We stabilise foundations with engineered solutions to protect your home and property. Call 1300 970 930 to speak to Chris for a free no‑obligation assessment and fast, fixed‑price advice.
We are structural preservation specialists with over 20 years’ experience. We identify subsidence at its source and design council‑compliant plans that restore long‑term integrity.
Our services include traditional underpins that extend footings to stronger bearings, and modern resin injection and screw piling for minimal disruption. We coordinate structural engineering reports and certification so you have clear, honest choices.
Safety, transparent pricing and minimal disruption guide every job. You remain in control with a fixed‑price scope and an honest assessment; we never recommend unnecessary works.
Key Takeaways
- We provide engineered solutions to stabilise your foundation and protect your home.
- Options include traditional underpins, resin injection and screw piling tailored to local soil.
- Over 20 years’ experience, fully licensed, insured and council‑compliant methods.
- Free structural assessments, fixed‑price quotes and coordinated engineering reports.
- Fast, clear advice with a focus on safety and long‑term structural integrity.
Calm, engineered solutions to stop foundation movement and protect your Sydney home
Our team speaks plainly and calmly to reduce stress. We give clear, engineered options that focus on safety and permanent results.
Free, no‑obligation assessments and fixed-price quotes set out scope and inclusions so you can decide without pressure.
Non‑invasive options like resin-based re-levelling work quickly. Small injection points and fast curing cut disruption for occupants compared with excavation.
We measure your issues, explain each engineered approach and organise structural engineering where required for certification.
- Measured assessment of foundation issues with no sales alarm.
- Clear outcomes, compliance steps and a fixed‑price quote.
- We plan works to reduce noise, mess and interruption to your home life.
- If urgent, we prioritise stabilisation today and stage other works as needed.
Send photos for a fast assessment or call 1300 970 930 to speak to Chris and book a site inspection.
mass concrete underpinning sydney
Where safer, engineered outcomes matter, we often specify traditional concrete underpins to reach competent bearing strata.
Traditional underpins deliver reliable, council‑compliant results. They strengthen or extend existing footings to deeper ground so load transfer improves and settlement risk falls.
When traditional concrete underpins are the safest choice
We recommend this method for heritage buildings, sandstone footings and sites with poor soil where continuity matters. Continuous pours are used where an unbroken support run is required.
Continuous, hit-and-miss and strip footings for varied structures
Hit‑and‑miss sequencing protects piers by never undermining adjacent supports at once. New strip footings suit wider loads or altered layouts. We match the technique to your house, soil and engineering design.
- Planned sequencing controls risk and maintains safety.
- Curing, pour sequence and quality checks are in our scope.
- We monitor gaps and movement and document works for certification.
We choose the right method so your foundations remain safe and compliant.
Know the signs: subsidence and foundation distress to act on today
Small changes around your home can signal the start of serious foundation problems. We explain common signs and what to do first so you can act with confidence.
Cracks, sticking doors and sloping floors
Look for stepped or diagonal cracks in internal walls, especially near windows and corners.
Check for gaps at skirtings or where walls meet ceilings. Test doors and windows for sticking. Note if operation worsens after wet or dry weather.
External indicators and urgent warnings
Outside, watch for brickwork cracks, leaning elements and an out-of-square building. Rolling items on slopes or dips in floors can signal settlement.
- Prioritise rapid crack growth or frames pulling away from linings as urgent hazards.
- Some cosmetic issues can be monitored, but structural issues need assessment today.
- Document changes with dates and photos to help our engineers interpret the pattern.
| Sign | Likely cause | Action |
|---|---|---|
| Stepped cracks in walls | Settling or movement | Arrange inspection within days |
| Sticking doors or windows | Frame distortion from settlement | Monitor and photograph; call us if worsening |
| Leaning external elements | Ground movement or subsidence | Urgent site assessment and safety check |
We differentiate cosmetic problems from true structural damage in a calm, objective way. Call 1300 970 930 for guidance and to arrange an inspection of your house and property.
Why foundations fail in Sydney soils
Seasonal moisture shifts in local soils create stresses beneath building footings.
That moisture change is the main driver of small and large movement. We see it cause ongoing subsidence in many areas.
Reactive clays, moisture swings and drainage faults
Reactive clay shrinks in dry weather and swells when wet. This cycling stresses footings and leads to differential movement.
Leaking pipes and poor drainage add water. Wet soil loses bearing capacity and can fail under load.
Traffic vibration, excavation and poor site preparation
Nearby excavation or constant road vibration disturbs soil equilibrium. Poor initial ground preparation and shallow footings make problems worse.
Natural compaction over time also changes support beneath a building. These factors change how designs must perform.
