The School Design and Specifications Brief: What an Architect Needs Before Drawing Anything

by Greg Parry | Sep 20, 2026

Before an architect draws anything, somebody has to decide what the building is for. That decision is written down as a school design and specifications brief: a room by room statement of what the school needs, how many of each space, how large each one is, what has to sit next to what, and which regulations govern it. An architect who is given a plot, a budget and a student number will produce a building. Whether it is a school that can be run at a profit depends on the brief they were given first.

The brief is an operator’s document before it is a designer’s. It comes from the curriculum, the class sizes, the staffing model and the fee level, and each of those is a commercial decision made before the design starts.

Start with the roll, the curriculum and the class size

Every number in the brief follows from three things. The first is the target roll at capacity, set out year group by year group rather than as a single total. The second is the curriculum, since what a school teaches determines which specialist rooms it must have. The third is the class size the business plan assumes, which is usually the number that decides whether the school works financially.

Multiply the year groups by the forms of entry and the class size, and the general classroom count falls out. It is worth doing this on a spreadsheet, because the sensitivity is easy to miss in a meeting. Moving a class size by two or three students changes the number of classrooms, and each classroom carries its share of circulation, toilets and structure with it.

Build the roll in phases as well as at capacity. A school that opens with two forms of entry and grows to four needs a brief that shows both states, so that the architect can design for the end point and the owner can build towards it.

Do not assume every room is full every period

That multiplication gives the nominal capacity of the building, which is the number of seats it contains. Investors tend to read it as the number of students the school will hold, and how close that is to the truth depends entirely on which part of the school is being counted.

Primary is the straightforward case. Each class has a home room and a class teacher who takes most of the timetable, supported by specialists in physical education, music and languages who teach across the year groups. The home rooms fill to their class size, and only the specialist spaces carry any utilisation question at all.

Middle school sits between the two. Subjects are grouped into faculties, with mathematics and science taught together and the humanities together, and students move around a smaller number of teaching bases. Classes are still largely taught as whole groups, so the rooms remain close to full, and the specialist provision starts to grow.

Secondary is where the assumption breaks. Almost everything is a choice, taught by a subject specialist in a room equipped for that subject. A credible school has to offer breadth, and students select from option blocks that nobody can predict from one year to the next. A language runs with twenty-four students one year and nine the next, while a science pathway that was undersubscribed suddenly needs a second group. The rooms and the teachers have to exist for the whole range on offer, and only some of them are fully used in any given year.

The practical effect is that a secondary school rarely operates above about eighty-five per cent of the seats it contains. A building counted at a thousand secondary places will in practice run at somewhere near eight hundred and fifty students, and that is a permanent condition of offering choice rather than a problem that gets solved as the school matures.

The brief should therefore state nominal capacity and working capacity as two separate figures, with the assumption behind the second one written down. The alternative is a business plan built on the first figure, which overstates fee income by roughly the same margin for every year of the model.

Fix the curriculum before the design starts

A surprising number of schools are designed before anyone has decided what will be taught in them. The plot is acquired, a student number is agreed, an architect is appointed, and the curriculum is settled somewhere during the construction programme. The building that results is a generic set of classrooms, and the school then spends years working around it.

The differences between curricula reach into the structure of the building. An IB school needs more laboratory provision than a comparable school following a curriculum with fewer compulsory science pathways, and it needs somewhere to run the extended essay, personal project and collaborative work that the programme requires. Those activities do not fit a room designed for a teacher at the front and students in rows.

The same programme changes what a corridor is for. Where collaboration is part of how students are assessed, circulation space has to be wide enough to hold groups working outside the classroom, with power, seating and display, so corridors become shared learning areas rather than routes between rooms. Display matters in its own right, since publishing student work is how a school shows what it values, and wall space for it has to be planned in. None of this can be added once the structural grid is set and the corridor widths are fixed by a fire strategy.

Deciding the curriculum first also protects the accreditation timetable. Authorisation bodies inspect facilities, and a school that applies with rooms that were never designed for the programme is asking for conditions it could have avoided.

Let the curriculum decide the specialist rooms

Specialist provision is where briefs are most often wrong, because it is the part that cannot be reasoned from student numbers alone. A curriculum with examined sciences requires separate laboratories, and a chemistry laboratory usually requires a preparation room with its own exit. A curriculum with design and technology needs workshop space, extract and storage. Performing arts needs rooms that can make noise next to rooms that can tolerate it.

Regulators complicate this further, since most jurisdictions set minimum areas for teaching spaces, and some mandate rooms that a curriculum would not require on its own, along with ratios such as one laboratory per so many classrooms. The brief has to satisfy both the curriculum and the regulator, and where the two differ it takes the higher figure.

Where a subject is timetabled rather than taught continuously, the brief should say so. A room used four periods in five is a different proposition from one used two periods in five, and specialist rooms are the most expensive square metres in the building.

Specify for today and allow the mix to change later

The brief has to meet the specification at the point of approval, and it also has to survive a school whose shape changes. Demand moves in ways that are hard to predict five years out, and the early years are the least predictable part of any school. A market that fills three kindergarten classes in the first year may need four in the third and two by the seventh, with the pressure moving up into Grade 1 as those cohorts progress.

