Ask three different bathroom renovators what a 'standard family bathroom' costs and you'll get three answers between $14,000 and $80,000. Both ends are technically correct — they're describing different jobs. The reason quotes feel impossible to compare is that nobody on the customer side is using the same words for scope. So before any number is meaningful, the scope has to be named.
§01Three scopes, three price worlds
Roughly, every NZ bathroom renovation falls into one of three buckets. A refresh keeps the layout, the tiles, and the waterproofing — paint, vanity, tapware, toilet, accessories all change. A mid-scope retile takes the tiles and shower off, redoes the membrane and surfaces, but leaves the plumbing rough-in alone. A full reno opens walls, moves plumbing, and changes the layout. Pricing scales roughly 1× / 2.5× / 5× across those tiers for the same room.
§032026 medians, by size and scope
These are nationwide-median figures for a single bathroom in a standard residential context — not a heritage villa with asbestos issues, not an off-grid alpine cabin. Apply your regional multiplier on top.
- Small bathroom refresh: NZ$4,500–9,000
- Small mid-scope retile: NZ$12,000–22,000
- Small full reno: NZ$28,000–48,000
- Medium bathroom refresh: NZ$6,500–13,000
- Medium mid-scope retile: NZ$18,000–32,000
- Medium full reno: NZ$38,000–68,000
- Large bathroom refresh: NZ$9,500–18,000
- Large mid-scope retile: NZ$26,000–46,000
- Large full reno: NZ$55,000–105,000
§07Regional cost multipliers
Auckland sits roughly 18% above national median, Queenstown 30%+ above, Wellington 8% above, the Bay 5% above. Christchurch is 6% below median, Dunedin 10% below, Hamilton and Napier near median. Smaller centres usually save you 5–15% on labour but cost you on freight for tile and tapware.
§09Where the money actually goes
On a $30,000 mid-scope retile, expect roughly $9–11k labour, $4–5k tiles & sundries, $3–5k tapware/shower/screen, $2–3k vanity & basin, $1–2k toilet, $1–2k waterproofing materials and BRANZ certification, $2–3k plumbing labour separately, plus 8–12% in builder margin and overheads. The line items most often skimped on are the membrane and the tiler's time — those are the lines worth protecting.
§11Variation buffer
Build a 10–15% buffer into your budget regardless of scope. Pre-1990 villas almost always reveal something behind the wall — rotten dwangs, asbestos vinyl, undersized waste pipes, no clearance for modern tapware. A good builder will flag risk in the quote; an honest builder will sometimes still find more once the wall is open.