Open Plan vs Cabins: What Each Layout Costs You Beyond the Fit-Out

Reframing the question

Leadership teams usually debate this as a culture question — open plan for collaboration, cabins for hierarchy and focus.

The planning reality is more concrete. Every enclosed room takes area, blocks daylight, adds services and changes the compliance picture. Every open desk saves area and light but has no acoustic privacy. The useful discussion is about how many enclosed rooms the floor genuinely needs, of what size, and where they sit.

Side by side

Factor	Open plan	Cabin-led
Area per person	Lower	Higher
Daylight reach into the floor	Good	Blocked, especially at the facade
Acoustic privacy	Poor without support spaces	Good
Services cost	Lower	Higher — air, lighting, detection per room
Reconfiguration	Easy	Partitions must be moved or demolished
Sense of status	Flat	Explicit
Suits	Collaborative, changing teams	Confidential work, fixed structure
Fire and escape implications	Simpler	Must be re-checked for subdivision
Growth headroom	Absorbs additional desks	Fixed room count

Where the cabin cost really lands

A cabin looks like a partition and a door. On a fit-out budget it is:

• The partition, door and ironmongery
• Its own supply air and a return path
• A lighting circuit, switching and controls
• Ceiling grid adaptation, diffuser relocation, sprinkler and detector changes
• The circulation needed to reach it
• The daylight it removes from everyone behind it

That is why the cost difference between a layout with six cabins and one with sixteen is much larger than six versus sixteen partitions.

Daylight is the decision most often made backwards

The instinct is to give the best light to the most senior people, which puts cabins along the facade.

The consequence is that daylight stops at that line, and the open floor behind runs on artificial light all day. This affects how the office feels more than almost any other planning decision, and it works against the lighting and control provisions of ECBC 2017, where daylight-linked control depends on daylight actually reaching the space.

Two workable alternatives: put enclosed rooms toward the core, or glaze them so light passes through. Interior illumination practice is covered in IS 3646, and the design should be set with the lighting consultant.

Open plan fails without support spaces

The complaint about open plan is almost always a complaint about the absence of somewhere else to go.

A floor that provides enclosed meeting rooms in several sizes, a few focus rooms, phone booths for calls, and absorbent surfaces performs entirely differently from an open floor with nothing but desks. ISO 3382-3 addresses measurement of acoustic conditions in open-plan offices, and the practical levers are the ceiling, the floor finish, screens and the distance between speaking positions.

Budget the support spaces as part of choosing open plan, not as an afterthought when complaints start.

Mistakes that cost real money

• Fixing the layout before compliance is checked. Subdivision changes escape and detection arrangements; it is cheap to solve on a drawing and expensive after ceilings close.
• Cabins along the entire facade. The whole floor behind them loses daylight.
• Open plan with no quiet rooms. Guarantees the complaint the layout was supposed to avoid.
• Counting seats in MEP and circulation zones. Produces a headline seat number that collapses when the services layout is coordinated.
• Planning for today's headcount only. A layout with no growth allowance forces a reconfiguration within the same lease.
• Deciding room sizes without testing them on the actual plan. Standard allowances rarely survive contact with a real floor plate and core position.

Standards referenced

Fire and life safety, including occupancy, exits and travel distance, in NBC 2016, Part 4; lighting and control provisions in ECBC 2017; interior illumination practice in IS 3646; open-plan acoustic measurement in ISO 3382-3. Escape arrangements, occupancy assessment and detection layout for a specific floor must be determined by the project's fire consultant and the authority having jurisdiction.