Replacing a single broken tile is a satisfying DIY job — but rushing it is the fastest way to crack the tiles next to it. With the right tools, a bit of patience, and the correct materials, most homeowners can tackle this repair in a weekend without disturbing the surrounding tiles.
What You'll Need
Before you start, gather your materials. Having everything on hand avoids stopping mid-job.
- Angle grinder or oscillating multi-tool with a grout removal blade
- Cold chisel and hammer (or a rotary hammer on a low setting)
- Safety glasses, gloves, and a dust mask — tile dust contains silica, which is a serious health hazard. Check WorkSafe NZ for guidance on working safely with silica dust.
- Replacement tile — ideally from your original batch (check the garage or under the house for spares)
- Tile adhesive — a polymer-modified adhesive such as those in the Ardex or Mapei ranges is a good choice for most NZ conditions
- Grout — matched as closely as possible to the existing colour
- Grout float, sponge, and bucket
- Tile spacers
- Notched trowel
Step 1 — Remove the Grout First
This is the most important step for protecting surrounding tiles. Never start chiselling a broken tile without removing the grout joints around it first.
Use an oscillating multi-tool or a manual grout rake to carefully remove grout from all four sides of the broken tile. Work slowly and keep the tool angled away from adjacent tiles. Remove grout to a depth of at least 5–6 mm so the tile edge is fully free.
Step 2 — Break Out the Damaged Tile
Once the grout is cleared, score an X across the broken tile with your angle grinder (if it isn't already cracked through). Then, using a cold chisel and hammer, start from the centre and work outward in small pieces. Never lever against the edges of surrounding tiles — this is how you crack them.
Work at a low angle and tap gently. If the tile is particularly stubborn, a rotary hammer on its lowest setting can help, but use it with care.
Step 3 — Clean Up the Substrate
Chip away all the old adhesive from the substrate (the surface underneath) until you have a clean, flat base. Any high spots left behind will cause your new tile to sit proud of the surrounding tiles or rock when walked on.
Check that the substrate is sound — if it's a wet area like a shower or bathroom, look for any signs of water damage, soft spots, or mould behind the tile. NZ Building Code clause E3 (Internal Moisture) requires wet areas to be properly waterproofed. If the substrate looks damaged or wet, stop and investigate further before re-tiling.
Step 4 — Dry-Fit the Replacement Tile
Before applying any adhesive, place the new tile in the gap and check the fit. It should sit flush with the surrounding tiles with an even gap on all sides for grout. If the tile is slightly too large, a tile wet saw or angle grinder with a diamond blade can trim it down.
Step 5 — Bed the New Tile
Apply tile adhesive to the substrate using a notched trowel, then back-butter the tile itself (apply a thin layer to the back of the tile too). This is especially important for larger format tiles and in wet areas, ensuring full coverage and a watertight bond.
Press the tile firmly into place with a slight twisting motion, then use tile spacers to maintain even grout joints. Check it's level with the surrounding tiles using a straightedge. Allow the adhesive to cure fully — check the manufacturer's instructions, but typically 24 hours minimum before grouting.
Step 6 — Regrout and Finish
Mix your grout according to the packet instructions and apply it with a grout float, pressing it firmly into the joints. Wipe away excess with a damp sponge before it sets. Buff the tile clean once the grout has hazed over.
For wet areas, use a waterproof or epoxy grout and ensure the perimeter joints (where tile meets bath, shower tray, or wall) are sealed with a flexible silicone sealant rather than grout — this allows for movement and prevents cracking.
Matching Your Grout Colour
Grout colour matching is notoriously tricky, especially on older tiles where the existing grout has discoloured over time. Take a photo of your existing grout to your local Mitre 10 or Bunnings and compare it against grout colour charts. You may need to mix two shades or accept a slight variation. Cleaning the surrounding grout before comparing can help get a truer colour match.
Tips for Wet Areas and NZ Conditions
NZ's variable climate — particularly in humid regions like Auckland or the West Coast — means moisture management is critical. If you're retiling in a shower or around a bath, check that the waterproof membrane behind the tiles is intact. BRANZ has good guidance on wet area construction standards. If you're unsure, consult a tiler.
For rental properties, note that Tenancy Services Healthy Homes standards require bathrooms to be in good repair — a broken tile in a wet area should be fixed promptly.
When to Call a Professional
Call a qualified tiler or handyman if:
- Multiple tiles are cracked — this can indicate movement in the substrate or a structural issue
- The substrate is damaged or wet — waterproofing repairs in wet areas may require a licensed professional and could need a building consent depending on scope (check with your local council)
- You can't source a matching tile — a professional may have trade contacts or be able to source discontinued tiles
- The tile is in a high-traffic or structural area — such as a tiled floor with underfloor heating
You can find experienced local tilers and handymen on tradedirectory.co.nz.
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