The post-intervention file (PID) is the technical passport of your building. Here’s what it contains, when it’s required, and how to avoid nasty surprises during works.

What is a PID?

Think of it as your building’s technical passport. It gathers all the key info about the construction, materials and installations, and how to maintain them. Handy for you, but also for the next owner.

What does a full PID include?

Plans and diagrams of the structure and installations (heating, plumbing, electricity…).
Info on networks (water, gas, electricity, ventilation) and any hidden risks.
Contact details of the architect, safety coordinator, and contractors.
Maintenance instructions and guidance for repairs or renovations.
Specifications and materials used.
Technical sheets (electrical plans, ventilation, etc.).
Invoices, warranties, and maintenance information for appliances.

In short: everything you need to avoid unnecessary costs or surprises during renovations.

When is it mandatory?

For any building where construction started after 1 May 2001.
Not only for new builds, also for renovations after that date.

Who creates the PID?

Works with a permit: the architect or the safety coordinator.
Smaller works without a permit: you can create it yourself, as long as the information is correct and complete.

And if there’s no PID?

When selling, the seller must hand over the PID to the buyer at the time of the deed.

No PID? Two options:

Buyer and seller agree it’s not necessary.
The buyer can demand that a PID be drawn up, at the seller’s expense, by an architect or safety coordinator, before the sale.

Conclusion

The PID may feel like a pile of paperwork, but it’s your best protection against problems later. Think of it as your building’s user manual — the one you really don’t want to lose.