What is a Certificate of Acceptance - and When Do You Need One in New Zealand?

You're selling your home, and the buyer's lawyer has flagged a problem: the bathroom renovation done eight years ago doesn't appear anywhere on the council property file. Or you're the buyer with pre-approved finance, a finance condition in your offer and the bank won't release full lending because the sleepout in the backyard was never consented.

This is one of the most common ways a property deal stalls in New Zealand, and it has a specific remedy: the certificate of acceptance.

At CA Architecture, we help Christchurch, Auckland and New Zealand property owners through this process regularly. Here's what you need to know.

What is a certificate of acceptance?

A certificate of acceptance (often shortened to CoA) is a formal document issued by your local council under the Building Act 2004. It states that the council has reasonable grounds to believe that specific building work complies with the Building Code even though that work was carried out without a building consent.

Think of it as retrospective recognition. It's not the same as a building consent, and it's not a code compliance certificate (CCC). It's the council saying, after the fact: we’ve looked at this work, and we’re satisfied it meets the standard it needed to meet.

One important limitation to understand from the outset: a council can only certify what it can actually see and verify. If the framing, insulation, or waterproofing is hidden behind finished walls, the certificate will typically be issued with qualifications noting what couldn't be inspected. That's normal, but it's also why the supporting documentation you provide matters so much.

When do you need a certificate of acceptance?

The most common situations we see in Christchurch:

You're selling a property with unconsented work. Renovations, extensions, garage conversions, added bathrooms, removed walls, if the work needed a consent and never got one, it will surface in the buyer's due diligence. A LIM report and the council property file won't match what's physically there.

You're buying, and your lender has raised it. Banks are increasingly cautious about lending against properties with unconsented work. Pre-approved buyers with a finance condition often can't get full lending approval until the work is regularised or documented with as-built drawings.

You've inherited the problem. Many owners discover unconsented work done by a previous owner sometimes decades ago only when they come to sell, insure, or renovate.

Work was done urgently. The Building Act also recognises situations where work had to be carried out immediately for safety reasons, with no time to obtain a consent first.

Your insurer has asked questions. Unconsented work can complicate or limit insurance cover, particularly for weathertightness and structural matters.

What about work done before 1992?

The certificate of acceptance pathway applies to building work carried out after the Building Act 1991 came into force (1 July 1992). For unconsented work older than that, the usual route is a safe and sanitary report prepared by a suitably qualified professional and lodged with the council. If you're not sure which side of the line your work falls on, that's one of the first things we'll establish for you.

How does the application process work in Christchurch?

For properties in Christchurch, applications go to Christchurch City Council. The process in broad strokes:

1. Document what exists. The council needs a clear picture of the work as built. This is where architectural input is usually essential accurate, measured as-built drawings of the unconsented work are the backbone of a strong application.

2. Commission a compliance report. The council requires a report assessing all of the building work against the relevant Building Code clauses. This needs to come from a suitably qualified and experienced person who understands the Building Code and building inspection typically an architectural professional, a building surveyor, or in some cases an engineer.

3. Gather supporting evidence. Statements from the people who did the work, photographs taken during construction, invoices, and product documentation all strengthen the application.

4. Lodge the application. Christchurch City Council accepts applications through its Online Services portal, which reduces processing time and avoids scanning fees. Once received, the statutory clock of 20 working days starts though the council can pause it to request further information, which is where incomplete applications get bogged down.

5. Council assessment and inspection. Council officers will assess the documentation and inspect what can be inspected before making a decision.

If the council declines, you can apply to the Ministry of Business, Innovation and Employment (MBIE) for a determination, an independent review of the decision.

What does a certificate of acceptance cost?

There's no single fixed price, and it's worth understanding why. The fees typically include:

- A minimum service fee (treated as a deposit)
- The fees, charges and levies that would have applied if a building consent had been obtained before the work was done, the Building Act expressly allows the council to recover these
- The council's actual processing costs, invoiced before the certificate is issued
- Your professional costs for as-built architectural drawings, potential structural engineering drawings and the submission that demonstrates the renovation work complies with the Building Act.

In practice, a certificate of acceptance usually costs more than a building consent for the same work would have. That's by design, it's not intended to be a cheaper alternative to consenting properly. But when the alternative is a stalled sale, reduced lending, or an uninsurable improvement, it's almost always worth resolving.

Will it affect my property file and LIM?

Yes and transparently is better. The application and the council's decision will appear on your LIM, and the full documentation becomes part of the property file available to future purchasers. A property file that shows unconsented work properly resolved tells a far better story to buyers, lawyers, and lenders than a story with an house of alterations without documentation.

How CA Architecture can help

We're a Christchurch architectural design studio, and unconsented work is something we deal with often, usually for owners of renovated homes where no drawings or detailing were ever prepared.

Our role in a certificate of acceptance application typically covers:

- Measured as-built drawings of the unconsented work, prepared to council standards
- Building Code assessment documentation to support the compliance report
- Liaison with your City Council through the application, including responding to requests for further information
- Advice on the right pathway in some cases, smaller work may qualify for a building consent exemption instead, which is a simpler and cheaper route. We'll tell you honestly which one fits your situation.

If you're partway through a sale and time matters, tell us we understand the pressure of finance conditions and settlement dates, and we structure the work accordingly.

Frequently asked questions

Is a certificate of acceptance the same as a code compliance certificate?
No. A code compliance certificate (CCC) is issued when consented work is completed and verified against the building consent. A certificate of acceptance is for work that was done without a consent. A CoA also carries qualifications the council only certifies what it could reasonably verify.

Can I get a certificate of acceptance for work done before 1992?
No for pre-1992 unconsented work, the usual pathway is a safe and sanitary report lodged with the council.

How long does it take?
The statutory processing timeframe is 20 working days from the working day after the council receives the application, but the clock pauses whenever the council requests further information. Well-prepared applications with complete as-built drawings and a thorough compliance report move significantly faster.

Will the council make me undo the work?
If the work doesn't comply with the Building Code, the council can issue a notice to fix requiring remediation. This is another reason to have the work professionally assessed before lodging so you know what you're dealing with and can address issues on your own terms.

Do I really need an architectural designer for this?
The council requires the compliance report to come from someone suitably qualified and experienced with the Building Code, and in practice, applications without professional as-built drawings are far more likely to stall on requests for further information. Most owners find the professional fees are small against the cost of a delayed or collapsed sale.

Does CA Architecture handle properties outside Christchurch?
Yes, we work across Canterbury, including Selwyn and Waimakariri districts, and have completed projects throughout the South Island and in Auckland, Waikato and Bay of Plenty.

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Not sure which pathway your property needs?

If you've discovered unconsented work, or you suspect a renovation was never signed off, the first step is simply understanding what you're dealing with. Get in touch with Casey and Tk for an honest assessment of your situation and the most cost-effective route to resolving it.



Planning a renovation and want to get it right from the start? Our Floor Plan Reviewis a low-commitment way to test your ideas with an architectural designer before you commit to a full design process.

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CA Architecture is a Christchurch architectural design studio affiliated with Architectural Designers New Zealand (ADNZ). We design residential, commercial and community spaces across Canterbury and New Zealand, and provide certificate of acceptance, building consent exemption, and as-built documentation services.