NSW House Restumping & Foundation Repair Specialists

Expert House Restumping & Underpinning Services NSW

Claim your 100% free, no-obligation on-site assessment — a registered builder inspects your stumps, footings and subfloor, then gives you a fixed-price quote on the spot.

Uneven floors, cracked walls or doors that stick? Don't wait for a small foundation problem to become a costly one. We bring 20+ years of registered-builder expertise to homes across Greater Sydney, Newcastle, Wollongong and the wider NSW market.

Get My Free Assessment Call 0402-441-447

4.9/5 rated from 47+ Google reviewsRegistered buildersFully insured

20+ Years Experience
10-Year Warranty
Fixed-Price Guarantee
Free On-Site Inspection

Get Your Free On-Site Assessment

No obligation. We'll call you back the same business day.

Registered builders20+ years on the tools
10-year warrantyWritten structural guarantee
Fully insuredPublic liability cover
Fixed-price quotesNo variations mid-job
4.9/5 on Google47+ reviews

Servicing NSW as a mobile foundation repair team — our registered office is in Melbourne, VIC, and we travel to every NSW job we quote.

Why It Happens Here

Why NSW Homes Need Restumping

Foundation failure is not random — it tracks the ground and the weather. These are the conditions we see driving stump and footing failure across NSW, and they are the reason a repair specified for another state often will not hold here.

Western Sydney · Hunter plains

Reactive Clay & the Drought–Flood Cycle

Much of western Sydney sits on the Wianamatta Shale belt — through Blacktown, Penrith, Liverpool and Campbelltown — which weathers into highly reactive clay, commonly classified H1 or H2 under AS 2870. That soil swells when it is wet and shrinks back when it dries. NSW has swung from the 2017–2019 drought straight into record La Niña rainfall and back to dry again, and it is exactly that wet–dry whiplash that lifts and drops footings until floors go out of level and walls crack.

Illawarra · Newcastle · Central Coast

Coastal Salt Air & Humidity

Homes near the coast deal with salt-laden air and sustained humidity. Salt accelerates corrosion in steel fixings, brackets and ant caps, while humid air trapped in a poorly ventilated subfloor keeps timber stumps and bearers damp year round. The result is rot and rust that works from the bottom up, often well advanced before anything shows inside the house.

Eastern suburbs · Northern Beaches

Sandstone & Sand Profiles

Hawkesbury Sandstone and sandy coastal soils fail differently to clay. Instead of swelling and shrinking, they scour and wash out. Heavy rain and poor stormwater control can erode material from beneath footings, leaving stumps bearing on far less ground than they were designed for. The fix is rarely a like-for-like stump swap — the drainage has to be addressed too.

Illawarra escarpment · Hunter hillsides · North Shore

Sloping & Cut-and-Fill Blocks

A great many NSW homes sit on blocks that were cut into a slope and filled on the downhill side. Engineered fill settles over time, and it settles unevenly — the cut side stays put while the fill side drops. That differential movement is a classic cause of sloping floors, binding doors and stepped cracks in brickwork on escarpment and gully sites.

Sydney basin · Hunter

Termite Pressure on Timber Stumps

The Sydney basin and Hunter carry high termite pressure, and timber stumps in a dark, damp subfloor are a primary entry path into the structure. Damage frequently runs up through the stump into bearers and joists before it is noticed. Replacing affected stumps with correctly specified concrete or galvanised steel removes that pathway rather than renewing it.

Hawkesbury–Nepean · coastal NSW

Storm & Flood Saturation

East Coast Lows and Hawkesbury–Nepean flooding saturate ground far beyond the days the water is visible. Subfloors stay wet for weeks, soil bearing capacity drops while it is saturated, and stumps that were marginal before the event settle afterwards. Homes affected by recent flood years are worth assessing even where no damage was obvious at the time.

Warning Signs

Common Signs You Need Restumping & Reblocking

If you notice any of these signs in your NSW home, it's crucial to take action and contact a professional.

Uneven Floors & Soft Spots

Sagging, bouncy or sloping floors often indicate deteriorating stumps or soil movement beneath your home.

Cracked Walls & Ceilings

Cracks around doorways, windows and cornices are common signs of foundation settlement or shifting stumps.

Sticking Doors & Windows

Doors and windows that jam or won't close properly may signal structural movement requiring restumping.

Visible Stump Damage

Rotting timber stumps, rusting steel posts or gaps between stumps and bearers need immediate attention.

Exterior Brick Cracks

Step cracks in brickwork or gaps between walls and frames suggest your foundation is no longer level.

Moisture & Termite Damage

Damp subfloors and termite-affected stumps compromise load-bearing capacity and home safety.

