The Concept of Passive House: An Interview with Toyin-Ann Yerifor

Green building concepts have come a long way. As architects, designers, and builders gain access to better tools that help push the limits of construction energy efficiency; we see longer strides made towards more mainstream adoption of green building standards. One such standard that is coming of age is passive houses. The concept of passive houses was first mooted in the early eighties when the idea of green homes was still in its infancy. Today, the concept is well entrenched with over 25,000 houses and buildings across the world qualifying as passive houses.

We recently caught up with Toyin-Ann Yerifor, an architectural consultant focused on exploring new and innovative ways to design with reduced impact on the environment to explain what passive houses are and their benefits. She holds an MSc in Architecture (AEES) from the University of East London, an MBA from the University of Northampton and an MSc in Computer Science and Engineering from the Université Grenoble Alpes.

What is a Passive House?

First, what is a passive house? Toyin-Ann explains: A passive house is any building that adheres to rigorous energy efficiency standards. The term passive comes from the fact that the building’s energy efficiency comes from its passive structures, which include the roof, walls, windows, doors, and floor. By radically improving the building’s insulation and energy conservation features, it is possible to reduce its heating requirements by up to ninety percent. As such, passive housing as a standard is focused on helping reduce the energy requirements of buildings through insulation, and by extension, their overall energy footprint.

When you reduce a building’s energy footprint, says Toyin-Ann, several benefits accrue, including environmental, health, and cost efficiency benefits.

Environmental Benefits of Passive Houses

According to the International Energy Agency (IEA), “energy efficiency is the first fuel of a sustainable global energy system. It can mitigate climate change, improve energy security, and grow economies while delivering environmental and social benefits.” Passive houses deliver on this mandate superbly, says Toyin-Ann Yerifor.

One of the biggest challenges traditional buildings face is energy loss. When a building easily loses energy in the form of heat, it takes burning more fuel to heat the building. When this happens, overall energy consumption goes up, which is bad for the environment because a major portion of heat generation comes from burning fossil fuels. When buildings are radically energy efficient, on the other hand, less energy is required, and so fewer fossil fuels need to be burned.

While this is the macro view of the environmental benefits of passive houses, are there any micro benefits of investing in this technology? Here are two, says Toyin-Ann Yerifor. First, think of the air quality that comes with less energy consumption. In homes that rely on furnaces, doing away with the furnace improves the air quality in and around the home significantly.

Second, sound pollution is eliminated if you no longer need to use a furnace, HVAC units around the home, or any other heat generation and management devices. Essentially, says Toyin-Ann Yerifor, passive houses reduce the need to burden the environment. Through radical energy efficiency and self-sufficiency, passive house buildings become a part of the environment and not just an addition to it.

Health and Comfort Benefits

When most people hear about passive houses, they imagine living in a sealed paper bag. That thought can be quite disheartening because issues of quality of air, air adequacy, and comfort come to mind. Although the idea behind passive houses is energy efficiency through a tightly sealed envelope (building), this does not mean health and comfort are compromised. Take air quality, for instance. Most people consider opening a window the best way to guarantee air quality in a room. Now, passive houses rely on closed windows to ensure no heat escapes, which presents a dilemma. Passive houses address this dilemma well, says Toyin-Ann Yerifor.

Although you can open a window in a passive house, even if you do not, the heat recovery ventilation system ensures there is enough quality air circulating the house. Regarding comfort, passive houses maintain a comfortable temperature regulated by the passive heat sources in the house like appliances, body heat, and lighting. Also, they tend not to have cold spots or hot spots, which is often the case with traditionally heated homes. Through rigorous design standards afforded by tools such as the Passive House Planning Package, homes built on the passive house standard adhere to comfort standards as rigorous as the energy efficiency standards stipulated.

Cost Efficiency Benefits

Cost efficiency is at the heart of the passive house concept. When a building is exceptionally well insulated, it can use as little as 10 percent of its regular heating energy requirements. This, of course, also significantly reduces the costs associated with heating the building. So, how does the passive house concept achieve such a radical reduction in energy needs? The answer is insulation, says Toyin-Ann Yerifor. Passive houses rely on extensive insulation to gain this level of energy efficiency. Why is insulation so effective?

