Renovation Defects NZ: What to Do When You Find a Problem With Building Work

If the renovation is still underway, raise the issue now

You do not need to wait until handover to raise a concern.

If you see something during construction that appears inconsistent with the current drawings, specification, agreed variation or expected workmanship, record it and raise it promptly with the appropriate contractor.

MBIE encourages contractors and homeowners to deal with quality problems as work progresses because later work can cover them and make repair more difficult.

If the issue involves a change from the agreed project rather than faulty work, use SeekSaver's Renovation Variations NZ process instead.

Do not jump straight from “problem” to “proven defect”

Start by writing down what you actually observed.

The first description is more useful. Record:

• location;
• date discovered;
• what you can actually see or observe;
• whether it appears to be changing;
• photographs or videos;
• relevant project documents.

That preserves facts before disagreement develops.

Work out what the issue should be compared against

MBIE provides a useful hierarchy for assessing whether building work is defective. Its guidance says the assessment should refer, in order, to:

1. the contract, drawings, specifications and relevant schedules;
2. the building consent and supporting documentation;
3. manufacturer's specifications and installation instructions;
4. any defect-tolerance schedule agreed in the contract;
5. relevant New Zealand Standards;
6. MBIE's workmanship/tolerance guidance.

For a renovation, also make sure you are using the current agreed project position. If an agreed variation changed a drawing, product or specification, compare the work with that updated position rather than an obsolete original document.

Be careful with generic workmanship tolerances

MBIE's Guide to tolerances, materials and workmanship is useful, but it is primarily targeted at new residential building work.

MBIE warns that acceptable workmanship in renovations may differ because renovation work combines existing construction with new work and may require more compromise. The guide is also not a mandatory universal quality standard.

Do not use one generic tolerance number to declare renovation work defective without considering the actual project requirements.

If the available documents do not answer the question, professional advice may be needed to determine whether an issue is defective and how it should be remedied.

Check the current agreed project position

Bring together the documents most relevant to the issue. Depending on the problem, these may include:

1. 1Current contract and agreed scope
2. 2Current drawings and specifications
3. 3Agreed variations
4. 4Consented documents where applicable
5. 5Manufacturer requirements
6. 6Agreed workmanship or tolerance requirements
7. 7Relevant NZ Standard
8. 8MBIE workmanship guidance
9. 9Professional assessment where still unclear

The question is:

What was actually required for this particular piece of work?

Not: “What would I personally have preferred?”

Dissatisfaction with something built to the agreed specification and a reasonable standard does not necessarily mean the work is defective.

Notify the right person in writing

Once you have recorded the issue, notify the appropriate contractor.

For a typical renovation managed through a main building contractor, MBIE says the homeowner should notify the main contractor in writing and the main contractor manages relevant repairs, including problems in work performed by their subcontractors.

If you separately contracted another tradesperson directly, notify that directly contracted trade yourself in writing.

Your notice does not need to make unsupported legal conclusions. It can simply record:

• the project;
• location of the issue;
• what you observed;
• when you discovered it;
• relevant contract/drawing/specification reference;
• photographs or evidence;
• what response you are requesting.

“I noticed the following issue in the ensuite on 18 September. It appears inconsistent with drawing A12 revision 4. Please review it and confirm your proposed response in writing.”

Keep a copy of the notification and any reply.

How the NZ 12-month defect-repair period works

The Building Act contains a specific remedy for certain defective residential building work notified within 12 months of completion.

Section 362Q applies where:

• building work relates to a household unit;
• the building work is defective;
• the defect can be remedied; and
• the work was carried out by or on behalf of a building contractor, or the relevant on-seller provisions apply.

For SeekSaver's renovation audience, the ordinary case is work carried out under a residential building arrangement.

When does the 12-month clock start?

MBIE explains the completion date as:

Completion is when all physical building work agreed between the homeowner and building contractor has been finished.

That does not automatically mean:

• the handover walkthrough date;
• CCC issue date;
• final-payment date;
• the date every later disagreement has been resolved.

If the completion date could be uncertain, get it confirmed in writing.

Does the project price matter?

MBIE says the 12-month defect-repair period applies to residential building work regardless of project price.

Do not confuse this with the separate $30,000 consumer-protection threshold that affects some written-contract requirements.

Does the notification need to be written?

Yes for the statutory repair obligation under section 362Q.

The legislation links the contractor's remedy obligation to notification in writing.

Keep evidence of:

• what you sent;
• the date;
• how it was sent;
• who received it;
• attachments.

How quickly must the contractor repair it?

The Act says within a reasonable time after written notification.

It does not prescribe one universal number of days.

What is reasonable can depend on the particular issue and circumstances.

Do not assume a universal 7-day, 14-day or 30-day repair deadline.