Practical steps we take
- Assess water pathways, tree roots and surface grading to reduce risk.
- Recommend simple drainage fixes and maintenance to limit moisture swings.
- Design remedies that reach competent layers, bypassing unreliable near-surface soils.
| Cause | Effect | Quick action |
|---|---|---|
| Reactive clay cycles | Seasonal heave and settlement | Monitor and address drainage |
| Leaking drains | Softened soil, loss of support | Repair pipes and regrade surface |
| Vibration & excavation | Accelerated settlement | Site assessment and structural plan |
Early action limits damage and gives clearer design options. For non-invasive options like resin injection or to compare methods, see our resin injection vs concrete underpins guide.
Our engineered methods: concrete underpins, resin injection and screw piling
Different sites need different engineered solutions to stop movement and restore support. We assess the site, then match the right method to the ground conditions, access and the extent of subsidence.
Concrete underpinnings: depth and pier sequencing
Concrete underpinnings extend footings to competent bearing strata. We use staged excavation and pour sequencing so adjacent piers remain supported during work.
Resin injection: non-invasive re-levelling
Resin injection improves the ground through small holes (6–16 mm). The resin cures fast—often about 30 minutes—and can lift and re-level floors with minimal disruption.
Screw piles: reach stable layers where access allows
Screw piles extend support to deeper, stable layers. They suit sites with enough access and where the target bearing layer is well defined.
When resin is not appropriate
Chemical or resin methods are not suitable for severe structural damage, large-scale instability, uncertain ground or very deep foundations. In those cases, traditional underpins are usually the safer, permanent solution.
- We set depths to competent bearing layers and specify safe sequencing.
- Small injection holes and quick cure reduce disruption to you and landscaping.
- Designs are certified by a structural engineer for compliance and peace of mind.
For a clear explanation of what underpinning involves, see our what is underpinning page.
How mass concrete underpinning works on your property
A clear, step-by-step plan starts every project so you know what to expect and when. We describe the process simply and show how safety, sequencing and certification protect your home.
Site assessment, soil conditions and engineering design
We begin with a structural assessment and a soil review. This confirms soil conditions, ground bearing and any risks to footings.
Our engineer designs the solution to match access, foundation layout and council requirements.
Excavation under footings, underpin pours and curing
Excavation is carried out in short sections beneath footings to keep the structure supported.
Each pier is poured and left to cure for the required time. Cure times are longer than resin methods, so staged works protect stability.
Staged “hit-and-miss” sequencing to maintain safety
We use hit-and-miss sequencing so adjacent areas are never open at once. This reduces risk while works progress.
Monitoring continues throughout. We document movement and photograph each stage for certification.
Re-levelling, crack stitching and finishing works
After supports are stable, we re-level floors, stitch visible cracks and tidy finishes. Spoil is removed and sites are left clean.
All works are certified and you receive clear completion records.
- Daily updates so you know what is complete and what comes next.
- Planned to suit soil conditions and access to limit disruption.
- Typical timeframes vary from a few days to several weeks, depending on depth and access.
Compliance, certification and structural engineering oversight
Our process ties disciplined site controls to clear engineering sign‑offs for peace of mind. We manage assessment, design and certification so you know approvals will be handled correctly.
Council-compliant methods and documentation
We follow council rules and Australian Standards for every project. Documents, permits and method statements are prepared before work starts.
Pre-start checks define risks, staging and monitoring. This reduces delays and helps close approvals smoothly.
Structural engineering reports and certification coordination
Our qualified team coordinates reports from structural engineers. Designs verify loads, bearing strata and required foundation enhancements.
- Your project is delivered by a qualified team with engineering oversight.
- We provide as-built records, photos and certificates for your property file.
- Clear communication keeps you informed at every compliance milestone.
| Document | Why it matters | Typical timing |
|---|---|---|
| Structural report | Verifies design and load paths for the building | Before permits and works start |
| Method statement | Outlines safe sequencing and site controls | Issued with permit applications |
| Completion certificate | Closes approvals and confirms integrity | After final inspections and tests |
Our years of experience on many projects help us choose the right solutions for each property and soil condition. You receive disciplined records that protect the integrity of your structures.
Costs, timeframes and disruption: what to expect
Understanding likely costs and time helps you choose the right method for your house.
Transparent fixed-price quotes with scope clarity
We provide a clear, fixed-price quote that lists inclusions and exclusions. You see cost drivers up front: depth, access, soil conditions and engineering requirements.
Project durations: from days to weeks depending on depth and access
Typical time ranges depend on depth and site access. Shallow traditional underpins can take a few days. Larger works may take several weeks.
