Can your building pass the summer test?

Imagine a meeting room at three o’clock on a bright July afternoon. The windows look impressive. The view is excellent. Everyone has quietly moved to the same side of the table.

The building is open. The room is bookable. Technically, nothing has stopped working.

Yet the space is failing at the ordinary thing it was meant to do: letting people spend time together comfortably enough to get something done.

For UK property owners and facilities teams, summer comfort deserves to move out of the category of occasional complaint. It belongs in a bigger conversation about whether a building remains useful as conditions change.

Summer is part of the brief

The Met Office described summer 2026 as provisionally the UK’s hottest on record. Its account also puts that season in the context of projected future warming. The provisional qualification matters; the direction of the challenge does not depend on one record surviving forever. Met Office summer assessment.

A national weather record cannot tell a manager which room will become uncomfortable first. Orientation, glazing, occupancy, equipment and the way the building is operated all shape the local experience.

That is what makes this an interesting property question. Two spaces on the same street can offer very different afternoons. Within one building, the desirable corner office may become the room people avoid.

We are accustomed to asking whether a property is warm enough in winter. A building needs to earn its usefulness in summer too.

The first question is where the heat comes from

Buying more cooling is an understandable response to a hot room. Sometimes it is also a necessary one. But it helps to understand what the proposed system will be fighting.

CIBSE’s 2026 advice describes a sequence: reduce heat entering the building, remove accumulated heat where possible, and use mechanical cooling where other measures are insufficient. It discusses shading, ventilation and reducing internal heat gains. That advice is directed at residents and homeowners; commercial premises need assessment for their own uses and constraints. CIBSE’s practical explanation.

For a facilities team, this invites a more useful conversation than simply asking which unit has the largest cooling capacity.

Is the afternoon problem concentrated along an exposed façade? Has a room acquired more people or equipment than its original use anticipated? Are existing controls understood? Could planned window or roof works address summer performance at the same time?

Those questions do not produce a universal shopping list. They help define the problem before a solution becomes an expensive commitment.

An open window is not an operating strategy

A drawing can make ventilation look wonderfully simple. Real buildings come with neighbours, traffic, noise, security arrangements and people who leave at the end of a shift.

CIBSE’s overheating position statement explicitly identifies outdoor pollution, noise and security as constraints when assessing natural ventilation. It also stresses clear communication about the operation and maintenance of systems intended to manage overheating. CIBSE position statement.

Consider an imagined office where a cooling strategy depends on opening windows overnight. If the people responsible for closing the building cannot leave them open securely, the strategy exists on paper but not in practice.

The lesson is not that natural ventilation is unworkable. It is that a building strategy has to include the people who will operate it.

Someone needs to understand the controls. Someone needs to maintain movable parts. Tenants need to know what they can change and whom to contact when the arrangement does not work. These are ordinary operational details, and they can decide whether a carefully chosen intervention delivers its intended value.

Do not turn comfort into a contest of endurance

Property discussions can become oddly moral about cooling: one side treats air conditioning as an automatic upgrade, while another treats needing it as a design failure.

Neither position helps the person trying to use the room.

A sensible brief leaves room for different responses in different spaces. A small meeting room used occasionally is not the same problem as accommodation occupied throughout the day and night. The needs of the people inside matter alongside the character of the building.

The Climate Change Committee’s briefing on overheating describes adaptation as a combination of measures, with implications for wellbeing and productivity as well as building performance. Its policy recommendations are recommendations, rather than a statement of current requirements. CCC overheating briefing.

For an owner, the practical ambition should be a usable building with an operating approach that can be sustained. That includes energy, maintenance, access and the actual experience of occupants. It should not depend on them tolerating an avoidable problem indefinitely.

The most useful moment may be the next ordinary project

Summer adaptation sounds like a separate capital programme. Sometimes major investment will be needed. In other cases, the next refurbishment creates a chance to ask better questions before choices are fixed.

A façade project, a change of tenant or a refit may already bring designers, managers and decision-makers into the same conversation. Summer conditions can become part of that brief instead of an issue discovered after the work is complete.

There are trade-offs. Shading changes appearance and daylight. Equipment occupies space and needs servicing. A measure that suits one elevation may be unnecessary on another. Heritage, leases and the needs of different occupiers can complicate decisions.

Those complications are reasons to start early, while there is still room to compare options. They are also reasons to bring the facilities team into the discussion before the specification becomes a finished answer.

Back in the meeting room, success would be fairly unremarkable. People would sit where the conversation works best, rather than where the sun is least troublesome. The room would quietly recover its purpose.

That is a good summer test for a property: can the people inside still do what they came there to do?