Two engineers in hard hats reviewing plans on site

Renovation Structural EngineeringEngineering for Home Renovations

Structural engineering for load-bearing wall removals, new openings, structural alterations, and existing structure assessment — designed to make your renovation safe, compliant, and buildable.

RENOVATION.

Renovation Engineering

Every structural alteration requires an engineer who understands what is already there

Renovating an existing home is structurally more complex than building a new one. The existing structure carries loads in ways that may not be obvious, and any alteration — removing a wall, widening a doorway, adding a bathroom above a void, or opening up a ceiling — must be assessed in the context of the full load path from roof to footings. Errors in this assessment lead to structural movement, cracking, and in extreme cases, collapse.

At IA Engineering, we specialise in structural assessment of existing residential buildings before and during renovation. We identify which walls are load-bearing, trace the load path through the existing framing, and design practical solutions that allow the renovation to proceed safely — including transfer beams, temporary propping strategies, connection details, and strengthening of the elements that remain.

Our renovation engineering services are used by homeowners, builders, architects, and building certifiers across Greater Sydney and NSW. We provide engineering certificates accepted by private certifiers and councils, and we communicate clearly about what can be done structurally within the existing building and what the constraints are.

A renovation mid-build — existing framing opened up, transfer beams in place, and the load path carried through to the footings.

Two-storey timber wall and roof framing exposed during residential construction
Structural Alterations

Assess first. Design second. Build safely.

We assess the existing structure of your home before recommending any alteration — so the engineering solution we design is based on what the building actually is, not what the drawings say it should be.

  • Load-bearing wall removal and transfer beams
  • New door and window openings
  • Structural alterations to existing framing
  • Pre-renovation structural assessment

Load-Bearing Walls

Not every wall that looks structural is — and not every wall that looks cosmetic isn't.

Determining whether a wall is load-bearing requires an assessment of the full structural system — the roof framing above, the floor joists, the walls below, and how loads are transferred to the footings. In older Australian homes, this can be particularly complex: framing methods have changed over decades, and walls that appear non-structural may be carrying significant loads.

Our engineers conduct a thorough assessment of the existing framing — reviewing available drawings, inspecting accessible roof and sub-floor spaces, and tracing the load path — before advising on the structural implications of any proposed removal. Where a wall is confirmed as load-bearing, we design a transfer beam or frame to carry the loads that the wall previously supported, specifying the exact member size, end bearing conditions, and connection details.

For wall removals that require temporary propping during construction, we provide a propping strategy that the builder can follow — so the loads are supported safely throughout the construction process, not just after the beam is installed. This protects both the structure and the people working in it.

Common renovation engineering scopes

  • Load-bearing wall removalFull assessment, transfer beam design, temporary propping strategy, and engineering certificate for the removal of internal load-bearing walls.
  • New door and window openingsStructural lintel design for new or widened openings in external and internal walls — including brick veneer, cavity brick, and lightweight frame construction.
  • Ceiling height changesStructural assessment and design for raising or removing ceilings, including changes to ceiling joist arrangements and impact on roof structure.
  • Bathroom & kitchen additionsStructural assessment of floors for new wet area loads, water tank loads, and reconfigured kitchen layouts on suspended timber or concrete floors.
  • Deck and alfresco additionsStructural design for new decks, alfresco areas, pergolas, and outdoor structures connected to the existing home.
  • Pre-renovation structural assessmentIndependent structural assessment of the existing home before renovation to identify constraints, hidden conditions, and structural implications of the proposed works.

Our Scope

Types of renovation work we engineer

Our renovation structural team works across the full range of residential alteration types — from single wall removals to whole-home reconfiguration projects across brick veneer, cavity brick, lightweight frame, and concrete construction.

Open-Plan Conversions

Removing one or more internal walls to create an open-plan kitchen, dining, and living space is the most common renovation structural scope we encounter. We assess the walls proposed for removal, design the required transfer elements — steel beams, LVL frames, or portal frames — and provide a complete engineering package including temporary propping requirements and certified drawings for the certifier.

New Openings in Existing Walls

Creating new doorways, widening existing ones, or adding large windows to existing walls requires structural lintels or beams sized for the full tributary load above. We assess the existing wall construction, design the appropriate lintel or beam, and specify the end bearing and connection requirements — for brick veneer, double-brick, and lightweight frame homes.

Structural Alterations to Existing Framing

Notching, cutting, or modifying existing structural timber or steel members during a renovation without proper assessment can create structural deficiencies that are not immediately visible. We advise on the structural implications of proposed framing modifications and design repair or strengthening solutions where the existing framing has been compromised.

Pre-Renovation Structural Assessments

Before committing to a renovation design, some owners and architects want an independent structural assessment of the existing home — to understand constraints, hidden conditions, and the structural implications of what is proposed. We provide written assessment reports that give the design team a clear basis for the renovation brief and the builder a realistic understanding of the structural conditions they will encounter on site.

“The most dangerous renovation is one where someone removed a load-bearing wall and called it cosmetic. Engineering tells you what the building is actually doing — not what it looks like.”

IA Engineering Design Team
300+
Renovations Engineered
AS 1684
Timber Framing Standard
All NSW
Councils & LGAs
RPE
Certified Every Package

The Engineering

How we assess what is already there

Renovation structural engineering begins with understanding the existing building — its construction era, materials, framing method, and the load paths embedded in its current configuration. We review all available documentation and conduct a site inspection to verify existing conditions. In older homes, construction rarely matches what the drawings show, and a site inspection is essential before any structural work is designed.

Once the existing structure is understood, we assess the proposed renovation against the structural constraints and design solutions that are appropriate for the actual conditions. For wall removals, this means sizing the transfer beam for the real tributary load — accounting for the roof type, floor spans, and wall height — and specifying bearing conditions at each end that the builder can verify during construction.

Our documentation covers the full scope of the renovation alteration — structural drawings, engineering certificates, and propping strategies where required. We coordinate with the building certifier to address any specific engineering requirements attached to the development consent or complying development certificate.

Renovation structural engineering drawings and transfer beam details

Standards & Compliance

Every renovation engineering package certified by Registered Professional Engineers

All structural designs issued by IA Engineering carry the signature and certification of a Registered Professional Engineer (RPE) in New South Wales. For renovation work, this certification covers the structural alterations, the transfer elements designed, and the assessment of the existing structure — providing the certifier with the independent professional opinion required under NSW building legislation.

AS 1684 Timber FramingAS 4600 Cold-Formed SteelAS 3600 Concrete StructuresAS/NZS 1170 Structural ActionsAS 3700 Masonry StructuresNCC / BCA Compliant

Our Approach

How we work with you

Renovation projects move quickly, and our engagement process is designed to match. We review your architectural plans and the available information about the existing home, then arrange a site inspection where conditions need to be verified before the structural scope can be finalised. We issue a clear scope and fee proposal before any engineering work begins.

For fast-moving renovation projects where the builder needs structural sign-off urgently, we prioritise turnaround and communicate clearly about what is achievable and when. If a proposed alteration is structurally problematic, we tell the client early — with a clear explanation and alternative options, not just a refusal.

Once drawings are issued, we are available for builder RFIs throughout construction. For hold-point inspections required by the certifier — typically before a beam is boxed in or a ceiling is closed up — we attend site promptly and issue certificates without holding up the build schedule.

Assess the Structure. Design the Alteration. Build with Confidence.

Renovating and need structural engineering?

From load-bearing wall removals to full-home structural reconfiguration, our team provides renovation engineering packages that protect your home and certify your alterations for compliance.

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1300 911 671