Expert Polyurethane Soil Injection Sydney

We provide expert polyurethane soil injection in Sydney to stabilise foundations fast and with minimal disruption. If your building shows settlement, we assess the ground and deliver engineered resin injection solutions that restore support and protect property value.

We are Underpinning Sydney — structural preservation specialists with 20+ years’ experience. We offer underpinning, resin injection, screw piling, wall crack repairs and subfloor ventilation.

Our approach is non‑invasive and suited to occupied homes. Small drill points allow targeted injection that expands to fill voids and re‑level slabs. Depths vary from about 0.8 m to 6.5 m depending on ground conditions and engineering input.

We give free, no‑obligation structural assessments, fixed‑price quotes and coordinate engineering reports. Call 1300 970 930 to speak to Chris, book a site inspection or email photos for a quick preliminary review.

Key Takeaways

We deliver engineered, low‑disruption solutions to stabilise foundations.
Targeted resin injection strengthens the ground and re‑levels settled floors.
Services include underpinning, resin injection and screw piling for varied ground types.
Free assessments, fixed‑price quotes and council‑compliant reports give cost certainty.
20+ years’ experience means clear guidance and durable outcomes for your property.

Underpinning Sydney: polyurethane resin experts preserving Sydney homes

With decades of on‑site experience, we assess buildings and recommend only the underpinning your property truly needs.

Underpinning restores stability by transferring load to stronger strata or by improving the ground in place. Causes include erosion, water leaks, large trees, drought and poorly compacted fill.

Our licensed and insured team scopes each job with engineering input and clear method statements. We offer resin injection, concrete underpinning and screw piling, plus wall crack repair and council‑compliant reports.

We investigate drainage and water around the site so we fix root causes, not only symptoms. Typical signs are subsidence, cracks in masonry and plaster, sticking doors and uneven floors.

We select the right method for your building, not the easiest to sell.
Fixed‑price proposals with inclusions, exclusions and program.
Council documentation and structural certification coordinated for you.

Book an assessment on 1300 970 930 and get an experienced team on your property fast.

How polyurethane resin injection strengthens ground and foundations

We use a controlled expanding product to densify the ground and restore safe load paths beneath foundations.

Expanding mechanism: densification, bearing capacity and re-levelling

The expanding polyurethane resin compacts surrounding material as it reacts. This increases local stiffness and improves bearing capacity beneath footings.

Controlled fills reduce settlement risk and can lift slabs back towards level with measured, incremental lifts. Real‑time monitoring keeps movement within engineering tolerances.

Targeted depths for varying conditions and voids

We set depths to match the subsurface profile and voiding. Typical ranges are roughly 0.8 m to 6.5 m depending on strata and site constraints.

On confined sites we work through small drill points and use compact plant. The method focuses improvement only where the structure needs it.

Engineering validation and compliant outcomes

Designs begin with geotechnical data and target capacity gains.
Pre‑ and post‑works CPT or DCP testing verifies strength increases.
We keep QA records, photos and test results for certification and compliance.

The result is a documented, engineered improvement to foundations that reduces subsidence and restores long‑term support.

polyurethane soil injection sydney: when you need it and the issues it solves

If you spot new cracks or sinking slabs, it’s time to get a qualified assessment without delay. Early action limits further loss and protects your property.

Typical warning signs

Horizontal or stair‑stepped cracks in brickwork and plaster are common early signs. You may also see sloping floors, sticking doors or gaps at skirtings.

Sunken concrete, ponding on slabs and movement in revetment walls point to ground loss beneath the footing.

How we address subsidence, voids and moisture-related loss

We stabilise the ground beneath affected areas with precise, targeted resin at engineered depths. The work uses small drill points and quick reinstatement so disruption is minimal.

Call us if you see new or widening cracks around a wall or opening.
Unlevel floors, ponding or gaps at skirtings indicate subsidence.
Sinking paths or patios often signal nearby ground loss.
Water leaks can wash fines and create voids that cause damage.
Book a free inspection for honest advice and a clear scope of repairs.

