1. CHALLENGE
Capita Design are the market leader in strategic partnering
with UK local authorities, providing a wide range of
managed services including property, highways, regulatory
services and development control.
Capita required an accurate ‘as-built’ computer model as
part of a proposal for Scarborough Borough Council to
undertake a £2.5 million refurbishment of Scarborough
Market Hall. This as-built model was to comply with RIBA
Stages 2 and 3.
Key Challenges:
• Accurate survey of existing structure required
• Grade II listed building with unreliable 2D CAD drawings
• Building fully operation and accessible to general public
• Level of existing degradation to be recorded
• Capita would be designing the project in 3D Revit
software as a BIM project.
• Desire to reduce surveying time and save on costs
SOLUTION
A 3D Laser Scanning survey was completed of the entire
structure alongside a photographic scan. The resulting
‘point cloud’ data enabled the production of an as-built
model of the existing building.
The photographs taken at the same time were combined
with the data to create photo metric images. These allow
a detailed internal study of the space for heritage purposes
and a greater understanding for both client and officers of
the level of degradation in the original interiors. This reduced
risks for both the client and Capita.
AS BUILT LASER SCANNING
OF LISTED BUILDING
PROGRAMME SAVING AND MORE ACCURATE DATA FOR
GRADE II LISTED SCARBOROUGH MARKET HALL

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The as-built model allowed Capita to test their planning data
at RIBA stage 2 before submission and a set of clear existing
drawings was also created from the as-built model. As this is
a Grade II listed building, the data enabled detailed discussions
with English Heritage about refurbishment methods and
changes in the fabric of the building.
By comparison a traditional survey would have been from eye
and window level and limited in its detail use. It would have
required the surveyors to elevate and model the building in order
to check levels and sections in terms of interventions.
THE RESULT
Laser scanning enabled a programme saving of two weeks
in pre-planning and the detail design was risk free due to the
level of data gained at this initial stage.
English Heritage were able to fully see the building in its
context and fully understand the existing condition. The Laser
scanning also recorded the existing internal layout, alterations
and existing damage to the building. The resulting as-built
model was then used into RIBA Stage 4 as the project
progressed.
“Whilst levels and risk would have been
mitigated, we would have spent around
100 man hours on a traditional survey and
the outcome would have been a lesser
quality representation of the existing structure
with more margin for error. The design
team would also have spent much longer
integrating our Revit model into the existing
building.
“We chose Hobs Studio for their speed,
efficiency and value. The experience was
excellent and the team were flexible and
intelligent in the work. Going forward all of
our key projects that involve existing buildings
will use this service.”
Chris Boyce, Capita, Design Director
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