Building projects do not always follow the original plans exactly.
A product becomes unavailable. A site condition is different from what was expected. A designer changes a detail. A builder identifies a better construction solution. Or the homeowner wants something different after the building consent has already been issued.
Once the building consent exists, the important question is no longer only:
“Do we agree to the change?”
You also need to ask:
“How does this proposed change affect the approved building consent, and what does the BCA require before the changed work proceeds?”
Do not decide for yourself that a change is a minor variation, a formal amendment, or too small to matter.
A safer process is:
Describe the proposed change → identify the current approved drawing/specification → record relevant designer/builder input → raise the proposed change with the BCA → provide the information it requests → record the BCA's actual treatment → keep the current approved version with the project
If the same change also affects your contract scope, price, timing or responsibilities, handle that separately using SeekSaver's Renovation Variations NZ process.
Jump to the Building Consent Change Record
Start with the current approved document
Before discussing the proposed change, establish what is currently approved.
Find the relevant:
- building-consent number;
- approved drawing;
- specification section;
- detail or schedule;
- current revision/version;
- approved amendment or earlier minor variation, if one already changed the original document.
Do not assume the earliest drawing in your email folder is still the current approved version.
A useful change record should show:
Current approved position: Drawing A12, revision 4, detail 3.
Proposed position: Replace the approved detail with revised detail A12, revision 5.
That is much clearer than:
“Change wall detail.”
The approved/current document is your regulatory baseline.
Raise the proposed change with the BCA before carrying out the changed work
MBIE's current guidance says councils need to assess proposed changes to previously consented building work and decide how those changes are approved and recorded. (Building.govt.nz)
For proposed minor variations, MBIE's current guidance specifically recommends contacting the BCA before the changed work is carried out and waiting for BCA approval of the minor variation. (Building.govt.nz)
The practical homeowner rule is:
If you want to change work covered by an issued building consent, raise the proposed change with the BCA before proceeding with the affected changed work and follow the process it specifies.
Do not leave the regulatory decision entirely to an informal conversation between homeowner and builder.
The builder or designer may handle the practical communication depending on your project arrangement, but keep a record of:
- when the BCA was contacted;
- what change was described;
- which documents were supplied;
- what the BCA said was required;
- the final recorded BCA decision/treatment.
The BCA decides how the proposed change is treated
New Zealand law provides different ways of dealing with changes to an issued building consent.
One is the statutory minor variation process under section 45A.
Other changes are dealt with as amendments to the building consent using the broader building-consent application framework under section 45(4). (Legislation New Zealand)
Do not treat those as labels the homeowner chooses.
Your role is to describe the proposed change accurately and provide the BCA with the information needed to assess it.
Record the BCA's actual position, for example:
- BCA recorded as minor variation
- BCA requires formal amendment
- Further information required
- Other BCA direction
- Needs clarification
Those are project-record statuses based on the authority's communication—not SeekSaver's legal classification.
What section 45A says about minor variations
The current Building Act gives a minor variation a simpler application process than a full amendment.
Under section 45A:
- it does not have to use the prescribed application form;
- the other applicable section 45 information requirements still apply;
- sections 48–50 apply with necessary modifications;
- if the BCA grants the variation, it must record it in writing;
- the BCA does not have to issue an amended building consent. (Legislation New Zealand)
That procedural flexibility does not mean:
“Minor variation means no BCA involvement.”
The BCA still determines whether the proposed change falls within that process and whether it can be granted.
What the current regulations mean by a minor variation
The current Building (Minor Variations) Regulations define a minor variation as a minor modification, addition or variation that does not deviate significantly from the plans and specifications to which the building consent relates. (Legislation New Zealand)
The regulations also contain examples.
But the examples are illustrative, not automatic rules.
A bathroom-layout change or product substitution appearing in an example does not mean every superficially similar real-world change is automatically a minor variation.
The BCA needs to consider the actual:
- consented design;
- proposed difference;
- Building Code implications;
- supporting information;
- project circumstances.
SeekSaver should therefore never ask you to complete a quiz and then announce:
“Your change is a minor variation.”
Formal amendment: when the BCA requires the fuller process
If a proposed change is not dealt with through section 45A, section 45(4) requires the amendment application to be handled as though it were an application for building consent, with the relevant statutory provisions applying with necessary modifications. (Legislation New Zealand)
The BCA may therefore require:
- revised drawings;
- revised specifications;
- design information;
- engineering information;
- product evidence;
- Building Code compliance information;
- other project-specific supporting material.
