The Town and Country Planning (General Permitted Development) (England) Order 2015 No. 596

SCHEDULE 2 Permitted development rights

PART 7 Non-domestic extensions, alterations etc

Class J – hard surfaces for industrial and warehouse premises

Conditions

J.2  Development is permitted by Class J subject to the following conditions—

(a) where there is a risk of groundwater contamination the hard surface must not be made of porous materials; and

(b) in all other cases, either—

(i) the hard surface is made of porous materials, or

(ii) provision is made to direct run-off water from the hard surface to a permeable or porous area or surface within the curtilage of the industrial building or warehouse.