Regulation Decoded
How to Get an Occupation Certificate in NSW: Whole vs Partial OC, Documents Checklist and Timeframes
The Occupation Certificate is the document that makes a new building lawful to live in, open or sell. This guide explains when you need one, what replaced interim and final OCs in 2019, the full documents checklist, how fire safety certificates fit in, how long it takes, and what happens if you occupy without one. Written by the registered certifiers at Built Smart Solutions in Sydney.
CURRENT AS AT 27 OCTOBER 2026
19 MIN READ
BY BUILT SMART SOLUTIONS
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Quick answer
An Occupation Certificate (OC) in NSW is the certificate that authorises a new building, or a building whose use has changed, to be occupied and used. It is issued by the Principal Certifier once the building work is complete, every mandatory inspection has been carried out, the required compliance certificates and the fire safety certificate (required for every building other than a Class 1a dwelling or a Class 10 structure) are in, and the conditions of the CDC or development consent that must be met before occupation have been satisfied. You apply through the NSW Planning Portal.
Since 1 December 2019, the old “interim” and “final” OCs no longer exist. There is one Occupation Certificate, issued for the whole building or for the completed part of a partially completed building (a partial OC). With a complete document set, the OC can usually follow the final inspection within days; most delays trace back to a missing document or an unmet condition. Occupying without one is an offence and affects sale, insurance and finance. Built Smart Solutions issues Occupation Certificates across Sydney and NSW and runs a progressive checklist from day one so the last document does not become the hardest.
Key takeaways
- No OC, no occupation. A new building (including an altered part or an extension), or a building whose BCA classification is changing, cannot lawfully be occupied or used without an OC, subject to a few narrow exceptions.
- “Interim” and “final” are old terms. Since 1 December 2019 there is one OC, issued for the whole building or for part of it (a partial OC).
- The Principal Certifier issues it, through the NSW Planning Portal, after the final inspection and document review.
- Documents decide the timing. Waterproofing, glazing, smoke alarm, termite, BASIX, stormwater, pool and fire safety certificates should be collected during the build, not after it.
- Conditions matter as much as construction. Landscaping, Sydney Water, driveways and other “prior to OC” conditions must be met before the certificate can issue.
- Partial OCs are available where part of a building is complete and safe to occupy while work continues elsewhere. The first partial OC carries a condition that an OC for the whole building is obtained within 5 years of it.
- Built Smart Solutions collects compliance documents stage by stage, so the OC is not left waiting on paperwork at the end.
What an Occupation Certificate is
An Occupation Certificate is the last certificate in the NSW building approval process. It confirms that the Principal Certifier is satisfied the building is suitable to occupy and use in accordance with its classification under the National Construction Code, and that the work and the use are consistent with the approval. It is issued under Part 6 of the Environmental Planning and Assessment Act 1979 and recorded on the NSW Planning Portal.
The OC is what lets you:
- move into a new house, granny flat or apartment, or let a tenant move in;
- open a shop, office, gym or warehouse for business;
- register a strata plan or complete a subdivision of new dwellings;
- settle a sale of an off-the-plan or newly built property;
- satisfy your lender and your insurer that the building is lawful.
The OC is issued by the Principal Certifier appointed for the project, who may be a private registered certifier or council. Built Smart Solutions issues Occupation Certificates as Principal Certifier on residential, commercial and industrial projects across Sydney and NSW.
When you need an Occupation Certificate
| Situation | OC required? | Notes |
|---|---|---|
| New building (house, granny flat, dual occupancy, apartment building, commercial or industrial building) | Yes | Before anyone occupies or uses it |
| New part of an existing building (addition, extension, new storey) | Yes | For the new part |
| Change of use where the NCC classification changes | Yes | For example warehouse to gym; see our commercial and industrial CDC guide |
| Staged occupation of a partly completed building | Yes: partial OC | For each part as it is occupied |
| Alterations under a CDC or DA with no new floor area (for example a new bathroom) | Usually yes | An altered part of a building counts as a new building for OC purposes. The Act allows a compliance certificate to stand in for an OC in limited cases, so check what your approval requires |
| Swimming pool | Usually yes | The barrier is inspected once it is erected, and the pool must be registered on the NSW Swimming Pool Register. A compliance certificate can stand in for an OC in limited cases |
| Exempt development | No | No approval, so no OC; confirm it is genuinely exempt with exempt development advice |
| Crown development | No | The Act exempts buildings erected by or on behalf of the Crown |
Interim vs final OC: what changed in 2019
If you search for “interim occupation certificate” or “final occupation certificate”, you will find plenty of pages still using those terms. They describe the system that applied before 1 December 2019.