Follow your actual BCA's submission requirements.
Do not assume another council's portal, form naming or document process will be identical.
Product substitutions still need regulatory alignment
A product substitution can be a building-consent change.
The current Minor Variations Regulations now expressly address comparable products.
A comparable-product substitution can fall within the minor-variation definition where the statutory criteria are met—for example, where the replacement achieves equivalent performance and does not create the prohibited wider compliance or failure-consequence problems. (Legislation New Zealand)
But this does not create a homeowner shortcut:
“The products look equivalent to me, so we can substitute them.”
MBIE's current product-substitution guidance says the applicant needs to show the council how the proposed substitute satisfies Building Code performance and consider its effect on other work. (Building.govt.nz)
Record:
- original specified product/system;
- proposed substitute;
- reason for substitution;
- technical information supplied;
- designer/supplier input where relevant;
- BCA treatment.
Then follow the BCA's process.
Keep contractual variation and consent change as two separate questions
The same real-world change may trigger two different workflows.
Project / contract question
What have the homeowner and contractor agreed about:
- scope;
- price;
- timing;
- responsibility;
- product choice?
SeekSaver's Renovation Variations NZ guide owns that workflow.
Regulatory question
Does the issued building-consent documentation need to change, and how does the BCA require that change to be assessed and recorded?
This resource owns that workflow.
A builder and homeowner agreeing to a variation does not automatically update the building consent.
Likewise, a BCA approving a regulatory change does not by itself settle:
- price;
- contract entitlement;
- timing;
- commercial responsibility.
Keep both records where both processes apply.
If an inspection identifies a difference from the approved plans
Sometimes the proposed change is identified before work starts.
Sometimes a BCA inspector notices that built work differs from the approved documents.
Do not respond by deciding:
“It is probably only a minor variation.”
Instead:
- record the inspection/reference;
- record the exact difference identified;
- record the BCA's instruction;
- provide the requested drawings/information;
- follow the process the BCA specifies;
- keep the updated/current approved record.
SeekSaver's Building Consent Inspections NZ guide owns the inspection workflow itself.
This page begins at the point where the regulatory consent record needs to be aligned.
Do not keep building from superseded drawings
Version control matters.
Once the BCA has approved or recorded a change, identify clearly:
Current approved version
and
Superseded version
Keep:
- updated approved drawing/specification;
- BCA variation/amendment record;
- approval/reference date;
- related correspondence;
- relevant inspection record.
Do not leave several differently revised drawings in the project folder with no indication of which one controls.
Older MBIE amendment guidance also recommends retaining new information with the consent file and clearly identifying older documents as superseded. Although that guidance predates the current minor-variation regime, this version-control principle remains consistent with current law and guidance. (Building.govt.nz)
Make sure future inspections use the current approved position
Once the consent record changes, make sure relevant people have the current information.
That can include:
- builder;
- relevant subcontractor;
- designer;
- engineer;
- project manager;
- inspection coordinator.
The project's inspection record should align with the current approved drawings and specifications.
If another inspection is coming, use SeekSaver's Building Consent Inspections NZ guide to manage the inspection stage.
Do not assume a previous inspection result automatically approves a later design or construction change.
Keep the current consent record aligned for CCC
MBIE's current building-official guidance emphasises that a CCC is ultimately issued against the building-consent documentation. That is one reason changes during construction must be properly dealt with and recorded. (Building.govt.nz)
At project close-out, the BCA needs a coherent regulatory record showing what was approved and what was actually built.
That does not mean this page owns the CCC process.
SeekSaver's Code Compliance Certificate NZ guide owns:
- final sign-off evidence;
- Form 6;
- BCA requests;
- the actual CCC decision.
The role of this page is to help ensure that the current approved consent documents are correct before you reach that stage.
What not to assume
“It's only a small change, so council doesn't need to know.”
Do not make that decision yourself.
Raise proposed changes with the BCA and let it determine the required process.
“My builder agreed to it, so the consent is automatically updated.”
No. Contract/project agreement and regulatory consent alignment are separate.
“The inspector saw it, so the consent record must already be changed.”
Do not assume that.
Check what the BCA actually recorded.
“A similar product is automatically an approved minor variation.”
No.
Comparable-product rules have statutory criteria, and the actual proposed change must still be dealt with through the BCA process.
“Every change needs a completely new building consent.”
No.
Current law includes the section 45A minor-variation process as well as the broader formal-amendment route.
The BCA determines which process applies to the real project.