Office fit-out works: deliver with no surprises and no budget overruns
Keeping to budget does not rest solely on the rigour of the project manager: the fixed-price Design & Build contract transfers the execution risk to the contractor (French Civil Code art. 1793, lump-sum contract). Kytom coordinates, you deliver with peace of mind. Average lead time observed: 12 weeks for 850 m². A 6-step locked process, 1-, 2- and 10-year warranties (French Civil Code art. 1792 et seq.), Qualibat certification and ISO 9001 approach. Occupied site managed through phasing (zones of 100 to 200 m²) and staggered hours. This page details the regulatory framework, the execution process, the measured results and the contractual limits to weigh up before signing the works contract.
Fit-out works across 12 trades
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Drywall partitions for offices: acoustics, glazing, reversibility
You are partitioning an 850sqm floor and you are torn between genuine acoustic confidentiality, access to natural light and the ability to reorganise in three years’ time?…
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Tertiary access control: badges, biometrics, integrated BMS
Are you weighing biometrics against badges for your next floor plate, with the quote difference reaching 1500 euros excl. VAT per door? On the majority of tertiary sites we…
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Commercial floor coverings: 4 trade-offs that protect your asset
Most commercial flooring failures do not stem from the product itself, but from a UPEC trade-off poorly calibrated during the design phase. Flooring is not a finishing matter but…
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Removable and demountable partition walls for offices
Four reconfigurations over ten years: below this threshold, your removable partition costs 15 to 30% more than a plasterboard partition and will never pay for itself. Across 47…
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Special office partitions: smart glass, LED, greenery, screens
Are you hesitant to commit to a smart glass at 1800 EUR/sqm on a floor leased for 4 years? The answer is no, and we say so before quoting. Since 2006, Kytom has observed that the…
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IT network for office buildings
Cat. 6A cabling with a 90 m reach (NF EN 50173-2) remains the only infrastructure that pays off over a 9-year tertiary lease: fibre rolled out to every workstation costs 2 to 3…
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Commercial electrical distribution: 4 trade-offs that swing your budget
Under-sizing your floor’s subscribed power by 15% means exposing yourself to rework on the LV power lot costing between 40 and 60% of the initial budget, 18 months after…
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Specific electrical installations: 4 trade-offs that secure your next 15 years
An unplanned outage on a live rack costs you between 800 and 4000 EUR per hour of downtime, and 60% of these incidents stem from underestimating power supply constraints at the…
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Commercial doors: fire-rated, acoustic, security, wood and glazed
Over-specifying a fire door beyond the regulatory requirement (EI 60 where NF EN 1634-1 and Labour Code R4216 require EI 30) increases the budget by 20 to 25% with no insurance…
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Commercial lighting: design, control, save
500 lux at the workstation, not 750: over-lighting an open space costs 12 to 18 EUR/m²/year for zero visual gain. NF EN 12464-1 (2021 edition) sets 500 lux for standard office…
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Mobile office walls: accordion, track, Japanese partitions
Do you reconfigure your meeting rooms one to four times a week and does your floor plate exceed 200 m²? The mobile wall becomes cost-effective; below that threshold it costs you…
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Tertiary shading: blinds, brise-soleil, technical curtains
On a south-west facade fitted with solar control glazing alone, your occupants still endure 30% of solar gains at peak summer, and your chillers run at full load from 2 PM. An…
Regulations and budget for a commercial fit-out
Commercial fit-out works fall under three structuring bodies of regulation. The French Labour Code (articles R4214 et seq.) governs ventilation, lighting and workstation ergonomics. The ERP (public-access building) regulations apply when the site receives the public. The tertiary decree (commercial eco-energy scheme, OPERAT platform run by ADEME) requires a 40% reduction in energy consumption by 2030 for commercial buildings of more than 1,000 m².
On the budget side, the ARSEG Buzzy Ratios 2023 observatory puts the cost of a complete fit-out between 800 and 1,500 €/m² excluding furniture, depending on the level of specification. For an 850 m² floor plate (average Kytom area 2022-2024), the works budget represents between 680,000 € and 1.3 M€.
The contractual model, a lever to protect cash flow
For the CFO: the real issue is not the €/m², it is the contractual model. Article 1793 of the French Civil Code (lump-sum contract) fixes the price except for a written modification by the client: it is this, and not the technical specifications, that protects cash flow. In a separate-contract arrangement (independent trade packages, client-managed coordination), 8 to 15% of cost overruns land on the client’s operating account. In fixed-price Design & Build, they land on the contractor. For the Asset Manager, the stakes add up differently: a 12-week overrun on delivery = the standard period of rent-free avoidance not received, i.e. on the average area at 350 €/m²/year around 86,000 € of deferred cash flow.
The stakes beyond spend
The stakes go beyond spend:
- a poorly coordinated site on occupied premises: measurable loss of productivity, HR complaints, schedule slippage;
- absence of a prevention plan: criminal liability for the client (French Labour Code R4511);
- incomplete as-built file: degraded building operation for 5 to 10 years.
Why locked-down technical specifications do not protect you
Kytom’s position, contrary to the doctrine of procurement departments. The dominant practice is to put 4 to 6 general contractors into competition on very detailed technical specifications, believing that the precision of the brief protects against overruns. Our reading, after 68 projects: it is the opposite. The more the specifications are locked onto fixed technical solutions, the more the contractor’s constructive variants are constrained and the more change orders explode during execution. Performance-based specifications (acoustic, thermal and lighting targets in lux) with freedom of means statistically generate fewer change orders than means-based specifications. The fixed-price Design & Build contract loses its value below 200 m² (structuring costs > savings) and above 5,000 m² with phasing > 9 months (better to opt for a separate-contractors arrangement with a dedicated coordinator).
