Mainmark
Sydney, NSW
NSW Fair Trading licence checked
Resin injection
Ground-engineering and non-invasive resin-injection specialist operating across Australia.
Remedial and underpinning contractors in Sydney
Sydney combines coastal salt exposure, which drives concrete cancer in older apartments, balconies and basements, with pockets of reactive shale and clay across the west and north-west that move footings seasonally. Much of that western and north-western clay is weathered Wianamatta Group shale, principally Ashfield and Bringelly shale, which runs from around Campbelltown and Liverpool through Parramatta and into parts of the inner west and is one of the more extensively studied reactive soils in the country. Closer to the harbour, sandstone footings are generally stable, so the concrete cancer common in 1960s-80s brick apartment blocks and balconies there owes more to that era's waterproofing and steel-cover detailing than to the ground beneath them. Below are remedial and underpinning specialists serving greater Sydney; we keep adding to this list as we verify more.
33 providers listed
Use each profile as a starting point, then ask the provider for current service, licence and insurance details.
Typical underpinning runs about $4,000 to $15,000 (a guide, not a quote). See the underpinning cost guide before you compare quotes.
Curious how Sydney's soil compares to other capitals? Read reactive clay and subsidence risk by city.
For a useful shortlist, match the contractor's service focus to the symptom you are seeing: cracks and sloping floors usually need foundation or underpinning experience, while rust stains, spalling concrete and failed balcony waterproofing point toward remedial building work.
Get quotes from Sydney remedial and underpinning contractors
Tell us what you are seeing and roughly where the property is. We will match you with a remedial or underpinning contractor serving your area.
Remedial Building Services
Sydney, NSW
NSW Fair Trading licence checked
Concrete cancer repairWaterproofing
Sydney remedial builder focused on concrete cancer repair, remediation and waterproofing.
Sydney House Levelling
Sydney, NSW
House levelling and underpinning specialist serving greater Sydney.
CARE - Concrete & Corrosion Rehabilitation
Sydney, NSW
Waterproofing
CARE - Concrete & Corrosion Rehabilitation operates in the Banksmeadow, NSW area, offering remedial building services, including waterproofing. Contact them directly for a current quote.
Streamline Concrete Patching
Sydney, NSW
Concrete cancer repairStructural crack repair
Streamline Concrete Patching is a remedial building contractor based in Mona Vale, NSW, including concrete cancer repair and structural crack repair. Reach out directly to confirm availability and current rates.
Concrete Lifting Services
Sydney, NSW
Resin injectionStructural crack repair
Concrete Lifting Services operates in the Matraville, NSW area, offering remedial building services, including resin injection and structural crack repair. Contact them directly for a current quote.
ANDERSAL PTY LTD
Sydney, NSW
NSW Fair Trading licence checked
Concrete cancer repairWaterproofingStrata / apartment experience
ANDERSAL PTY LTD serves Alexandria, NSW on government, industrial, commercial and strata projects from $15K to multi-million-dollar in scale, including concrete cancer repair and waterproofing. Its own site says it is not resourced for minor repairs to private residences. Confirm current licensing and a structural engineer's assessment directly before booking.
British Concrete
Sydney, NSW
Concrete cancer repairStructural crack repair
British Concrete is a remedial building contractor based in Greenacre, NSW, including concrete cancer repair and structural crack repair. Reach out directly to confirm availability and current rates.
WS Remedial Group (NSW) Pty Ltd
Sydney, NSW
Concrete cancer repairWaterproofingStructural crack repairStrata / apartment experience
WS Remedial Group (NSW) Pty Ltd is a remedial building contractor based in North Rocks, NSW, including concrete cancer repair, waterproofing and structural crack repair. Reach out directly to confirm availability and current rates.
CFS Building & Construction
Sydney, NSW
NSW Fair Trading licence checked
Concrete cancer repair
CFS Building & Construction operates in the Rozelle, NSW area, offering remedial building services, including concrete cancer repair. Contact them directly for a current quote.
Restorial Pty Ltd
Sydney, NSW
NSW Fair Trading licence checked
WaterproofingStrata / apartment experience
Based in Marrickville, NSW, Restorial Pty Ltd offers underpinning and structural repair services to local homeowners, including waterproofing.
Atomic Projects
Sydney, NSW
Concrete cancer repairWaterproofingStructural crack repairWorks from engineer's report
Atomic Projects serves Croydon Park, NSW and works strata and commercial buildings only, covering concrete cancer repair, waterproofing and structural crack repair. Its own site says typical projects run from $250K, but it scopes smaller packages too, with its estimator starting at the $20–60K band, and says it is worth a call for remedial work in Sydney.
