Do You Need Council Approval for a Deck in NSW?

In NSW, a deck under 1 metre above ground level, up to 25 square metres in area, does not usually require council approval provided it meets all Exempt Development conditions. Decks that are higher, larger, close to a boundary, on a heritage-listed property, or within pool safety zones will require either a Complying Development Certificate or a full Development Application. Get the classification right before you start designing, because the difference between a compliant and non-compliant deck is not always obvious.

The rules for decks in NSW are set at the state level through the Exempt and Complying Development Codes SEPP, then filtered through your local council’s controls. On the Northern Beaches, additional overlays for coastal hazard, bushfire and vegetation protection can lower the approval thresholds.

The three deck approval pathways

Exempt Development. No approval needed. Applies to small, low, straightforward decks that meet every exempt condition.

Complying Development Certificate. Fast track approval, typically taking two to six weeks. Suits most residential decks up to around 40 to 60 square metres, at moderate heights, on straightforward sites.

Development Application. Full council assessment. Required for larger decks, elevated decks with significant view or privacy implications, decks in heritage or coastal zones, or decks that do not fit within complying development standards. Adds eight to sixteen weeks to a project.

When your deck can be Exempt Development

To skip approval entirely, a deck typically must meet all of the following. It is no more than 1 metre above natural ground level at any point. It is no more than 25 square metres in area. It is behind the building line and not in front of the primary street frontage. It is at least 900mm from any side or rear boundary. It is not within a heritage conservation area or on a heritage listed property. It is built using durable materials to a workmanship standard. It does not overlook or invade the privacy of a neighbour.

These conditions have to all apply. Miss any one of them and you drop into CDC or DA territory.

The height problem

The 1 metre height rule is measured from the deck surface down to natural ground level. On a sloping block, one end of a deck can be well within the 1 metre limit while the other end is 1.5 or 2 metres above the ground. That deck no longer qualifies as Exempt Development and needs a CDC or DA.

This trips up a lot of Northern Beaches homeowners because so many sites are sloped. If any single point of your deck goes over 1 metre off natural ground, engineering and formal approval are involved.

Heritage overlays

If your property is in a heritage conservation area or is individually heritage listed, exempt and complying development options are usually not available for decks. You will typically need a full DA, with heritage impact statements, sympathetic material choices and often a longer assessment process. This is common in older parts of Manly, Mosman and pockets of Avalon.

Pool proximity rules

If your deck sits within the pool safety zone, that is within 1.2 metres of a pool fence or gate, or forms part of the pool barrier itself, it must comply with NSW pool safety requirements. This includes the non-climbable zone rule, which prohibits anything that could be used as a foothold within 900mm of the pool barrier.

Decks around pools frequently need pool safety inspection and certification. If you are building a pool deck, factor this into your scope. See our pool landscaping page for how we handle pool safety compliance as part of full pool surround builds.

Bushfire prone areas

If your property is bushfire prone, decks near the house must be built to the appropriate Bushfire Attack Level. This means specific material choices, gap tolerances and often full BAL 12.5, 19, 29 or 40 compliance. Bushfire assessment is a separate report and cost, typically $600 to $1,500. Parts of the Northern Beaches, particularly bushland pockets in Avalon and Palm Beach, are BAL rated.

Practical checklist

Before committing to a deck design, work through these questions. Is any part of the finished deck more than 1 metre above natural ground level? Is the deck larger than 25 square metres? Is the deck within 900mm of a boundary? Is the property in a heritage conservation area? Is the deck within the pool safety zone? Is the property in a bushfire prone area? If you answered yes to any of these, plan for approval and engineering as part of the scope.

At Podology, we design and project-manage decks across the Northern Beaches. We handle approvals, engineering and pool safety compliance as part of the build. See our decking Northern Beaches page for examples, or read our related post on decking cost per square metre in Sydney. If you are also considering material choices, see hardwood vs composite decking for the Northern Beaches.

Frequently Asked Questions

Can I build a small deck without any approval?

Yes, if it meets all Exempt Development conditions: under 1 metre above natural ground level, under 25 square metres, at least 900mm from boundaries, behind the building line, not in a heritage or bushfire zone. If your site does not tick every one of those boxes, you need a CDC or DA.

What happens if I build a deck without approval?

Council can issue an order to demolish or modify the deck. Non-compliant structures also show up on the Section 10.7 certificate when you sell, which can affect the sale. Bringing an unapproved deck into compliance retrospectively is usually more expensive than getting the right approval the first time.

Do I need approval for a low ground level deck?

If the finished deck surface is no more than 1 metre above natural ground level at any point, is under 25 square metres, at least 900mm from boundaries and meets all other exempt conditions, no approval is required. Very low platform decks close to ground level are the least likely to trigger approval requirements.

How much does deck approval cost?

A CDC typically costs $1,500 to $3,500 including certifier fees. A DA usually costs $2,000 to $6,000 or more depending on the council, the size of the deck and whether specialist reports (bushfire, heritage, engineering) are required. Add engineering costs of $800 to $2,000 for structural design.

Does a deck attached to my house need approval even if it is low?

The rules are based on the deck itself, not whether it attaches to the house, though attachment affects the structural design. A low, small deck attached to a house can still qualify as Exempt Development if all conditions are met. Larger or higher attached decks generally require CDC or DA.