We stabilise and restore affected foundations fast and safely, offering clear solutions and fixed-price quotes to homeowners and property investors. Call 1300 970 930 to speak to Chris or book a site inspection for a free, no-obligation structural assessment.
We are a licensed company of structural preservation specialists with 20+ years’ experience. We deliver resin injection, concrete underpinning and screw piling services that address building movement and related problems.
We prioritise safety, compliance and permanent results. Our team uses targeted resin injection and controlled lift to consolidate soils, re-level slabs and complete most residential jobs within hours with minimal disruption.
We assess your home, explain options simply and coordinate engineering reports and certification so you stay compliant from start to finish. Email photos or call to arrange an inspection and a transparent fixed-price quote.
Key Takeaways
- Free site assessment and fixed-price quote to start.
- Licensed specialists with 20+ years’ experience.
- Resin injection and piled solutions with minimal disruption.
- We coordinate engineering reports and council compliance.
- Fast, single-day residential works where suitable.
- Call 1300 970 930 to speak to Chris or email photos for a quick review.
Trusted chemical underpinning and ground engineering for Sydney homes
We deliver trusted ground engineering services that preserve foundations and reassure homeowners. Our mission is to protect structures with safe, compliant and engineering‑led work across local suburbs.
Non‑invasive resin injection often lets you remain at home during works. Many residential re‑levelling jobs finish within hours or a single day, depending on soil and building conditions.
Advanced monitoring manages controlled lift and keeps outcomes stable. We tailor each plan to local soils, from reactive clay to sandy lenses.
- Minimal disruption: planned work to reduce time on site.
- Engineering mindset: certification and safety prioritised.
- Clear scope and fixed pricing: defined deliverables for clients.
- Full supervision: staged checks, documentation and council coordination where required.
To discuss your property and book a site inspection, book a site inspection with our company. We bring years of experience so you can make confident decisions about construction and repair.
Chemical underpinning Sydney
Focused polyurethane resin injections strengthen weak ground and lift settled building elements. This method uses small drill points to inject expanding resin beneath footings. The resin flows into fissures and voids, compacts loose soils and cures to form a stable, load-bearing mass.
When resin injection is appropriate
We recommend this solution for localised subsidence, sunken slabs, voids beneath slabs and uneven floors. It suits differential settlement and rocking slabs where a fast, low‑impact fix is needed.
Safety, compliance and certification
We are licensed and insured. An engineering assessment confirms suitability. We monitor lift with live readings and record as‑built data for certification and council needs.
Environmentally responsible resins
Chosen resins are non‑toxic and become inert after cure. Injection depths vary from about 800 mm to 6.5 m to reach the problem horizon. Work is low‑noise and many residential jobs finish within hours, letting you stay in your home.
- Guided injection densifies soils under footings.
- Controlled lift re‑levels sunken slabs.
- Small access points limit landscaping impact.
- We provide product details, monitoring and certification on completion.
Signs your foundation needs attention and common Sydney causes
Small changes inside your home can point to larger problems in the ground beneath it. Noticing symptoms early makes repair simpler and less costly.
Practical symptoms to look for
Settlement often shows as visible cracks in walls near corners or openings.
Jammed windows and doors indicate movement in frames and lintels. Sloping floor planes and gaps at skirtings are signs of uneven support below.
Common causes in our area
Reactive clay cycles between drought and soak and can cause subsidence. Water from leaking pipes or poor drainage softens soil and accelerates movement.
Tree roots draw moisture and reduce bearing capacity near footings. Nearby construction and vibration can create or enlarge voids beneath slabs and other buildings.
Why acting now matters
Early assessment limits progressive damage to slabs, walls and retaining structures. A prompt inspection gives a clear plan tailored to your area and house.
- Cracks in walls often align with settlement.
- Jammed windows and doors show frame movement.
- Local sinks in slabs can signal washout or consolidation.
To learn more about local risks and solutions, see our foundation failure in your area.
Selecting the right underpinning method for your property
The best foundation solution matches site conditions, building loads and access constraints.
Resin injection gives fast stabilisation and re‑levelling with minimal excavation. It suits sunken slabs and localised movement. Works often finish in a few hours and cause little disruption.
Concrete piers add permanent support where heavy masonry or point loads demand deeper intervention. This traditional option suits larger loads and where new piers are required.
Screw piling provides engineered deep support on soft or variable ground. It is ideal for filled sites and where vibration limits other construction methods.
We explain trade‑offs clearly. Cost, access and programme vary between solutions. We tailor designs to your building type, soil profile and target performance.
- We recommend resin when speed and low impact matter.
- Choose concrete for heavy loads and structural piers.
- Screw piles deliver deep, reliable support in soft ground.
- Independent engineers review and certify designs for your property and council.
Our expertise and coordination with engineers and councils mean you get a compliant, durable foundations strategy from a trusted company.
Our engineering‑led process for stable, long‑lasting results
Our engineered approach focuses on clear diagnosis, targeted repairs and verified outcomes for lasting stability. We promise honest assessments, no upselling and minimal disruption on every job.
Free no‑obligation assessment and clear diagnosis
We start with a free structural assessment. Our inspection explains the problems plainly and recommends only necessary work.
That means you get an honest plan, not extra work.
