Unapproved Structures in Australia: What Homeowners Need to Know About Insurance Risks

Unapproved structures are a common issue across New South Wales, particularly for older homes, renovated properties, and investment dwellings. Many property owners are unaware that a shed, extension, pergola, or even a granny flat on their land was never formally approved by the local council’s building department. An unapproved structure refers to any building, extension, or modification on a property that has not received the necessary approval from the local council or planning authority.

In some cases, the work may have been completed decades ago by a previous owner, while in others it may involve recent renovations or alterations carried out without the correct planning approval or necessary permits. Owning or purchasing an illegal structure can expose you to legal, safety, and financial risks, making compliance and proper approval processes essential.

In NSW, building and planning laws are enforced at a local council level but governed by state legislation, including the State Environmental Planning Policy and local council regulations. This means the consequences of having an unapproved structure can be serious and may include council fines, orders to modify or demolish the structure, difficulties selling the property, and limitations on insurance coverage. These significant risks can apply even if the structure appears safe and well-built and meets safety standards. Common examples of structures built without council approval include decks, patios, garages, extensions, sheds, and internal structural changes.

Understanding what qualifies as an unapproved structure is essential for homeowners, landlords, buyers and investors. This includes identifying buildings or alterations that lack council or certifier approval, how councils detect them, and the available options to resolve compliance issues. Acting early can reduce legal risk, protect insurance cover and avoid costly disputes during property transactions.

What Is Considered an Unapproved Structure in NSW?

An unapproved structure in NSW is any building or structural work that has been constructed without the required planning approval, development approval, or that does not comply with the approval that was originally granted. This can include work completed without development consent, complying development approval, or where conditions attached to an approval were not followed, thus constituting illegal works or unauthorised work.

Approval requirements depend on the type, size, and location of the structure, as well as the zoning laws and local regulations governing the land. Even relatively small works can require council approval if they exceed exempt development thresholds or fail to meet setback, height, or building regulations. A structure may also be considered unapproved if it was altered after approval was issued, such as extending a deck or enclosing a carport without further consent or required modifications.

Importantly, a structure does not become approved simply because it has existed for a long time. In NSW, there is no automatic time limit that legalises unauthorised building work. Councils retain the power to take enforcement action many years after construction, particularly if the structure presents safety, environmental, or amenity concerns or involves non-compliant structures.

Common Examples of Unapproved Structures

Common examples include sheds, garages, and workshops built without consent, pergolas and decks that exceed exempt development limits, and home extensions, renovations, or swimming pools completed without council approval or proper permits.

Granny flats and secondary dwellings are also frequently affected, particularly where they were built without a complying development certificate or building information certificate. Carports, fences, and retaining walls may also be unapproved if they do not meet height, boundary, or location requirements or fail to comply with local building codes.

Why Structures End Up Being Unapproved

There are several reasons why structures become unapproved in NSW, and in many cases, it is not due to deliberate non-compliance. One of the most common causes is a misunderstanding of what qualifies as exempt development under local council regulations. Property owners often assume that small structures or minor renovations do not require approval, only to later discover that size, location, or design rules were exceeded. It is crucial for property owners to obtain approval for structures like granny flats or extensions to ensure compliance with local council requirements and avoid penalties.

Unapproved structures also frequently arise when work is carried out by a previous owner. Prospective buyers may not realise that a garage, extension, or pergola was never formally approved, particularly if the structure appears permanent and well constructed. Unless approval documentation is checked during due diligence or a risk assessment is conducted, these issues can remain hidden until council records are reviewed or a problem arises.

DIY renovations are another major contributor. Owners may complete alterations themselves without seeking professional advice or obtaining proper certification, unaware that internal changes, structural works, or changes to use can still require approval and compliance certificates. In other cases, approval may have been granted originally, but the completed work does not match the approved plans, which can also result in non-compliance.

NSW Planning Laws That Apply to Unapproved Structures

Unapproved structures in NSW are regulated under a state-based planning framework administered by local councils. The local council’s building department is responsible for assessing and approving building applications to ensure compliance with safety and planning standards. The primary legislation governing development is the Environmental Planning and Assessment Act 1979, which sets out how building work must be approved and enforced across the state, including the approval process and necessary approvals. Local environmental plans and development control plans then apply council-specific rules, including zoning laws and local building codes.

