Deck approval checker (NSW)
Exempt, CDC or DA?
Answer a few questions about your deck and block to see which NSW approval pathway it most likely needs: exempt development (no approval), a CDC or a DA.
Open calculator →Calculators
Decking calculators
Quick, visual tools for planning a deck: board layout, stairs and materials. Handy for a sense-check; your quote is still free and specific.
Deck set-out & board layout
Board count, cut list & spacing
Work out board count, the ripped last-board width, total decking and indicative joist/bearer spacing from your deck dimensions.
Open calculator →Stair builder
Risers, going & comfort checks
From total rise and available run, get riser count, riser height and going, checked against comfortable, compliant ranges.
Open calculator →Material quantity estimator
Boards, framing, fixings & oil
Estimate decking, joists, bearers, posts, screws and oil/stain from your deck area and substructure spacing.
Open calculator →⚠️ These tools use sensible placeholder formulas and assumptions while we confirm the real standards (including AS 1684 for spans and AS 1657 for stairs). Treat the results as a starting point, not gospel. TBC.
Thinking about a new deck, or rescuing an old one?
Tell us about your place. We’ll come out, take a look, and give you a straight answer.