Warning sign	Immediate action	Expected outcome
Cracks in brickwork	Assess and monitor, then treat affected area	Reduced movement and repaired wall finishes
Sloping floors	Level checks and targeted ground improvement	Improved bearing and restored level
Sunken slabs or paths	Stabilise voids beneath the slab	Reinstated surface and reduced sinking
Revetment movement	Support improvement beneath retainers	Lowered risk of further displacement

We give free assessments and clear, council‑compliant advice. You’ll get a practical scope that targets root causes and the repairs your foundation needs.

Our engineered process: safe, compliant and minimally invasive for occupied properties

We follow a proven, engineered workflow to protect homes with minimal disruption. From first contact to final certification, we manage the job with clear steps and honest advice.

Free no‑obligation structural assessment and honest advice

We start with a free structural assessment and a fixed‑price scope for your job. You get plain advice with no upsell. If we don’t think work is needed, we’ll tell you.

Precision drilling, controlled resin injection, real‑time monitoring and reinstatement

Our team drills small, strategic holes in the area and fits discreet injection points. Controlled injection places product where engineers specify.

We monitor movement and pressure in real time. Many residential projects finish in hours, with level gains managed to tight tolerances.

Drill tiny holes and install ports with minimal mess.
Deliver resin through controlled injection and compact surrounding ground.
Relevel where required and seal holes with non‑shrink grout.

Council‑compliant methods, licensed delivery and engineering reports

We are fully licensed and insured. Our services include engineering design notes and structural engineering reports for council approval.

We keep QA records and documented result data so you have proof of work and long‑term protection for your foundations and property.

Call 1300 970 930 to speak to Chris, book a site visit, or email photos for rapid advice.

Choosing the right foundation repair: resin injection vs concrete underpinning vs screw piling

Different foundation fixes suit different problems; we match the fix to the facts. Our decision is driven by engineering, ground conditions, access and building loads. We explain options plainly and recommend what will perform long term, not what’s easiest to sell.

Method strengths: speed, access, load transfer and long‑term performance

Resin injection is fast and low impact. It compresses and fills voids to improve bearing capacity and can be done through small ports where access is tight.

Concrete underpinning extends footings to deeper strata. It gives predictable capacity for heavy loads and is a permanent structural solution.

Screw piling transfers load to competent layers. It also allows precise jacking to close existing cracks and gaps while delivering high capacity.

Matching the method to ground, loads and constraints

We consider soil conditions, groundwater, load paths and access when selecting a method.
Bearing capacity targets and settlement criteria guide design and product choice.
Water, erosion or drought effects are managed in the design to control movement.
We model strength gains and verify results with on‑site testing where required.

You’ll receive a clear comparison of solutions, program and lifecycle considerations. For an engineering‑led recommendation on underpinning and foundation repair, see our guide on what is underpinning.

Solution	Strength	Best where
Resin injection	Fast, low impact	Tight access, voids, light‑to‑moderate loads
Concrete underpinning	High, predictable capacity	Heavy loads, need for permanent extension
Screw piling	High capacity, jacking possible	Deep competent layers, access for plant

Transparent pricing and what to expect on your Sydney project

You’ll receive a fixed‑price proposal that spells out inclusions, exclusions and the program for your project. We show what is covered and what is not so there are no surprises on the day.

Fixed-price quotes, minimal disruption, and what’s included

We offer a free site assessment that reviews your property, drainage and any visible damage. This visit informs a clear scope and fixed quote.

Scope may include resin work, minor concrete reinstatement and post‑works checks of floors. Small holes are sealed with non‑shrink grout on completion.

We list inclusions, exclusions and a program for the job.
We confirm any services isolation needs and how we protect your building.
Many residential projects finish within hours, with minimal disruption to your area and routine.
Testing may include DCP where appropriate and we record benchmarks for ground and foundation performance.
We can coordinate engineering certification so your records are complete and compliant.

Our experience ensures clients get clear communication, safe delivery and dependable outcomes. You will know when works, testing and benchmarks occur, and what water management or access preparations we need.