Who has to prove what during the initial period?

Section 362Q presumes its threshold conditions apply unless the contrary is proved. Section 362S separately places the onus on the contractor or on-seller to establish specified causes outside their responsibility. MBIE summarises the practical homeowner position as the contractor needing to show that disputed defective work was not their fault, their subcontractor's fault or due to products they used.

That does not mean every complaint automatically succeeds.

Section 362S includes responsibility qualifications for specified causes outside the contractor or on-seller's responsibility, including matters such as certain external events, damage by people outside their responsibility, lack of normal maintenance, or failure to arrange repair promptly after the problem became apparent.

Record the contractor's response

Once you notify the contractor, keep their response with the issue record.

Record:

• whether they agree there is a problem;
• whether they need to inspect;
• proposed repair/action;
• any explanation of cause;
• documents or technical information supplied;
• proposed timeframe;
• access requirements;
• follow-up date.

Do not convert an informal statement into something stronger than the contractor actually said.

If they say “We'll inspect it next week,” record that.

Do not record “Builder accepted liability” unless that is genuinely what was confirmed.

If repair work is carried out, review the result

After the contractor acts, do not simply delete the issue from your records.

Record:

• repair date;
• what was done;
• photographs after repair;
• relevant updated document;
• whether further monitoring is needed;
• whether the issue appears resolved;
• any outstanding question.

Use a neutral status such as Review after repair before moving to Resolved if appropriate.

“Resolved” in the SeekSaver record means only that the homeowner's project record treats the issue as closed. It is not a legal judgment.

What changes after the first 12 months?

The end of the initial 12-month defect-repair period does not mean all rights disappear.

Section 362Q expressly preserves the Building Act's implied warranties and does not limit the time for enforcing them.

Those implied warranties cover matters including:

• proper and competent work;
• compliance with agreed plans/specifications and relevant consent;
• suitable products;
• legal compliance;
• reasonable care and skill;
• applicable completion and fitness-for-purpose requirements.

MBIE explains that these warranties may continue to be relevant for up to 10 years.

Implied warranties may remain relevant for up to 10 years, but whether a particular problem breaches them and what remedy is available depends on the evidence and circumstances.

That does not mean “The builder must repair anything free for 10 years.”

After the initial 12-month period, if the contractor disputes the issue, the homeowner generally has a greater evidential burden in establishing that defective work exists.

Good records therefore become especially important.

Design problems need separate care

Part 4A of the Building Act defines building work for these consumer-protection provisions in a way that excludes design work.

If the problem appears to arise from design rather than construction, different rights or professional/consumer processes may be relevant.

Do not assume the 12-month building-contractor repair framework applies identically to a designer.

Project-specific professional or legal advice may be appropriate.

What if the problem remains unresolved?

Start with the least escalated appropriate step.

1. 1. Recheck the facts and contract

   Confirm the current project requirement, evidence, written notification, contractor response and what your contract says about resolving problems. Communicate clearly and keep important agreements in writing.

2. 2. Obtain technical advice where needed

   An appropriate independent professional may help establish the nature of the problem, likely cause, applicable standard or specification, and whether a proposed repair is suitable. Use the professional appropriate to the issue.

3. 3. Use the contract's dispute process

   If the parties disagree, check whether your contract provides negotiation, mediation or another dispute-resolution process. SeekSaver's Renovation Contract Checklist NZ explains areas a contract may address, but your signed contract controls your process.

4. 4. Consider third-party resolution where appropriate

   Depending on the type of dispute, official pathways can include mediation, adjudication for eligible construction-contract disputes, or arbitration where applicable. Not every option applies to every renovation problem.

5. 5. Consider an appropriate formal complaint where relevant

   A complaint about a licensed practitioner's conduct, for example, is different from a claim seeking repair or compensation. A complaint pathway does not necessarily decide the homeowner's private remedy.

6. 6. Tribunal or court where appropriate

   Suitable lower-value claims may fall within the Disputes Tribunal's jurisdiction, while other claims may require a different forum. MBIE determinations address particular Building Act, Building Code and council matters; they are not a general workmanship-dispute process.

Do not assume every workmanship dispute belongs in the Tribunal, every unresolved problem should go to court, or a particular claim will succeed.

Where substantial money, structural work, complex causation or legal rights are disputed, get project-specific professional or legal advice before choosing a formal pathway.

Renovation Issue & Defect Record

Use one record for each separate issue.

The record helps preserve:

• what you observed;
• the project requirement you are comparing it with;
• evidence;
• written notification;
• contractor response;
• repair/action;
• follow-up;
• outcome.

It is a project record.

It does not determine:

• that the work is legally defective;
• who is liable;
• what compensation is payable;
• what repair must legally be provided;
• whether you will succeed in a dispute.