The answer is to design rooms that can change use without construction. Early years rooms carry requirements that general classrooms do not, including their own facilities and direct access to a protected outdoor area, so a room built to the early years standard can later serve a younger primary class while the reverse is expensive. Where the phases meet, keeping a common structural grid, matching services and non-structural partitions means the balance between kindergarten and Grade 1 can be adjusted over a summer rather than through a building contract.

The brief should say which rooms are intended to be convertible and to what, so the architect designs for it instead of discovering it later. It costs very little at brief stage and a great deal afterwards.

Settle the laboratory count before the drawings, because it will be disputed

Science laboratories are the most argued-over rooms in any school project. They are expensive to build, needing services, ventilation, fixed benching, preparation space and safety provision, and they are inflexible once built, since a room fitted out for chemistry makes a poor general classroom and a costly one. A developer looking for savings will find them here first.

A secondary school also earns much of its reputation in these rooms. Examined sciences cannot be taught properly without them, parents ask about them on tours, and a school that cannot timetable its practical work is visibly weaker than one that can. Regulators tend to agree, and most set a minimum ratio of laboratories to classrooms that the school has to meet regardless of what it would prefer.

The way to settle this is with arithmetic rather than opinion. Take the number of science periods each year group must have at capacity, divide by the periods available in the timetable cycle, and the required laboratory count falls out. That figure can then be tested against the regulatory minimum and against a sensible utilisation rate. A laboratory timetabled at nine periods in ten leaves no room for a growing roll, and one at four in ten is capital standing idle. Doing this at brief stage converts a matter of opinion into a number that an owner, an operator and an architect can all check.

Write in the rooms that get cut first

The spaces that disappear from a brief under cost pressure are the ones nobody counts as teaching. A school cannot operate without them, and retrofitting them is expensive.

The list is fairly consistent across projects, running to small rooms for intervention and learning support where students are taught in threes and fours, planning space for teachers that determines whether they prepare at school or at home, preparation rooms and stores next to the laboratories and workshops that need them, a medical room, counselling offices with discreet access, and rooms where a parent can be met privately, since admissions interviews and difficult conversations both have to happen somewhere. To those add a staff room sized to the number of staff the school will employ at capacity rather than at opening.

A room count that begins with classrooms will miss every one of them, and an inspection will not.

Storage is the one that is overlooked almost every time, and it is under planned even when it is remembered. A school generates far more material than a brief written around teaching spaces anticipates: equipment for physical education and performance, resources for every subject, furniture taken out of rooms and put back for examinations, seasonal and event material, cleaning and maintenance supplies, records that have to be kept, and the stock of consumables that a school of any size gets through in a year. Because none of it has a teaching function, it falls outside a room schedule built around teaching spaces.

What follows is familiar enough to anyone who has run a school. Corridors fill with cupboards, a classroom is given over to storage and stops earning its area, and circulation that a fire officer approved becomes a problem at the next inspection. The remedy is to write storage into the brief as its own line, distributed where it is needed rather than gathered into one basement room, with a share allocated to each department and to the spaces that generate most of it. Storage is also the cheapest area in the building to construct, which is the argument to use when it is questioned.

Remember that net area is not built area

The most common error in a client’s own calculation is to add up the rooms and treat the total as the size of the building. Corridors, stairs, lifts, walls, plant rooms, risers and service space are not in that total, and they are a large share of the finished floor area.

A workable brief states the net internal area for every space, then applies a gross-up for circulation, structure and plant to reach the built area. A third of the building sitting outside the room schedule is a reasonable planning assumption for a school, and an efficient design does better than an inefficient one. Getting this wrong at brief stage means a plot that looked adequate turns out not to be, which is discovered after the land has been bought, and the area a school needs is worked out this way round.

Outdoor space is handled separately from all of this. Courts, pitches, play areas and drop-off do not form part of the built area, and they compete with the building for the same plot. A brief that specifies both, and states which has priority when the plot is tight, prevents an argument later.

Say what has to be built first

A school that opens with two hundred students in a building designed for twelve hundred has a cash problem from the first day. The brief should therefore mark each space as required at opening, required by a stated enrolment level, or deferred to a later phase.

Some spaces have to exist at opening even though they are barely used, because a licence, an accreditation or a parent’s expectation requires them. Others can wait for several years without anyone noticing. The distinction is an operator’s judgement more than an architect’s, and it belongs in the brief because it determines the construction sequence and the drawdown of capital.

Treat the brief as the thing that gets signed

Once design work begins, the brief is the reference against which drawings are checked. Every later change has a cost that rises the further the design has progressed, and a room added after the structural drawings are complete is a different conversation from one added in week three.

That makes the review before sign-off worth real time from the operator, the owner and whoever will run the school. The most useful question to ask at that point is not whether the school looks good. It is whether this building can be staffed and timetabled at the fee the business plan assumes.

The building follows the model

A design and specifications brief is the point where the operating model becomes a building. The roll, the curriculum, the class size and the staffing plan all reach the architect through this document, and whatever is missing from it is missing from the school.

That is why the brief is written after the feasibility study and not before it. The feasibility work establishes what the school is, who it serves and what it can charge, and the brief turns those answers into rooms.

Explore the full library of international school business and leadership articles.