Understanding BIM in energy renovation: what you gain on site
BIM and digital models: simple definitions and how they differ from your usual plans
BIM is a way of working around a shared digital model. Unlike your 2D plans (PDF, DWG), the model describes "objects" (walls, insulation, networks, equipment) with dimensions and useful information. You can pull quantities and sections from it, and above all it gives you a common reference when things change mid-project.
Practical renovation cases: insulation, heating, ventilation, airtightness
- Insulation. Test thicknesses, spot thermal bridges, check supports and returns.
- Heating. Position a heat pump, its units, and secure the routing of connections.
- Ventilation. Set flow rates and the mechanical ventilation routing without clashing with the structure.
- Airtightness. Visualise membrane continuity and sensitive points.
When BIM becomes worthwhile: project size, complexity, coordination between trades
It really pays off once there are several trades involved, constraints from the existing building, or an occupied co-owned building. The gain is fewer reworks and cleaner coordination between insulation, HVAC and finishes. On small, isolated jobs, a "light" use (partial model, survey, execution drawings) is often enough.
Preparing a useful digital model: data to collect and the right level of detail
On-site surveys: photos, dimensions, networks, materials, thermal bridges (without wasting time)
For the existing building, the goal is to capture just what is needed to model quickly and accurately in BIM. Take a complete set of photos (façades, loft, basement, details), record the key dimensions (lengths, heights, thicknesses), locate visible networks and note the actual materials. Also spot likely thermal bridges, such as floor-to-wall junctions, window reveals, party walls and balconies, with a photo and a simple sketch.
Level of detail: finding the right balance for renovation (neither too much nor too little)
In renovation, useful precision is there first to help you quote, coordinate and avoid surprises. Aim for a level suited to the decisions at hand: walls with their main layers, joinery with dimensions and opening direction, technical volumes, and realistic tolerances. Fixing details or decorative objects can wait for the execution phase.
Structuring the information: rooms, walls, equipment, product sheets and marking sensitive points
Organise the model by room, then by wall and equipment. Add simple properties: area, target thermal resistance, insulation type, heat pump capacity, mechanical ventilation flow rates. Link product sheets to key objects, and flag sensitive zones: airtightness penetrations, moisture risks, ducts that need moving, maintenance access. You save time on site, and the decisions stay easy to read.
Running the renovation with BIM: coordination, quantities and anticipating errors
Clash detection: networks, ducts, openings, reservations and technical routes
In renovation, the 3D model acts as a circulation plan for all trades. In BIM, clash detection picks up early on a network crossing a duct, a wrongly placed opening, or a forgotten reservation. You settle it before drilling, not once the dust has already settled.
Quantities and orders: insulation, joinery, heat pumps, mechanical ventilation, accessories and safety margins
The model gives you reliable quantities by zone and by trade. Insulation, joinery, heat pumps, mechanical ventilation, accessories: you prepare your orders and your alternatives. Add a safety margin for offcuts, rework and supplier lead times, especially if the phasing requires several deliveries.
Site tracking: updates, execution drawings, geolocated photos and traceability
During the works, keep the model alive. Updates, execution drawings and geolocated photos create useful traceability for the as-built file (DOE), inspections, and grant applications when supporting documents are requested.
BIM in 2026: meeting requirements, speeding up files and securing grants
Linking with the energy audit, studies and supporting documents: what the model can simplify
A well-maintained BIM model acts as a common thread between the energy audit, on-site surveys and studies. You find areas, walls, insulation thicknesses, joinery and equipment all in one place. The result is faster quantity take-offs and plans, and you can more easily prepare the list of documents expected for grants. Quotes, invoices, technical sheets, site photos and instructions stay consistent with what was actually installed.
RGE and quality control: how the digital model helps prove what was actually done
The model helps trace "what was done". Product references, declared performance, intervention dates, execution drawings and specific points are all linked to it. With simple internal checks, you secure your evidence if a client, a certification body or a funder asks for supporting documents.
Archiving and the digital as-built file: handing the client a clear file and limiting disputes
At the end of the job, a digital as-built file (DOE) generated from the model brings together "as-built" plans, warranties, maintenance instructions and useful reference points. The client understands their home better, and you keep a clean file in case of a question, after-sales service or dispute.
Rolling out BIM in your company: a simple method and a gradual ramp-up
Choosing your organisation: in-house, outsourced, or a pairing with a BIM modeller
Start with a pilot project. Appoint an in-house lead if you already have a CAD base, otherwise go for clearly scoped outsourcing. The paired format works well: you keep control of the on-site decisions while the BIM modeller produces and updates the model. Set the deliverables, deadlines, and who signs off on what, from the outset.
Starting small: templates, product libraries, naming conventions and good practice
Speed comes from standards. Create a template per project type, a library of products you actually install, and a simple naming convention inspired by ISO 19650. Add a checklist to run before sending anything out. Within a few weeks, you gain clarity without adding to your daily workload.
Training the team: who does what (site, office, design) and how to avoid bottlenecks
On site, focus on usage: consulting the model on a tablet, flagging discrepancies, photos, measurements. In the office, keep a single point of entry for requests, and a weekly slot for updates. In the design phase, make use of quantities and sections. To avoid bottlenecks, keep a paper plan B at the start.
Key figures
15–25%
Coordination gain
< 10%
BIM adoption in renovation
20–30%
Error reduction
Frequently asked questions
For quoting and coordination, an LOD 200–300 is often enough: walls with their main layers and thicknesses, joinery at the right dimensions, HVAC technical volumes. Reserve LOD 350–400 for risk areas (network runs, false ceilings, airtightness junctions) to limit rework.
Louis Meneteau
CPO of Argile
