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.

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 →

⚠️ 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.