Space audit and diagnosis: identifying the challenges before fitting out
3 structuring tensions to arbitrate before any space diagnostic
A 40% median gap between declared and measured occupancy: a space audit is not an inventory, it is an act of real estate governance. NF X 35-102:1998 sets a minimum of 10 m² per workstation, but no standard requires measuring actual usage before fitting out. The result: 1 in 3 office floors is sized on managerial declarations. The Kytom methodology unfolds across 4 phases over 8 weeks (technical survey, usage observation, user survey, forward-looking synthesis), reduced to 5 weeks in an integrated Design & Build approach. An instrumented audit almost always reveals optimisation levers that internal teams had not identified. Auditing is not about counting empty workstations: the approach objectifies actual usage, qualifies technical constraints (HVAC, fire safety, accessibility) and confronts managerial perceptions with field practices. On Kytom projects, this upstream phase halves rework during design. Three tensions structure the reliability of the diagnostic, four survey biases weaken its conclusions, and four phases articulate a usable output.
Three trade-offs determine the value of an office audit and must be settled before the first measurement.
- Scope versus depth. Audit an entire portfolio or target critical zones? Across our recent portfolio, a selective audit covering 40% of the floor area captures the bulk of significant dysfunctions.
- Quantitative versus qualitative. Occupancy measurements (sensors, time-stamped readings) deliver facts, while interviews and focus groups reveal their causes. A balance close to 70/30 between objective data and qualitative material offers the best ratio between the insights produced and the cost of the assignment.
- Snapshot versus temporality. Photographing the existing situation is rarely enough: a usable diagnostic incorporates a projection over 3 years minimum (headcount, work patterns, real estate milestones).
Kytom’s position, against the grain of the profession’s orthodoxy. Common practice in facility management aims for an exhaustive diagnostic to secure the decision. Our reading differs: on the multi-site assignments we have led, exhaustiveness produces diminishing marginal returns beyond 40% of audited floor area, and delays the decision by 4 to 6 weeks. A targeted audit delivered quickly is better than a total audit delivered too late for the lease timeline.
Usable frameworks exist: NF X 35-102:1998 sets the minimum office area, the tertiary decree and the ADEME OPERAT platform frame the energy trajectories, and the ARSEG publications (Buzzy Ratios 2023) document the m²/workstation ratios of the French building stock.
When an in-depth audit is not justified. Below 800 m² or 60 workstations, a full 4-phase audit proves disproportionate: the cost of the sensor phase exceeds the expected gain, and a simple 2-week occupancy reading combined with managerial interviews is sufficient. Likewise, a building stock already audited less than 24 months ago with no major organisational change only requires a targeted update, not a whole new sequence.
