Intro
Before any residential project begins, one of the first questions we help clients answer is: what approvals are actually required before we can start building? In New Zealand, the answer is rarely just one document. Depending on the site, design, location, earthworks, drainage, access, and planning rules, a project may need a building consent, a resource consent, both, or additional council-related approvals before physical work can begin.
In our experience, this is where many projects lose time. Homeowners and developers often assume that drawings alone are enough to break ground, or that if work looks minor it must be exempt. In practice, we usually advise clients to confirm approvals early, because design changes, planning constraints, and incomplete documentation can cause avoidable delays once a file reaches council review.
For clients looking for end-to-end support, we typically handle these approval pathways as part of our project management process and coordinate buildability, consultants, and submission timing before site works begin. On development sites, we also align approvals with subdivision, servicing, and access requirements through our land development support.
Why approvals matter before work starts
New Zealand’s building system separates building compliance from planning compliance. A building consent focuses on whether proposed work will meet the Building Code. A resource consent addresses whether the project fits planning rules under the district or unitary plan, such as setbacks, height controls, site coverage, earthworks, stormwater effects, access, and neighbourhood impacts.
That distinction matters because a project can be structurally sound and still breach planning rules. We often see this on infill housing, terraced housing, sloping sites, and developments where site coverage, recession planes, or vehicle manoeuvring become issues late in the design phase.
As a rule of thumb, we do not recommend treating approvals as a paperwork formality. They affect programme, consultant scope, financing, procurement timing, and even whether a design is commercially viable to build as drawn.
The main council approvals to check before you start building
| Approval / check | What it generally covers | When we usually check it | Can work start without it? |
|---|---|---|---|
| Building consent | Whether the proposed building work complies with the Building Code | Early design and pre-construction | Usually no, unless the work is genuinely exempt |
| Resource consent | Whether the project complies with district or unitary plan rules | Concept design stage | No, if planning approval is required |
| Project Information Memorandum (PIM) | Council-held site information that may affect the project | Feasibility or consent strategy stage | Not always mandatory, but often useful |
| Earthworks / drainage / vehicle crossing / services-related approvals | Site works, public infrastructure connections, stormwater, wastewater, access works | Civil design and pre-start coordination | Often no, where specific approval is required |
| Engineering reviews or producer statements | Specialist design support for structure, geotechnical, stormwater, retaining, foundations | Before or during consent preparation | Usually needed to support approval, not as a substitute for it |
1) Building consent
For most new homes, terraced housing, villas, substantial renovations, structural alterations, retaining structures, and work affecting weathertightness or life safety, a building consent is the main approval required before construction starts.
MBIE’s Building Performance guidance states that you generally cannot start physical work until a building consent is issued, unless the work is exempt or an emergency situation applies. The same guidance also makes clear that even exempt work still needs to comply with the Building Code.
In practical terms, we usually expect building consent documentation to include enough detail for council to understand structure, envelope, fire safety where relevant, drainage, durability, energy efficiency, and how the project will comply with the Code. Where a design uses standard compliance pathways, consent processing is often more straightforward. Where it relies on alternative solutions, supporting evidence usually becomes more important.
On projects where we act as the main contractor, we typically review documentation before submission to reduce RFIs, clarify scope gaps, and identify coordination issues between architecture, engineering, and site execution.
2) Resource consent
A resource consent may be required when the proposal does not fully comply with the local planning rules, or where the activity itself triggers planning approval. In residential work, this often comes up with site coverage limits, height in relation to boundary, setbacks, outdoor living space, subdivision-related conditions, stormwater effects, access design, heritage overlays, tree controls, and larger earthworks.
One of the most common misunderstandings we see is the assumption that a building consent covers planning issues. It does not. If resource consent is needed, it should usually be resolved early enough that the detailed building design is not based on a planning outcome that later changes.
For Auckland and Christchurch projects especially, we recommend checking district or unitary plan controls at concept stage, not after full documentation. That is often the difference between a smooth application and an expensive redesign.
3) Project Information Memorandum (PIM)
A Project Information Memorandum, or PIM, is not always the approval people focus on first, but it can be valuable early in the process. A PIM can identify council-held information relevant to the site and the proposed work, such as drainage matters, special features, hazards, or other known constraints.
