Do You Need Building Consent for Roofing Work in NZ?
When building consent is required for roofing and re-roofing in New Zealand. Covers like-for-like exemptions, material changes, and LBP requirements.
Roofing work in New Zealand is regulated because the roof is a critical part of the building envelope — it keeps water out and protects the structure. Whether you need consent depends on the type and extent of the work being done.
When Consent Is Not Required
Under Schedule 1, you generally do not need consent for: repairing existing roofing (replacing damaged sheets, tiles, or flashings with the same material), routine maintenance (clearing gutters, resealing flashings, treating moss), and in some cases, a like-for-like re-roof where you replace the entire roof with the same material type in the same configuration without structural changes.
When Consent Is Required
Building consent is required when: you change the roofing material type (e.g., tiles to long-run steel), you alter the roof structure (adding skylights, changing pitch, increasing span), you add insulation that changes the roof space ventilation, or you are doing a re-roof as part of a larger building project that requires consent. Changing material type affects the structural loading and weathertightness performance, both of which need to be assessed.
Re-Roofing as Restricted Building Work
Re-roofing is classified as restricted building work because it affects the weathertightness of the building. Even when a like-for-like re-roof may be exempt from consent, the work itself must be carried out or supervised by a Licensed Building Practitioner (LBP). The LBP must provide a Record of Work. This requirement applies regardless of whether a building consent is needed.
Underlay and Ventilation Requirements
The NZ Building Code (E2/AS1) sets requirements for roof underlay and ventilation. Modern re-roofing projects should install building underlay to current standards and ensure adequate ventilation in the roof space to prevent condensation. If your existing roof has no underlay (common in older NZ homes), adding underlay during a re-roof is highly recommended even if not strictly required for consent-exempt work.
Asbestos Roofing
Many older NZ homes have asbestos cement roofing. Removing asbestos roofing requires a licensed asbestos removal contractor who follows strict safety procedures to prevent fibre release. The Health and Safety at Work (Asbestos) Regulations 2016 apply. Your roofer should identify asbestos before starting work and arrange appropriate removal. Asbestos disposal must go to an approved landfill.
Key Takeaways
- Roof repairs and like-for-like re-roofs may be exempt from consent
- Changing roofing material type or altering structure requires consent
- Re-roofing is restricted building work — an LBP is always required
- Underlay and ventilation should meet current NZ Building Code standards
- Asbestos removal requires a licensed asbestos removal contractor
Frequently Asked Questions
In many cases, yes — replacing your roof with the same material type in the same configuration without structural changes is exempt under Schedule 1. However, interpretations vary between councils. Some councils require consent for full re-roofs regardless. Check with your local council before starting work.