Can I Replace a Broken Concrete Roof Tile Myself Safely?

Replacing a single broken concrete roof tile is something a capable DIYer can tackle, but it must be done safely. Working at height is one of the leading causes of serious injury in New Zealand, so before you climb a ladder, you need to understand the risks, the legal requirements, and exactly what the job involves. If you have any doubts about your fitness, your roof's pitch, or your access, call a qualified roofer — you can find local professionals on tradedirectory.co.nz.

Is It Legal for a Homeowner to Do This Work?

Replacing a concrete roof tile is not restricted building work under the NZ Building Code, so you don't need a Licensed Building Practitioner (LBP) to do it. It also generally falls under Schedule 1 exemptions, meaning a building consent is unlikely to be required for a like-for-like tile replacement. That said, always confirm with your local council before starting, as exemptions can depend on your specific situation. You can learn more about consent requirements at MBIE Building Performance.

Note: if your roof has electrical wiring, solar panels, or skylights near the damaged area, do not proceed without consulting a licensed electrician registered with the Electrical Workers Registration Board (EWRB). Electrical work is restricted and must never be attempted by an unlicensed person.

Height Safety — Your Most Important Consideration

Under WorkSafe NZ guidelines, any work at height carries serious risk. Before going on your roof:

• Only work on a dry, calm day — wet or windy conditions make roof surfaces dangerously slippery.
• Use a roof ladder (a ladder with a ridge hook) to spread your weight and avoid cracking surrounding tiles.
• Wear non-slip footwear with rubber soles.
• Have a second person on the ground to stabilise your ladder and assist in an emergency.
• Consider hiring or buying a safety harness and anchor system if your roof pitch is steep (generally over 25°).
• Never work alone on a roof.

If your roof is particularly steep, high, or difficult to access, this is a job best left to a professional roofer.

Tools and Materials You'll Need

• Replacement concrete tile (matching profile and colour — see below)
• Roof ladder or ladder standoff
• Flat pry bar or tile lifter
• Hammer
• Roofing nails or clips (as appropriate)
• Safety harness and anchor (recommended for steeper pitches)
• Gloves and safety glasses

Finding a Matching Replacement Tile

This is often the trickiest part. Concrete tiles come in many profiles — flat, low-profile, and high-profile — and colours fade over time, so a new tile may not match perfectly. Check:

• The manufacturer's name or profile number moulded into the underside of an existing tile.
• Common NZ brands include Monier and Bristile (now part of Boral). Your local roofing supplier or PlaceMakers may be able to help identify and source a match.
• If an exact match isn't available, consider swapping a tile from a less visible area of the roof (such as a rear slope) and placing the new tile there instead.

Step-by-Step: Replacing the Tile

1. Access the Roof Safely

Set up your ladder on firm, level ground. Attach your roof ladder at the ridge. Wear your harness if required.

2. Lift the Surrounding Tiles

Concrete tiles interlock with their neighbours. Use a flat pry bar to gently lift the tiles directly above and to the sides of the broken one. Slide timber wedges or folded rags underneath to hold them up while you work.

3. Remove the Broken Tile

Slide the broken tile downward and out. If it's nailed or clipped, carefully remove the fixing first. Take the broken pieces off the roof — don't let them slide into the gutters or fall to the ground below.

4. Check the Underlayment

With the tile removed, inspect the roofing underlay (sarking felt or breathable membrane) beneath. If it's torn, cracked, or deteriorated, this is a sign of a larger issue — consider calling a roofer to assess the full roof condition. A compromised underlay can allow water ingress and may affect compliance with NZ Building Code clause E2 (External Moisture).

5. Fit the New Tile

Slide the new tile into position, engaging the interlocking nibs on the batten. Nail or clip it as required by the original fixing method. Lower the surrounding tiles back into place and check they're properly seated.

6. Inspect Your Work

From the ground (or carefully from the roof), check that all tiles are flush, correctly overlapping, and that no gaps are visible. If possible, check from inside the roof space after the next rainfall to confirm there's no water ingress.

When to Call a Professional

Call a qualified roofer if:

• Multiple tiles are broken or slipping — this may indicate a systemic problem with fixings or the batten structure.
• The underlay is damaged or you can see daylight through the roof from inside.
• Your roof is steep, high, or difficult to access safely.
• You're unsure about matching the tile profile or fixing method.
• There is any moss, lichen, or widespread deterioration — the whole roof may need assessment.
• The property is a rental — landlords have obligations under the Healthy Homes Standards to maintain weathertight roofs.

A licensed roofer can also advise whether your roof is nearing end-of-life and whether repair or full replacement is more cost-effective. Find trusted local roofers on tradedirectory.co.nz.

Sources & Further Reading

• WorkSafe NZ — Working at Height
• MBIE Building Performance — Building Consent Exemptions
• BRANZ — Roof Maintenance Guidance
• Licensed Building Practitioners
• PlaceMakers — Roofing Supplies
• Tenancy Services — Healthy Homes Standards