Tile Calculator

For a typical NZ bathroom of 5–7 m² (3m × 2m floor), you will need around 70–80 standard 300×300mm tiles (including wastage), or about 16–20 large-format 600×600mm tiles. For walls, calculate the wall area separately (length × height) and subtract the doors and windows. Always add 10–15% wastage — more for diagonal layouts or herringbone patterns. Source: Tile Warehouse NZ.

Standard advice is 10% wastage for straight (square) tile layouts, 15% for diagonal layouts, and 20% for complex patterns like herringbone or chevron. Add an extra 5% if tiles are large format (600×1200mm or bigger), as cuts produce larger waste pieces. Always buy from the same dye lot — ordering more tiles later may give a slightly different colour. Source: NZ tile retailers.

Tile installation in NZ costs roughly $40–$80 per square metre for standard ceramic floor tiles, $60–$100 per m² for wall tiles, and $90–$150 per m² for large-format porcelain or natural stone. Add for substrate prep, waterproofing (essential in wet areas, ~$30–$50/m²), and grout sealing. A typical 7 m² bathroom retile costs $1,200–$2,500 for labour plus $300–$1,500 for tiles depending on quality. Source: NZ tradesman quotes 2026.

Depends on where you buy. Retail tile suppliers (Bunnings, Mitre 10, Placemakers, Tile Warehouse) display GST-inclusive prices. Trade outlets and direct importers (Tile Space, Tile Depot trade counters) typically quote GST-exclusive — you add 15% at checkout. Always ask 'is that GST-inclusive?' before signing a quote. For renovations, tradies charge GST on installation labour (15%). If you're a GST-registered landlord renovating a rental, you can claim back GST on tiles + installation. If renovating your own home, you cannot. Imported tiles from China/Italy (via places like Trade Tested) include GST + 15% Customs duty on imports >$1,000. Source: IRD GST guide.