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 a leading building company.

Josh Black

Josh leads the Estimating Teams and the Pre-Construction phase of all projects. Josh is responsible for all aspects associated with the front end of the business including Early Contractor Involvement, Value Management Solutions, Project Tendering and ultimately project conversion.

Ian Richards

Ian has over 30 years of experience in the construction industry, across both residential and commercial projects. Ian joined CJ Duncan in 2009 and is now the General Manager of NSW. He is involved in all projects by initiating project specific requirements at commencement and monitoring overall project performance throughout the construction and completion phases.

Greg Howard

Greg is the General Manager of the Queensland business, overseeing the delivery of all projects for a range of commercial, government, strata, residential and insurance industry related clients. Greg is a licensed builder and has 30 years industry experience across various construction sectors.

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.

What our
Clients Say
About Us

CJ Duncan completed a cladding replacement project for Centuria at St Leonards where I was the client representative. The work they did was of a high standard and with good attention to detail. I would be happy to recommend the CJ Duncan team for cladding and remedial projects.

Hannah Knight
Development Manager | Centuria Capital Limited

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

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 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

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

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

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

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

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

I worked closely with the CJ Duncan team on the rectification of the Zenix Residential Complex at Alexandria. It was delivered by a team with a positive attitude who always presented well, and managed themselves and their subcontractors professionally.

Danielle Hynard
Jackson Teece

Issues were never brought to me without a solution. The team was always available, responsive and nothing was too hard or a bother for them. They were fantastic to deal with.

PETER GEISSLER
Geicon Construction Management

CJ Duncan’s support and dedication was outstanding. The team repeatedly demonstrated their willingness to go out of their way to ensure they delivered the outcome required. The support on site was a stand-out point for CJ Duncan. They did a great job managing tradesmen, owners and tenants to ensure all works were completed to a high standard.

STEPHEN GILCHRIST
Masters Management Australia

I would like to call out the professionalism and expertise that was demonstrated consistently by CJ Duncan on our project to ensure the owners requirements were not only met but exceeded.

SHANE ALLEN
Owners Corporation Pavillions Glebe

I honestly believe that CJ Duncan’s attitude to ensuring a projects design intent is delivered is unique to the building industry. The Lend Lease Innovation Lab project has achieved excellent management feedback. I am pleased to be a referee for CJ Duncan.

LUCY CARSE
Innovation Manager

I have worked with CJ Duncan many times over the last 10 years and found them to be an exceptional company. They are a highly focused team and have a genuine commitment to quality and cost.

GERARD GRAHAM
Project Manager

CJ Duncan’s proactive, solution-focussed approach throughout the Lend Lease Display Suite project ensured that Lend Lease’s design vision was realised in every detail. The team was responsive, creative and, above all, added value to the process at every stage.

Phill Johnston
Delivery Manager NSW Apartments

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 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

I would thank the CJD team for the prompt and efficient manner that the restoration works have been carried out. All the tradesmen were polite, organised and completed their respective tasks in a timely manner.

Peter and Lyndall Lee
Homeowners