Currently, the construction of timber decks is usually considered under the planning and building control procedures that apply to the construction of private patios, terraces, and pool surrounds.
Deck structures are often considered to be exempt from planning regulations. This is not always the case. There are a number of specific instances where consent is required prior to building a Decking System and these are set out below:-
Where the deck is situated within 20 metres of a highway
Where the deck is at 1st floor level or above
If any part of the deck construction exceeds 3m height.
If the structure would affect the amenity value or privacy of
neighbouring properties.
If the deck is attached to a listed building or situated in a conservation
area or National Park
Other restrictions have been known to apply, including limitations to the overall deck area in relation to the existing property or garden area and the constraints of established building lines.
Where the deck is situated within 20 metres of a highway 