| Period | OC types | What they mean |
|---|---|---|
| Before 1 December 2019 | Interim OC and final OC | An interim OC allowed occupation of part or all of a building before everything was finished; a final OC was issued at completion |
| From 1 December 2019 | OC for the whole building, or a partial OC | One kind of certificate, issued either for the whole building or for an identified part that is complete and safe to occupy |
A partial OC authorises occupation of the completed part of a partially completed building. The certifier must not issue it if the building is a hazard to the health or safety of the occupants, the completed part must be consistent with the development consent, and, for buildings that need one, a fire safety certificate must cover that part. That is an interim fire safety certificate, which is a different document from the OC and is often confused with the old interim OC. The first partial OC carries a statutory condition: an OC for the whole building must be obtained within 5 years of it. Partial OCs are common on apartment buildings, mixed-use projects and staged industrial estates. The obstacle is usually factual rather than legal: a fire detection system designed as one system across a building cannot be signed off for one floor until it has been commissioned across all of them.
What the Principal Certifier must be satisfied of
Before issuing an OC, the Principal Certifier must be satisfied of several things. In plain terms:
- An approval exists for the work and the use: a CDC, or a development consent and Construction Certificate.
- The building is suitable for occupation in accordance with its NCC classification.
- Every mandatory critical stage inspection was carried out. A missed inspection can be treated as not required only in narrow circumstances, and a missed final inspection cannot be cured at all.
- The conditions of the approval that must be met before occupation, or before the OC, have been satisfied.
- A fire safety certificate has been issued for the building, or for the part being occupied (every building other than a Class 1a dwelling or a Class 10 structure).
- The BASIX commitments the certifier is required to monitor have been fulfilled, and the BASIX completion receipt has been obtained where the BASIX certificate requires the certifier to monitor a commitment (not needed for a partial OC).
- The required documents from trades, engineers and consultants have been provided and reviewed.
For a new building approved under a consent issued since 1 March 2013, the test is whether the building is consistent with the development consent. That is stricter than the old “not inconsistent with” wording many people still quote. A departure that fails the test needs the approval modified before the OC can issue. That is why changes made on site are one of the biggest causes of OC delays.
Occupation Certificate documents checklist
This is the checklist Built Smart Solutions works from on residential projects, with the additional items for apartments and commercial buildings. Not every item applies to every project; your approval conditions decide the final list.
| Document | Provided by | Applies to |
|---|---|---|
| Waterproofing certificate (AS 3740) for wet areas | Licensed waterproofer | All buildings with wet areas |
| Glazing certificate (AS 1288 / AS 2047) | Window and glass supplier or installer | All |
| Smoke alarm certificate (AS 3786, hard-wired, interconnected where required) | Licensed electrician | Residential |
| Termite management certificate (AS 3660.1) and durable notice | Pest installer | Where termite protection is required |
| Structural engineer’s certification (footings, slab, framing, retaining) | Structural engineer | Where required by the approval or certifier |
| Stormwater certification and works-as-executed plans | Hydraulic engineer / plumber | Where required by conditions |
| Plumbing and drainage certificate of compliance | Licensed plumber | All with plumbing |
| BASIX completion receipt and supporting evidence (insulation, glazing, hot water, rainwater tank) | Builder, certifier via the Portal | Where the BASIX certificate requires the certifier to monitor a commitment |
| Sydney Water Section 73 compliance certificate | Sydney Water, usually through an accredited Water Servicing Coordinator | Where conditioned, in Sydney Water’s area of operations (often subdivisions and dual occupancies) |
| Pool barrier inspection and pool registration | Certifier (barrier), owner (registration) | Swimming pools and spas |
| Fire safety certificate for every measure on the fire safety schedule | Owner, on accredited practitioner assessment | Every building other than Class 1a and Class 10 |
| Mechanical ventilation and exhaust certification | Mechanical engineer / installer | Commercial kitchens, car parks, internal bathrooms |
| Access compliance statement | Access consultant | Commercial, Class 2 common areas, where conditioned |
| Design compliance declarations and building compliance declaration | Registered practitioners | Class 2, 3 and 9c buildings (regulated buildings) under the Design and Building Practitioners Act 2020 |
| Evidence of conditions met (landscaping, driveway, footpath, street trees, dilapidation, bonds) | Builder, owner, council | As conditioned |
Ask your certifier for the OC checklist at the start of the job, not the end. Give each trade the certificate they owe when they are engaged, and collect it before they leave site. Built Smart Solutions’ Occupation Certificate service issues a project-specific checklist on appointment and ticks items off at each inspection, so nothing is left to chase once the builder has left site.
