Space audit and diagnosis: identifying the challenges before fitting out
3 structuring tensions to arbitrate before any space diagnosis
A 40% median gap between declared and measured occupancy: a space audit is not an inventory, it is an act of real estate governance. The former NF X35-102 standard recommended a minimum of 10 m² per person in individual or shared offices, but no standard requires measuring actual usage before fitting out. The result: 1 in 3 office floors is sized on managerial assumptions. The Kytom methodology unfolds across 4 phases over 8 weeks (technical assessment, usage observation, user survey, forward-looking synthesis), reduced to 5 weeks in integrated design and build. Every Kytom audit consistently reveals optimisation levers that internal teams had not identified, for lack of objective observation tools. Auditing is not about counting empty workstations: the approach objectifies actual usage, qualifies technical constraints (HVAC, fire safety, accessibility) and confronts managerial perceptions with on-the-ground practices. On Kytom projects, this upstream phase significantly reduces design rework. Three tensions structure the reliability of the diagnosis, four survey biases weaken its conclusions, four phases articulate a usable output.
Applicable frameworks exist: NF X 35-102:1998 sets the minimum office surface area, energy trajectories structure the reduction of office sector consumption, and the m²/workstation ratios of the French office stock are now widely documented.
4 survey biases that skew one audit in three
Four recurring errors compromise the value of a space diagnosis, regardless of the quality of the tools deployed.
- Auditing during an atypical period. July, long-weekend weeks, a reorganisation phase or transport strike days distort occupancy observations. A 4-week window outside school holidays remains the benchmark for ensuring the representativeness of observations.
- Neglecting inter-floor flows. Limiting the study to a single floor ignores vertical circulation, which concentrates a significant share of friction points in multi-level buildings.
- Surveying only the management line. Hierarchical perceptions often diverge from actual usage: a survey stratified by job function and seniority corrects this bias.
- Omitting technical constraints. HVAC, smoke extraction, accessibility (NF P 91-201, articles R4214 to R4217 of the applicable regulatory framework) condition the feasibility of scenarios.
The Kytom method integrates these 4 dimensions: behavioural audit over 4 rolling weeks, vertical flow mapping, stratified survey and technical pre-diagnosis. This approach significantly reduces design rework and extends the period over which the delivered fit-out remains relevant.
Explicit limitation. On a single-floor site of less than 1,500 m² with a homogeneous team (a single business unit), vertical flow mapping and the multi-function stratified survey lose their added value: a simplified 2-week protocol with direct interviews is sufficient, and the methodological enrichment becomes an extra cost with no analytical counterpart.
The Kytom methodology in 4 phases over 8 weeks
The audit sequence articulates technical production, observation and qualitative material, with intermediate deliverables.
| Phase | Duration | Expected output |
|---|---|---|
| 1. Technical assessment | 2 weeks | Structural constraints, networks, ERP/Labour Code compliance |
| 2. Usage observation | 4 weeks | Occupancy sensor data, peak-hour readings |
| 3. User survey | 1 week | Stratified survey, business-function focus groups |
| 4. Forward-looking synthesis | 1 week | 3-year scenarios, internal Kytom sector benchmark |
Phase 2 distinguishes occasional practices from structural trends. Cross-referencing phases 2/3 highlights significant gaps between perception and the reality of occupancy rates, a structural distortion frequently observed between sensor data and managerial assumptions. Phase 4 incorporates announced organisational changes and a benchmark drawn from projects delivered since 2006 by Kytom agencies, supplemented by 2023 sector ratios for perspective. The 8-week sequence can be reduced to 5 weeks in integrated design and build mode, with design starting on the first conclusions of phase 2.
When this method is not the right one. Beyond 15,000 m² or for a multi-site portfolio of more than 5 locations, the linear 8-week sequence becomes undersized: it is necessary to switch to a wave-based protocol (3 to 4 months with phasing by pilot site then rollout). Conversely, in a relocation context constrained to less than 12 weeks before the lease commitment, the full audit is no longer operational and must be replaced by an accelerated 3-week framing exercise.
For the CFO and the Asset Manager: what the audit is worth in cash flow and asset value
Reframed from a financial angle, a space audit is not a consulting expense but a CAPEX/OPEX trade-off that can be quantified.
Rent avoided per reallocated m². When the gap between declared and measured occupancy is significant, an audit that objectifies theoretical over-densification makes it possible to renegotiate the leased surface area at the three-year break or to sublet a floor. On a Paris rent of €550/m²/year, freeing up 600 m² represents €330,000 of avoided annual cash flow.
Reduced fit-out CAPEX. A programme sized on actual usage rather than on assumptions avoids financing 15 to 25% of furniture and parti