Most building work in NSW falls into one of three approval pathways. Development consent applies to larger or more complex projects and requires a development application to council, involving submitting plans and required documentation. Complying development applies to certain low-risk works that meet strict criteria and can be approved more quickly through a complying development certificate. Exempt development covers minor works that meet specific standards and do not require formal approval, provided all criteria are satisfied.

A structure becomes unapproved when it does not fit within one of these pathways or when approval conditions are breached. Councils have broad enforcement powers that apply to both recent and historical building work and illegal structures.

Building Information and Certificates for Unapproved Structures

For property owners in New South Wales, obtaining a Building Information Certificate (BIC) can be a crucial step in addressing unapproved structures. A BIC is issued by the local council and serves as formal recognition that a structure exists on the property, offering protection from immediate demolition orders. To secure a BIC, property owners must involve submitting plans and supporting documentation to the local council’s building department, demonstrating that the structure complies with current local building codes and environmental planning requirements.

The process may require property owners to undertake necessary repairs or modifications to bring the structure up to safety standards. This ensures that the building does not pose risks to occupants or the surrounding environment. By obtaining a BIC, property owners can reduce potential risks and financial consequences associated with unapproved structures, such as enforcement action or loss of property value. In South Wales, a BIC can also provide peace of mind during property transactions, as it assures prospective buyers and lenders that the structure has been formally acknowledged by the council, helping to protect the long-term value and compliance status of the property.

What Happens If Council Discovers an Unapproved Structure?

When the local council becomes aware of a potential unapproved structure, it will usually begin an investigation. This may be triggered by a neighbour’s complaint, an inspection, a development application for other works, or a review of council records during a property sale. Council officers may inspect the property and compare the structure against approved plans, compliance certificates, and planning controls.

If the structure is found to be unauthorised, the local council may issue a notice to comply outlining steps the property owner must take within a specified timeframe. Where construction is ongoing, a stop-work order may also be issued. If the structure cannot be made compliant, the council may require it to be modified, repaired, or removed.

Councils are not required to overlook non-compliance simply because a structure has existed for many years. Failure to respond to notices can result in council fines, court action, legal assistance being necessary, and increased costs involved.

Penalties and Risks of Unapproved Structures in NSW

Unapproved structures can expose property owners to financial and legal risks. Councils can issue fines for unauthorised building work, with penalties increasing if breaches continue. Serious matters may be escalated to court, leading to higher costs and enforcement orders. Penalties can include on-the-spot fines of up to $3,000 and court-imposed penalties reaching up to $5 million.

Property transactions are also affected. Buyers, lenders, and conveyancers often request evidence of approvals, and missing documentation can delay or prevent a sale. Valuers may exclude unapproved structures from their assessment, which can reduce borrowing capacity and negatively affect property value.

Insurance risk is another key concern. Building and landlord insurance policies may limit or exclude insurance coverage for unapproved structures, particularly where they contribute to loss, liability, or insurance complications. If an unapproved structure causes injury or damage, the owner may face personal exposure if insurance coverage is restricted or denied, leading to higher premiums or claim refusals.

 

Feature	Approved Structure	Unapproved Structure
Council Approval	Yes	No
Insurance Coverage	Typically included in standard policies	Often excluded or requires additional coverage
Legal Compliance	Meets local building codes and regulations	May violate zoning laws or building codes
Claim Processing	Generally straightforward and accepted by insurers	May face delays or denials due to non-compliance
Premium Rates	Standard rates based on property value and risk	May incur higher premiums or require specialised policies
Property Value Impact	Maintains or enhances property value	Potentially lowers property value due to legal risks
Resale Potential	Easier to sell with proper documentation	May complicate sale or require costly rectifications

 

Can You Get Retrospective Approval for an Unapproved Structure?

In some cases, retrospective approval may be possible. This involves applying to your local council after the structure has already been built and demonstrating that it meets current planning controls, building codes, and safety standards. Councils assess retrospective applications in the same way as standard development applications, requiring the submission of required documentation and compliance certificates.

Where development consent is not required but compliance is in question, a building certificate or building information certificate may be an option. A building information certificate can offer protection from demolition orders by the council for a defined period if the structure is safe and substantially compliant. Certificates are not automatic and often require inspections and supporting documentation by a private certifier.

