Building commissioning

Toulon · From brief to the first year of operation

No one would deliver a car without driving it. Commissioning organises, across the whole project, the verification and the evidence that a building's technical systems reach their designed performance. ARKENOR carries that assignment in Toulon.

Discuss a project Scope and phases

Toulon · Provence-Alpes-Côte d'Azur

What calls for a commissioning assignment in Toulon.

Toulon works on its existing stock more than on new build. Old-town renovation, housing refurbishment, upgrading of public facilities: this is a market where commissioning appears in its most useful form — retro-commissioning of installations already in service — and in its most demanding one, deep refurbishment where the design assumptions rest on a poorly documented building.

The building stock

What Toulon changes about verification.

A refurbishment is not a new build with extra constraints: it is a project whose input data is uncertain. Nobody knows the real condition of buried services, the exact make-up of the walls, or the history of successive modifications to an installation. The energy model therefore rests on assumptions, and the gap between calculation and reality is structurally wider than in new construction.

This is exactly where commissioning earns its cost, because it does not require the model to have been right: it verifies the outcome. On a refurbishment the assignment usually opens with work that new build never involves — reconstructing what exists, identifying what has been modified without being documented, and establishing a reference condition before works start. That work governs everything else, and it is almost always absent from the design appointment.

Occupied-site constraints follow, and they are common in housing refurbishment. They require commissioning in phases, on installations partly in service, with tests that cannot mobilise the whole building at once. That can be planned, and it becomes expensive when it is not.

The full phase-by-phase structure of the assignment is set out on our page on the scope and phases, and the wider discipline on building commissioning.

The assignment

Five phases, and the first one decides the rest.

Roughly a third of the work happens before ground is broken. A project that discovers the subject during construction has already lost what should have been documented upstream, and it does not come back.

  1. 1 Brief Write down what is expected of the building before it is drawn. Everything else is measured against it.
  2. 2 Design Critical review of drawings and specifications, and insertion of testing clauses into the works packages.
  3. 3 Construction Review of contractor submittals, attendance at verifications, one single issues register.
  4. 4 Handover Functional testing, and comparison of the functional description with the parameters actually loaded.
  5. 5 First year Seasonal testing and optimisation, while the one-year statutory completion guarantee still runs.

Applicability

No regulation requires it. Several schemes do.

Commissioning is not required by any French building regulation. It becomes binding by contract as soon as a project targets a label or a certification: LEED places it in a prerequisite that cannot be traded away, BREEAM treats it in a dedicated credit with seasonal testing in a separate one, the Effinergie labels require it unconditionally, and NF Habitat HQE rewards it at its maximum weighting.

The full comparison, with the exact wording used by each scheme, is on our page on certification requirements. On a building already in service the approach is called retro-commissioning and acts on settings and control logic; extended over time it becomes ongoing commissioning, which meets the French tertiary decree obligation from the operational side.

FAQ · commissioning in Toulon

What building owners ask.

No. No French building regulation requires it. It becomes binding by contract as soon as a project targets a label or certification: the Effinergie labels require it unconditionally, NF Habitat HQE rewards it at its maximum weighting, and LEED places it in a prerequisite. Many projects fall within scope without the subject having been addressed at the outset.
The pre-handover operations establish conformity of the delivered works and produce the snagging list, at the end of construction. Commissioning starts at briefing stage and continues through the first year of operation. And the contractor's own set-up work belongs to the contractor alone: commissioning verifies that it was properly done without substituting itself for it.
It depends on the level targeted. Assigning the role to the design team is the simplest route, but that team then verifies its own design, and the most demanding schemes exclude it: BBCA requires a third party, DGNB requires a party that is neither designer nor contractor, and LEED version 5 removed the exemption for smaller projects. We say plainly when our own position on a project prevents us from taking the role.
More than on new build, in fact. A refurbishment starts from uncertain input data — service condition, wall make-up, undocumented modifications — so its energy model rests on more fragile assumptions. Commissioning does not require the model to have been right: it verifies the result obtained. That is also why the assignment opens with something new build never involves, namely establishing a reference condition of the existing building before works.
Yes, and it is the most frequent situation in housing refurbishment and across public estates. It requires commissioning in phases, on installations partly in service, with tests that do not mobilise the whole building at once. The constraint is real but it can be planned: what costs money is discovering it mid-contract.

Go further

Commissioning across Provence-Alpes-Côte d'Azur.

A project to commission in Toulon?

We scope the assignment at the level your scheme actually requires, at the right point in the programme, and we say plainly when an independent third party is needed.

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