Some decks can be built without approval, some need a Complying Development Certificate, and some need a full development application. The deciding factors are usually height, floor area, distance to boundaries and whether the deck interacts with a pool fence.
This is a general guide only — always confirm with your local council or a private certifier before work starts. Requirements differ between Central Coast Council, Lake Macquarie and Hornsby Shire.
Exempt development
Low-set decks that stay under the height and area limits in the NSW Codes SEPP, sit outside required setbacks and don't affect drainage or a pool barrier can often be built as exempt development, with no certificate needed.
- Low floor height above natural ground level.
- Modest floor area, and it must not be built over an easement.
- Clear of boundary setbacks and not attached in a way that affects the building's structure.
Complying Development (CDC)
Once a deck goes higher, larger, or gets a roof or pergola over it, it commonly falls into complying development. A private certifier can issue a CDC without going through a full council assessment, which is usually the faster path.
Full development application
A DA is generally needed where the deck breaches the complying development standards: significant height, overlooking neighbours, heritage listings, bushfire or flood-affected land, or foreshore and environmentally sensitive areas — which covers plenty of Central Coast waterfront blocks.
Pool decks are their own thing
Any deck near a pool has to work with the pool barrier, not against it. Climbable surfaces, gate swings, non-climbable zones and fence heights all have to be maintained. We design pool-side decks around compliance from the first sketch, because retrofitting a fix is expensive.
What we handle
- Advising early which path your deck is likely to fall under.
- Engineering and structural detailing for elevated decks.
- Building to the certified design so inspections pass first time.
- Coordinating with your certifier where a CDC is required.
Common questions
Can I build a low deck without approval in NSW?
- Often yes. Low-set decks that meet the exempt development criteria for height, area, setbacks and drainage can usually be built without a certificate, but the criteria must all be met — not just the height.
Does a pergola over the deck change the approval?
- Usually. Adding a roof changes the floor area and height calculations and commonly pushes the job into complying development territory.
Do I need an engineer for an elevated deck?
- For anything meaningfully off the ground, yes. Post sizes, bracing, footing design and balustrade fixing should be engineered rather than guessed.