If you’ve built something on your Queensland property without council approval, you can usually bring it into compliance by applying for retrospective (as-built) building approval through a private building certifier or your local council. Building without council approval in QLD is a development offence under the Planning Act 2016, with a maximum penalty of 4,500 penalty units — over $750,000 at the penalty unit value of $166.90 that applies from 1 July 2025.1Queensland Government. Offences and Enforcement2Queensland Government. Value of a Penalty Unit Homeowners almost never face the ceiling, but the enforcement powers, insurance gaps, and resale problems that come with unapproved work are the real costs you need to deal with.
Was Approval Actually Required?
Not every bit of building work needs a permit, and the first question is whether your project was ever caught in the first place. Queensland sorts development into three buckets: accepted development (no approval needed, though some has conditions attached), assessable development (an application has to be lodged and approved before work starts), and prohibited development (can’t be approved at all).3Queensland Government. What Is Development Assessment?
Schedule 1 of the Building Regulation 2021 lists work treated as accepted development. A fence up to 2 metres above natural ground level is a common example, provided it isn’t a barrier for a regulated swimming pool.4AustLII. Building Regulation 2021 – Schedule 1 Minor repairs, routine maintenance, and cosmetic jobs like painting or replacing floor coverings generally fall outside the definition of “building work” altogether.
The moment a project affects structural integrity, changes a building’s classification (converting a garage to a bedroom, for instance), or touches regulated systems like plumbing and drainage, approval is almost certainly required. The same type of structure might be accepted development in one council area and assessable in another, because local planning schemes feed into the classification. If you aren’t sure which bucket your finished work sits in, the planning counter at your local council can tell you.
What Councils Can Do to You
Councils rarely find unapproved work through aerial surveillance. Most cases start with a neighbour’s complaint, a building certifier spotting something during an unrelated inspection, or an issue surfacing when the property goes on the market. The gap between construction and discovery can be years, which breeds a false sense of security.
When the council’s assessing authority has reason to believe a development offence has occurred, the sequence is usually predictable. A show cause notice goes out first, giving you a chance to explain why enforcement action shouldn’t be taken. If the response doesn’t satisfy the council, it issues an enforcement notice spelling out what you have to do — demolish, modify, or obtain retrospective approval — and by when. Failing to comply with an enforcement notice is itself an offence with further penalties.1Queensland Government. Offences and Enforcement
Owner builders have extra exposure. The QBCC warns that building without the required permit can mean fines, prosecution, cancellation of your owner builder permit, a six-year ban on reapplying, and an enforcement order from council to remove the unapproved work.5QBCC. Responsibilities of an Owner Builder An owner builder project with retail material cost exceeding $11,000 (including GST) needs an owner builder permit from the QBCC regardless of whether you paid trade prices.6QBCC. About Owner Building
The worst outcomes land on people who ignore the process. A council that issues a show cause notice and gets cooperation will almost always prefer to see the problem fixed over launching a prosecution. Engagement is what shifts the dynamic.
Fixing It With Retrospective Approval
Retrospective approval, sometimes called “as-built” approval, is the main path to legalising unapproved work. The process mirrors what would have happened with a standard application, except the certifier assesses finished work against current standards instead of reviewing plans.
You can engage either a private building certifier or your local council to handle it. A private certifier holding a Class A licence with development approval endorsement has authority to issue building permits.7QBCC. Certifier Private certifiers are usually faster than council. Either way, the certifier has to be satisfied the work complies with the relevant building assessment provisions.
What You’ll Need to Hand Over
The documentation package is heavier than for a standard application because you’re describing something that already exists. Expect to pull together:
- As-built drawings showing floor plans, elevations, and structural details of the structure as it stands, typically prepared or certified by a qualified designer or engineer.
- A site plan showing where the unapproved structure sits on the lot, including setbacks from boundaries and distances to other buildings.
- Engineering reports, often including a Form 15 compliance certificate covering the design or specification of particular building aspects. The Form 15 is made under the Building Act 1975 and sections 73 and 77 of the Building Regulation 2021 and must identify the standards and codes relied on.8Queensland Government. Form 15 Compliance Certificate for Building Design or Specification
- Specialist reports for plumbing, drainage, electrical, or termite management, depending on the work.
