Khoo Teck Puat Hospital in Yishun, in the north of Singapore, is often called a “hospital in a garden”. Opened in 2010, it wraps its wards around a planted courtyard, faces a landscaped pond, and carries gardens and a working farm on its roofs. The brief behind it was unusual: its leadership wanted people’s blood pressure to drop as they walked into the grounds.
Did it work? The building has strong, measured results on airflow, energy use and wildlife, and surveys show that patients, staff and visitors feel better there than in a conventional hospital. What has not been shown is that the greenery lowers blood pressure or speeds recovery in a measurable clinical way. That distinction matters, and it is worth understanding both the design and the evidence.
The brief: a hospital that calms you on arrival
Most hospitals are designed around equipment, corridors and infection control. Patients remember the smell of disinfectant, the hum of machines and the long, windowless waits. The team behind Khoo Teck Puat set out to change that first impression. According to the International Living Future Institute’s case study, the hospital’s then chief executive asked that visitors’ blood pressure should fall as they entered, and the designers treated that as a guiding goal for an immersive natural setting.
The architects were Singapore’s CPG Consultants working with RMJM, and the hospital was planned in the mid-2000s, originally under the working name “Alexandra Hospital @ Yishun”. It took its final name from the late hotelier Khoo Teck Puat, whose family donated S$125 million. Outpatient services began in March 2010, inpatient wards followed in June, and the hospital now has around 795 beds.
How the building brings nature inside
The main blocks form a V shape around a central court that opens to the north. Breezes travel across the neighbouring storm-water pond before reaching the wards, cooling the air on the way. In 2005 the hospital team adopted that pond and redesigned it as a public park, which the case study says multiplied the blue and green space available to patients and visitors several times over.
Greenery is stacked on every level. Terraced gardens sit on the podium roofs of the ward towers, with small trellised corners where patients can sit. There is a secure dementia garden next to the geriatric clinic, where staff control access. Planting climbs the facades, so many patients see leaves from their beds. The hospital measures this with a “green plot ratio” of about 3.92, meaning that the total area of planting is nearly four times the size of the site itself. Earlier reports spoke of hundreds of native and fragrant plant species across the grounds; the exact count varies by source.
Air, light and energy
The garden is not only decoration. Aluminium “wing walls”, or fins, on the facades catch the prevailing north-east winds and channel them through the wards. Wind tunnel tests at the National University of Singapore found these fins raise airflow by roughly 20 to 30 percent, which cut the building’s reliance on mechanical ventilation by about 60 percent.
Sun shades reduce glare while bouncing daylight up onto ward ceilings, solar panels on the roof power fans in public areas, and the air-conditioning system draws its intake from cooler, shaded courtyards. The hospital is reported to use around 30 percent less energy than comparable Singapore hospitals, saving more than S$1 million a year on utilities. In a hot, humid city, that is a serious operating saving, not a cosmetic one.
A rooftop farm and a home for butterflies
On the roof of the specialist outpatient block, neighbourhood volunteers run an organic farm with around 100 species of fruit trees, 50 kinds of vegetables and 50 herbs. Produce goes to the hospital kitchen, and the farm gives older residents a reason to visit, garden and socialise, which is itself a form of preventive health.
Wildlife followed the planting. The number of butterfly species recorded on site rose from 3 to 83, according to the case study. The grounds also became a community space: the hospital hosts talks and exhibitions, a sizeable share of visitors come for leisure rather than treatment, and since its opening it has been popular with students looking for a calm place to study.
What the evidence does and does not show
The idea that nature helps patients has a real research history. In a well-known 1984 study, environmental psychologist Roger Ulrich compared hospital patients recovering from gallbladder surgery in rooms facing either trees or a brick wall; those with the tree view had slightly shorter stays and needed fewer strong painkillers. Later laboratory work by Ulrich and colleagues found that people shown natural scenes after a stressful film recovered faster on measures that included blood pressure.
Those findings are suggestive but modest, and they come from small or controlled studies. For Khoo Teck Puat specifically, the main published evaluation is a 2016 post-occupancy survey of about 200 patients, staff and visitors. It found the hospital scored higher than an older Singapore hospital on perceived beauty, self-reported well-being and contact with nature, and more than 80 percent of respondents supported spending on green and water features. The hospital has also ranked at or near the top of the Ministry of Health’s patient satisfaction surveys.
None of this proves that the gardens lowered anyone’s blood pressure or shortened recovery times. Satisfaction and well-being are valuable outcomes, but they are not clinical measurements. A fair summary is that the design aimed for a calming effect, people report feeling calmer there, and the building delivers measurable environmental gains. If you are worried about blood pressure yourself, the right step is to talk to a doctor.
Recognition and lessons for other hospitals
The hospital won the first Stephen R. Kellert Biophilic Design Award from the International Living Future Institute, a nonprofit that promotes healthier, more sustainable buildings. The award is named after the Yale ecologist who helped define biophilic design, the practice of building people’s contact with nature into everyday spaces through light, plants, water and natural materials.
For hospital planners elsewhere, the lessons are practical. Orient buildings to catch breezes, give as many patients as possible a view of greenery, and design outdoor spaces people can actually use, including those with limited mobility. Involve the community, as Yishun’s volunteer farmers show. Budget honestly for maintenance, because gardens and green walls need care for decades. And measure results, both energy and human ones, so that claims rest on data rather than hope.
Sources: Photos: Khoo Teck Puat Hospital. International Living Future Institute: Khoo Teck Puat Hospital case study; Wikipedia: Khoo Teck Puat Hospital; Wikipedia: Biophilic design.
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