Roof Repair Cost NZ 2026 — How Much for Leaks, Tiles & Iron
Roof repair costs in NZ 2026 — typical prices for leak repairs, tile replacement, flashing repairs, and moss treatment. When to repair vs reroof, and how to get a fair quote.
Most roof problems don't need a full reroof — targeted repairs at $300–$2,500 fix the majority of leaks and issues homeowners encounter. The key is getting a licensed roofer to diagnose the problem correctly so you're fixing the right thing.
Roof Repair Costs NZ 2026
| Repair Type | Typical Cost (incl. GST) |
|---|---|
| Inspection and report | $200–$500 |
| Single tile replacement | $120–$300 |
| Multiple tile replacement (10–20 tiles) | $500–$1,500 |
| Tile re-bedding and pointing | $600–$2,500 |
| Flashing repair (valley, hip, penetration) | $300–$1,200 |
| Ridgecapping reseal | $400–$1,500 |
| Leak investigation and localised repair | $350–$2,000 |
| Moss and lichen treatment | $300–$900 |
| Roof wash (waterblasting) | $350–$850 |
| Spouting repair / gutter clean | $200–$600 |
| Skylight leak repair | $400–$1,800 |
| Iron roof re-screw and reseal | $800–$3,500 |
Most Common Roof Repairs
Leaking Roof
The most common call-out. Causes include: cracked or displaced tiles, failed valley flashings, corroded screws on iron roofing, failed ridgecapping, and blocked spouting causing overflow into the soffit.
Diagnosing leaks is harder than fixing them — the entry point is often far from where water appears inside. A good roofer inspects from outside in the rain if possible, or uses a garden hose methodically to trace the path. Expect to pay $200–$500 for a proper diagnosis.
Flashing Failures
Flashings seal the junction between roofing and walls, chimneys, skylights, and penetrations. They're the most failure-prone component on any roof. A failed flashing can typically be repaired or replaced for $300–$1,200 — far cheaper than the water damage it causes if left unaddressed.
Tile Damage
After hail, fallen branches, or simply age, individual tiles crack or break. Replacement cost is low ($120–$300 per tile including labour) if done promptly. Left unattended, water entry causes batten rot and insulation damage that multiplies the repair cost significantly.
Iron Roof Screw Fatigue
Longrun iron is fixed with screws through the crest of the profile. Over 15–25 years, screws fatigue, corode, or their rubber washers perish — creating dozens of small entry points. A re-screw job ($800–$3,500 depending on roof size) replaces all screws and seals with new self-sealing screws.
Moss and Lichen
Moss and lichen hold moisture against the roof surface and accelerate deterioration. A biocide treatment ($300–$900) kills growth and should be repeated every 3–5 years in humid climates. Don't waterblast tiles — high pressure dislodges the protective granule coating on concrete tiles.
Repair vs Reroof — How to Decide
Repair when: - The roof is less than 20–25 years old and in good condition overall - Only one or two areas have problems - The roofing material is sound (not corroded through, not widespread cracking) - The repair cost is less than 30% of a full reroof
Reroof when: - Multiple leaks in different locations - Widespread tile cracking or iron rust-through - The roof is more than 35–40 years old - Repair cost exceeds 30–40% of a full reroof - You're planning a significant renovation and want a dry, guaranteed envelope
An honest roofer will tell you which is appropriate. Get two opinions if there's any doubt.
DIY Roof Repairs — What's Safe?
Safe for a competent homeowner: - Applying roof sealant around visible penetrations (skylights, pipes) as a temporary measure - Clearing blocked spouting and downpipes from a ladder at eave height - Applying moss treatment from a safe surface
Never DIY: - Walking on tile roofs (they crack under point loads) - Any work requiring scaffolding or on steep pitches - Flashing replacement or any work involving saw-cutting - Anything that requires being on the roof for more than a few minutes
Falls from roofs are one of NZ's leading causes of serious injury. Use a licensed roofer for any work beyond ground-level spouting cleaning.