- Any construction photos, contractor correspondence, or material receipts that document what was done and how.
Inspection, Remedial Work, and Sign-Off
The certifier’s job here is harder than a standard approval, where inspections happen at each construction stage. Expect them to need physical access to parts of the structure normally hidden. Removing sections of wall lining to inspect framing, insulation, and wiring is common. So is exposing sub-floor areas to check foundations and bearers. This invasive inspection is often the most expensive and disruptive stage.
If the certifier finds non-compliant work, you’ll have to carry out remedial work before approval can be granted. Costs escalate quickly at this point. A structure built 15 years ago might have met the codes of its era but fall short of current rules on bracing, energy efficiency, or accessibility.
Once the certifier is satisfied the work complies, they issue a Form 21 final inspection certificate for single detached class 1a buildings and class 10 buildings or structures, certifying the work is compliant.9Queensland Government. Form 21 Final Inspection Certificate For swimming pools, a Form 17 does the equivalent job.
When Retrospective Approval Isn’t Granted
Approval isn’t guaranteed. If the structure can’t be brought into compliance at reasonable cost, or if it fundamentally violates planning requirements like setback distances or height limits that can’t be varied, approval will be refused. Your options then narrow to modifying the structure until it complies, applying for a relaxation or variation of the relevant planning provisions (which councils grant sparingly), or demolishing the work.
Demolition at your own expense is reserved for structures posing genuine safety risks or sitting in locations no modification will fix. It’s uncommon for minor works, but a real possibility for substantial additions built in flood zones, over easements, or too close to boundaries.
The Costs That Hit Even If Council Never Notices
Unapproved work causes serious problems when you go to sell. Queensland’s Seller Disclosure Scheme, which commenced on 1 August 2025 under the Property Law Act 2023, requires sellers to include information about notices received under the Building Act 1975, the Planning Act 2016, and the Queensland Building and Construction Commission Act 1991 in the disclosure statement.10Queensland Government. Seller Disclosure Scheme
If disclosure is inaccurate or incomplete, even unintentionally, the buyer can terminate the contract any time up to settlement. The buyer has to show the issue was material, that they didn’t know about it when they signed, and that they wouldn’t have signed if they had. An undisclosed enforcement notice clears that bar easily.10Queensland Government. Seller Disclosure Scheme
Beyond disclosure, there are practical effects on value. Lenders may refuse to finance a purchase if a valuer flags unapproved structures, because their security becomes uncertain. Buyers who find the issue during due diligence either walk away or demand a price reduction to cover the cost and risk of sorting approval themselves. Fixing approvals before listing is almost always cheaper than the discount you’d accept at the table.
Insurance is another pressure point. If damage occurs in connection with unpermitted work — an electrical fire in an unapproved room addition, for example — your insurer may deny the claim because the work was never inspected and may not have met code. Some insurers exclude cover entirely for portions of a home with known unapproved work.
Personal liability is the risk most people miss. If someone is hurt on a structure that was never inspected for structural soundness, the lack of approval becomes central evidence in a negligence claim against you. A deck that collapses because its footings were never certified is a very hard situation to defend.
Owner builders carry one more cost. They aren’t eligible for cover under the Queensland Home Warranty Scheme, which only protects homeowners who contract with a licensed builder. If you built it yourself, you carry the full cost of any remediation needed for retrospective approval.6QBCC. About Owner Building
What To Do Now
If you already have an unapproved structure and no notice has arrived yet, the most useful step is to contact a private building certifier experienced in retrospective approvals. They can tell you what category the work falls into, whether retrospective approval is realistic, and what documentation and inspections will be needed. That initial consultation costs far less than the problems that compound if you wait for council to find the issue first.
If you’ve received a show cause or enforcement notice, respond within the deadline. Ignoring these notices is the fastest route to prosecution and compulsory demolition orders. Engaging a certifier and showing genuine progress toward compliance is normally enough for a council to pause enforcement while you work through the approval.