Laser survey for Level 2 BIM Project case study

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C A Design Services’ Mark Johnson introduces this short video case study about the design development including laser survey and 3D BIM model of the £25 million Chelmsford Leisure Centre project.

As Mark explains, the riverside ice and leisure centre was originally built in 1967. It is now nearing the end of its life cycle. In 2015 Chelmsford City Council identified that the building could not meet the future demands of the city. The public consultation overwhelmingly supported the Council’s proposal to redevelop the leisure centre, which forms part of £500 million investment in the city centre.

Keith Prendergast, Director at Pick Everard comments,

“We were delighted that Chelmsford City Council selected us to design and deliver this key project.

Pick Everard Project Architect Justin Ashworth, goes on to explain:

“We retained the ice rink and sports hall to maximise the budget and improve the green credentials of the building. To link the existing building to the new development we created the concept of a double height entrance foyer. This created a link and formed a single building.

Keith Prendergast continues,

“To ensure the levels between the two buildings – new and old – are perfectly aligned it was essential that we carried out an accurate survey on site of the existing building. The critical nature of the survey meant that we needed to appoint an experienced specialist surveying partner.

We therefore approached C A Design Services who we’ve worked with on many previous occasions. They were commissioned to provide a BIM level 2 model of the existing building which is accurate to within 3mm.

Appointed by Pick Everard at the outset, C A Design Services advised on the development of the design strategy for the project.  We were able to help reduce project risk by delivering accurate and reliable site information of the existing building. We delivered the data as LOD400 Revit model accurate to within 3mm that could be used throughout by all parties with confidence.

Working closely with Pick Everard’s architects and structural engineers, our surveyors established the information requirements for the project. We specified the right scale of data and how we would construct the 3D digital Revit model. This meant we could deliver the model direct to the architect’s desktop within the agreed budget.

Mark Johnson takes on the story,

“Critically on this project Pick Everard appointed us as part of the design team. This meant we were able to collaborate with the architects and design team to define the survey specification in detail to meet Pick Everard’s design requirements. We undertook the site survey using engineering tolerances, using total stations with traditional traversing techniques to create site control networks. Using GPS rovers, we set the levels within the site. We then used 3D HD laser scanners to capture dimensional data and shared the data as point cloud information.

Following completion of the site survey and using the point cloud data file, we constructed a LOD400 Revit model. We delivered to model to the architects on their desktops so that they could commence work immediately. The architects are using this data throughout the duration of the project as a point of reference.

By delivering the survey data and model to the high degree of dimensional accuracy, it meant the architects, engineers and designers could work confidently on their design. Knowing that the design that they were proposing to link into the existing building would actually work

Pick Everard selected C A Design Services to be their survey partner on the project because of our extensive experience of BIM, our knowledge of 3D laser scanning technology and our ability to produce high quality, 3D revit models.

Keith Prendergast concludes:

The advantage of using a team of experienced BIM specialists such as Pick Everard and C A Design Services ensures the information produced is accurate, reliable and coordinated.

To read the case study please click here.

If you’d like to discover more about the full range of Survey Services offered by C A Design Services, please contact Mark Johnson or Iain Tubby on 01493 412806 or email