Office standards and regulations: the Kytom operational guide

Four cumulative foundations determine the regulatory admissibility of a tertiary project. None replaces another, and they must be read together before any plan is set.

• Occupational health and safety framework (articles R4214-1 to R4228-37): 200 to 500 lux depending on the tasks (NF EN 12464-1), 25 m³/h/occupant in a non-smoking office (R4222-6), separate toilets by gender (R4228-10).
• ERP regulations: five categories according to occupancy, smoke extraction, emergency exits sized in passage units. Article R.4227-5 limits to 100 people per floor a level served by a single staircase of 1.40 to 1.50 m.
• Accessibility for people with reduced mobility: law of 11 February 2005, order of 8 December 2014, main circulation routes of 1.40 m, adapted toilets, signage compliant with RGAA 4.1.
• Tertiary decree: applicable to buildings of more than 1000 m², annual declaration, trajectory of -40% in final energy consumption by 2030, -50% by 2040, -60% by 2050.

In concrete terms at Kytom, on the BREEAM-certified assets we have delivered in recent years, we measure a valuation appreciably above the market. But this premium is entirely cancelled out if the tertiary decree is not met. Certification is a multiplier, never a foundation.

Compliance is rarely reviewed as a financial matter. Yet it is one entirely, and three lines of your P&L are directly exposed.

• Immediate OPEX: a fine capped at 1500 EUR per breach and per employee (L4741-1), i.e. 75000 EUR for a 50-workstation floor with multiple breaches found by the labour inspectorate.
• Deferred CAPEX: a refusal of the completion certificate by the Control Office requires rework whose cost varies significantly according to the age of the building and the extent of the non-conformities found.
• Asset value: a discount observed on tertiary assets outside the energy consumption reduction trajectory, with a knock-on effect on the resale yield.

The sizing values to anchor from the very first sketch:

On the floors we review, toilets generally occupy 3 to 5% of the usable area, with separation by gender (R4228-10) and one toilet per 10 people as a sizing rule.

The maximum capacity of a floor is set according to the passage units of the exits. A single staircase of 1.40 to 1.50 m allows a maximum of 100 people per floor. Beyond that, a second staircase becomes mandatory, a structural constraint that is often decisive in the renovation of older buildings: creating a stairwell opening in a Haussmann-era floor slab involves structural studies, demolition and underpinning, i.e. several additional weeks of work.

The smoke extraction of horizontal circulation routes falls under the ERP regulations in force, with natural openings or mechanical systems. The CSSI mission (Fire Safety System Coordination) becomes mandatory for category A and B fire safety systems.

Health and safety coordination secures the works throughout the project, from the preparatory phase to handover. The safety register, the DOE and the DIUO complete the documentary set required at handover. We incorporate these deliverables into a single compliance file handed over to the project owner, accompanied by the certificates of the companies involved.

Honestly, not everyone needs this: for a single floor of fewer than 50 occupants in a 5th-category ERP without an A/B fire safety system, a simplified safety file is sufficient. The full CSSI mission then generates an additional cost of 3 to 6 k EUR with no regulatory benefit. We tell you so in the initial audit.

Three recurring configurations call for a systematic diagnosis before any budget commitment.

• Overlapping references: an office classified as a 5th-category ERP combines several regulatory frameworks (occupational safety, ERP regulations, accessibility for people with reduced mobility and sometimes ICPE), which appreciably lengthens approval times.
• Older buildings and staircase openings: as soon as a floor exceeds 100 occupants, the second staircase requires structural rework whose cost can reach 450 EUR/m² in a Haussmann-era building.
• Regulatory obligations and certifications: an environmental or quality-of-use certification never exempts you from the regulatory obligations applicable to the tertiary sector. A displayed certification does not avoid the discount if the -40% trajectory by 2030 is not documented.

We review these three areas in the initial audit, before any plan is submitted. You make your CAPEX decisions with quantified visibility on the regulatory consequences of each option.

1. Initial standards audit
   Within two weeks, our technical leads map the applicable references (labour regulations articles R4214 to R4228, ERP fire safety, accessibility for people with reduced mobility law of 2005, tertiary sector energy consumption reduction obligations, ICPE if relevant) and identify the existing gaps. You receive a quantified gap note, line by line, with a CAPEX estimate for bringing things into compliance.
2. Compliant programming
   We translate the requirements into enforceable project data: 10 m² minimum per workstation, one toilet per 10 people (R4228-10), one emergency exit per 50 occupants, 25 m³/h/occupant (R4222-6). These values lock the sketch before any detailed plan is set.
3. Validated regulatory design
   The integration of ERP, accessibility and energy performance takes place from the sketch stage, with continuous validation by an approved Control Office. You avoid plan rework in the APD phase, i.e. 4 to 8 weeks saved on the overall schedule.
4. Secured site coordination
   Over an average of 12 weeks (47 Kytom projects 2022-2024), our health and safety coordinator (decree 94-1159) and the CSSI mission secure the works according to the references applicable to fire safety systems. A single point of contact manages the trades and guarantees documentary traceability through to handover.
5. Enforceable compliance file
   The final booklet brings together the DOE, the DIUO, the safety register and the certificates of the companies involved. This single file is enforceable against the Control Office, the labour inspectorate and the future buyer in the event of a sale, securing the asset value over the long term.