Targeted works with small drill points and controlled lift
We prepare by drilling small holes in affected zones. Then we inject polyurethane resin at targeted depths to compact the ground and lift slabs.
This controlled injection addresses local subsidence quickly. Most residential jobs finish within hours, keeping disruption low.
Verification, records and certification
We monitor levels live to manage outcomes and protect your foundation. Holes are sealed with non‑shrink grout on completion.
We supply as‑built records and coordinate certification so your project closes with clear documentation.
- Free assessment and straightforward diagnosis.
- Small drill points to protect finishes and landscaping.
- Controlled injection and live monitoring for safe lift.
- We select the right product and depth for local ground.
- We record as‑built data and help with certification on close.
- Clear communication during the getting job and tidy site handover.
| Stage | What we do | Typical outcome |
|---|---|---|
| Inspect | Free structural assessment and honest diagnosis | Clear scope, no upsell |
| Prepare | Drill small points and set monitoring | Low impact to finishes |
| Act | Targeted resin injection and controlled lift | Rapid re‑levelling of slabs |
| Verify | Live monitoring, seal holes, as‑built records | Certified results and tidy site |
Pricing, timelines and disruption
Transparent quotes and efficient scheduling keep disruption low while we restore your slab. We give fixed-price quotes after a free assessment so you know cost and time up front.
Clear fixed-price estimates
Many single-day resin projects sit between $5,000 and $15,000. We explain what is included and any allowance for concrete or patching.
That way you see expected results and limits before the job starts. We also outline any product warranties and workmanship guarantees you can expect.
Fast turnarounds with minimal disruption
Most residential projects finish in hours. Work is low-noise and non-invasive, so you can usually stay at home while we work.
- We protect access, finishes and services during the job.
- Resin cures quickly, restoring slab and floor use soon after completion.
- We plan around your schedule to keep interruption to a minimum.
- Documentation, certification and handover occur when the job is done.
- We remain available if you have questions after completion.
For a detailed cost guide and to book a free assessment, see our underpinning cost guide. We aim to deliver reliable services and clear outcomes for your house and ground works.
Beyond underpinning: integrated repairs and prevention
We combine foundation stabilisation with practical repairs so problems do not return. Our work protects finishes and reduces future disruption.
Wall crack repairs and re‑pointing
After the foundation is stabilised, we repair cracks and re‑point mortar to restore walls and prevent moisture ingress. This step protects internal and external finishes.
Subfloor ventilation and drainage upgrades
We design ventilation to reduce trapped moisture under homes. Upgraded surface and roof water management keeps water away from foundations and lowers recurrence risk.
Retaining wall support and stabilisation
On sloping sites, we provide engineered support to stabilise retaining structures. This reduces lateral loads and protects adjacent building elements.
Engineering reports and certification
We coordinate structural reports for compliance and insurance. Documentation after works ensures your property meets regulatory and insurer expectations.
- We sequence repairs after movement is arrested to protect finishes.
- Our solutions address causes, not just symptoms, for durable outcomes.
- We advise on maintenance to keep foundations stable over time.
| Service | What we do | Key benefit |
|---|---|---|
| Wall repairs | Crack stitching, re‑pointing and finish restoration | Restores appearance and prevents water ingress |
| Ventilation & drainage | Subfloor vents, French drains and roof runoff control | Reduces moisture, limits soil movement |
| Retaining support | Engineered bracing and batter repairs | Stabilises slopes and protects foundations |
| Reports & certification | Engineering assessments and compliance documentation | Meets council and insurer requirements |
Why Underpinning Sydney: assurance built on experience
We pair engineering rigour with a caring approach to protect your home and investment. Our team brings practical local knowledge and clear communication to every job.
20+ years’ experience, fully licensed & insured, Sydney specialists
More than 20 years of experience means we understand local soils and building types. We are fully licensed and insured and operate as trusted specialists in this region.
Minimal disruption, council‑compliant methods and workmanship warranties
We use non‑invasive techniques so you can often remain in your home during works. Our methods meet council standards and come with documented workmanship assurance.
We provide a clear warranty and as‑built records to support compliance and future sales or insurance needs.
Clear communication: speak to Chris on 1300 970 930
We keep you informed from first enquiry to final certification. You can call 1300 970 930 to speak to Chris directly.
Send photos for a prompt preliminary assessment and straightforward advice. We value long‑term relationships with our clients and stand behind our services with professional accountability.
- We bring more than 20 years of local experience to every project.
- We are fully licensed and insured, and we work to council standards.
- We focus on minimal disruption and safe delivery at your home.
- We provide workmanship assurance supported by documentation.
- We communicate clearly from first enquiry to completion.
Conclusion
A clear, engineered plan turns worrying movement into a manageable repair pathway. We stabilise ground and foundations using resin injection, concrete and screw piling where each suits best.
Many resin jobs finish within hours. Injection depths typically range from 800 mm to 6.5 m. Single‑day projects often sit between $5,000 and $15,000, depending on scope.
We focus on safety, compliance and getting the job done with minimal disruption. We fix slabs, repair walls and address voids and moisture at source so problems do not return.
Call 1300 970 930 to speak to Chris, book a site inspection or email photos. Learn more about our approach at what is underpinning for peace of mind and certified results.