Housing design affects more than appearance, comfort and property value. It can also influence health, indoor temperature, energy use and exposure to disease.
New research highlighted by the Kenya Medical Research Institute demonstrates how relatively simple housing improvements can help homes remain cooler while reducing the entry of malaria-carrying mosquitoes. The findings strengthen the case for treating healthy housing as an important part of interior design, architecture, construction and public policy in Kenya.
The KEMRI housing study
KEMRI researchers conducted a pilot study involving 40 households in Siaya County. The study examined reflective cool roofs, improved cross-ventilation, locally made mat ceilings and homes without the modifications. Doors, windows and eaves in the intervention homes were also screened to restrict mosquito entry.
According to KEMRI, reflective white coatings applied to metal roofs produced the strongest cooling results. Indoor daytime temperatures were reduced by up to 3.3°C, while night-time temperatures fell by up to 2.4°C.
Screening the houses was associated with a 77% reduction in female Anopheles funestus mosquitoes and a 58% reduction in Culex mosquitoes. These findings suggest that passive cooling and mosquito protection can be considered together when designing and improving homes. Read the original KEMRI report.
The research was published in Nature Medicine and involved KEMRI, the Liverpool School of Tropical Medicine, Charité – Universitätsmedizin Berlin, Università degli Studi di Milano and Habitat for Humanity International. View the research paper.
Why this matters to interior design
Interior design is concerned with how people experience and use space. That responsibility includes thermal comfort, ventilation, material selection, daylight, privacy, safety and the relationship between interior spaces and the building envelope.
A room may be visually appealing but still perform poorly if it traps heat, has inadequate airflow or allows insects to enter easily. Healthy interior environments therefore require designers to consider how roofs, ceilings, windows, doors, vents, screens and internal layouts work together.
The KEMRI findings demonstrate that effective interventions do not always require expensive mechanical systems. Locally available materials and carefully considered passive-design measures can make a meaningful difference, particularly in homes where air conditioning is unavailable or unaffordable.
Practical lessons for Kenya’s design industry
The study raises several considerations for interior designers and other built-environment professionals.
1. Thermal comfort should begin at the design stage
Heat should not be treated only as a problem to be solved with fans or air conditioning after construction. Roof finishes, ceiling systems, shading, orientation, openings and material choices can reduce heat entering and remaining inside a building.
2. Ceilings are functional design elements
Ceilings influence more than the appearance of a room. They can affect heat transfer, air movement, acoustics and lighting. The use of locally made mat ceilings in the KEMRI study shows the potential of affordable materials when they are properly assessed and incorporated into a wider design strategy.
3. Ventilation must respond to how occupants live
Providing windows does not automatically guarantee effective ventilation. Their location, size, security, privacy and ease of use influence whether occupants will keep them open. Designers should develop ventilation solutions that work with daily behaviour rather than depending on ideal conditions.
4. Insect screening should be integrated into the design
Mosquito screening is often treated as an addition installed after a home is occupied. Integrating screens into windows, doors, vents and eaves from the beginning can improve appearance, durability and usability while supporting disease prevention.
5. Local materials can support scalable solutions
Affordable and locally available materials may make healthy-housing improvements accessible to more households. Designers can contribute by identifying appropriate materials, developing practical details and ensuring that the finished spaces remain functional and dignified.
An opportunity for multidisciplinary collaboration
Healthy housing cannot be delivered by one profession acting alone. It requires collaboration among researchers, public-health specialists, interior designers, architects, engineers, contractors, material suppliers, manufacturers, housing developers and government agencies.
For interior designers, this creates an opportunity to contribute knowledge about how people use spaces, how materials perform in everyday environments and how technical interventions can be incorporated without compromising usability or quality.
Research institutions can provide scientific evidence. Designers can help translate that evidence into spaces and specifications. Manufacturers and suppliers can support the development of affordable products. Government can encourage adoption through housing programmes, public procurement, building standards and climate-resilience policies.
Designing health into Kenyan homes
The wider lesson from the KEMRI research is that housing can actively support public health.
As Kenya responds to rising temperatures, housing demand and persistent malaria risk in some regions, the design industry must look beyond appearance alone. Good design should contribute to homes that are cooler, safer, healthier and better suited to their local climate.
The Interior Design Society of Kenya supports an approach to interior design that combines creativity with function, sustainability, public health and social impact. Evidence-led housing design provides an important opportunity for Kenya’s interior design profession to demonstrate its value within the country’s wider built environment.
This article is an independent IDSK commentary based on research reported by the Kenya Medical Research Institute. Readers should consult the original KEMRI publication and research paper for the complete scientific findings.
