Cambridge: colleges, labs and listed risk

Seen from above, Cambridge looks deceptively calm. The river curls past a run of green college lawns, the courts and quadrangles sit in their walled enclosures, and the whole centre seems to belong to one quiet century. It does not. Compressed into that small footprint is an extraordinary range of building types, from medieval chapels and Georgian terraces to mid-century concrete and, ringing the edges, the glass-and-steel research buildings of one of the densest science clusters in the country. Each of those types carries a different management problem, and they sit close enough together that one organisation often has to handle all of them at once.

That mixture is what makes Cambridge interesting from a building-safety point of view. The compliance burden here is not defined by height alone. It is defined by variety, age and use, layered on top of one another in a small area.

Old fabric, modern duties

The historic colleges and the buildings around them are the obvious starting point. Much of central Cambridge is listed or sits within a conservation area, which constrains what can be altered and how. A listed building does not get a lighter set of safety duties because it is old; it gets a harder version of the same duties, because the obligation to keep people safe runs straight into the obligation to preserve fabric that cannot simply be cut into for a new riser or a modern compartment line.

Fire safety is where this tension bites hardest. The responsible person for these premises still owes a duty under the Regulatory Reform (Fire Safety) Order 2005, and the fire risk assessment must reflect the building as it actually is, timber stairs, concealed voids, irregular layouts and all. Older buildings rarely offer the clean compartmentation a modern design assumes, so the assessment has to work harder to understand how fire and smoke would actually move, and the management measures have to compensate for what the fabric cannot provide.

Laboratories and the hazards a home does not have

Around and within the academic estate sit laboratories, and they change the picture completely. A research building is not a residential block with desks; it can hold chemical stores, gas lines, specialist ventilation, sensitive equipment and processes that introduce hazards an ordinary fire risk assessment never has to consider. The people inside may be working with materials whose behaviour in a fire is the whole point of the risk assessment.

This is where Cambridge departs from a city defined by housing. The estate manager here is often juggling several regimes at once:

• Historic and listed fabric with limited scope for physical alteration.
• Laboratory and research space with process hazards and specialist services.
• Student residential accommodation with its own occupancy patterns and turnover.
• Newer commercial and office buildings on the science parks at the city's edge.

No single checklist covers all of that. What ties it together is the discipline of knowing, building by building, exactly what you are dealing with and what is outstanding against each one.

Where the higher-risk threshold does and does not bite

Cambridge is not a city of towers, and that shapes its obligations. England's higher-risk building regime under the Building Safety Act 2022 applies to buildings at least 18m tall or at least 7 storeys with at least 2 residential units, according to gov.uk, with the dutyholder being the Accountable Person. Much of historic Cambridge sits below that line, both because of its age and because planning has long protected the low skyline around the historic core.

That does not let those buildings off. It means the heavier registration, safety-case and BSR-facing duties fall on a smaller subset, mostly newer residential blocks, while the broad fire-safety duties under the Fire Safety Order apply across the estate regardless of height. A manager here has to be clear about which buildings cross the threshold and which do not, because the wrong assumption in either direction creates risk. We have written more generally about building safety beyond the higher-risk threshold, and Cambridge is a good illustration of why that distinction matters in practice.

The case for one source of truth across a varied estate

The real challenge in Cambridge is not any single building. It is the number of different building types under common stewardship, each with its own assessments, certificates, inspection cadences and constraints. A college, a research institute or a property team can find itself responsible for a medieval chapel, a 1960s laboratory and a new student block on the same compliance calendar, with no two of them sharing the same risk profile.

Managed in scattered files, that variety becomes unmanageable, because the manager has to hold every building's particular rules in their head. Held in one place, where each building carries its own assessments, plans and outstanding actions against a shared structure, the variety becomes legible. The manager can see at a glance which laboratory has an overdue check, which listed building's fire risk assessment is due for review, which residential block crosses the higher-risk threshold and needs the heavier regime. This is the argument for keeping the whole estate on one footing, with a compliance calendar that does not care whether a building is six hundred years old or six.

A short, practical close

Cambridge's lesson is that risk does not scale with height. A small, low city can carry as demanding a compliance load as a forest of towers, because the difficulty here is variety: listed fabric, laboratory hazards, student accommodation and new commercial space, often under one roof of responsibility. The estates that cope are the ones that treat each building as a distinct item with its own profile while holding them all in a single, navigable record. SAMRISK is built for exactly that kind of mixed estate, where no two buildings are quite alike and all of them still have to be proven safe. This is general commentary rather than building-specific advice, and any particular building should be assessed by competent people against its own circumstances.