Mainmark
Sydney, NSW
NSW Fair Trading licence checked
Resin injection
Ground-engineering and non-invasive resin-injection specialist operating across Australia.
Retaining Specialists Pty Ltd
Retaining Specialists Pty Ltd is a remedial building contractor based in Brookvale, NSW. Reach out directly to confirm availability and current rates.
Sydney's mix of coastal salt exposure and pockets of reactive clay and shale across the west and north-west means both concrete cancer and footing movement turn up regularly here.
As a 2025 guide, typical underpinning runs about $4,000 to $15,000 and concrete cancer repair varies widely with access -- a guide, not a quote. See the cost guide for the detail.
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Use the provider's current licence, insurance and written scope as part of the hiring decision.
Common questions
What services is Retaining Specialists Pty Ltd listed for?
Retaining Specialists Pty Ltd is listed on this directory under remedial and underpinning work. That reflects publicly available information about the business, not a verified service list, so confirm exactly what Retaining Specialists Pty Ltd can do for your job directly with them.
Is Retaining Specialists Pty Ltd licensed and insured?
Licensing and insurance are not part of what this directory verifies. Before hiring Retaining Specialists Pty Ltd, ask them directly for current licence and insurance details, and cross-check with your state's building or fair trading authority.
Should I get a structural engineer's assessment before contacting Retaining Specialists Pty Ltd?
A structural engineer's assessment comes first for anything more than fine cosmetic cracking. That report lets Retaining Specialists Pty Ltd and any other contractor you compare quote against the same diagnosed cause, rather than each guessing at the problem independently.
How much should I expect a job like this to cost?
Underpinning and concrete repair are quote-driven work, typically $4,000 to $15,000 for common residential underpinning jobs, but method, soil and access swing the number a lot. Get a written quote from Retaining Specialists Pty Ltd or any contractor you compare, and check it against our cost guide.
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