Indicative ranges: about $1,000–$3,000 per metre for mass concrete; shallow traditional often $1,000–$4,500 each; resin injection commonly $1,100–$1,400 per linear metre. Deeper works cost more due to shoring.
Minimising disruption to gardens, paths and daily living
We plan works around your daily life. We protect gardens, paved areas and services. Spoil is managed and finishes are restored.
We manage water and weather factors that affect sequencing and access. If a problem arises on site, we consult you immediately with options and costs.
- Transparent quote with listed inclusions
- Clear explanation of cost factors and methods
- Scheduling to limit disruption to your house and area
- Daily communication so you know the process and time
| Item | Typical range | Notes |
|---|---|---|
| Mass concrete per metre | $1,000–$3,000 | Deeper runs raise cost due to shoring |
| Shallow traditional underpin | $1,000–$4,500 each | Depends on access and pier size |
| Resin injection | $1,100–$1,400 per linear metre | Fast cure, less site disruption |
Why choose Underpinning Sydney
A clear, honest appraisal sets the tone for safe, cost‑effective foundation work. We combine local soil knowledge with engineered designs so you get the right solution for your property.
20+ years’ experience, fully licensed and insured
We bring over 20 years’ experience working on local projects and council processes. Our licences and insurance cover you across each stage.
Honest assessments—we don’t upsell unnecessary work
Our assessments focus on real issues and clear outcomes. We don’t push extras; we recommend the least invasive solutions that deliver lasting integrity.
Local team with council‑ready processes
Our local team manages approvals, documentation and on‑site safety. We provide council‑ready reports, photographs and completion records to avoid delays.
- We match solutions to your budget and long‑term objectives.
- Proven practices combine soil knowledge with engineered designs.
- Track record across many projects demonstrates dependable outcomes.
- We stand behind our workmanship and support you after completion.
- Call Chris on 1300 970 930 to discuss options for your foundations and subsidence concerns.
Beyond underpins: complete structural preservation services
Our team coordinates above- and below-ground works to keep your property dry, level and secure.
Wall crack repairs, subfloor ventilation and retaining wall support
We repair wall cracks and stitch structural joints to restore continuity in affected walls. The work is discreet and engineered to last.
Subfloor ventilation reduces trapped moisture. Better airflow protects timber framing and masonry from water damage and decay.
Retaining wall support options address lateral ground pressures that threaten surrounding building areas. We design solutions that suit heritage and sensitive sites.
Resin injection re-levelling and void filling
Resin techniques can stabilise ground and fill voids with minimal excavation. These methods improve bearing capacity and help re-level floors quickly.
We integrate foundation repairs with above-ground remediation. The result is a dry, stable substructure that protects finishes and fixtures.
- We repair wall cracks and stitch structural joints to restore continuity.
- Subfloor ventilation controls moisture to protect timber from water impacts.
- Retaining wall support counters lateral pressure on building surrounds.
- Resin fills voids and stabilises the ground with little disruption.
- All works are coordinated into a single plan for sensitive areas and heritage buildings.
Start with a no-obligation structural assessment
Begin with a quick, no‑obligation check so you know the scale of the problem and your next steps. We make the first contact low friction and fast. You get clear guidance without commitment.
Call 1300 970 930 to speak to Chris and book a site inspection
Call us and describe the problem and the area. We confirm details and schedule a time that suits you.
Email photos for a preliminary assessment and fixed-price quote
Email photos of the affected area for a fast, preliminary assessment. We reply with an initial view and a clear next step.
- Simple three-step process: enquiry with problem and address; schedule; expert site visit.
- On site, we diagnose the foundation issue and outline practical options for your house.
- You receive a fixed-price quote and a clear program of works.
| Step | What we do | Your outcome |
|---|---|---|
| Enquiry | Call or email with photos and address | Fast initial assessment and booking |
| Inspection | Site visit by our experienced team | Clear diagnosis and urgency level |
| Quote & plan | Fixed-price quote and program | Peace of mind and compliance steps |
Start with no obligation. Call 1300 970 930 or email photos today. We coordinate any council or certification work so you can act with confidence.
Conclusion
The right engineered fix turns an urgent problem into a permanent solution for your home.
We stabilise foundations and stop subsidence with methods chosen for your soil and building. Repairs restore floors, walls and door frames so your house works properly again.
Concrete solutions give durable performance when staged and certified. Resin options offer fast, non‑invasive ground improvement where suitable.
We design to address movement patterns, piers and footings, then document every step for compliance and peace of mind.
Speak to Chris on 1300 970 930 to book an assessment or email photos for a no‑obligation review and fixed‑price plan. Learn more at our services page.