Duplex & Dual Occupancy Approvals QLD
Building a duplex or dual occupancy comes with plenty on your plate. With Buildcert, you get practical guidance, expert support, and a smoother path to sign-off.
We've got your new home approvals sorted, with expert guidance every step of the way.
In Queensland, duplexes and dual occupancies need building approval, and depending on your site, you might also need a Development Approval (DA) from council.
But don’t sweat it! Buildcert sorts the lot, helping you figure out the right approval pathway, preparing and lodging the paperwork, handling inspections, and issuing the final Form 11 Certificate of Occupancy when it’s all done.
[ Our approach ]
How Buildcert gets your approval sorted.
01
Kicking OffWhat it is
Before you get started, we'll assess your plans and site details. This helps determine if any council applications are needed. If you do need a Referral Agency Application or Development Approval (DA), we can help with this too.
What's involved
To kick this off, we just need you to provide design plans (site layouts, floor planning, elevations, etc.). We’ll check zoning, planning overlays (e.g., heritage, character, bushfire, flood), and confirm your plans align with the codes and standards that apply in QLD. We are here to walk you through each step so you are clear on what’s needed.
Next steps
Once any necessary planning approvals are sorted, the approval process starts.
02
Plans in, Paperwork RollingWhat’s involved
We’ll prepare and submit your building approval. If any additional council applications are required, we’ll prepare and lodge them on your behalf.
Why it matters
Lodging the right info at the right time speeds things up. No back and forth. No delays.
What we check
We check things like setbacks, height restrictions, site coverage, overlays, structural adequacy, accessibility and energy efficiency.
What's next
Once everything is checked off, we will issue your Decision Notice (Building Approval) which is the green light to start your project.
Good to go!
03
Construction & InspectionsWhat's involved
Your building approval will list what inspections are required during construction. Mandatory inspections are conducted throughout the build making sure everything lines up with your approved plans and any legal requirements. Your building approval spells out the mandatory inspections needed during construction. At completion, we’ll carry out a final inspection and take a look at the required Aspect Certificates (covering things like energy compliance, structural sign-offs, waterproofing, drainage etc.) before giving the green light.
Why it matters
Missed inspections or skipped paperwork can stop your project in its tracks. Inspections can be easily booked here.
There’s a lot of moving parts, but don’t sweat. We’ll sort it.
04
Signed, Sealed & SortedOutcome
We issue and lodge to Council your Form 11, the final certificate of occupancy that confirms the project meets QLD building regulations.
Why it matters
It’s your official sign-off, needed for occupancy and peace of mind.
Next steps
Sound too good to be true? Find out for yourself, speak to our team today.
[ Services ]
The right solution, every time.
Everything you need to get your approval sorted, in one place.
[ Why choose Buildcert ]
Certification sorted.
For projects big or small, Buildcert gets your certification sorted. Trusted experience, clear communication and fast turnarounds mean you get less stress, more certainty, and support to keep your project moving.
- +47000Approvals issued.That's over 47,000 approvals, sorted.
- 15.6B$Total value of construction approved.$15.6B of construction approved and counting.
- +275000Inspections completed.Clients trust Buildcert because we’ve got the experience and know-how to get your certification sorted.
"Buildcert’s building compliance expertise was invaluable during our recent upgrades. Their team brought confidence, clarity and professionalism to a complex project, ensuring everything stayed compliant and on track from start to finish."
"Buildcert has been a reliable partner for years. Their proactive approach, local knowledge, and responsiveness take the stress out of certification for our team."
"Buildcert are a valuable partner for our team. Their practical guidance, collaborative approach and clear advice help us deliver bespoke designs that meet compliance without compromising creativity."
Planning a dual occupancy? Let’s get your approval sorted.
Frequently asked questions.
Thinking about building a duplex or dual occupancy home in Queensland? These FAQs cover the essentials, so you know what approvals you need, how long it takes, what to expect, and how Buildcert gets your certification sorted.
What’s the difference between planning approval and building approval? Do all projects need approval from Council?
Planning approval (sometimes called a Development Approval - DA) is issued by the local Council. It deals with land use and relaxation matters such as setbacks, zoning, flood or heritage overlays. Building approval is issued by a certifier and relates to how the structure is designed and built to meet the Building Code and legislation.
Some projects need both planning and building approvals and others can go straight through private certification. If council approval is required, we’ll guide you on that process and coordinate referrals as part of our role.
Do I need building approval for my project?
In QLD, most residential structural work requires building approval, like new homes, extensions, carports, garages, pools, retaining walls, patios, and decks. Some minor work may be exempt or accepted development if they meet certain size and height limits and are outside of setback areas. If you’re unsure, it’s best to check with us before starting, we’ll confirm what applies to your project.
What documents are needed to start an approval?
A typical submission includes:
- Site plan, floor plans, elevations
- Engineering details if required
- Design compliance (Form 15) if required
- Energy efficiency report
- Soil/site data
- Title Search
- The correct Development Application (DA) form (usually DA Form 2 for building work)
This can change depending on the project, but don’t worry, we will guide you through what's needed.
What do I need for quoting?
A site plan should identify the structure on your property and show setbacks to boundaries and existing structures. If you wish to create your own, you can visit Site Plans Online, however we recommend using a professional architect or draftsperson.
How long does an approval last? Can it lapse?
Your building approval is valid for 18 months. If work hasn’t substantially started or finished within that timeframe, the approval will lapse.
A Form 57 reminder will be issued 3-6 months before the deadline. And if you need more time, there may be options to extend upon application.
How long does approval take?
This depends on the completeness of documents, whether planning referrals (e.g., relaxation variations, overlays) are needed, and how quickly RFI items are returned. We aim to have your project reviewed within 3-5 business days of engagement.
Toolbox
Sorted.
