Welcome to AJA Projects

About Us

With over 25 years of delivering premium quality construction projects spanning two continents, company director Warren Rosen embeds his personal standard of high levels of customer service, impeccable attention to detail and efficiency in time and people management throughout the entire AJA Company.

Working closely with architects, engineers, designers and clients and with a vast network of the best in every trade, an in depth understanding of the construction industry and building codes and practices and refined interpersonal skills, the team at AJA strive to deliver outstanding results on every project, on time and on budget.


Warren helped us to realise our dream of a unique family home, combining two semis into a single house. From the outset, Warren was flexible and accommodating on what could have been considered an unconventional project. Warren was reliable and a very good communicator, using only high quality trades to deliver a fabulous family home within our agreed budget. We are delighted, both with the end result and the support Warren provided from the quoting stage to after care with minor issues long after our build had concluded. I am pleased to recommend Warren to others embarking on a project of their own.

- Victoria M, Keiran St, Bondi Junction.

We recently completed a beautiful renovation with AJA Projects.

The renovation included installation of a mobility access lift and shaft, demolishing and relocating a wooden staircase to allow for the lift with custom joinery built in underneath, installing a full height pivot door set as entrance doors and new timber flooring.

We found both Warren and Adam very competent, obliging and easy to work with. They were always on site and always answered our inquiries promptly and politely.

We would have no hesitation in recommending them.

- Anne & John F, Weonga Rd, Dover Heights.

When our ensuite bathroom’s waterproof membrane failed, we turned to Warren and Adam of AJA Projects to quickly turn the new bathroom around.

Adam coordinated all the relevant trades efficiently, was on site frequently to oversee each trade’s work, and was an effective, transparent communicator.

I’d recommend AJA Projects to anyone in the eastern suburbs looking to improve their house with a builder they can trust.

- Ben L, Gilderthorpe Ave, Randwick.

I just wanted to let you know what a pleasure it was for us to work with you and your team. Your professionalism, knowledge and help with our vision was very much appreciated. From the start you understood the vision we were trying to achieve, your tradesmen were amazing and the project was finished on time and within budget.

There was nothing that we asked that was too much trouble or impossible to do. It truly was a pleasure and a stress free project. Looking forward to working with you on the next project. Would be happy to highly recommend you and your team to any potential clients.

- Kevin & Julie F, Belah Ave, Vaucluse.

My apartment, located in Darling Point, was in the original condition when I purchased it at the end of 2017. It required a complete makeover. After meeting a number of builders, in consultation with my architects, Brad Swartz and Associates, we selected AJA Projects basing our decision on Warren’s confidence to deliver and his competitive price.

It took approximately 6 months to transform my apartment into a contemporary and stylish space. Warren worked very closely with the architects and was accommodating of changes that needed to be made during the course of the renovation. He came up with creative solutions when we hit snags and most importantly the workmanship is excellent.

Adam Ossher, who is Warren’s foreman, deserves a mention. Adam is hands-on and did a brilliant job coordinating the various tradespeople and staying on top of the process, always keeping me informed.

I would have no hesitation in recommending AJA Projects.

- Di S, Marathon Rd, Darling Point.

Technical References

Dover Heights

Project Scope:

Modern 3 level residence – concrete and double brick structure with internal lift.

Project duration:

14 months

Project Completion:

April 2014


I have worked with Warren Rosen over the past 6 years on a number of projects in which he was the Project manager. These projects have ranged from alterations and additions to new homes. The most recent project was a new 550-sq/m concrete and double brick construction starting with the demolition of an existing house, extensive rock excavation and piering to the completion and handover of the project.

In all the projects I have worked on with Warren, he performed his duties as a competent and experienced builder achieving a high quality of construction to the satisfaction of all the consultants and the client. He was knowledgeable about all aspects of the project and was able to plan, co-ordinate and manage the activities of the different sub contractors effectively. His attention to detail along with his strong organisational and people skills enabled him to complete the project in the allotted time and within budget.

I would highly recommend Warren Rosen as an experienced builder/project manager to carry out all kinds of residential construction works and would not hesitate to work with him again.

- Gary Meyers

Van Rooijen Meyers and Partners

Bellevue Hill

Project Scope:

New high end, 3 storey full brick and concrete residential building with internal lift. Construction cost over $2.1M;

Project duration:

16 months

Project Completion:

February 2016


I have worked with Warren Rosen on numerous residential projects in the last 5 years in which he was the builder and we were the structural engineers.

In all above projects Warren performed his duties as a competent and experienced builder achieving high quality of construction to the satisfaction of the all consultants and the client. He displayed an in-depth understanding of all facets of the building industry and could deliver the project on time and budget. Warren’s project management skills ensured the seamless co-ordination of all sub-contractors involved throughout the duration of the project.

I have no hesitation to recommend Warren Rosen as an experienced builder/project manager to carry out all kinds of residential construction work and would not hesitate to work with him again.

- Raphael Dracopoulos

R. Balas Consulting Pty Ltd


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Contact Details

Warren Rosen

0405 008 522