Understanding the production and delivery of cost information
The QS/cost manager needs to understand how a model, its attributes and other data will be created and conveyed at different stages of the project life. This will enable the QS/cost manager to make suitable adjustments to quantities, rates and other ancillary costs and modifications, at each work stage as appropriate.
Information provided to the QS/cost manager
At the early stages of the project the design may still be at the massing phase and in 2D, however, some designers may be issuing 3D data from concept stage. It may be that a 3D model may be received from one consultant and a 2D CAD from another. Non-graphical data such as specifications may also be provided (Microsoft Office Excel®, Microsoft Office Word®, PDF or other formats) and it is important these retain their association with their originating model. Levels of model detail and information at each stage will vary, depending on the nature of the project.
Objectives and general principles
The main objectives of this wiki note are to:
- Assist the QS/cost manager in deriving benefits from delivering cost consultancy services in a BIM environment, by utilising model data rather than traditional manual measurement in the production of quantities.
- Inform the team in the needs of the QS/cost manager in performing their measurement role in a BIM environment. Regardless of an EIR regime or document, this guidance note will be useful on all projects involving inputs/outputs to a BIM model/ project.
- It is recommended that the QS/cost manager is consulted in the production of the BEP and this guidance note should assist in contributions to the BEP (pre- and post-contract). If a BEP is inadequate or non-existent, then the recommendations in this guidance note can still be used to inform the rest of the team. However, the absence of an adequate plan is likely to impact on the success of the ethos of BIM.
The QS/cost manager will be expected to observe the tools, processes and standards that are agreed between the parties to share and re-use data.
This guidance supports BIM working at level 2 UK. However, as the required levels of data interoperability continue to vary between projects and sectors, it can be expected that working at level 2 BIM will differ between assets and continue to evolve.
This guidance note is about BIM as a multi-data model (sometimes referred to as a multi-dimensional model, 3D/4D/5D/6D), rather than a 3D-design model.
This guidance note does not align activities and outputs with a specific procurement route, but this will influence the flow of information and processes agreed between the parties.
If this guidance note is used outside of the UK, then verifications need to be undertaken to establish if similar national standards are already in place.
Topics outside the scope of this guidance note
- Contractual arrangements and any amendments thereto.
- Arrangements concerning intellectual property rights and professional indemnity (PI).
- Product names, software and hardware guidance or recommendations of particular systems.
- Any protocols required post-handover of the asset. (RICS are considering issuing protocols for post-handover of the asset at a later date.)
- Responsibilities of members of the design team (e.g. to deliver correct information, versions etc. to the QS/ cost manager and which should all be described in the BEP). The CIC BIM Protocol can be used in this regard, which can be incorporated into contractual documents.