How to get an Occupation Certificate: step by step
Get the OC checklist on day one
When you appoint your Principal Certifier, ask for the full list of documents and conditions the OC depends on, and give it to your builder.
Pass every critical stage inspection
Book each mandatory inspection before the work is covered. The legal duty to make sure they happen sits with the person who has the benefit of the approval, not the certifier, and a missed inspection is the hardest OC problem to fix.
Collect compliance certificates as you go
Waterproofing after the wet areas, glazing when windows go in, termite after the barrier, smoke alarms at fit-off. Send them to the certifier as each is issued.
Satisfy the “prior to occupation” conditions
Landscaping, driveway crossings, Sydney Water, street trees, BASIX items and any other conditions that must be met before the OC.
Obtain the fire safety certificate (if applicable)
For every building other than a Class 1a dwelling or a Class 10 structure, each measure on the fire safety schedule must be assessed by an accredited practitioner (fire safety), and the owner issues the fire safety certificate. See our fire safety guide.
Book the final inspection and apply on the Portal
Lodge the Occupation Certificate application on the NSW Planning Portal and book the final inspection with the Principal Certifier.
Close out any defects and receive the OC
Fix anything identified at the final inspection, provide any outstanding documents, and the certifier issues the OC through the Portal. Keep a copy with your property records.
How long an Occupation Certificate takes
| Scenario | What to expect after the final inspection |
|---|---|
| House or granny flat, all documents collected during the build | Usually a matter of days |
| House with a few outstanding certificates | Usually a few weeks, depending on the trades |
| Defects found at final inspection | Time to rectify, plus a re-inspection |
| Commercial fit-out or change of use | Usually a few weeks, driven by the fire safety certificate |
| Apartment building (partial OCs) | Weeks to months, staged; the fire safety certificate, the practitioner declarations and any Fire and Rescue NSW report drive timing |
| Missed inspection or work that does not match the approval | Weeks to months, if it can be resolved at all: evidence the certifier can rely on, or a modification to the approval. A missed final inspection cannot be cured |
Our article Occupation certificate delays explores the causes of the long-tail cases in detail. The short version: almost every slow OC traces back to something that could have been dealt with during construction.
What happens if you occupy without an Occupation Certificate
| Area | Risk |
|---|---|
| Legal | Occupying or using a building without a required OC is an offence; council can issue orders and penalty notices |
| Selling | The buyer’s solicitor and lender will ask for the OC; missing OCs delay or derail settlement |
| Insurance | Insurers may decline claims on unapproved or uncertified building work |
| Finance | Lenders may not release the final progress payment or refinance without an OC |
| Renting | Letting an uncertified dwelling exposes the landlord to liability |
| Strata and subdivision | Strata plans and subdivision certificates generally need the OC first |
Older buildings with no OC
Many older buildings, or work done years ago, have no OC on record. Two situations look alike and are not. Where a Principal Certifier was appointed and the OC was simply never issued, the original certifier, or a replacement, may be able to complete it once outstanding inspections and documents are dealt with, although an inspection that was required and missed is a harder problem. Where the work was never approved at all, no certificate approves it after the fact, because approvals operate only for the future. Which situation you are in, and what can realistically be done, depends on the file. Built Smart Solutions can review it and tell you where you stand before you list the property or lodge anything.
Occupation Certificates by project type
The core requirements are the same for every OC, but each project type has its own sticking points. These are the ones we plan for from the start.