What we provide	Why it matters	Typical outcome
Fixed‑price quote with program	Cost certainty before work starts	Clear expectations and no surprise invoices
Site assessment covering property and drainage	Targets root causes and visible damage	Appropriate, cost‑effective repairs
Coordination of engineering reports	Ensures compliance and council records	Complete certification and peace of mind
Sealing and reinstatement	Protects finishes and restores surfaces	Minimal disruption and tidy completion

Phone 1300 970 930 to speak to Chris, or email photos for a fast, free preliminary. We’ll explain the quote, the timeline and the benchmarks we aim to meet.

Conclusion

For fast, documented results, rely on experienced specialists who validate gains with geotechnical testing.

We protect your foundation and foundations with engineered underpinning and ground improvement that lasts. Our team brings 20+ years’ experience delivering certified foundation repair across houses and other structures.

Work is licensed, insured and council‑compliant. We use CPT and DCP testing to confirm increased bearing capacity beneath your structure. That reduces subsidence, sinking and further damage in the area.

Expect clear advice, fixed pricing and a documented result you can rely on. Learn more about method choice in our resin vs concrete underpinning guide.

Call 1300 970 930 to speak to Chris, book an inspection, or email photos for a free preliminary assessment.

FAQ

What is resin injection and how does it stabilise foundations?

Resin injection is a chemical grouting method where a two-part expanding resin is delivered beneath and around foundations. The resin expands to fill voids, compact loose ground and transfer loads back into firm strata. This process increases bearing capacity and can re‑level sinking slabs and floors with minimal excavation.

How do you decide which depths and injection pattern to use?

We base injection depth and pattern on an engineering assessment. Geotechnical testing such as CPT and DCP informs us of soil profile and bearing layers. We then design targeted ports and staged injections to treat voids and weak zones while ensuring controlled expansion and load transfer.

What signs indicate I need this service for my home?

Typical warning signs include new or widening wall cracks, sloping or uneven floors, doors and windows that stick, visible slab settlement or movement in revetments. If you notice these, we recommend a prompt inspection to prevent further damage and loss of property value.

Is the process safe for occupied homes and indoor spaces?

Yes. Our method is minimally invasive and suitable for occupied properties. We use precision drilling, complete injections with real‑time monitoring, and reinstate finishes. Work is planned to reduce dust, noise and disruption, and all materials meet safety standards.

How long do results last and will the problem return?

When installed to engineering specifications, resin repairs provide a permanent stabilisation solution. The resin chemically cures to a durable, water‑resistant mass that prevents ongoing settlement. We also supply structural engineering reports and long‑term warranties where applicable.

How does resin injection compare with concrete underpinning or screw piling?

Each method has merits. Resin injection is faster, less disruptive and ideal where access is limited. Underpinning and screw piles may suit very deep repairs or where large load transfers are required. We assess soil type, building loads and site constraints to recommend the most suitable option.

Do you provide a free assessment and written quote?

We offer a no‑obligation structural assessment and transparent, fixed‑price quotes. The scope outlines what’s included, such as geotechnical testing, engineering designs, injection works and reinstatement, so you know what to expect before work begins.

Will council approval or engineering certification be required?

Some jobs require council notification or approval and a structural engineering sign‑off. We coordinate with engineers and manage compliance, ensuring licensed installation and documentation to meet local regulations and insurer expectations.

Can groundwater or moisture affect the repair?

Moisture can influence resin selection and injection strategy. We assess site conditions and choose formulations that perform in damp environments. Where needed, we combine drainage or waterproofing measures to protect long‑term performance.

How quickly can you stabilise a sinking slab or failing footing?

Many projects are completed within a day or a few days depending on size and complexity. Small slab lifts may be stabilised and re‑levelled on the same visit. We provide a timeline in the quote based on site inspection and testing.

What experience and guarantees do you offer?

Our team has years of experience restoring buildings across Sydney’s diverse soil types. We work with licensed installers and structural engineers, use proven product brands, and provide warranty terms and documentation with every job to give you confidence in the result.

Will repairs affect my landscaping or concrete finishes?

We plan works to minimise damage. In most cases we use small‑diameter access points and reinstate concrete, paving and landscaping after injection. Where larger access is required, we include reinstatement in the fixed quote to return your property to its prior condition.