Tiler work should last for years, but small mistakes can show up quickly if the substrate, waterproofing, or grout isn’t right. In New Zealand homes, common problems often appear after bathrooms, kitchens, laundries, balconies, or outdoor areas have been tiled, especially where moisture, movement, and temperature changes are part of everyday life.
Spotting these issues early can save you from bigger repair bills, hidden water damage, and full re-tiling later on. Here’s what to look for, what the warning signs mean, and when it’s time to call a professional tiler.
Cracked or Loose Tiles
Cracked tiles are one of the most obvious signs something has gone wrong, but the cause is not always the tile itself. In many cases, the problem is movement in the floor or wall, poor adhesive coverage, or an uneven substrate underneath.
Warning signs to watch for
• Hairline cracks that appear in one tile or across a line of tiles
• Hollow-sounding tiles when tapped
• Tiles lifting at the corners or edges
• Grout cracking near the same area repeatedly
• Tiles that feel slightly springy underfoot
If cracks appear soon after installation, it may point to poor workmanship, insufficient curing time, or unsuitable materials. In older homes, movement from timber framing or subfloor flex can also lead to cracking, especially if the area was not properly prepared.
What to do
Small isolated cracks may be monitored, but if tiles are loose, lifting, or cracking in several places, get a tiler to inspect the area. Repair costs can vary widely depending on the cause, but in NZ you might expect:
• Minor tile replacement: about $150–$400 per visit
• Small repair jobs with regrouting or adhesive work: about $300–$800
• Larger re-tiling areas: often $120–$250+ per square metre, depending on material and prep
Grout Problems and Failing Joints
Grout is often treated as cosmetic, but it plays an important role in keeping water out and helping the tiled surface stay stable. When grout starts failing, it can be one of the first signs that the tile system is under stress.
Warning signs to watch for
• Crumbling or powdery grout
• Gaps opening between tiles
• Dark stains that keep returning after cleaning
• Grout lines that are cracking along the same route
• Silicone joints around showers, baths, sinks, or splashbacks peeling away
In wet areas, poor grout can allow moisture to reach the substrate. Around showers and bathrooms, failed silicone is especially important because it often signals movement or water ingress at joins and corners.
What to do
A bit of surface discolouration may be normal, but if grout is missing, soft, or cracking, don’t leave it. Regrouting and resealing are usually much cheaper than dealing with water damage later.
Indicative NZ price ranges:
• Regrouting a small bathroom: about $400–$1,200
• Resealing joints and wet-area silicone: about $150–$500
• More extensive grout restoration: about $20–$45 per square metre
Waterproofing Failures in Bathrooms and Wet Areas
Waterproofing is one of the most important parts of tiler work in NZ homes. A bathroom can look fine on the surface while water is slowly getting behind tiles, damaging plasterboard, framing, flooring, or adjacent rooms.
Warning signs to watch for
• Musty smells that persist even with ventilation
• Paint bubbling on nearby walls or ceilings
• Swelling in skirting boards, door jambs, or cabinets
• Stains appearing below a bathroom, shower, or balcony
• Mould around the edges of tiled areas or silicone joints
• Tiles that feel loose near showers, baths, or floor wastes
If the waterproofing membrane was installed poorly, damaged during tiling, or not turned up correctly at edges and penetrations, the symptoms may take months to appear. In NZ, this is especially important in homes with tiled showers, tiled laundries, or outdoor decks exposed to wind-driven rain.
What to do
Waterproofing issues should be treated as urgent. A licensed professional may need to inspect, test, and possibly remove tiles to check the membrane. Costs can range significantly:
• Small waterproofing repairs: about $500–$1,500
• Bathroom waterproofing remediation: about $1,500–$4,000+
• Full shower rebuilds: often $4,000–$10,000+ depending on scope and finishes
Poor Tile Layout and Uneven Finishes
Some tiling problems are not structural, but they still signal rushed or careless workmanship. Uneven joints, poor alignment, and visibly lippy tiles can affect both appearance and safety.
Warning signs to watch for
• Tiles that do not line up neatly across rows
• Uneven grout spacing
• Visible lippage, where one tile edge sits higher than the next
• Cut tiles in awkward places, such as narrow slivers at edges
• Patterns that don’t centre properly in the room
In bathrooms and kitchens, poor layout can be more than a cosmetic issue. Uneven surfaces can trap water, make cleaning harder, and increase the chance of chipped edges over time.
What to do
Minor layout issues may be accepted in older homes or very small spaces, but major unevenness is usually a workmanship problem. If the finish looks poor before the job is complete, raise it immediately rather than waiting until after grouting.
A professional may charge to correct or relay sections, and the cost depends on whether tiles need to be lifted, cleaned, and reinstalled. If the adhesive has already cured badly, repairs can become much more expensive than a good original installation.
Signs of Bad Substrate Preparation
A great tile finish depends on what sits underneath. If the wall or floor wasn’t prepared properly, the tiled surface may fail even if the tiles themselves are good quality.
Warning signs to watch for
• Hollow sounds across a large section of floor or wall
• Tiles cracking in a repeating pattern
• Uneven surfaces or visible dips in the floor
• Grout lines that open up after a few months
• Tiles lifting near joins, edges, or doorways
Substrate issues are common in older NZ homes where floors may not be level, timber may have movement, or previous repairs were done without enough preparation. In wet areas, inadequate fall to the drain can also leave puddling water, which is a warning sign that the base was not set up correctly.
What to do
If the tiles are failing due to substrate movement, the real fix may involve removing the tiled area and correcting the base. This is one of the more expensive tiler problems, but catching it early can stop the damage spreading.
When to Call a Professional Tiler
It is worth calling a professional as soon as you notice repeated cracking, soft spots, loose tiles, failed silicone, or any sign of water damage. If the issue is in a shower, bathroom, balcony, or other wet area, delay can make repairs far more costly.
Call a tiler urgently if you notice
• Water staining or mould near tiled areas
• Loose tiles in a shower or around a floor waste
• Persistent leaks or damp smells
• Cracks that keep returning after repair
• Tiles lifting across more than one area
A qualified tiler can inspect whether the problem is cosmetic, structural, or waterproofing-related. In some cases they may recommend a plumber, builder, or waterproofer as well, especially if the fault is not limited to the tiled surface.
For NZ homeowners, getting advice early is usually far cheaper than waiting until a small defect becomes a full bathroom renovation.
How to Reduce the Risk of Problems Later
The best way to avoid tiler problems is to choose the right installer and ask a few practical questions before work starts.
• Ask how the substrate will be prepared
• Confirm whether waterproofing is included and who is responsible for it
• Check what tile adhesive and grout products will be used
• Ask how long the area needs to cure before use
• Make sure the installer understands your room’s exposure to moisture, movement, or outdoor weather
A good tiler should also discuss expansion joints, drainage, and layout before starting. In NZ, that matters even more in coastal areas, colder regions, and homes with older building materials that may move over time.
If something doesn’t look right, trust your instincts. Early action can prevent tile failure, water damage, and much more expensive remediation later on.
Site Safe
SiteWise
BCITO Qualified