| Project | What usually decides the OC | Related guide |
|---|---|---|
| New house | Six inspections, wet area waterproofing, BASIX completion receipt, smoke alarms, landscaping conditions | Appointing a Principal Certifier |
| Granny flat | Fire separation near boundaries, BASIX, plumbing and stormwater connection | Granny flat approval NSW |
| Dual occupancy or terraces | Inspections for each dwelling, party wall fire and sound separation, Sydney Water Section 73, subdivision certificate | Dual occupancy rules |
| Pattern Book home | Building matches the pattern’s development standards, location requirements and technical drawing set | Pattern Book guide |
| Apartments (Class 2) | Expected completion notice to the Secretary between 6 and 12 months before the OC application, fire safety certificate, design and building compliance declarations, Fire and Rescue NSW fire safety system report, partial OCs by stage, strata registration | Inner West case study |
| Commercial fit-out or change of use | Fire safety certificate, egress and accessibility, mechanical exhaust; the first annual fire safety statement falls due within 12 months of the final fire safety certificate | Commercial and industrial CDCs |
| Warehouse or industrial | Sprinkler and hydrant certification, fire compartments, staged partial OCs | Western Sydney case study |
| Swimming pool | Barrier inspection once erected, pool registration | Occupation Certificates |
What changes when the new Building Act commences
The Building (Approvals and Practitioners) Act 2026 received assent on 14 August 2026. When it commences, Occupation Certificates will be replaced by completion approvals and Construction Certificates by building approvals, issued by an approval authority: a council, a person whose registration allows them to issue the approval, or the Planning Minister for Ministerial consents. Occupying a building without a completion approval will be an offence, and the Act says expressly that a building approval or development consent does not authorise occupation.
Apart from two minor provisions, the Act commences on a day or days to be appointed by proclamation, and none had been appointed when this guide was last checked. The regulations that will make it work are still being developed. Until it commences, the OC process in this guide applies, and how projects already under way are treated will depend on savings and transitional regulations that have not yet been made. Our article on Construction Certificates being replaced covers the transition in detail.
Close to completion and need an OC?
Built Smart Solutions can issue your Occupation Certificate, or review a stalled project and tell you exactly what is needed to finish it.
Common Occupation Certificate mistakes
Treating the OC as a formality at the end
The OC is the sum of everything that happened during the build. Problems at OC stage were created months earlier.
Moving in at practical completion
The builder’s handover is not the OC. Moving in or letting tenants in before the OC is issued is an offence.
Not collecting certificates from trades
A waterproofer who has moved on to the next job is hard to get a certificate from. Collect before final payment.
Forgetting “prior to OC” conditions
Landscaping, driveway crossings and Section 73 certificates are as important as the building itself.
Changing the design without approval
A building that is not consistent with its approval needs the approval modified before the OC.
Leaving fire safety to last
On commercial and apartment projects, the fire safety certificate is the most common last-minute hold-up. See annual fire safety statements for what follows.
Reports that do not match the building
How Built Smart Solutions helps
Built Smart Solutions is a Sydney-based team of registered certifiers, ISO 9001 certified, with more than 20 years in certification, fire safety and regulatory policy. We treat the Occupation Certificate as something you build towards from the first inspection.
| You need | Built Smart service |
|---|---|
| The OC for your project | Occupation Certificates |
| A Principal Certifier and inspections | Principal Certifier Appointment |
| The approval to build | Complying Development Certificates or Construction Certificates |
| Fire safety strategy and schedule | Fire Safety Strategy & Reports |
| NCC compliance advice | BCA Consulting |
| Access compliance advice for commercial or Class 2 | Access Consulting |
| A modification to a development consent | Town Planning |
Our consulting services are separate engagements from our certification work. On any one project, Built Smart Solutions acts as your certifier or your consultant, not both, so the certification stays independent.
A checklist from day one, ticked off at every inspection. Documents chased as they fall due, not at the end. Fire safety planned early on commercial and apartment work. Honest advice on stalled projects. Across Sydney and regional NSW. See our Inner West apartments case study: certification and fire safety from CC through to OC.
Final verdict
An Occupation Certificate is not a stamp you collect at handover. It is the result of every inspection, certificate and condition across the whole build. Projects that collect documents as they go, plan fire safety early and keep the building matching its approval can get their OC within days. Projects that leave it to the end wait weeks or months, often with a settlement or a lease hanging on it.
If you are building now, or have a project that stalled before the OC, Built Smart Solutions can help. See our Occupation Certificate service, get a fee proposal or call (02) 9127 8249.
Frequently asked questions about Occupation Certificates in NSW
What is an Occupation Certificate in NSW?
An Occupation Certificate is the certificate issued by the Principal Certifier that authorises a new building, a new part of a building, or a building whose BCA classification is changing to be occupied and used. It confirms the building is suitable for occupation under its National Construction Code classification and consistent with its approval.
Who issues an Occupation Certificate?
The Principal Certifier appointed for the project, which may be a registered private certifier or council. The application is made through the NSW Planning Portal and the certificate is issued and recorded there.
What is the difference between an interim and a final Occupation Certificate?
