What Is the Ideal Ratio of Open-Plan Desks to Private Breakout Spaces?

2 days ago

4 min read

Open-plan offices fail in a predictable way. Everyone sits together, which is great for collaboration, until someone needs to take a call, concentrate on a report, or have a private conversation and there's nowhere to go. The fix is private and semi-private breakout space, but how much is enough?

There's no single ideal ratio, and be wary of anyone who gives you one number. What works is a starting range that you adjust to how your team actually works. Here's how to find it.

Open-plan office with rows of desks, acoustic phone booths, a small focus room, and a lounge breakout area, designed by Kita Design Co. in Jakarta.

First, Define "Breakout Space"

The term covers several different spaces, and each needs its own ratio.

Space type	Purpose	Typical size
Phone booth	One person, calls and video meetings	About 1.5 to 2 sqm
Focus room	One or two people, deep work	About 3 to 5 sqm
Small meeting room	2 to 4 people, private conversations	About 6 to 10 sqm
Medium or large meeting room	Team meetings, workshops, client visits	About 12 to 40 sqm
Informal breakout or lounge	Semi-private chats, casual collaboration	Varies

Sizes are rough rules of thumb and vary with furniture and design.

Starting Ratios (Rules of Thumb)

These are common starting points, not standards. Treat them as a first draft to test.

Space type	Starting ratio	Notes
Phone booths or focus rooms (combined, for solo private work)	About 1 per 6 to 12 desks	Lower end for call-heavy teams
Small meeting rooms (2 to 4 people)	About 1 per 8 to 15 desks	Often the most in demand
Medium and large meeting rooms	About 1 per 15 to 30 desks	Depends on how often big groups meet
Informal breakout and lounge seats	Roughly 1 seat per 4 to 8 desks	Includes pantry or cafe seating

As a simple summary, many modern offices land at roughly one private or semi-private space for every 4 to 8 desks once all the types above are counted together, but the mix matters more than the total.

What Changes the Ratio

How call-heavy the work is. Sales, customer support, recruitment, and client-facing roles need many more phone booths and small rooms than teams who rarely speak on calls.

How much deep focus is needed. Engineering, design, finance, and analysis often need quiet. Provide more focus rooms, and consider quiet zones within the open-plan area.

Confidentiality. HR, legal, finance, and management conversations need truly private rooms. Glass-fronted rooms with no sound isolation are not private.

Hybrid attendance. If people come in mainly to collaborate, you may need fewer desks and more meeting and breakout space. Compare desks to peak attendance, not headcount.

Meeting culture. A team that holds many video calls with remote colleagues needs more bookable rooms than one that meets rarely.

Office size and layout. A small office cannot support many dedicated rooms, so choose multi-purpose spaces. A large office can specialise.

Local culture and needs. Many Indonesian offices also plan for a prayer room (musholla) and other amenity spaces, which are separate from this ratio.

Match the Ratio to Your Office Type

Office type	Likely direction
Call centre or sales floor	More phone booths and small rooms, with acoustic control
Creative or tech studio	More focus rooms, plus informal collaboration areas
Professional services (law, finance, consulting)	More private rooms and small meeting rooms
Hybrid, collaboration-led office	Fewer desks, more meeting and breakout space
Small start-up	A few flexible rooms that serve several purposes

How to Test Your Ratio Before You Build

Survey the team. Ask how often people take calls, need quiet, or hold private conversations.
Track current use. Look at booking data, or observe how often people leave their desk to find a private spot.
Run a peak-hour scenario. Imagine the busiest day. How many people want a private space at once? A rough rule is that around 10 to 20 percent of people may want one at peak, but test this against your own team.
Pilot with temporary or movable booths if you're unsure, and measure the use before committing to built rooms.
Plan for adjustment. Choose flexible, modular booths or rooms that can be added or reconfigured.

Signs You Have Too Few Private Spaces

People take calls in corridors, stairwells, or on the street.
Rooms are permanently booked, and people book them "just in case."
Staff wear headphones all day to block noise.
Sensitive conversations happen in open view.
Complaints about noise and interruptions.

Signs You Have Too Many

Rooms sit empty most of the day.
The open-plan area feels crowded while private rooms are half used.
Small rooms are being used as storage or as informal desks.
You're paying for floor area that doesn't match actual use.

Design Tips That Make Any Ratio Work

Spread private spaces around the floor so nobody has to walk far to reach one.
Control sound properly. Acoustic booths, absorptive ceilings, soft furnishings, and sound-rated walls matter more than glass walls and good intentions.
Provide ventilation and lighting in small rooms. A booth with poor airflow quickly becomes unusable in Jakarta's climate.
Make booking simple, with clear signs showing whether a room is free.
Set etiquette, such as a booking limit and no camping in focus rooms.
Use varied sizes. A mix of one-, two-, four-, and six-person rooms uses space better than identical rooms.
Add quiet zones in the open-plan area, so not every request for peace becomes a request for a room.

Common Mistakes

Copying a ratio from a benchmark without checking how your team works.
Building meeting rooms that are too large and too few small ones.
Using glass-fronted rooms for confidential conversations without acoustic treatment.
Planning private space for headcount instead of peak attendance.
Not leaving room to add booths later.
Treating breakout space as a nice-to-have and cutting it when the budget gets tight.

The Bottom Line

A reasonable starting point is roughly one private or semi-private space for every 4 to 8 desks, with phone booths and focus rooms leading, small meeting rooms close behind, and larger rooms and lounge areas in smaller numbers. Then adjust to your call volume, focus needs, confidentiality needs, and hybrid attendance, and test the plan against a peak day. The right ratio is the one your team can actually use, with no one hunting for a place to think.

Kita Design Co. (PT Kita Desain Bersama) is a Jakarta-based commercial interior design and build studio working across F&B, retail, clinics, wellness, offices, and sports & fitness spaces. Planning an office? Get in touch at www.kitadesign.co.