Planning Structural Alterations in Sydney? Here’s What You Need to Check Before You Start

Structural alterations involve changes to the load-bearing parts of a home. While cosmetic renovations affect how a property looks, structural work can affect how the building is supported and performs.  

Removing walls, extending rooms, modifying roof structures, or changing structural supports may require engineering, approval, certification, and inspections before work begins.  

If you are planning structural work on a single dwelling home in Sydney, the safest step is to check the certification requirements before demolition or construction begins. 

Structural Alterations Include Any Work That Changes How the Home Is Supported

A structural alteration is work that changes, removes, supports, or adds to the main load-bearing parts of a home. This can include:

• Removing or altering load-bearing walls
• Adding a second storey
• Extending the building footprint
• Changing roof framing
• Modifying beams, columns, footings, slabs, or foundations
• Enlarging windows or doors where structural supports are affected

Many homeowners assume a small change will not require approval because it does not look like a major renovation. That assumption can be risky. A single wall opening, roof change, or new structural connection may still require engineering, approval, and inspection.

The practical question is not whether the work looks small, but whether it affects the structure, safety, or approved use of the home.

Structural Changes Need More Than a Builder’s Advice 

A builder can advise on construction methods, sequencing, and practical building issues. However, a builder’s advice doesn’t replace approval, certification, engineering, or compliance checking. 

Structural work must meet the relevant building standards, approval conditions, and documentation requirements before it can be accepted. In NSW, building work must also be assessed against the applicable legal and technical requirements, including the National Construction Code.

Unapproved structural work can create problems beyond the building site. It may affect insurance, future sale contracts, refinancing, and the ability to prove that the work was properly assessed and approved.

The safest approach is to separate construction advice from certification advice so each role is handled appropriately.  

You May Need Approval Before Structural Alterations Begin

Most structural work will need some form of approval before construction starts, but the exact pathway depends on the scope of work and the property. 

Some minor works may qualify as exempt development if all applicable standards are met. Other projects may need a Complying Development Certificate, Development Application, Construction Certificate, or another approval pathway. NSW Planning explains that exempt development does not need planning or building approval only when all required development standards are met.

Because approval requirements vary between projects, homeowners should avoid relying on assumptions or informal advice before signing contracts or starting demolition.

Checking the approval requirements early is usually simpler and less expensive than trying to resolve undocumented structural work after construction has commenced.

7 Common Mistakes Homeowners Make 

Many structural alteration issues can be avoided with proper planning before work begins. Common mistakes include:

• Assuming small structural changes do not require approval: Even relatively minor works can require approval if they affect load-bearing elements, structural integrity, or the approved use of the home.
• Starting demolition before confirming certification requirements: Beginning work too early can create delays if approvals, engineering details, or supporting documentation have not been prepared.
• Relying solely on builder advice for approval decisions: A builder can advise on construction methods, but approval and certification requirements should be confirmed separately.
• Failing to obtain engineering documentation: Structural alterations often require engineering details to demonstrate the proposed work can be carried out safely.
• Removing walls before approvals have been issued: A wall opening may appear straightforward, but structural changes should be properly assessed before work begins.
• Making changes that differ from approved plans: Alterations made during construction can create compliance issues if they do not match the approved design.
• Missing required inspections during construction: Some inspections must occur before work is covered. Missing these inspections can create delays and additional costs later in the project.

Many of these issues only become apparent later when inspections, refinancing, insurance claims, or property sales are involved.

Starting structural work without the required approval can create problems beyond the construction stage. Work may need to stop while the issue is investigated, completed areas may need to be opened for inspection, and additional engineering evidence may be required after the fact.

Having the Right Documents Early Makes Certification Easier to Manage 

The documents needed for structural alterations vary depending on the project. As a general guide, homeowners should gather:

• Existing house plans (if available)
• Proposed renovation drawings
• Engineering details or structural plans
• Site information
• Builder details
• Existing approval documents
• Previous approval records or renovation documents

Clear documentation helps a certifier understand the scope of work, identify potential issues early, and reduce delays caused by missing information.

Preparing these documents before construction begins often results in a smoother approval process.

What Does a Private Certifier Do? 

A private certifier helps homeowners understand the approval and certification requirements that may apply to a project before construction begins.

Depending on the scope of work, a certifier may:

• Review plans and supporting documentation
• Identify the approval pathway that may apply
• Confirm what information is needed for assessment
• Assess compliance with relevant requirements
• Carry out required inspections where appointed
• Issue certificates when legal requirements have been met

A certifier does not design the renovation or supervise the builder. The builder remains responsible for carrying out the work in accordance with the approved plans, while the owner remains responsible for meeting approval conditions.

The certifier's role is to assess compliance, request supporting evidence where required, and help ensure the certification process is followed correctly.

For homeowners, this guidance can help reduce confusion and identify potential issues before they become costly delays later in the project.

Frequently Asked Questions

Can I remove a load-bearing wall during a renovation?

Removing a load-bearing wall is a structural alteration and should not be undertaken without first obtaining the appropriate engineering advice and confirming any approval requirements that may apply.

Do I need engineering plans for structural alterations?

Many structural alterations require engineering details to demonstrate how the proposed work will be supported and constructed safely. The exact requirements will depend on the project.

Will structural alterations affect my home's value?

Well-planned structural alterations can improve the functionality and appeal of a home. However, buyers and lenders may also want evidence that the work was properly approved, certified, and documented.

Can structural alterations be carried out in older homes?

Yes. However, older homes can present additional considerations such as ageing materials, previous renovations, non-compliant work, or structural conditions that may need further investigation before work begins.

How early should I speak with a certifier about structural alterations?

It's generally best to seek advice before signing building contracts, commencing demolition, or starting construction. Identifying approval and certification requirements early can help avoid delays and unexpected issues later in the project.

Planning Structural Alterations?

Before removing walls, changing roof structures, or carrying out other structural work, it's worth confirming the approval and certification requirements that apply to your project.

If you're unsure where to start, contact Eastside Certifiers for guidance on your structural alteration project.