Residential Structural DesignEngineering for Australian Homes

Structural engineering for new homes, extensions, renovations, granny flats and dual occupancies across Sydney & NSW — from concept and structural design to drawings, certification and construction support.

Modern two-storey home with its structural wireframe drawn alongside
RESIDENTIAL.

Our Scope

Types of residential projects we engineer

Our residential structural team works across the full range of home-building and renovation project types across Greater Sydney and NSW — from straightforward single-storey homes to complex multi-dwelling developments on challenging sites.

New Home Construction

From the earliest stages of your project, we provide structural assessments, site inspections, engineering design, and comprehensive technical documentation. Every structural element is designed to Australian Standards and optimised for strength, safety, durability, and cost-efficiency. We work closely with architects, builders, and certifiers to ensure your design is not just structurally sound but submission-ready — supporting council and private certifier coordination throughout the approval process.

Extensions & Second Storey Additions

Structural engineering for ground-floor extensions, rear additions, side extensions, and second-storey builds. We assess the existing structure's capacity before adding any new loads, design the new framing system, and specify strengthening requirements for existing walls, beams, or footings. This includes transfer beams for wall removals and openings between old and new structure.

Granny Flats & Dual Occupancies

Secondary dwellings and dual-occupancy developments require the same engineering rigour as a full home. We design standalone granny flat structures — footings, wall frames, and roof structures — and provide engineering certificates for both CDC and DA pathways. For dual-occupancy developments, we handle both dwellings and shared boundary wall fire separation details.

Renovation & Structural Alterations

Wall removals, new openings, bathroom additions over voids, deck loadings, roof structure upgrades, solar and water tank installations — existing homes often need structural changes to support renovations, and each change requires proper load assessment. We survey the existing construction, trace the load path, and design practical solutions that work within the constraints of the existing building and your renovation budget.

Apartment & Unit Load-Bearing Wall Removal

Removing a wall in an apartment or unit can affect the building's structural system. We assess whether the wall is load-bearing and design the structural support required for safe removal or modification. Our engineering can include new beams and connections, structural drawings, calculations and certification for strata, certifier and construction requirements.

Need a structural design?

Already have plans?

Send us your architectural drawings, concept plans or existing plans and tell us what you're planning. We'll come back with the structural scope and a fee proposal.

Structural solutions from foundation to roof

What does a structural engineer design for your home?

We design the structural elements that keep your home safe, functional and built to last — from the ground beneath it to the roof above.

Cutaway sketch of a two-storey house with its structural elements labelled from footings to roof

Roof Framing

Structural design for timber and steel roof systems, including new loads from extensions or second storeys.

Beams & Columns

Design of steel, timber or concrete structural elements to support floors, walls and roof loads.

Load-Bearing Walls & Wall Removal

Assessment and design for new openings, wall removals and open-plan living.

Structural Connections

Engineering details for connections between structural elements to ensure strength, stability and compliance.

Floor Structures

Structural design for ground and suspended floors, including joists, bearers and structural flooring systems.

Retaining Structures

Structural design for retaining walls where required, including scenario-specific solutions for sloping sites.

Foundations & Footings

Design for stable and reliable foundations based on your site conditions, soil type and building requirements.

Concrete Slabs

Design of ground and suspended slabs for residential construction.

Our Approach

How does the structural design process work?

Good residential engineering is collaborative, not prescriptive. Every project follows the same five steps, from the first conversation to handover.

  1. 01Discuss

    Tell us about your home, your site and what you want to build. We confirm the scope and send a fee proposal before any work begins — no surprises.

  2. 02Review

    We review your architectural plans, survey and geotechnical report, and inspect the existing structure where the project calls for it.

  3. 03Design

    We trace the load path and design the structural system, talking through options with your architect and builder before anything is locked in.

  4. 04Document

    Structural drawings, calculations and certification are issued ready for council, CDC or private certifier approval.

  5. 05Support

    We answer builder and certifier queries and inspect key stages — footings, framing, pre-slab — issuing hold-point certificates where required.

Deliverables

What you receive

Clear and comprehensive engineering documentation to take your project from design through approval and construction.

Structural Drawings

Detailed structural drawings and construction details for the structural elements relevant to your project.

PlansSectionsDetailsMember SizesConnections

Engineering Calculations

Structural analysis and engineering calculations supporting the design in accordance with applicable Australian Standards.

LoadsStructural AnalysisDesign Calculations

Engineering Certification

Engineering documentation and certification required for the relevant stage of your project, where applicable.

CertificationCompliance DocumentationCertifier Support

Construction Support

Engineering assistance during construction where clarification, coordination or site input is required.

Builder SupportDesign ClarificationsSite Inspections
Get a quote

Practical engineering. Stronger homes.

Timber house frame model standing on residential structural drawings

Renovation & Modernisation

Modernise your home. Don't start over.

Building a brand-new home is a significant investment of time and money. But with strategic renovation and intelligent structural reconfiguration, you can create a modern, functional, and more spacious living environment at a fraction of the cost — whether you own a single-storey cottage, a double-storey family home, a townhouse, or an apartment.

Many older Australian homes were designed around enclosed, compartmentalised layouts that no longer suit how people live today. Through carefully engineered structural modifications — removing load-bearing walls, creating new openings, adding levels, or reconfiguring floor plans — outdated homes can be transformed into open, light-filled, and highly functional spaces that improve everyday life and increase market value.

Our team assesses the existing structure of your home, identifies what is structurally possible within your budget, and designs practical solutions that bring your vision to life without compromising safety or compliance. Renovation is a smart investment — and good engineering is what makes it safe.

What a structural renovation can achieve

  • Open-plan living spacesRemove one or more load-bearing walls to connect kitchen, dining, and living areas into a single, flowing space.
  • Better natural lightCreate new openings, widen existing ones, or raise ceiling heights to flood the home with daylight.
  • Additional rooms & storeysAdd a new bedroom, home office, or second storey — expanding your home's footprint or height without touching the footprint.
  • Seamless indoor-outdoor connectionOpen rear walls to create bi-fold transitions to outdoor entertaining areas, structurally supported and council-certified.
  • Solar, water tanks & roof loadsIntroduce rooftop solar arrays, rainwater tanks, or green roofs with structural assessment and load distribution engineering.
  • Increased property valueA well-planned structural renovation consistently delivers strong return on investment compared to equivalent new build costs.

Standards & Compliance

Every residential design 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. This is the standard required by NSW councils, private certifiers, and building code authorities for structural engineering certification — whether for a new home, a wall removal, or a retaining wall system.

AS 1684 Timber FramingAS 4600 Cold-Formed SteelAS 3600 Concrete StructuresAS/NZS 1170 Structural ActionsAS 4678 Earth-Retaining StructuresNCC / BCA Compliant
500+
Residential Projects
AS 1684
Timber Framing Standard
All NSW
Councils & LGAs
RPE
Certified Every Package

Need residential structural engineering?

From new homes to complex multi-dwelling sites and retaining wall systems, our team delivers residential structural engineering that council certifiers accept on first submission.