Industrial units and warehouses 2026: classified installations, workplaces and construction

An industrial unit employing workers falls under the labour code's provisions on places of work. That regime is distinct from the public-building one: workers are professionals trained in evacuation, which justifies slightly different requirements — no mandatory emergency lighting below certain occupancies, a simple audible alarm in small establishments.

If the unit receives the public — customers in a showroom, visitors at an event — it becomes a building open to the public for the part accessible to them, while remaining a workplace for its working areas. That dual qualification is frequent in large do-it-yourself stores, showrooms and exhibition spaces. The public-building regulation then applies to the areas open to the public.

As soon as an activity reaches the quantitative thresholds of the national nomenclature, the installation becomes a classified installation for environmental protection. Classification rests on two criteria: the substances used or stored — solvents, chemicals, gases, fuels — and the type of activity, such as food processing, metalworking or surface treatment. Each heading of the nomenclature carries a four-digit number.

Indicative table; consult the official nomenclature on the environment ministry's site for current values.

For buildings whose highest floor sits less than 8 m above ground, the requirements are: escape routes sized to the occupancy; water-spray extinguishers, one per 200 m² with at least one per level; an audible alarm heard at every point; and emergency exits discharging directly outside or into a protected corridor.

Above 8 m to the highest floor, the requirements intensify significantly. The load-bearing structure must resist fire: columns and beams must achieve at least R 60. Intermediate floors must be REI 60. Compartmentation — between storage cells above 300 m², and around high-risk rooms — must be REI 60 with EI 30 doors.

Smoke control is mandatory for rooms above 300 m² at ground or upper level, rooms above 100 m² in a basement, and windowless rooms above 100 m². Natural smoke control is the economical reference solution for tall storage cells: roof vents allow smoke to escape by thermal buoyancy. The effective area of the vents is calculated from the technical instruction: for rooms below 1,000 m², the effective area equals the floor area divided by 200.

Rooms considered high risk in workplaces above 8 m must achieve at least REI 60. They include air handling plant rooms, generator rooms, high- and low-voltage substations, archives and stores, stores of more than 150 litres of flammable liquid, and large kitchens with a total cooking capacity above 20 kW.

Declaration is the lightest regime, applicable to installations with limited nuisance. It is an administrative formality with the prefecture, without prior determination. Registration, the intermediate regime, applies to warehouses between certain thresholds and to moderate-risk activities, with determination by the prefecture taking around five months. Authorisation is the most demanding regime, for installations presenting high environmental or health risks. Determination is long, 12 to 18 months, with a public inquiry and a prefectural order setting conditions.

An installation subject to authorisation or registration cannot start work before the classified installations receipt is issued. In practice the classified timescale — 12 to 18 months for an authorisation — can far exceed the planning determination of three to five months. The classified application must therefore be filed ahead of, or in parallel with, the planning application, on pain of blocking the start of construction.

The covered warehouse heading is the most common in logistics. It covers the storage of every category of goods, except dangerous substances with their own headings. A warehouse above 500 m², or whose storage height exceeds 8 m, falls under declaration. Above 50,000 m³ of stored volume, registration applies. The technical conditions notably require sprinklers for warehouses above 3,000 m², separation into storage cells of at most 6,000 m², and REI 240 separating walls between cells.

ℹ Major constructional constraints for a classified warehouse Storage cells: a maximum of 6,000 m² separated by REI 240 walls, four hours. Sprinklers mandatory above 3,000 m² of cell area. A containment sump with a volume of at least 100 % of the largest liquid store or 20 % of total capacity. Separation from neighbouring buildings: a distance set by the risk level, often 10 to 20 m. These requirements raise the construction cost by 15 to 35 % against a simple unclassified warehouse.

Workplaces must be accessible to disabled workers. That obligation flows from the 2005 act and the labour code. Unlike buildings open to the public, there is no quota or simplified derogation: the principle is complete accessibility of every working area. In practice at least one accessible workstation is required, but the whole of the internal circulation, the changing rooms and the sanitary accommodation must be accessible.

Accessible sanitary accommodation is mandatory: at least one accessible WC for staff, with a 150 cm turning space, a grab rail and a pan at an accessible height. The width of aisles between racking in a warehouse is not specified in the accessibility rules, but the labour code fixes minimum escape widths according to occupancy.

The environmental regulations have applied to new commercial buildings since 1 July 2022 for offices, with progressive extension to other uses. For pure storage warehouses with no significant commercial activity, applicability depends on how the use is defined in the regulatory nomenclature.

ℹ The environmental regulations and logistics warehouses A pure storage warehouse, with no offices and no reception area, falls in the warehouses and industrial buildings use, covered by a specific order. Where the warehouse includes a significant office zone above 20 % of the area, the commercial regime applies to that zone. Insulation of the opaque envelope — roof, walls — remains regulated by the existing-buildings or earlier thermal standard according to the date of the application. LED lighting is almost systematically specified by clients for economic reasons, independently of any regulatory obligation.

Industrial units and warehouses are built in the economic zones of the local plan or in dedicated development zones. The rules for those zones set specific requirements: maximum building height, often 12 to 15 m excluding the ridge; external appearance, cladding and colours; site coverage; set-back from roads and boundaries; and mandatory parking, generally one space per 100 m² of storage or one per five employees.

Planning permission is mandatory for any new construction. If the unit requires classified installations authorisation, that application is filed independently, determined in parallel but separately. Receipt of the classified installations acknowledgement is a condition precedent to starting work, but not to filing the planning application.

ℹ ✔ Summary for the economist Identify the applicable classified regime from the concept stage: heading, thresholds, regime. For an authorisation, anticipate 12 to 18 months of determination before work starts. A simple unclassified warehouse below 8 m: 310–610 €/m² of floor area, excluding external works. A classified warehouse with sprinklers: an additional 40–80 € excl. VAT per m² of cell. REI 240 cell separations: a significant structural premium where there are many cells. Do not neglect the external works and roads for heavy goods vehicles: 30–80 €/m² of site area.

Workplace fire regulation is developed in the fire safety article. The planning article explains the rules for economic zones and the determination periods. The office article covers workplaces with public reception and the commercial environmental regime. The classified installations regime is mentioned in the public-building article for shops with a classified activity.

ℹ The construction economist on demand. Warehouse, industrial unit, classified installation: the technical regulation is dense. Quostra prices your programme with the workplace fire constraints, the classified premiums and the commercial environmental requirements built in.

Reference basis of the figures

The ratios per square metre and per item on this page are stated in January 2026 values. They were updated from January 2025 values, the basis adopted for the whole cocoon, using the BT01 all-trades index published monthly by INSEE on its 2010 base: 132.0 in January 2025, 134.7 in January 2026, a coefficient of 1.0205.

The global amounts quoted as examples, and any rents, charges or receipts expressed per year or per night, remain on their own basis: a building cost index does not apply to them.

To bring the ratios forward, apply the usual revision formula: updated value = page value × (BT01 for the month in question / 134.7). The BT01 measures contractors' input costs, labour at 44.9 % and materials at 36.5 %, not the prices actually tendered.

• Construction regulations in France