🚿 Bathroom Renovation Planning NZ (2026)
A full bathroom renovation is one of the most complex small projects in a house — it involves a builder, plumber, electrician, waterproofer, tiler, GIBber, and painter, all in a tight sequence. Here's the complete planning guide for NZ homeowners.
Decisions to Make BEFORE Demo Day
The most expensive bathroom renovation mistakes happen when homeowners start demo before making all their design decisions. If you change your mind after rough-in, you're paying to redo it.
- Layout confirmed — are any walls or drains moving? (triggers building consent)
- Floor and wall tiles selected and ordered (tile lead times 2–6 weeks from some suppliers)
- Shower type confirmed — nib wall, frameless glass, framed? (affects waterproofing area)
- Tapware and shower mixer selected (plumber needs specs for rough-in heights and valve type)
- Vanity and basin selected (affects waste and supply rough-in height)
- Toilet suite selected (affects rough-in distance)
- Underfloor heating? (goes under tiles — must be decided before tiling)
- Heated towel rail position confirmed (electrician needs to know)
- Exhaust fan location (electrician)
- All trades booked with confirmed start dates
Week-by-Week Timeline (Standard 6-Week Reno)
Preparation & Booking
Book all trades. Order tiles (check lead times — Italian tiles can be 6–8 weeks). Finalise all product selections. Apply for building consent if needed.
Demo & Strip Out
Remove vanity, toilet, bath/shower, tiles, linings. Hire a skip. Isolate water to bathroom. Test for asbestos if pre-1990 build.
Structural Work (if needed)
New walls, relocate doorways, patch floor if drains are moving. If no structural changes, skip to rough-in immediately.
Plumbing & Electrical Rough-In
Plumber relocates/installs waste and supply pipes. Electrician runs cables for lights, fan, heated towel rail, underfloor heating. Both must be done before walls are lined. Council inspection may be required.
Waterproofing
Membrane applied to shower base, walls, and floor. Must be inspected and signed off before tiling. Book the council inspection immediately after application — waiting for an inspector slot can add days.
GIBbing (Wet Area Board)
Villaboard or fibre-cement sheets for wet areas; standard GIB for dry walls. Stopping and drying time adds 3–5 days. GIBber cannot start until rough-in is complete.
Tiling
Floor and wall tiles after waterproofing sign-off and GIB. Underfloor heating mat goes down before floor tile adhesive. Grout after tiles are set (24–48 hours).
Painting
Ceiling and any non-tiled walls after GIB is fully stopped and sanded. Use a moisture-resistant paint (Dulux Aquanamel or similar).
Second-Fix Plumbing
Plumber returns: sets vanity, fits taps and mixer, installs toilet, connects shower. Issues Certificate of Compliance.
Second-Fix Electrical
Electrician fits light fittings, exhaust fan, switches, heated towel rail. Issues Certificate of Compliance.
Accessories & Finishing
Mirror, toilet roll holder, towel bars, shower screen. Touch-up painting. Shower silicone bead. Final clean.
Budget Guide — NZ Bathroom Renovation 2026
| Item | Budget | Mid-range | High-end |
|---|---|---|---|
| Demo & skip hire | $500–$1,000 | $800–$1,500 | $1,000–$2,000 |
| Plumber (rough-in + fit-off) | $2,000–$3,500 | $3,500–$6,000 | $5,000–$10,000 |
| Electrician | $800–$1,500 | $1,200–$2,500 | $2,000–$4,000 |
| Waterproofing | $600–$1,000 | $800–$1,500 | $1,000–$2,000 |
| GIBbing & stopping | $800–$1,500 | $1,200–$2,500 | $1,500–$3,000 |
| Tiling (labour) | $1,500–$3,000 | $2,500–$5,000 | $4,000–$8,000 |
| Tiles (materials) | $800–$2,000 | $2,000–$5,000 | $5,000–$15,000 |
| Tapware & mixer | $500–$1,000 | $1,000–$3,000 | $3,000–$8,000 |
| Vanity + basin | $500–$1,500 | $1,500–$4,000 | $4,000–$12,000 |
| Toilet suite | $400–$700 | $700–$1,500 | $1,500–$4,000 |
| Painting | $500–$800 | $700–$1,200 | $800–$1,500 |
| Shower screen/glass | $600–$1,200 | $1,200–$3,000 | $3,000–$7,000 |
| Total (incl. GST) | $8,000–$15,000 | $18,000–$38,000 | $35,000–$80,000+ |
Add 15–20% contingency for hidden damage (rotten framing, old drainage, asbestos). These are very common in NZ homes built before 1985.
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Get Quotes Free →Frequently Asked Questions
Do I need a building consent for a bathroom renovation in NZ?
Not always. If you're replacing like-for-like with no structural changes and no drain relocations, a building consent is generally not required. However, waterproofing may still need a council inspection in some jurisdictions, and plumbing always needs a licensed plumber who issues a Certificate of Compliance. Moving walls or drains triggers a consent requirement. When in doubt, call your local council duty planner — it's free advice.
What is the most expensive part of a bathroom renovation?
Usually tiling (materials + labour combined) or plumbing, depending on the complexity. High-end tapware and vanities can also add significantly to the budget. The least predictable cost is what's discovered after demo — leaking pipes, rotten framing, or mould in the walls can add $2,000–$10,000 to a project. Always allow a 15% contingency.
Can I live in the house during a bathroom renovation?
Usually yes if you have a second toilet in the house. The bathroom is typically out of action for 4–5 weeks in a full reno. Many homeowners arrange to use neighbours' or family showers during the tiling and fit-off stages. In a one-bathroom home, consider timing the project for when you can stay elsewhere for 1–2 weeks during the worst period.
Should I get a builder to manage the whole bathroom renovation?
If this is your first renovation, yes — a builder project manager typically adds 15–25% to the labour cost but handles the scheduling, trade coordination, and code compliance paperwork. Self-managing is viable if you've done it before and can stay on top of the booking sequence. A one-week mistake in trade sequencing can cost more than the PM fee.