Retrospective approval is less likely where a structure presents safety risks, impacts neighbours, or significantly breaches planning controls. In these cases, required modifications or removal may be necessary.

Options to Regularise Unapproved Building Work

Options may include lodging a retrospective development application, applying for a building certificate or building information certificate, modifying the structure to meet requirements, or removing non-compliant elements. Each option involves different costs, risks, and timeframes.

Seeking Professional Advice for Unapproved Structures

Navigating the complexities of unapproved structures in New South Wales can be challenging, which is why seeking professional advice is highly recommended. Engaging with experts such as architects, engineers, or lawyers can help property owners understand their obligations under local council regulations and zoning laws. These professionals can assess the property, identify potential risks, and outline the costs involved in rectifying unapproved structures.

Professional advice is invaluable when it comes to the approval process, as experts can guide property owners through obtaining necessary permits, development approval, and building certificates. This support helps ensure legal compliance and reduces the risk of council fines or enforcement action. In South Wales, property owners can also consult with private certifiers or the local council’s building department to clarify requirements and streamline the approval process. By investing in professional advice, property owners can make informed decisions, ensure compliance, and protect their property from costly legal and financial consequences.

Buying or Selling a Property With Unapproved Structures

Unapproved structures can complicate property transactions in NSW. Sellers must avoid misleading potential buyers about the approval status of buildings and improvements. Where approvals cannot be produced, buyers may renegotiate for a lower purchase price, delay settlement, or withdraw from the transaction.

A Building Information Certificate (BIC) can offer protection from demolition orders by the council for unapproved structures, providing reassurance to buyers and sellers during property transactions.

Prospective buyers also take on risk. Once a property is purchased, the new owner becomes responsible for addressing any compliance issues. Lenders may be reluctant to finance properties with unapproved works, particularly where the structure adds material value or involves non-compliant structures.

Conducting proper due diligence before buying or selling is essential to managing these potential risks and ensuring legal compliance. Title insurance may also provide protection for buyers against issues arising from unapproved works or council actions related to property approvals.

 

Feature	Approved Structure	Unapproved Structure
Claim Success Rate	High-claims are typically processed smoothly and accepted	Low-claims may be denied or disputed due to non-compliance
Legal Compliance	Fully compliant with local building codes and regulations	May violate zoning laws or building codes, risking fines or demolition orders
Impact on Property Value	Neutral or positive—maintains or enhances value	Negative—may lower value due to legal risks and potential demolition

 

Insurance Considerations for Unapproved Structures

Most insurance policies require disclosure of property conditions and compliance status. Where structures are unapproved, insurers may limit coverage, apply exclusions, or refuse to insure the structure altogether, causing insurance complications.

If a claim involves an unapproved structure, insurers may reduce or deny the claim, particularly if the non-compliance increases risk. This applies to damage claims and liability claims involving injury or property damage.

Landlords face additional exposure if tenants or visitors are injured due to an unapproved structure. Reviewing insurance policies and addressing compliance issues early helps protect against costly disputes and higher premiums.

Property Owner Responsibilities Regarding Unapproved Structures

As a property owner in New South Wales, it is your responsibility to ensure that all structures on your property comply with local building codes, environmental planning policies, and council regulations. Failing to obtain necessary approvals or proper permits for unapproved structures can expose you to significant risks, including council fines, costly rectification works, and potential legal issues. Non compliant structures can also impact your property value and limit insurance coverage, creating further financial exposure.

It is essential to disclose the existence of any unapproved structures to subsequent buyers, as undisclosed issues can complicate property transactions and lead to disputes. To avoid these problems, property owners should prioritize obtaining approval, securing proper certification, and conducting regular risk assessments to identify and address any compliance gaps. Taking proactive steps to ensure compliance not only protects your investment but also helps you avoid the significant risks and financial consequences associated with unapproved structures in South Wales.

Final Notes for Property Owners in NSW

Unapproved structures are more than a paperwork issue. They can affect property value, delay transactions, trigger council enforcement action, compromise insurance cover, and create significant risks. Even well-built structures can create risk if the correct approvals and proper permits were never obtained.

Property owners should not assume that age or prior ownership removes compliance obligations. Councils retain broad enforcement powers, and issues often surface during inspections or property transactions. Confirming approvals, seeking retrospective consent where appropriate, and obtaining professional advice, including legal assistance if needed, can help protect long-term financial and legal interests.