Traditional buildings lose a lot of heat through the roof, walls, floor, doors, and, most of all, windows. With a passive house, each of these structures is carefully designed and built to ensure close to zero loss of heat. When you look at the thermal scan of a passive house next to a traditional house, you’ll notice the passive house is almost entirely blue, meaning there’s close to no energy loss. The other building is close to all red, meaning it is losing a lot of energy. This level of energy conservation and efficiency is what leads to the massive energy savings that make passive houses so cost-efficient.

Passive houses are a concept that is yet to hit mainstream construction. However, this does not mean it is impractical to build passive houses. What it does point to is the need for better awareness of the concept. Toyin-Ann Yerifor recommends anyone interested in the concept to visit a passive house showcase home to experience its benefits firsthand. She says this is the only way to understand and internalize this breakthrough energy efficiency concept.

Top 5 Most Popular Green Buildings In The World

The world is becoming more environmentally conscious today, and people are beginning to see the importance of sustainable living. One way this is being manifested is in the construction of green buildings. These structures are designed with the environment in mind, using materials and strategies that minimise their impact on the earth.

Here we will look at 5 of the most popular green buildings in the world!

empire state building

1. The Empire State Building, New York City

The Empire State Building is listed among the most popular green buildings in the world. The building is an icon of American architecture in New York City. It was the termed tallest building in the world after completion in 1931.

Today, this building remains one of the tallest skyscrapers in the United States. It remains one of the most known tourist destinations in New York City. I’m lucky to have been able to tour the building, even with my demanding school schedule. The fact that there are professional writers I can pay to do my homework for me is beneficial.

Interestingly, the building has an Observation Deck on the 86th floor. The Observation Deck offers visitors a panoramic view of New York City.

The Empire State Building houses several offices and businesses. The building has a total of 102 floors. This building is deemed one of the most popular green buildings in the world because of its sustainable design and operations. The building has a LEED Gold certification. The LEED Gold certification is given to establishments that meet strict environmental and energy efficiency standards.

The Empire State Building uses 25% less energy than a traditional office building of its size. The building also has water-saving fixtures, and recycled materials were used in its construction. In addition, the building has a roof garden that helps to insulate the building and reduce the heat island effect.

2. Taipei 101

Next on our list of famous green buildings is Taipei 101. Taipei 101 is located in Taipei, Taiwan. It is the tallest skyscraper in Taiwan and the second tallest building in the world until the completion of the famous Burj Khalifa in Dubai.

Taipei 101 is one of the world’s most famous green buildings for various reasons. First and foremost, the building was designed with sustainability in mind from the beginning. The architects took into account that Taipei is located in a subtropical climate, and they used that to their advantage by incorporating features like a double-skin façade and an atrium that help naturally ventilate the building.

As a result, Taipei 101 uses 30% less energy than a traditional skyscraper of its size. In addition, the building also has a rainwater harvesting system that recycles greywater for use in the toilets and landscaping.

Finally, Taipei 101 is home to an ample open space on its ground floor that serves as a public park – another rarity in a city where space is at a premium. All these factors combined make Taipei 101 one of the most popular green buildings in the world.

3. Hearst Tower, New York

Located in New York City, Hearst Tower is the headquarters of Hearst Corporation. The building was completed in 2006, and Norman Foster designed it.

Hearst Tower is one of the most popular green buildings in the world because it was one of the first skyscrapers to be certified by the Leadership in Energy and Environmental Design (LEED).

The building features a rainwater harvesting system, which recycles water for use in the cooling towers. The building also has a double-skin façade, which helps to regulate temperatures inside the building.

What’s even more impressive is that the building was designed to use 30% less energy than a traditional skyscraper of its size.

4. The Crystal, London

The Crystal is located in London, and it is a sustainable development that focuses on urban living. The building was completed in 2012, and Grimshaw Architects designed it.

The Crystal has also been certified by LEED and features several sustainable design elements. For example, the building has solar panels, which provide power for the common areas of the building. There is also a green roof, which helps to insulate the building and reduce energy consumption.

most sustainable building in the world

In addition, the building has a rainwater harvesting system, which recycles water for use in the toilets and landscape irrigation.

5. Shanghai Tower

Last but not least is the Shanghai Tower, completed in 2015 and stands at a whopping 2073 feet (632 meters). The tower has several sustainable features, including rainwater harvesting, solar panels, and double-skin facades.

The Shanghai Tower is undoubtedly an impressive feat of engineering and a great example of what’s possible when it comes to green buildings.


The list mentioned above is endless when it comes to notable green buildings around the world. These are just some of the most popular ones that offer sustainable, eco-friendly design elements worth learning from!