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How do you BIM an existing building?. South West BIM Hub Ben Rouncefield-Swales URS – Sustainable Design & Construction [email protected] 07917 898548. One of the world’s leading engineering, construction and technical services firms. Focuses on four key markets:

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how do you bim an existing building

How do you BIM an existing building?

South West BIM Hub

Ben Rouncefield-Swales

URS – Sustainable Design & Construction

[email protected]

07917 898548

One of the world’s leading engineering, construction and technical services firms.

Focuses on four key markets:




Industrial & Commercial

Fully integrated services support full project lifecycle.

Serves federal, national, state and local government agencies, FORTUNE 500 companies and other multinational corporations.

Approximately 57,000 employees in more than 50 countries worldwide.

URS - Overview


who cares about existing buildings
Who cares about existing buildings?

Buildings are responsible for 40% of global energy demand

But 70% of all buildings in 2050 are already built

What are the Drivers for Change?

Energy costs drive landlords to improve the thermal efficiency of their existing building stock

The EPBD - net-zero energy by 2019 for all new buildings, and carbon neutrality by 2019 for all new commercial buildings

Unable to let E rated buildings from April 2018

Rising energy costs will force occupiers to adopt sustainable operations and improve the efficiency of M&E equipment

Research shows higher rental income secured for buildings with sustainability credentials

The Green Deal intended to stimulate the improvement of energy efficiency in existing buildings

Carbon Liability: schemes like the CRC require private and public energy users to pay a tax on their energy bill

what is happening now
What is happening now?
  • Traditional energy audits
    • Cost can vary depending upon level of output required
    • Some modelling may be done for high investment items – usually at design stage
  • More involved AM&T contracting
    • High cost and long contract periods
    • Creates good data but still need to work up into opportunities
    • Typically outputs are data not models
  • Energy Performance Contracting
    • Investment grade energy audit
    • Detailed modelling to underpin finance
    • No initial cost to client but pays through savings
  • Do It Yourself
    • Success varies depending upon in-house skills
    • Unlikely that any modelling would be done
that s why urs developed rem
That’s why URS developed REM
  • Rapid Energy Modelling
    • A tool developed by URS in partnership with AutoDesk
    • Uses innovative means to quickly construct a 3D model of the building
    • Physical Audit feeds information into the model
    • ReVit models the building and tests improvement measures
    • Ouptut leaves a legacy model for the building





Rapid Response
  • From the laser scan – in 2 hours
  • No drawings required – photogrammetry builds a 3D model
  • From a floor plan – in 30 minutes
  • Generated from 2D plans & elevations using AutoCAD, Revit, Vasari, Google Sketchup etc.
Option & Sensitivity Studies - Readily Undertaken


With external shading

Alter key building elements and observe impact on energy & CO2 outputs and also quality of internal space

city of london office introduction
City of London office - introduction
  • Late-Victorian office
  • Multi-tenanted
  • Circa 3,500 m2
  • 7 stories
  • Energy spend c. £50k p.a.
city of london office rem
City of London office – REM
  • Site visit circa 3 hours
  • Photogrammetry model
  • Rapid Energy Model created
  • Accuracy <10% difference


*includes small power, computers, communications equipment, printers etc

key issues
Key issues
  • Lots of buildings – most already built
  • Poor understanding of building performance
  • Traditional audit / survey take a long time
  • Need to act now to meet commercial imperatives:
    • Delivering cost savings
    • Improving energy performance
    • Enhancing working environment
    • Reducing carbon emissions
what benefits will rem bring
What benefits will REM bring?
  • It helps reduce a building’s energy running costs and CO2 emissions
  • It provides a rapid focus on building improvement options
  • It is a Building Information Modelling (BIM) process, creating a legacy model that can be retained and refined
  • Improves building user environment
Ben Rouncefield-Swales


URS – Sustainable Design & Construction

[email protected]

07917 898548

Thank You