Atlassian Central
Sydney, Australia
Engineering Excellence for the World’s Tallest Hybrid Timber Tower
Atlassian Central, the world’s tallest hybrid timber tower, rising directly beside Sydney’s busy Central Station. Co-owned by Atlassian and Dexus, and constructed by Built in joint venture with Obayashi Corporation (BOJV), the project combines timber, steel, and concrete to cut CO₂ emissions and create healthier workplaces.
The 185‑metre, 42‑storey Atlassian Central tower is the centrepiece of Sydney’s new Tech Central innovation district. Built directly above the city’s busiest transport hub, the project combines offices for Atlassian, 137 hostel rooms, retail spaces and publicly accessible areas.
Its distinctive “inside‑out” design features seven freestanding timber “habitats”, each three to four levels high, positioned between steel‑and‑concrete mega floors. These habitats create spacious 15.15‑metre‑high timber zones with naturally ventilated, north‑facing open‑air areas that enhance wellbeing and reduce energy demand.
This ambitious mix of timber, steel and concrete — combined with constantly changing geometries and the constraints of a tight urban site — demands exceptional safety, logistics and construction control. To support this, Doka developed a 37.5‑metre record‑height protection screen combined with customised high‑rise solutions to ensure safe, efficient and reliable progress throughout every stage of the project.
Building type
Multipurpose building
Challenge
The project required safe and efficient construction at extreme heights, within very limited site space and complex floor geometries, while ensuring reliable and secure access routes at every stage.
Solution
Doka delivered a record‑breaking protection screen system with tailored system components and further capabilities, precise BIM coordination and perfectly sequenced logistics to meet all project requirements with maximum safety and efficiency.
Engineering a world-record solution
Doka’s contribution to Atlassian Central is a world‑record‑breaking protection screen: a fully enclosed 37.5‑metre‑high Protection screen Xclimb 60, the largest ever engineered and delivered by Doka — comparable in height to the wingspan of a commercial aircraft.
This landmark screen creates a safe, controlled environment for the installation of façade elements, placement of mass‑timber components, and high‑level slab‑pouring operations. By maintaining stable conditions at extreme heights, it enables efficient sequencing of trades and helps drive predictable progress throughout the build.
To achieve this, the screen solution combined several Doka systems with additional capabilities: The Modularity function of Doka UniKit, together with the SL‑1 heavy‑duty supporting system, enabled a tailored configuration to simulate and safely remove slabs — introducing innovative methods that boosted both safety and productivity. Multi‑Stressing Platforms supported all post‑tensioning operations, while dedicated stair towers provided direct vertical access, ensuring efficient crew movement between work zones.
The protection screen was engineered as a modular system, split into segments and climbed in meticulously planned sequences. This allowed the structure to “skip” intermediate floors, reducing fixing points and significantly saving time during the ascent.
Tom Matthews | Engineering Manager | Built Pty Ltd and Obayashi Corporation (BOJV)
„As our delivery partner on Atlassian Central, we worked closely with Doka to develop what are now the world's longest and most complex edge protection screens. The scale and technical demands on the project required genuine collaboration and advanced engineering expertise. Together, the team delivered a bespoke safety solution that set a new benchmark for high-rise edge protection.“
Coordinated logistics for efficient execution
Delivering a solution of this scale required logistics as advanced as the engineering itself. Approximately 600 tonnes of Doka material were dispatched from Amstetten, Turkey, China, Malaysia and Sydney. Coordinating these global supply streams demanded precise planning of transport, delivery sequencing and crane availability.
Given the confined environment around Sydney’s Central Station, site congestion had to be minimised. To ensure smooth assembly and rapid installation, major components — including platform modules, support elements and screen sections — were pre‑assembled at the Doka yard in Minto (Sydney). This strategy reduced work at height, improved quality control, and enabled large units to be lifted directly into place without interrupting other site activities.
Digital precision at the highest level
BIM planning at Level of Detail 400 (LOD 400) was a key factor in the success of this project. Every part of the system was fully developed and modelled in Revit, giving us a highly accurate 3D representation that supported clash detection, detailed connection design, safe lifting planning and a well‑coordinated construction sequence.
To keep the digital model fully aligned with what was happening on site, the engineering and project teams met weekly to review updates, check interfaces and confirm that planning, design and on‑site needs matched perfectly. This close coordination made it possible to move from digital planning to execution smoothly and confidently.
Avinash Srinivasreddy | Project Manager LSP | Doka
"Delivering the world-record protection screen for Atlassian Central, one of Australia’s most complex projects, challenged our team to perform at their best. From design to onsite work, we focused on a safe and precise solution tailored to the tower’s geometry. Pre-assembled screens and platforms streamlined installation and minimized work at height, a key benefit in Sydney’s tight environment. Effective logistics and planning were essential. This milestone highlights the dedication of Doka’s engineering teams and our strong partnership with the customer"
Project data
Year of completion
2026
Project duration
April 2024 – May 2026
Country
Australia
City
Sydney
Contractor
Built Pty Ltd and Obayashi Corporation (BOJV)
Client
Atlassian & Dexus
Building data
Total building height
185 m
Nb. of pouring steps/floors
42
Building dimensions
67 x 37 m
Typical habitat (reinforced concrete slabs clear height)
15.15 m
Number of concreting sections
n.A.
Height of the Protection screen Xclimb 60
37.5 m