hertfordshire

Postcode areas: AL, CM, EN, HA, HP, SG, WD.

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 Hertfordshire

In England, householder permitted development (Class F of the 2015 General Permitted Development Order) lets you lay a hard surface in front of a house without planning permission if it is porous, or if the rainwater is directed to a permeable area within the property. If the area is more than 5 m² and neither applies, you need permission. Standard dense tarmac is not porous, so a dense tarmac drive needs a lawn, border, channel to a soakaway or other permeable route for its water. 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