40 year reputation

We have built an enviable reputation over the past 40 years. For rolling up our sleeves, for finding solutions, for being resourceful, and for doing whatever it takes to get things done.

Large Delivery Capacity

We complete projects in NSW, QLD, and ACT. Experienced management capabilities and well organised financial and insurance arrangements enable the simultaneous undertaking of multiple projects.

Management Team

Ben Duncan

Ben has over 20 years of experience in the construction and property industry. As the Managing Director of CJ Duncan, Ben has been instrumental in building the business into one of Sydney’s leading building companies.

Sinclair Taylor

Sinclair is an experienced executive with over 20 years commercial experience in fire protection, security, and banking and finance. Sinclair is a lawyer by training and was previously at Westpac Banking Corporation for 12 years, where he held a number of senior management roles.

Josh Black

Josh has over 20 years experience in construction and property development, underpinned by a background in architecture working with the likes of Lendlease and Toga Group. He has refined and strengthened the capacity of the business and its relationships with key clients in the Fit-out & Refurbishment sectors.

Ian Richards

Ian has 35 years of experience in the construction industry and over 10 years in the insurance and remedial building sectors. Ian joined CJ Duncan in 2009 as a senior estimator and was promoted to the role of Operations Manager in 2011. He is now the General Manager of the Remedial and Insurance divisions.

Our Philosophy

Make it happen

We’re resourceful and reliable. If there’s a better way to do something, we’ll do what it takes to find it.

When we’re thrown curveballs, we’re proudly known for knuckling down, finding workarounds and solving problems to make things happen and keep projects on schedule. No fuss.

Play Fair

Say what you do and do what you say. We’re big on keeping commitments to our clients, and each other.

If we say we’ll do something, we won’t rest until we do. If there’s a problem we take personal responsibility and we put things right. Straight up.

Deliver Strong

The job isn’t over until it’s over. We stay focused, determined and professional at every stage of a project to ensure we get the job done right and never take our foot off the pedal.

We’re committed to finish just as strong as we start. Every time.

Our Values

We do what we say

At CJ Duncan, our word is everything. If we say we’ll do something, that’s precisely what we’ll do. From deadlines to budgets to paying contractors on time, what you hear is what you’ll get.

Built on Quality

Our reputation for delivering quality is everything. That’s why we never compromise or cut corners. We’re detail‑focused and use our market-leading skills to deliver projects to the highest possible level every time. We’re only as good as our last project, so it needs to be great.


We’re like a family

We’ve grown a lot. But we’ve never forgotten our family roots. After 40 years we’re still a tight knit business with a candid, people‑first attitude. From our clients and contractors to our in-house team, our success is built on a foundation of strong, personal relationships and respect.

Big results, low fuss

We make things happen. Maximum effort, minimum fuss. We take pride in our ability to knuckle down and get the job done. “Whatever it takes” has always been the attitude that drives us. If there is a smarter or more effective way to do it, we’ll find it.


I just wanted to write a quick note to say thank you to you and your team for the completed works at Mantra on Kent. The team were very professional and completed the job on time are very happy with the final works.

Emma Soutter

Area General Manager - NSW | Mantra on Kent

CJ Duncan | Building Strong
2020-08-26T17:02:47+00:00

Emma Soutter

Area General Manager - NSW | Mantra on Kent

I just wanted to write a quick note to say thank you to you and your team for the completed works at Mantra on Kent. The team were very professional and completed the job on time are very happy with the final works.

Over a long and sometimes difficult project, Brent from CJ Duncan was always professional in his approach to the works, and on numerous occasions, he demonstrated a thorough understanding of the needs and requirements of some demanding residents while still managing to “get it done”.

Rod Pyne

Building Manager | 1 Lauderdale Avenue, Fairlight

CJ Duncan | Building Strong
2020-09-30T10:15:17+00:00

Rod Pyne

Building Manager | 1 Lauderdale Avenue, Fairlight

Over a long and sometimes difficult project, Brent from CJ Duncan was always professional in his approach to the works, and on numerous occasions, he demonstrated a thorough understanding of the needs and requirements of some demanding residents while still managing to “get it done”.

McLarens has enjoyed a successful working relationship with CJ Duncan for many years. The duration of the relationship standing as testimony to this. The quality of workmanship, professional approach and technical ability demonstrated by CJ Duncan is of the highest standard.

Gary Vaccaro

Executive Adjuster

McLarens

CJ Duncan | Building Strong
2019-12-09T13:54:43+00:00

Gary Vaccaro

Executive Adjuster

McLarens

McLarens has enjoyed a successful working relationship with CJ Duncan for many years. The duration of the relationship standing as testimony to this. The quality of workmanship, professional approach and technical ability demonstrated by CJ Duncan is of the highest standard

Ben Duncan and his team provided us with a professional and flexible approach in a non-adversarial manner. Their ability to "think outside the square" in tackling complex issues has managed to ensure our targets were met.

