Foundation Stabilisation Experts

Underpinning Services

Stabilise and strengthen your home’s existing foundations by extending them to a
deeper, more stable soil layer. The definitive solution for sinking, shifting, and
cracking homes on Melbourne’s reactive soils.

Get Free Assessment
1300 296 939

800+ Homes Underpinned

3–10 Days Typical Duration

25-Year Structural Guarantee

Free Structural Assessment

What is Underpinning?

Underpinning is the process of strengthening and stabilising an existing foundation by extending it deeper into the earth, or by widening its base to distribute the load more effectively. Unlike reblocking (which replaces stumps under elevated timber homes), underpinning is used for homes built on concrete slab or strip footings — particularly brick, brick veneer, and double-brick homes.

Melbourne’s notorious reactive clay soils expand and contract dramatically with changes in moisture. Over time, this constant movement causes slab heave, slab subsidence, and footing failure. Underpinning anchors your home to stable soil or bedrock far below the surface, eliminating the effects of surface soil movement permanently.

Signs You Need Underpinning

Progressive cracking in brick or masonry — Diagonal step cracks in brickwork, especially widening cracks, indicate significant foundation movement that won’t stop on its own.

Sinking or settling foundation — If sections of your home appear to have dropped or sunk, the soil beneath the footings is failing to support the weight.

Cracks that reappear after repair — If you’ve had cracks patched but they keep coming back, it means the underlying movement hasn’t been addressed.

Separating chimney or extension — A chimney, porch, or extension pulling away from the main structure is a serious sign of differential foundation movement.

Cracked or lifting concrete slab — Visible cracks in your slab floor, or tiles lifting and cracking, often indicate slab heave from reactive soil below.

Nearby excavation or tree removal — Excavation next door or removal of large trees can destabilise the soil supporting your foundations and require underpinning.

Did You Know?
Melbourne’s reactive clay soil shrinks and swells dramatically with seasonal moisture changes — putting enormous stress on timber stumps. This makes reblocking far more common in Melbourne than most other Australian cities.

Our Underpinning Process

We select the most appropriate underpinning method based on your soil type, foundation depth, home structure, and budget. Every method is engineering-approved and compliant with Australian building standards.

Structural Assessment
Our engineer visits your property, inspects all cracks and movement, analyses your soil type, and determines the cause and extent of foundation failure.

Engineering Design
We prepare a detailed engineering solution specific to your home. This includes method selection, pier placement, load calculations, and a schedule of works.

Permit Approvals
We manage all building permit applications and submit engineering documentation to council. You don’t need to deal with any of the paperwork.

Underpinning Works
Our experienced team carries out the underpinning works methodically, section by section, ensuring your home remains safe and stable throughout the entire process.

Inspection & Certification
A building inspector certifies the completed works. You receive a Certificate of Compliance as proof that all work meets Victorian building regulations.

Benefits of Underpinning

Permanently stops foundation movement

Works on brick & concrete slab homes

Certified and council-approved

25-year structural guarantee

Prevents new cracking from forming

Engineering-backed solutions

Increases home safety and value

You can usually stay in your home

Underpinning FAQs

Get a Free Structural Assessment

Concerned about cracks or foundation movement? Our expert will assess your home and give you honest, clear advice.

Book Free Assessment
1300 296 939

All Services

Reblocking

Underpinning

Foundation Repairs

Consultation and Advice

Why Choose VicWide?

Structural engineers on every job

Council-approved methods

Certificate of compliance provided

25-year structural warranty

Fully insured for your protection

★★★★★

“After getting quotes from three companies, VicWide was the only one who actually crawled under the house and showed me exactly what was wrong. Their honesty and expertise saved me thousands, and the quality of work was outstanding.”

Sarah M., Richmond

RELATED SERVICES

You Might Also Need

Reblocking

For elevated timber homes with failing stumps. The most common foundation fix in older Melbourne suburbs.

Learn More

Foundation Repairs

Targeted repairs for specific foundation problems — often used after underpinning to address residual cracking or
damage.

Learn More

Consultation & Advice

Not sure which solution is right for you? Our expert assessment will give you a clear, honest recommendation.

Learn More

Stop Foundation Movement 
For Good

Don’t let cracking walls and sinking foundations put your home at risk.
Our expert underpinning team is ready to assess your property and deliver a permanent, engineered solution.

Book Free Assessment
1300 296 939

Free Assessment

Engineering-Backed

25-Year Warranty