As-Built, Scan/CAD/PDF-to-BIM & Digital Twins

The final drawings and associated models incorporated the end-clients standards for architectural, landscape, structural, civil, and building services elements. Throughout, we developed BIM tools to support the efficient delivery of the models and drawings and incorporated relevant data for the final asset information model.

The as-builts incorporated various elements of light rail infrastructure, such as building and yard services, earthworks, CRS, drainage, utilities, structure, all civil works, overhead wiring, all rail systems, earthing and bonding, architecture, landscape, fencing and gates, roadworks, signage and wayfinding.

Our scope of work involved multidisciplinary as-built LOD 350 – 500 BIM modelling for 700,000 m² of existing buildings, including the Terminal 1 main building, link bridges, aircraft loading bridges, ground transportation centre, limousine lounge and associated tunnels, north satellite concourse and skypier.

To create the as-built BIM model, the Airport Authority provided us with thousands of pieces of reference information such as as-built architectural, structural and building services drawings, photos, data schedules, point cloud and panoramic photos.

From the reference information, we created a fully federated LOD 500 as-built BIM model, incorporating architectural, structural, building services, Special Airport Systems, and associated civil/underground utilities.

During the 2-year programme our team validated over 10,000 folders, 500,000 files and 391GB of information, and created and aligned over 3,000,000 BIM geometries.

Atlas is one of few companies in the world with the expertise and capacity to take on such a large project and deliver it to the aggressive programme. We mobilised a large multidisciplinary team to fully model the terminal building in the first 3-months to meet programme requirements. We then continued with model validation against point cloud files and asset tagging.

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Flexible resourcing allowed for the planning and enabling works, and heavy scan content to be undertaken in two weeks. And deployment of scalable teams enabled all work to be completed within a 6-month programme, with a team of 20 completing one phase in two months, and a team of 12 completing another in 4 months.

Using Revit, we created as-built scan-to-BIM models for 148 supermarkets and created specifically formatted .dwg files to allow the integration of the plans into the client’s shop planning and online retail software.

Using supplied point cloud data and survey CAD drawings, we developed a LOD 300 BIM model capturing the building’s existing architectural and structural conditions.

We created the models using existing drawings of only primary elements without precise finishes or detailed components, then overlayed them with point cloud scan data to verify and refine the model. The final deliverable was a LOD 300 Revit model incorporating architectural, MEPF, and structural elements.

This project supports facility management, future renovations, and long-term asset maintenance by providing a reliable digital representation of the building.

Our civil team alone contributed to the completion of more than 2,000 as-constructed drawings and 75 LOD 300 models incorporating roadways, footpaths, car park, utilities, retaining walls, fencing and barriers. As-constructed drawings were validated against models using as-built surveys, and updated asset tags for the constructed civil elements.

The work was performed using 12D, OpenRoads, Revit, Tekla, AutoCAD and Civil3D software, and throughout the project we developed custom BIM tools to support efficient production of more than 1,000 drawings per month, meeting all rigid documentation protocols. At completion we supplied a final asset information model (AIM) with all relevant model data.

The project comprises new stations, structures including road-over-rail bridges, sections of elevated viaduct, bridge and rail tunnel portal.

Working in Revit across all disciplines, with Plant 3D used for MEP services, the team developed accurate as-built drawings and models from hundreds of issued-for-construction 2D drawings, 3D models, redline mark-ups and survey data. Delivered over an approximately 15-month period, the coordinated digital outputs provided a reliable foundation to support planning, coordination and delivery of the facility upgrades.

With advanced Revit and point cloud expertise, our team produces parametric Revit Families ranging from simple to complex across all disciplines, allowing models to be easily adapted to suit different project requirements.

This encompassed partitions, finishes, ceilings, structure, fixtures and equipment, furniture, lifts, lighting, audio visual and sound systems, fire protection, drainage, mechanical services, and floor penetrations—providing a coordinated digital foundation to support design development, coordination, and future delivery stages.

Developed from 2D CAD information, the integrated Revit model was produced by a multidisciplinary team within a four-week programme, resolving clashes and construction challenges as the design progressed.

The coordinated BIM models were used by the main contractor during construction, while a millimetre-accurate point cloud survey informed a data-rich as-built model for digital walk-throughs and ongoing asset management. In parallel, we provided BIM training to AAHK teams in Hong Kong and Vietnam, helping build internal capability for the wider Three Runway System expansion programme.