Phasing & Live Hospitals

Here is a fact that shapes an enormous share of real healthcare work: most hospital projects are not new buildings on empty land. They are extensions, refurbishments, upgrades and replacements grafted onto a hospital that is full of patients and cannot stop. A ward is added above a working department; an old wing is rebuilt while the one beside it treats the sick; a new tower rises on the last patch of a crowded urban site. The defining constraint is not the design of the new thing - it is keeping the old thing running, safely, throughout.

This changes everything about how you plan. A hospital cannot close for a refit the way a shop or an office can. Emergency care, surgery, intensive care, maternity - these run around the clock and cannot be paused. So construction has to be woven into a living organism without interrupting its vital functions, and the primary design problem becomes continuity: how do patients, staff, ambulances, supplies and waste keep moving, cleanly and separately, while part of their building is a construction site?

> On a live hospital you are not just building the new - you are protecting the old, hour by hour, from everything your construction throws at it.

The forces you are protecting the working hospital from are concrete: dust (which carries infection), noise and vibration (which disturb recovery, imaging and surgery), interruptions to power, water, medical gases and IT (any of which can be life-threatening), blocked or diverted routes (which can slow an emergency), and the simple loss of beds and rooms while they are out of use. None of this is incidental. On a live hospital, the construction methodology is a clinical-safety matter, agreed with the hospital's clinical and infection-control leadership before work begins, and it often costs more and takes longer than building on a clear site - a reality that must be in the programme and budget from the start.

The tool that makes continuity possible is phasing: sequencing the work so that at every moment the hospital still functions and the pieces move in a workable order. Because you rarely have spare space, phasing usually runs as a rolling decant loop - you create a little new capacity, move a function into it, free up the space it left, work on that space, and repeat.

A typical sequence begins with enabling works: build a new block on whatever spare land exists (or a temporary/modular facility), and carry out the diversions of services and roads that later phases will need. Then you decant - move a department out of an old wing into the new capacity. Now the vacated wing is empty and can be refurbished or demolished and rebuilt without a single patient inside it. Finally you backfill the renewed space with the next function, and the loop turns again. Done well, the hospital is only ever giving up one manageable piece at a time, and never its critical services all at once.

The figure in this lesson shows this four-phase loop - enabling, decant, refurbish, backfill - with the crucial banner that the hospital never closes. Two planning ideas from Module 1 pay off enormously here. The first is having designed with soft space and expansion zones in the first place, so there is somewhere to decant into. The second is the disciplined grid and interstitial/service zones, which let a floor be re-serviced and re-fitted without disturbing the one below.

Phasing is not only a construction concern; it is a design driver. The phasing and decant strategy must be worked out early, with the hospital, because it shapes the massing, the location of the first new block, the temporary routes, and a programme that can stretch over years. A brilliant final design that cannot be built in safe phases on a live site is not, in this context, a buildable design at all.

The single greatest danger of building on a live hospital is infection. Construction and renovation disturb decades of settled dust, and that dust carries fungal spores - Aspergillus above all - that are harmless to most people but can cause fatal infections in the immunocompromised patients a hospital is full of. Managing this is not optional or informal; it is done through a structured process usually called the Infection Control Risk Assessment, or ICRA, carried out with the infection-control team before work starts and enforced throughout.

The logic of ICRA is to assess the risk, then contain it in proportion. You weigh the type of construction activity (from minor works to major demolition) against the vulnerability of the patients nearby (from low-risk offices to high-risk ICUs, theatres, oncology and transplant units), and that combination sets the level of containment required. The containment measures are physical and specific: sealed dust barriers between the works and occupied areas; holding the construction zone under negative pressure so air is drawn into it and dust cannot escape toward patients; sealing ducts and returns; tacky mats and cleaning protocols at exits; and dedicated construction routes and hoists so workers, materials and debris never cross patient areas. The figure shows this containment - the occupied clinical zone, the sealed barrier, the negative-pressure works zone, and the separate construction route.

> Every gram of construction dust is a potential infection. On a live hospital, containing it is a clinical intervention, not a courtesy.

Two disciplines sit alongside dust control. Utility continuity protects the critical services - power, water, medical gases, IT - so that a shutdown for the new work never silently endangers a patient on the old side; every planned interruption is assessed, scheduled, communicated and backed up. And water safety deserves special mention: works that disturb or create dead-legs in pipework can breed Legionella, so flushing and commissioning regimes matter (Module 5.4). The exact ICRA classes, containment specifications and monitoring belong to the current standards and the infection-control team - verify them there; what you carry from here is that on a live hospital, infection control governs the construction as strictly as it governs the clinic.

Building on a live hospital succeeds or fails on coordination and communication as much as on drawings. The design and construction team, the hospital's clinical leadership, the infection-control team, the estates and facilities staff, and the contractor have to operate as one, because a decision that looks purely logistical - when to shut a corridor, where the hoist goes, which night to switch a substation - is, in a hospital, a clinical decision.

Several practices make this work. Agree the phasing, decant and construction methodology with the hospital early and treat it as part of the design, not a contractor's afterthought. Establish clear, protected temporary routes and wayfinding for patients, staff, ambulances and the public whenever construction diverts a normal path - a diverted emergency route must be unambiguous and fast. Plan every service interruption in advance with the estates team, with backups ready and clinical staff informed. Keep noise and vibration away from the times and places that cannot tolerate them - imaging, surgery, sleeping wards - which may mean night work or vibration limits near sensitive equipment. And build in monitoring: air sampling, barrier inspections and a route for staff to report a breach immediately.

There is a human layer beneath the technical one. Patients are trying to recover, and staff are trying to deliver care, inside a building site. Reducing the noise, dust, disruption and anxiety they experience is part of the design responsibility, not a nicety - a considerate, well-communicated phasing plan is itself a form of patient and staff care. This is also where the humane spine of the course meets its most operational test: the measure of a good live-hospital project is that patients kept getting better, and staff kept working safely, and most of them barely noticed the enormous, carefully choreographed effort going on to protect them.

Get this right and you can renew a hospital across a decade without ever closing its doors. Get it wrong and you can harm the very patients the new building is meant to serve - which is why, on a live hospital, how you build is as much a part of the design as what you build.