Interim and final OCs belong to the system that applied before 1 December 2019. Since then there is a single type of Occupation Certificate, issued either for the whole building or for the completed part of a partially completed building as a partial OC. The interim fire safety certificate, which covers part of a building, is a different document and still exists.
What is a partial Occupation Certificate?
A partial OC authorises occupation of the completed part of a partially completed building. The certifier must not issue it if the building is a hazard to the health or safety of the occupants, the completed part must be consistent with the development consent, and a fire safety certificate must cover that part where one is required. The first partial OC carries a condition that an OC for the whole building is obtained within 5 years of it.
What documents are needed for an Occupation Certificate?
Typically waterproofing, glazing, smoke alarm and termite certificates, structural and stormwater certification, plumbing compliance, the BASIX completion receipt, Sydney Water Section 73 certificate where required, pool barrier compliance, a fire safety certificate for buildings with fire safety measures, and evidence that conditions required before occupation have been met.
How long does it take to get an Occupation Certificate?
With all documents collected during construction, a house OC can usually follow the final inspection within days. Outstanding certificates, defects, fire safety certification or work that is not consistent with the approval can extend that to weeks or months.
Can I live in my house without an Occupation Certificate?
No. Occupying a new dwelling, or a dwelling whose use has changed, without a required Occupation Certificate is an offence in NSW and can lead to council orders, penalties, insurance problems and difficulty selling or refinancing.
Who applies for the Occupation Certificate?
Only a person eligible to appoint the Principal Certifier can apply, which in practice means the owner or the person with the benefit of the approval. The application is lodged through the NSW Planning Portal, usually with the Principal Certifier or builder coordinating. The Principal Certifier then carries out the final inspection, reviews the documents and issues the certificate.
What is a fire safety certificate and why does my OC need one?
A fire safety certificate is issued by or on behalf of the owner. It certifies that each fire safety measure on the building’s fire safety schedule has been assessed by an accredited practitioner (fire safety) as capable of performing to at least the standard in the schedule. For any building other than a Class 1a dwelling or a Class 10 structure, the certifier cannot issue the OC without one.
Can a certifier refuse to issue an Occupation Certificate?
Yes. If the building is not consistent with its approval or not suitable for occupation under its BCA classification, a required inspection was missed, conditions that must be met before the OC are outstanding, or a required certificate is missing, the certifier must not issue the OC. Most of these can be fixed with rectification, further evidence or a modification to the approval. A missed final inspection cannot.
My builder has finished but the OC has not been issued. What do I do?
Ask the Principal Certifier for the list of what is outstanding: documents, defects or conditions. Most items are certificates the builder or trades owe. A Principal Certifier can be replaced only by agreement between you, the current certifier and the new one, or with the written approval of the Registration Secretary under the certifier legislation (applications go through Building Commission NSW). A new certifier such as Built Smart Solutions can then review the file and complete the OC.
What if my property was built or extended without an OC years ago?
If the work was never approved, no certificate approves it after the fact, because approvals operate only for the future. What can be done depends on what was built, when and how, and it is worth getting advice before you list the property. If it was approved and a Principal Certifier was appointed but the OC was never issued, it may be possible to complete the OC once outstanding inspections and documents are dealt with.
Do I need an OC for a swimming pool?
Usually yes, where the pool was approved by a CDC or DA, although the Act allows a compliance certificate to stand in for an OC in limited cases. The barrier must be inspected once it is erected, and the pool must be registered on the NSW Swimming Pool Register.
Is an OC needed to register a strata plan or sell off the plan?
Generally yes. Strata registration and many subdivision certificates depend on the OC, and off-the-plan contracts generally make settlement conditional on it. Partial OCs can allow staged settlements where parts of a building are complete.
Does Built Smart Solutions issue Occupation Certificates outside Sydney?
Yes. Built Smart Solutions acts as Principal Certifier and issues Occupation Certificates across Sydney and regional NSW, with every inspection attended in person.
Get your Occupation Certificate without the last-minute scramble.
A checklist from day one, every inspection in person and no paperwork left to chase at the end, from one Sydney team on a fixed fee. ISO 9001 certified.
Related reading from Built Smart Insights
This guide reflects Part 6 of the EP&A Act 1979, the Development Certification and Fire Safety Regulation 2021 and NSW practice as at 27 October 2026. The Building (Approvals and Practitioners) Act 2026 had not commenced at that date. Document requirements depend on the approval and building type, and timeframes vary by project. Nothing in this article is advice about a particular property. For a fixed fee, request a fee proposal.