How We Help

What 20 Years on the Tools Changes

Anyone can swap a stump. The reason our work in NSW holds is what happens before and around that — reading the soil, fixing what is putting water under the house, and specifying for the conditions the home actually sits in.

We read the soil, not just the stumps

Before anything is quoted, we assess what the ground under your home is doing — reactive clay, sand, fill or rock — because that determines what the replacement stumps need to be. Specifying for the soil class is the difference between a repair that holds and one that moves again in a few seasons.

Drainage and ventilation are part of the job

Stumps rarely fail on their own. We look at where water is going, how the subfloor breathes and whether moisture is being trapped, then tell you what needs to change. Treating the cause is why our work lasts — replacing stumps while leaving the water problem in place simply resets the clock.

Stump material matched to the conditions

Concrete, galvanised steel or treated timber, chosen for load, soil and exposure. On a humid coastal site that means corrosion-resistant fixings; on reactive clay it means footings sized and founded for the movement that soil will keep making.

Staged jacking so you stay in your home

We stage the lift and support so the structure is never unsupported and the house remains liveable through the works. Most of our clients stay put for the duration rather than paying for accommodation.

Fixed price before we start

After the on-site inspection you get a written scope and a fixed price. Not an hourly rate, not an estimate that moves once the subfloor is opened up. The price we quote is the price you pay.

Permits, engineering and a 10-year warranty

We handle council permits and engineering certificates as part of the job, and every structural repair is backed by a written 10-year warranty. That paperwork matters later — at resale, and with your insurer.

Book My Free Inspection Call 0402-441-447

Our Services

Foundation Repair Services NSW

House Restumping

When it comes to ensuring the stability and safety of your home, house restumping is a crucial service that should only be trusted to the experts.

House Reblocking

The Fort Knox Foundations is a Melbourne-based company that provides house reblocking, an essential service that ensures your home's safety and longevity.

House Releveling

If your home is experiencing uneven floors or structural imbalance, it's time to seek the expertise of Fort Knox Foundations.

House Underpinning

At Fort Knox Foundations, we offer top-tier house underpinning services in Melbourne, using advanced techniques to reinforce and stabilise weak foundations.

House Subfloor Repair

When it comes to maintaining the structural integrity and comfort of your home, the subfloor plays a crucial role.

House Foundation Repair & Maintenance

Fort Knox Foundations is your go-to expert for leading foundation repair services in Melbourne. We understand the critical importance of a stable foundation for the safety and longevity of your home or business.

Service Areas

NSW Cities We Serve

Free on-site inspections across Greater Sydney, Newcastle, Wollongong and surrounding New South Wales markets.

Sydney Newcastle Wollongong

Straight Answers

What Does Restumping Cost in NSW?

Most companies will not talk about price until someone is standing in your hallway. We would rather tell you what actually drives the number, so the quote you get makes sense — and so you can tell whether anyone else's is reasonable.

How many stumps need replacing

A partial restump of a dozen failed stumps is a very different job to a full reblock of an entire footprint. The inspection establishes exactly which stumps are gone and which are sound.

Access under the house

Generous subfloor clearance keeps costs down. Tight crawl spaces, concrete aprons, decks or additions over the original footprint all add labour.

Soil class and footing depth

Reactive clay and sites with poor bearing need deeper or wider footings than stable ground — more excavation and more concrete.

Stump material specified

Concrete, galvanised steel and treated timber differ in cost and in service life. We recommend what the conditions require and explain the trade-off.

How far the house has dropped

Releveling a home that has settled significantly takes longer, needs more staging, and may require plaster and cornice make-good afterwards.

Permits and engineering

Some scopes need engineering design and a council permit. We tell you up front whether yours does and include it in the fixed price.

Why Choose Fort Knox

Why Choose Fort Knox Foundations?

Your trusted house foundation repair specialists for New South Wales — registered builders delivering quality restumping, reblocking and underpinning with free on-site inspections.

Expertise and Experience

With years of industry experience, our team of skilled professionals has successfully completed numerous foundation repair projects. We bring a deep understanding of the unique challenges associated with house foundations and are equipped with the knowledge to provide tailored solutions that ensure long-lasting stability. Most houses with timber stumps will need restumping at some stage due to factors such as soil conditions and timber quality.

10-Year Warranty

We stand behind the quality of our work with a comprehensive 10-year warranty on all our foundation repair services. This guarantee gives you peace of mind knowing that your home’s foundation is protected and that we are committed to maintaining its integrity.

Licensed and Insured

Fort Knox Foundations is a fully licensed and insured company. Our team of registered builders adheres to the highest standards of safety and professionalism, providing you with confidence and trust in our services. You can rest assured that your home is in the hands of qualified and reliable experts.

Quality Workmanship

At Fort Knox Foundations, quality is at the forefront of everything we do. We use only top-grade materials and advanced techniques to provide precise and effective solutions for your home's foundation needs. Our team takes pride in delivering exceptional workmanship on every project, no matter how big or small.

