Roofing contracts NZ: deposits, payments and variations explained

When is a written building contract mandatory?

MBIE says a written contract is mandatory when a homeowner contracts directly for residential building work costing $30,000 or more including GST. At that threshold, or if the homeowner asks, the contractor must also provide the prescribed consumer checklist and disclosure statement before signing. Sources: Building Performance; Building Performance.

What should a roofing contract actually say?

• Who the contracting parties are and the project address.
• Expected start/completion dates and how delays are handled.
• Price or the method used to calculate it.
• The roofing work, products/materials and known inclusions.
• Who handles any required consents or approvals.
• Who carries out and supervises the work.
• Payment stages and invoice process.
• How defects are remedied.
• How disputes are handled.
• How variations are agreed before changed work continues.

These are not RoofHub-invented clauses: they reflect the minimum-content themes in MBIE residential building-contract guidance. A particular project may need legal advice or additional terms. Sources: Building Performance.

How much deposit should you pay a roofer?

Consumer Protection states there is no legal requirement to pay a deposit merely because you accept a quote. If a deposit is requested, its published consumer guidance says not to pay more than 10% of the total cost. The rest of the payment structure should still make sense against materials supplied and work completed. Sources: Consumer Protection.

A project may have legitimate reasons for staged payments or material commitments. The important point is to put the payment schedule in the contract and understand what each payment corresponds to rather than paying an unexplained large amount in advance. Sources: Building Performance; Building Performance.

Can a roofing quote change?

What should progress payments be tied to?

MBIE guidance says contracts should describe the payment process and can set out the number, amount and due date of payments. If the contract does not provide a payment schedule, statutory default provisions may apply. Sources: Building Performance; Building Performance.

• Match stages to identifiable work or supplied materials.
• Keep invoices and payment records.
• Do not assume the final payment means warranty or completion documents no longer matter.
• If there is a payment dispute, follow the contract and Construction Contracts Act process rather than improvising.

Before signing a roofing contract

• Compare the final written scope against the quote you accepted.
• Check product/profile/coating and major flashings rather than only a brand name.
• Confirm removal, scaffold/access, underlay, disposal, drainage and known repairs.
• Read the payment and variation clauses.
• Check who is responsible for consent and LBP documentation if relevant.
• Save the disclosure statement, contract and any later written variations.

Related questions

Sources and review notes

Prepared by RoofHub editorial. Reviewed 21 October 2026. A source check confirms what a page states, not an independent inspection or invoice audit. Published project accounts are attributed to their publishers.

1. primaryBuilding Performance: Contracts for your building project (2026-01-15) - Building Performance guidance last updated 15 January 2026. Residential building work costing $30,000 or more including GST requires a written contract; disclosure and checklist requirements also apply at that threshold or when requested. Page checked 2026-10-21. Publication date shown above. · government
2. primaryBuilding Performance: Why contracts are valuable (2026-05-14) - MBIE guidance last updated 14 May 2026. A written contract is mandatory for residential building work costing $30,000 or more including GST; written contracts are recommended below that threshold too. Page checked 2026-10-21. Publication date shown above. · government
3. primaryConsumer Protection: Quotes and estimates - NZ government consumer guidance reviewed 21 October 2026. Distinguishes quotes from estimates, says accepted fixed quotes can only change where a variation is agreed, and states there is no legal requirement to pay a deposit; if one is requested, its consumer guidance says not to pay more than 10% of total cost. Page checked 2026-10-21. Publication date not stated. · government
4. primaryBuilding Performance: Protection for homeowners - Homeowner consumer-protection guidance covering the $30,000 including GST contract threshold, disclosure/checklist requirements and documents that contractors must supply when work is completed. Page checked 2026-10-21. Publication date not stated. · government
5. primaryCommerce Commission: Quotes, estimates and invoicing - NZ Commerce Commission guidance reviewed 20 October 2026. Defines quotes and estimates, requires agreement for extra work outside an accepted quote, and states quotes or estimates should be inclusive of GST. Page checked 2026-10-20. Publication date not stated. · government
6. primaryBuilding Performance: Implied contract terms - MBIE guidance on default residential building contract terms, including payments, variations, consents, subcontractors and disputes where a contract is missing required provisions. Page checked 2026-10-21. Publication date not stated. · government

Original calculations are labelled as examples. Historical prices stay dated, missing fields stay unknown, and conflicting specifications are flagged. Sources are not endorsements or paid rankings. Read our methodology or report a correction.

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