A team doing quick status updates needs far less space per person than a team mapping out a complex workflow together. The type of work matters more than headcount alone when estimating how much surface area a room actually needs. The number of distinct topics being tracked at once also matters, since a single focused discussion needs less space than several parallel threads being mapped simultaneously. It is worth revisiting this estimate periodically as a team’s working style evolves, rather than treating the original figure as fixed indefinitely.

For planning and workshop-style sessions, allowing roughly half a metre of usable writing width per participant tends to avoid the board feeling cramped, though this varies with how visual the work actually is. This figure works best as a sanity check against a proposed size, rather than as a precise formula to design a room around from scratch. This figure tends to hold up best for teams whose sessions are broadly similar week to week, and needs more adjustment for teams whose work varies significantly between sessions. This also assumes reasonably open access to the board from a seated position, which itself depends on how the surrounding furniture is arranged. Applied to specific room types, this generally works out to roughly two metres of usable width for a 4-person project room, three to four metres for an 8-person workshop room, five to six metres for a 12-person strategy room, and considerably more for an open collaboration zone shared by several teams throughout the day.

Sessions involving multiple teams or a wide range of topics tend to need more space per person than a single team working on one focused task, simply because more distinct threads are being tracked at once. It is worth erring generously when a room regularly hosts visitors from other teams, since occasional larger sessions are usually the ones that reveal a board is undersized. Sessions that bring in participants unfamiliar with the room’s usual working style also tend to need more space, simply because more gets externalised onto the board rather than assumed as shared context.

An undersized board leads to premature erasing, content spilling onto the wall, or teams splitting work across multiple boards that were never meant to work together. These workarounds tend to appear within the first few sessions, which is often the first real signal the estimate was too tight. Once these workarounds become routine, they are often mistaken for how the room is simply meant to be used, rather than recognised as a sign the original sizing fell short. Reworking a room’s layout after the fact is considerably more disruptive than adjusting the original estimate before the board is ordered. Teams rarely trace these workarounds back to the original sizing decision, which is exactly why an undersized board can persist for years before anyone questions the root cause.

Estimating for an average session, rather than the busiest realistic one, is the most common reason a board ends up too small. Sizing for the busiest day the room is likely to see gives a more durable estimate over time. This does not mean sizing for a worst-case scenario that happens once a year, but for the kind of demanding session that occurs regularly enough to matter. This approach also tends to future-proof a room reasonably well, since teams generally grow their use of a well-sized board over time rather than needing progressively less space.

Per-person estimates are useful for avoiding an obviously undersized board, but they are a starting point rather than a precise formula. The type of work happening in the room ultimately matters more than any fixed number per person. Used this way, a rough estimate becomes a practical planning tool rather than an exact figure to defend, which is ultimately what it is meant to be. This kind of estimate works best as a living reference rather than a one-time calculation, revisited whenever the team’s size or working style shifts. Treated that way, it helps a room stay properly sized for its actual use, rather than for whatever assumptions were made when the board was first ordered.

See how Chameleon large dry erase boards can be sized to fit your team’s actual working patterns.