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What is a green building?
A wide-range of variables factor into green building design and construction. A lot of these variables are context-specific to its plot, neighborhood, and climatic region.
Some features of a green building 📝
Every aspect of a building can be optimized for energy-efficiency, zero-waste, and resiliency in the design principles.
Here are some examples of green building features:
Building materials: Building with reused, recycled, biodegradable, or carbon storing materials.
Emissions reduction: Renewable energy source such as rooftop solar and a smart grid, heat pumps for heating and cooling, and solar water heaters.
Temperature control: Insulation, cool roofs, solar shading, double paned windows, window glazing.
Flood and storm risk mitigation: Elevated building, planting trees or hedges for windbreaks, installing detention tanks for stormwater, permeable surfaces for water absorption into the ground.
Energy efficiency: Natural light and ventilation, smart meters, ENERGY STAR rated appliances, LED lights, sensors for powering off electric appliances, lights, or devices.
Water use: Low flow toilets, smart meters, rainwater harvesting.
Waste reduction: Compost, zero waste design, grey water recycling,
Social and cultural value: Accessibility, local art or design, community event spaces, educational design, modular spaces, noise and light pollution reduction.
Landscape and biodiversity: Vertical gardens, rooftop gardens, permeable design features, bird-friendly design.
Why are we looking for green buildings?
All of the design features of a green building help to “future proof” it from the risks of climate change and resource scarcity. At the same time, green building principles benefit occupants’ health and well being while providing cost savings.
To create sustainability models 💫
Solving sustainability challenges at the building-level is the start to creating scalable solutions at the community level. Buildings can serve as important landmarks that represent a new way of doing things.
For example, Singapore’s “green buildings” featuring high-tech vertical gardens and circular design principles have become world-famous emblems for a more sustainable future. In 2021, Climate Week NYC was hosted at its newly renovated Javits Convention Center, boasting a green roof.
Apart from these high-end examples, it is also important to spread access to low-income communities to the benefits of green building. These communities have faced some of the worst consequences of pollution, while contributing to it the least. Private-public partnerships can help finance this access.
To develop resilience-enhancing designs, technologies and materials 🏢
The green building sector is spurring design innovation for circularity, reuse, recycling and biodegradable materials. Examples include wood log structures that store carbon, bricks made of mycelium, and recycled textile bricks.
Concrete is one of the most widespread building materials, but recently the Guardian called it “the most destructive materials on earth.” From its production to its disposal, concrete causes 4-8% of global CO2 emissions and it is highly water intensive. That’s why companies are now creating sustainable concrete.
To face global health challenges related to pollution 😰
An estimated 3.8 million people die from premature deaths linked to indoor air pollution, according to the WHO. Considering Americans spend 90% of their time indoors, the indoor air quality is particularly important. The EPA estimates that indoor air pollution can exceed air pollution outdoors by 2 to 5 times.
The sources of indoor air pollution include lead paint and pipes, asbestos, chemicals from cleaning products, mold, radon, smoke from combustion, and particulate matter. Recent studies also suggest that indoor gas-powered stove tops also contribute significantly to health risks.
🏡 6 characteristics of green buildings
The characteristics of green buildings make them more cost effective, healthy to use, and supportive of their communities.
Energy savings ⚡
Energy efficiency is one of the hallmarks of green building, because it not only serves the environment, it greatly reduces costs for building owners. Building insulation, double-paned windows, and window placement, sun shading, and cool roofs can all minimize the heat and cooling costs of a building.
While green building certifications (explained below) often consider how design affects energy efficiency, operation can also play a huge role. Beyond the building design, owners should source energy-efficient appliances and minimize their use of electricity and energy with the help of smart thermostats.
Material efficiency 👍
Accomplishing the design aims of a building with the least amount of materials is one of the benefits of green building. Designers consider ways to minimize material excess and waste through careful building design and material sourcing and selection.
Circular design principles, which consider the overall impacts across a building project’s life cycle help designers to identify key areas of improvement such as incorporating recycled, reused, or biodegradable materials.
Natural ventilation and lighting 🌞
Architectural designs that consider the directional flow of air and sunlight help buildings harness nature for useful purposes. Why use electric fans, when the wind can distribute air throughout a building? Why use electric lighting during the daytime, when well-placed windows can welcome the light?
These design considerations are part of the holistic thinking that makes green building less dependent on technology. Designers weigh the pros and cons of environmental forces to enhance their benefits for people indoors.
Healthier Inhabitants 💨
Green buildings reduce the toxic materials and emissions from buildings. They also prioritize healthy ventilation and access to natural mood-boosting sunlight.
Buildings can improve their indoor air quality with air-purifying potted plants and ventilation systems, as well as removing the sources of air pollution by using non-toxic materials, cleaning agents, and electric stoves.
Green buildings may appear more valuable on the surface because of their benefits, but they actually depend on cost-effective approaches to building that reduce the financial burden on building owners.
Savings come from strategies like reusing materials in renovation which improves cost in the short-term and embedding energy efficiency in the design, which saves on heating costs over the long-term.
Many regions also offer financing opportunities which incentivize green building strategies for developers or existing building owners. For example in the UK, grants of 5,000 GBP are available for homeowners to swap their old high emissions boilers with cleaner heating systems.
Local resources preservation ✅
Buildings are a part of the community, and they contribute to the health and well-being of the surrounding area. When buildings emit pollution or strain their resources, they can have negative impacts on the broader communities.
Water stress is a particular concern, because a quarter of the world’s water basins used for freshwater reserves are stressed. Half of these fall in China, India, and the United states.
Urbanization is concentrating water stress risk in cities. The global population living in cities increased from 0.8 billion (29.97%) in 1950 to 4.4 billion (56.2%) in 2020. Building owners and managers can address this by educating building occupants and improving building water efficiency.
Climate change is another risk that has a direct impact on buildings. The increasing frequency and intensity of storms and floods could make insurance less accessible or affordable in the future.
Buildings are also a part of the solution, because an estimated two-thirds of all greenhouse gas (GHG) emissions are generated in cities. Buildings are responsible for 40% of these emissions. Shifting reliance off gas heating with energy efficient heat pumps can significantly improve building emissions.