At a glance

BIM for construction companies

For construction companies, B1P Group brings the site onto the model: pre-appointment BIM execution plan at tender stage, coordinated construction model, 4D programme, 5D quantities and progress and, at the end of the works, the as-built model required for testing, acceptance and handover, from the construction model or from a laser scan survey, in line with the exchange information requirements.

Four points of view, one model.

Construction companies

Construction, on the model first.

Time, cost and quantities checked on the model before work starts on site.

For contractors

The problem, and what changes

A design that can't be built as it stands

Buildability check before work starts on site

Delays and costs that get out of hand

Time in 4D and cost in 5D on the same model

Claims and subcontracts to defend

The model as evidence, with our partner law firm

As-built models rushed at handover

As-built model updated during construction

Checks done by hand, one by one

Model checks sped up by AI

As-built for acceptance AI for BIM BIM under your name: B1Partners

From tender to handover

Where we come in

Tender

Buildability check
Pre-appointment BIM execution plan

Design

Models optimised for construction

Construction

4D programme planning
5D cost control
Subcontracts and claims

Handover

As-built model compliant with the contract

Items marked legal concern contract support, provided with our partner law firm: the model also helps to write and check what has been signed and, if needed, to enforce it.

At the end

What you receive

Construction model
4D programme
Quantities and interim valuations from the model
As-built model

How we work

How does B1P Group work with a construction company?

We start from the contract: what the exchange information requirements ask of the contractor, at which progress stages, in which format. Then we bring the design model to construction level for the parts being built, link it to the bill of quantities and the programme and keep it up to date with variations before they reach the site. The model produces quantities by work item, interim valuations and construction phases and, at the end of the works, the as-built model with the data of the installed components.

The contractor's technical office does not need a BIM department: we work as its external department, with the site reporting the work completed and the model returning quantities and dashboards that the works supervisor can read without opening Revit. In design and build contracts we write the pre-appointment and post-appointment BIM execution plans; on contracts with heavy BIM requirements, legal support from our partner law firm helps to enforce what has been signed.

Completion

The works are finished: how is the as-built model handed over?

As projects funded by the PNRR (Italy's National Recovery and Resilience Plan) come to a close, many contracting authorities are asking contractors for the as-built model for testing and acceptance and for handing the asset over to whoever will operate it, often as a condition of the final interim valuation. The model must represent the asset as it was built, with the data of the installed components, in the formats set by the exchange information requirements.

There are two routes. If the construction model was updated during the works, it remains to check it with a verification survey and complete its data. If it was not, we start from scan to BIM modelling of the laser scan survey for the visible parts and from the site records (variations, works accounts, data sheets of installed products) for the hidden ones, such as concealed services, cable ducts and underground utilities.

We deliver the as-built model by discipline, the drawings derived from the model, the maintenance data and the report comparing design and as-built, in IFC and native format. How we work is described on the as-built BIM page.

Deliverables

What do we deliver, and when?

Deliverables follow the stages of the contract; the formats are those required by the information requirements or by the client.

Phase	Handover	Format
Tender and design-and-build	Pre-appointment BIM execution plan, BIM execution plan after the award	Document, following the structure of the EIR
Construction	Construction-level models, quantities linked to the bill of quantities, construction phases (4D), interim valuations from the model (5D)	RVT, NWD, quantity sheets, dashboards
Variations	Model updated before execution, comparison between design and variation	Models and reports
Completion, testing and acceptance	As-built model verified against the survey, component data for maintenance, drawings from the model, report comparing design and as-built	IFC and native format, COBie or the client's format

Frequently asked questions

Questions from a construction company

The site is closed and the model is out of date: can the as-built model still be produced?

Yes. We start from scan to BIM modelling of a laser scan survey for the visible parts and from the site records for the hidden ones. Time and cost are defined after a site visit: they depend on the size of the asset and on how well the works have been documented.

Work on site has already started: can you come in now?

Yes, it is the most common case: we take over the design models, bring them to the required level for the parts under construction and align the codes with the bill of quantities in the first two deliveries.

Does our technical office need to know how to use Revit?

No. The site reports the work completed; the model returns quantities, dashboards and drawings that the works supervisor and the client can read without any software.

Do you produce the as-built from the model or from a survey?

From the model, if the site team has kept it up to date; otherwise from scan to BIM modelling of a laser scan survey of the finished asset, with a report comparing design and as-built. It is best to decide this in the plan at the start.

Can we derive interim valuations from the model?

Yes, if the bill of quantities and the model use the same codes: we set this up in the first deliveries, then each interim valuation takes days instead of weeks.

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