TC Remedial And Waterproofing
Sydney, NSW
TC Remedial And Waterproofing operates in the Dee Why, NSW area, offering remedial building services. Contact them directly for a current quote.
BiM Remedial Sydney
Sydney, NSW
Concrete cancer repairWaterproofingStrata / apartment experience
BiM Remedial Sydney serves Frenchs Forest, NSW with remedial and underpinning services, including concrete cancer repair and waterproofing.
Sydney Piling PTY LTD
Sydney, NSW
NSW Fair Trading licence checked
Sydney Piling PTY LTD serves Mascot, NSW with remedial and underpinning services.
A1 Underpinning
Sydney, NSW
NSW Fair Trading licence checked
Restumping / reblockingStructural crack repair
Based in Cambridge Gardens, NSW, A1 Underpinning offers underpinning and structural repair services to local homeowners, including restumping and reblocking and structural crack repair.
Based in Blaxland, NSW, Pierite - Sydney's Underpinning & Pier Replacement Experts offers underpinning and structural repair services to local homeowners.
Underpin Solutions
Sydney, NSW
Underpin Solutions serves Sans Souci, NSW with remedial and underpinning services.
Screw Piling Experts Wolli Creek
Sydney, NSW
Screw Piling Experts Wolli Creek is a remedial building contractor based in Wolli Creek, NSW. Reach out directly to confirm availability and current rates.
Sydney House Levelling
Sydney, NSW
Resin injectionRestumping / reblocking
Sydney House Levelling is a remedial building contractor based in North Rocks, NSW, including resin injection and restumping and reblocking. Reach out directly to confirm availability and current rates.
Mainmark Sydney
Sydney, NSW
Resin injection
Based in North Sydney, NSW, Mainmark Sydney offers underpinning and structural repair services to local homeowners, including resin injection.
On Point Piling
Sydney, NSW
NSW Fair Trading licence checked
On Point Piling operates in the Banksmeadow, NSW area, offering remedial building services. Contact them directly for a current quote.
Surefoot Underpinning Specialist
Sydney, NSW
Structural crack repair
Surefoot Underpinning Specialist serves Appin, NSW with remedial and underpinning services, including structural crack repair.
Concrete Lifting (Jacking) Specialists
Sydney, NSW
Resin injectionStrata / apartment experience
Concrete Lifting (Jacking) Specialists operates in the Millers Point, NSW area, offering remedial building services, including resin injection. Contact them directly for a current quote.
Eastside Piling
Sydney, NSW
NSW Fair Trading licence checked
Eastside Piling is a remedial building contractor based in Kingsford, NSW. Reach out directly to confirm availability and current rates.
Restumping / reblockingWaterproofingStructural crack repair
Based in Wilton, NSW, Best Underpinning Sydney- Underpinning Sydney,Retaining Walls Sydney offers underpinning and structural repair services to local homeowners, including restumping and reblocking, waterproofing and structural crack repair. Confirm licence status with the state regulator before hiring.
sydney piers and restumping
Sydney, NSW
Restumping / reblockingStructural crack repair
sydney piers and restumping serves Lurnea, NSW with remedial and underpinning services, including restumping and reblocking and structural crack repair.
Helitec Structural Services
Sydney, NSW
Structural crack repairStrata / apartment experience
Based in Alexandria, NSW, Helitec Structural Services offers underpinning and structural repair services to local homeowners, including structural crack repair.
Affordable Underpinning Solutions
Sydney, NSW
Resin injectionRestumping / reblocking
Based in Dapto, NSW, Affordable Underpinning Solutions offers underpinning and structural repair services to local homeowners, including resin injection and restumping and reblocking.
Foundation Repair
Sydney, NSW
Foundation Repair serves Chester Hill, NSW with remedial and underpinning services.
Sydney Contracting Engineers
Sydney, NSW
NSW Fair Trading licence checked
WaterproofingStrata / apartment experience
Based in Artarmon, NSW, Sydney Contracting Engineers offers underpinning and structural repair services to local homeowners, including waterproofing.
Mardini Constructions
Sydney, NSW
NSW Fair Trading licence checked
Waterproofing
Mardini Constructions serves Marrickville, NSW with remedial and underpinning services, including waterproofing.
Retaining Specialists Pty Ltd
Sydney, NSW
NSW Fair Trading licence checked
Retaining Specialists Pty Ltd is a remedial building contractor based in Brookvale, NSW. Reach out directly to confirm availability and current rates.