In our experience, a PIM is especially useful where a site has more complexity than a straightforward replacement dwelling: sloping sections, infill development, unusual service layouts, flood-sensitive areas, or lots with a deeper property file history.
We do not treat a PIM as a substitute for proper consultant due diligence, but it can help surface issues earlier and support a better consent strategy.
4) Other council-related approvals and pre-start checks
Depending on the project, there may be other approvals or council interfaces to resolve before works start on site. These can include:
- vehicle crossing approvals
- public drainage or wastewater connection approvals
- stormwater design acceptance
- earthworks-related approvals
- engineering approvals tied to subdivision or infrastructure conditions
- trade waste or utility-related requirements where applicable
- road opening or corridor access permissions for service works
Not every residential project will need all of these, but development and multi-dwelling sites often involve more than a simple building consent pathway. This is why we like to map approvals into the construction programme before procurement starts. If civil works, retaining, or service upgrades are on the critical path, the consent strategy needs to reflect that from day one.
What about exempt building work?
Some low-risk work can be carried out without a building consent under Schedule 1 of the Building Act, provided the exemption conditions are genuinely met. That said, we encourage caution here. The exemption does not mean the work can ignore the Building Code, and it also does not remove the need to check whether resource consent or other rules still apply.
We regularly see confusion around small additions, decks, detached structures, repairs, and minor alterations. The risk is that owners rely on a broad assumption that work is “minor,” only to find later that records, insurance, sale due diligence, or council review raise issues. If there is any uncertainty, our view is simple: verify the exemption position before committing to construction.
Common mistakes we see before construction starts
Assuming one approval covers everything
The most frequent mistake is treating building consent as the only gateway. In reality, planning, servicing, and site constraints can matter just as much.
Underestimating site complexity
Flat and simple sites are one thing. Sloping sites, rear lots, tight urban sections, and multi-unit projects are another. Access, retaining, stormwater detention, and neighbour interface issues can all reshape the approval pathway.
Submitting incomplete documentation
Consent delays often come from missing details, inconsistent drawings, unresolved engineering notes, or unclear product/specification information. We typically find that investing more effort before submission saves far more time later.
Starting enabling work too early
Owners sometimes assume preliminary site activity is harmless. But depending on what is proposed, even early works can create compliance issues if required approvals are not yet in place.
Ignoring property records
For renovations and additions, old plans, prior consents, drainage information, and previous unconsented work can all affect the current application. Reviewing the property file early is often worthwhile.
How we usually advise clients to approach approvals
Our practical approach is to work backwards from construction risk rather than forwards from drawings alone. That usually means:
- Confirming the planning position at concept stage.
- Checking whether the work clearly requires building consent or may fall under an exemption.
- Reviewing property information, site constraints, and servicing conditions early.
- Coordinating architecture, structural design, civil input, and any geotechnical advice before submission.
- Sequencing council approvals into procurement and site-start planning.
- Allowing time for RFIs, revisions, and inspection planning rather than assuming instant approval.
In our experience, this reduces redesign, budget drift, and programme surprises. It also gives owners a more realistic understanding of what “ready to build” actually means.
Practical takeaway
Before you start building, the approvals you may need usually extend beyond a single consent. For most residential projects in New Zealand, the first questions should be:
- Do we need a building consent?
- Do we also need a resource consent?
- Would a PIM or property file review help identify risks early?
- Are there drainage, access, earthworks, or service approvals to resolve?
- Is the documentation complete enough to avoid preventable delays?
If those questions are answered early, the project is usually in a much stronger position when it moves into pricing, procurement, and construction. If they are left too late, even a well-designed home can lose time and money before the first major trade arrives on site.
References
- Building Performance (MBIE) – Projects and consents
- Building Performance (MBIE) – Work you can do without a building consent
- Building Performance (MBIE) – How to support your building consent application
- Christchurch City Council – Property files
Author / Editorial Team
This article was produced by our internal editorial team in consultation with our residential construction and development specialists. We write from the perspective of teams involved in planning, coordination, build delivery, and project support across residential homes, terraces, and land development work. Our review process focuses on practical construction decision-making, council approval sequencing, documentation quality, and the real-world issues that affect programme, compliance, and handover outcomes.
