Bathroom Renovation
Calculator

This is an ORWES planning model reviewed in November 2026. It uses fixed illustrative allowances, not live market quotes or prices from your cart. Length × width gives floor area; twice (length + width) × height gives wall area.

Base construction allowances per m² of floor: $1,420–$1,440 for core trades and materials, plus $120 for waterproofing. Tiling and tiles add $118–$128 per m² of floor and walls. Clean-up adds $40 per m² of floor. The full-renovation base includes demolition, carpentry, plumbing, electrical, plastering, painting, a shower screen and niche, even if no shower fixture is selected.

Construction and clean-up factors: NSW 1.00×; ACT 1.15×; VIC 1.05×; QLD 1.10×; SA 1.08×; WA 1.18×; TAS 1.17×; NT 1.35×. Fixture allowances do not change by state. Add 20% builder margin and 5% contingency to the combined subtotal; these percentages are assumptions you should review with your builder.

Excluded: structural alterations, asbestos or other hazardous materials, approvals, major service relocation, remote-access charges, delivery and unselected fixtures. The model does not add a separate GST amount; request an itemised, tax-inclusive quotation before committing. It is not designed for a cosmetic refresh, powder room or new extension.