Comprehensive Services

We offer a wide range of foundation repair services, including house restumping, underpinning, reblocking, releveling and more. Our all-inclusive approach means you can rely on us for all your foundation needs, whether it’s a minor repair or a major structural overhaul. We use both concrete stumps and timber stumps in our restumping services to address issues like rot, cracks, and termite damage, ensuring long-term stability and safety.

Personalised Solutions

At Fort Knox Foundations, we understand that every home is unique, and no two foundation issues are alike. That's why we provide personalised solutions tailored to your specific needs and budget. Our team will assess your home's foundation thoroughly and work with you to develop a plan that addresses the root cause of the problem and delivers long-lasting results.

Expert Advice

DIY vs Professional Foundation Repair

Why DIY Isn't an Option

Restumping requires hydraulic jacks, engineering knowledge and council compliance — not suitable for DIY.
Incorrect stump placement or inadequate concrete footings can cause catastrophic structural failure.
Working under a house without proper shoring and safety equipment puts lives at risk.
Insurance and resale value may be voided if foundation work is not performed by registered builders.

Why Choose Fort Knox

Registered builders assess load paths, soil conditions and building codes before any work begins.
Professional restumping includes permits, engineering certificates and warranty on workmanship.
Specialist equipment ensures precise levelling with minimal disruption to your home.
Fort Knox Foundations provides free inspections and transparent fixed-price quotes.

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Our Work

Projects Gallery

Google Reviews

What Our Customers Say

20+ years of foundation work and a 4.9/5 rating from 47+ Google reviews. We are a mobile specialist team — the same crew and the same standards travel to every NSW job.View on Google Maps →

★★★★★

"Chris and team were professional to deal with and execution of their works. We engaged Fort Knox to relevel our brick veneer home and couldn't be happier with the service."

Jake McLean · 2024-11-12

★★★★★

"Chris was great to deal with. Quick response and honest."

Theo · 2024-10-28

★★★★★

"Thank you Chris for restumping my new home. Really happy with the outcomes although the price is a lot more affordable compared with other companies I enquired."

Qingqing Luo · 2024-09-15

★★★★★

"Responsive, hard working, professional team delivered a great result with restumping and sub floor replacement."

Steven Newman · 2024-08-22

★★★★★

"Excellent underpinning work on our older weatherboard. Clear quote, on schedule and left the site tidy. Would use again."

Sarah M. · 2024-07-03

★★★★★

"Free inspection was thorough and honest. Restumping completed in three days — floors are level again and doors close properly."

David K. · 2024-06-18

Before You Call

NSW Foundation Repair FAQs

The questions homeowners ask us most — answered before you have to pick up the phone.

What is house restumping and when is it needed?

House restumping involves replacing the stumps that support a home. This process is necessary when the existing stumps deteriorate due to moisture, soil movement, or age, leading to structural instability. Restumping ensures that your home remains level and structurally sound.

How can I tell if my foundation needs repair?

Signs of foundation issues include visible cracks in walls or ceilings, uneven or sloping floors, sticking doors and windows, gaps between walls and floors, and water pooling around the foundation. If you notice any of these signs, it’s crucial to contact a foundation repair specialist for an assessment.

How much does foundation repair cost?

The cost of foundation repair varies widely based on the severity of the damage, the size of the property, and the specific repair method used. Simple crack repairs may cost a few hundred dollars, while extensive underpinning or restumping can cost several thousand dollars. A professional assessment is necessary to provide an accurate estimate.

How long does foundation repair take?

The duration of foundation repair depends on the extent of the damage and the specific repair method used. Simple repairs may take a few days, while more extensive work, such as underpinning or full restumping, can take several weeks. A professional assessment will provide a more accurate timeline.

Can I stay in my home during foundation repair?

In most cases, you can stay in your home during foundation repairs. However, there may be some disruptions depending on the extent of the work being done. It’s best to discuss this with your foundation repair contractor to understand any potential impacts on your daily routine.

What are the risks of delaying foundation repair?

Delaying foundation repair can lead to more severe structural damage, higher repair costs, and potential safety hazards. Issues such as wall cracks, uneven floors, and water damage can worsen over time, making timely repairs crucial to maintaining the integrity and safety of your home.

See all frequently asked questions →

Free Inspection

Request a Free Inspection in NSW

Tell us what you are seeing and we will come and look at it — no cost, no obligation, and a fixed-price quote if you want one. Call 0402-441-447 or fill in the form.

Let's Get Started in NSW

Contact Fort Knox Foundations now and take the first step towards ensuring your NSW home stands solid for future generations. Free on-site inspection — no obligation.

Request Free Inspection Call 0402-441-447

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