What is a deck?

A deck is a framed structure with a flat surface capable of supporting weight.

Typically constructed outdoors, elevated from the ground and connected to a building, decking is used for entertaining and private leisure.

General requirements for decks


The National Construction Code (NCC) requires any deck, regardless of height or size, to be setback a minimum of 900mm from any boundary for fire separation purposes.

Deck heights

Any proposed deck raised more than 0.5m above natural ground level and with a setback distance of less than 7.5m to an adjoining property boundary, requires planning approval or the installation of screening. Screening must comply with 5.4.1 Visual Privacy of the Residential Design Codes for single dwellings.

Decks exceeding 1m in height require balustrading to comply with the National Construction Code (NCC).

Timber framed desks

Must be designed and constructed in accordance with AS 1684.2-2010 (Residential Timber-Framed Construction).

The plans provided should clearly demonstrate compliance with the above standard. Structural Engineer’s details may be required for timber framed decking, however it will be at the discretion of the Building Surveyor assessing the plans as to whether it is required.

Steel framed decks

Is to be designed and certified by a registered structural engineer.

Decking in bushfire prone areas

Decking proposed within 6 metres of a residence (Class 1 building) is required to be constructed according to AS 3959 if:

  • The associated residence was constructed 2014 or later, or
  • The proposed decking building works exceeds $20,000.

Installing a deck

Step 1: Apply for a building permit

You will need to complete an Application for building permit – uncertified (BA2).

Ensure you include:

  • Site plan to scale showing setbacks and location of proposed deck
  • Elevations and heights of the proposed deck
  • Structural certification of the proposed deck

Refer to Building Permit Fees and Calculator

Step 2: Assessment

Building permit applications either certified or uncertified are usually assessed and approved within 10 business days.
Building permits are sent to the builder via post.

Step 3: Submit a Notice of Completion

Under the Building Act 2011, the owner or builder must notify the Shire that the work is completed by submitting a BA7 Notice of Completion Form, which is attached to the building permit.

More information and contact

For more information, please refer to Balconies and decks – A guide to maintenance (produced by the Department of Mines, Industry Regulation and Safety, or contact Building Services on 9290 6660 or email shire@mundaring.wa.gov.au.