EN
Contact us
Design

BIM modelling

Architecture, structure, building services and infrastructure, modelled to the information requirements and coordinated in a federated model ready for handover.
At a glance

B1P Group's BIM modelling produces the discipline models of an asset (architecture, structure, building services and infrastructure) with Revit and Civil 3D, in line with the exchange information requirements and the UNI 11337-4 levels of development, and coordinates them in a federated model. We work as an outsourced team for design practices and contractors, under the partner's name when needed, across Italy, at company and partner premises.

Definition

What is BIM modelling?

BIM modelling is the construction of the information model of an asset: not a three-dimensional drawing, but a set of objects (walls, beams, pipes, tracks) that carry geometry, materials, classification and data, and that can be measured, checked and delivered in the open IFC format.

Each discipline produces its own model; the discipline models are federated into a single model in which clashes are detected and decisions are coordinated before construction. The information content of each object is set by the information requirements, not by the software.

Deliverables
Discipline models in Revit or Civil 3D, federated model, families and templates, schedules and quantities from the model, 2D drawings extracted from the model, IFC export, coordination report
Standards
UNI 11337-1 and 4 (objects and levels of development), UNI 11337-5 (information flows), ISO 19650-2 (delivery), IFC ISO 16739, the project's exchange information requirements
Tools
Autodesk Revit for buildings and building services, Civil 3D for linear infrastructure, Navisworks and Autodesk Forma for federation and coordination; in-house automation for repetitive tasks
BIM modelling

Which disciplines do we model?

Architecture, structure (concrete, steel, timber), mechanical, electrical and special services (MEP BIM), linear infrastructure and civil structures. In 18 sectors, from civil buildings to industrial plants, with the families and standards each discipline requires.

Complex assets are not an exception: models with organic geometries, high-density services, long-span structures and underground works are handled with tailored parametric families and with modelling rules written before starting, so that they remain legible and measurable.

BIM modelling

How does outsourced BIM modelling work?

The practice or contractor sends drawings, information requirements and rules; B1P Group models with the client's templates and naming conventions, or with its own if the client has none, and delivers through the common data environment on agreed dates. The end client sees the partner's name when this is provided for by the B1Partners programme.

We work either for a lump sum, with a price per discipline and level of development, or by the hour, with BIM specialists working alongside the client's team. In both cases the delivery comes with an internal check of the models before they are sent.

BIM modelling

What do you get from a well-built model?

2D drawings that are consistent with each other because they are extracted from the same model; schedules and quantity take-offs without manual recalculation; clashes found in the office and not on site; an IFC file anyone can open, even without Revit. The model becomes the basis for construction and for asset operation.

Quality depends on the rules: object classification, shared parameters, families with the right level of detail, file and level names in line with the BIM execution plan. These are the rules that make a model checkable by third parties.

Levels

To what level of development do we model?

The UNI 11337-4 levels, as we use them in our offers. The level is set per discipline and per stage, not for the whole model.

Level (UNI 11337-4)Typical stageWhat the object contains
LOD CTechnical and economic feasibility designGeometry defined by overall dimensions, system and type, main performance data
LOD DDetailed designDetailed geometry and materials, data for quantities and construction planning, full classification
LOD EConstructionObject as it will be built: product, manufacturer, installation stages, data for 4D and 5D
LOD FAs-built modelObject as built and verified on site, with data for operation and maintenance
Related services

What does it combine with?

Frequently asked questions

Frequently asked questions about BIM modelling

Do you also model from 2D drawings in DWG or PDF?

Yes. It is the most common case in refurbishments and in projects where the design already exists in 2D: we rebuild the model from the drawings, flag any inconsistencies found between sheets and deliver the model with a list of the assumptions made where the drawings were not enough.

Do you work with the client's templates and standards?

Yes, and we prefer to: the client's templates, families, shared parameters and naming conventions ensure that the model integrates with theirs. If the client has no standards, we use ours and hand them over with the model.

What is the difference between LOD and LOIN?

LOD (level of development, UNI 11337-4) describes how far an object is developed in geometry and information; LOIN (level of information need, ISO 19650 and UNI EN 17412) starts from the opposite question: what information the recipient needs, and for what use. In our offers we use LOD as a common language and LOIN to avoid modelling more than necessary.

Do you deliver in IFC?

Always, together with the native files. IFC is the open format that public-sector information requirements call for, and it lets those who do not use Revit read, check and archive the model.

Contact

Do you have a project to model?

Send us the drawings and the information requirements: we will reply with disciplines, levels, timescales and a price for each.

Request a meeting B1P Group's BIM consultancy