Nick Marston

Director, Project Management

Altus Expert Services, Altus Group

CJ Duncan | Building Strong
2019-12-09T13:57:13+00:00

Nick Marston

Director, Project Management

Altus Expert Services, Altus Group

Ben Duncan and his team provided us with a professional and flexible approach in a non-adversarial manner. Their ability to "think outside the square" in tackling complex issues has managed to ensure our targets were met.

CJ Duncan is very professional to work with. Their management and site teams have a thorough knowledge of construction methods and are always fair and reasonable to deal with. We recommend CJ Duncan because of their level of understanding of complex remedial works and there experience with live strata environments.

Ian Prentice

Managing Director

Core Project Consulting

CJ Duncan | Building Strong
2019-12-09T13:55:40+00:00

Ian Prentice

Managing Director

Core Project Consulting

CJ Duncan is very professional to work with. Their management and site teams have a thorough knowledge of construction methods and are always fair and reasonable to deal with. We recommend CJ Duncan because of their level of understanding of complex remedial works and there experience with live strata environments.

CJ Duncan performs at a very high level and their work is done with great care and quality. We have used them many times and continue to engage them for works where a high level of quality is critical.

Dennis Stephenson

Managing Director | Diagnostech

CJ Duncan | Building Strong
2020-09-08T11:22:29+00:00

Dennis Stephenson

Managing Director | Diagnostech

CJ Duncan performs at a very high level and their work is done with great care and quality. We have used them many times and continue to engage them for works where a high level of quality is critical.

I have worked with CJ Duncan on various cladding replacement projects. CJ Duncan is an experienced team, dedicated to providing a great outcome for the client. I believe CJ Duncan are leading the industry in cladding replacement and rectification. These guys go the extra mile.

Johnny McGirr

Director

Cladding Compliance Australia

CJ Duncan | Building Strong
2019-12-09T13:52:30+00:00

Johnny McGirr

Director

Cladding Compliance Australia

I have worked with CJ Duncan on various cladding replacement projects. CJ Duncan is an experienced team, dedicated to providing a great outcome for the client. I believe CJ Duncan are leading the industry in cladding replacement and rectification. These guys go the extra mile.

I have worked with CJ Duncan for many years and on various remedial projects. They are professional, friendly and focused on solving building problems. They have the right attitude to making sure that the work is fit for purpose and executed to a high level with care and skill.

Paul Ratcliff

General Manager | Building and Waterproofing Inspections

CJ Duncan | Building Strong
2020-09-08T11:23:49+00:00

Paul Ratcliff

General Manager | Building and Waterproofing Inspections

I just wanted to write a quick note to say thank you to you and your team for the completed works at Mantra on Kent. The team were very professional and completed the job on time are very happy with the final works.

TM Insights worked closely with CJ Duncan in an ECI engagement for the Caroma Flagship Retail Store, Collins St, Alexandria. The challenges associated with complex staging works and site constraints were very well managed – The final product looks fantastic.


SAM DELIOS

TM Insights

CJ Duncan | Building Strong
2019-08-13T04:31:52+00:00

SAM DELIOS

TM Insights

TM Insights worked closely with CJ Duncan in an ECI engagement for the Caroma Flagship Retail Store, Collins St, Alexandria. The challenges associated with complex staging works and site constraints were very well managed – The final product looks fantastic.

CJ Duncan was appointed by Caroma to deliver their Flagship Storeroom at Collins St Alexandria. The team assisted during preconstruction by proposing value engineering options in order to meet the client’s budget requirements, and collaborated with the design team to ensure the desired outcome was achieved for Caroma. They delivered to a high quality standard in line with our expectations.


Kate Downing

Caroma

CJ Duncan | Building Strong
2019-08-13T04:16:40+00:00

Kate Downing

Caroma

The team assisted during preconstruction by proposing value engineering options in order to meet the client’s budget requirements, and collaborated with the design team to ensure the desired outcome was achieved for Caroma. They delivered to a high quality standard in line with our expectations."

Thank you very much for assisting us with not only replacing the combustible cladding from our building, but also your assistance with the complicated council sign off process. Additionally, thank you for your patience, help and support. You cannot possibly imagine the relief that this closure brings me and the owners group.

Darren Windus

OC Chairman, Marquis Apartments – Killara

CJ Duncan | Building Strong
2020-08-26T17:01:11+00:00

Darren Windus

OC Chairman, Marquis Apartments – Killara

Thank you very much for assisting us with not only replacing the combustible cladding from our building, but also your assistance with the complicated council sign off process. Additionally, thank you for your patience, help and support. You cannot possibly imagine the relief that this closure brings me and the owners group.
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CJ Duncan | Building Strong

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