Articles
What makes a building sustainable?
Posted by 
Sustainability is a topic on everyone’s lips right now, especially in the construction industry. But what does it really mean? Are sustainable buildings simply those that use energy responsibly once occupied? Or those built using recycled materials?
In truth, a building’s sustainability can encompass its environmental impact throughout its lifecycle, from the materials used during construction to the energy consumed while in use and the building's long-term durability.
In this article, we explore the different elements that come together to make a building sustainable.
Read more: What is sustainable construction?
The pillars of sustainable building
To achieve sustainability in construction, a wide range of elements have to be considered, including:
Materials
One of the biggest contributors to the sustainability of a building are the materials used during construction. When selecting building materials, specifiers may consider factors such as recycled content, embodied carbon, responsible sourcing and end-of-life recyclability.
Today, many construction materials incorporate recycled or secondary materials that reduce reliance on virgin resources. Examples include recycled aggregates, reclaimed timber products and secondary materials recovered from industrial processes. These alternatives can help reduce embodied carbon by avoiding some of the emissions associated with extracting and manufacturing new materials. The Lignacite ECO Range, for example, contains up to 70% recycled content and is supported by independently verified Environmental Product Declarations (EPDs) and recycled-content verification.
It is also important to consider how materials are sourced. Responsible sourcing schemes provide assurance that materials have been obtained with consideration for environmental, social and ethical impacts, including effects on natural habitats, watercourses and local communities.
Durability and longevity
Sustainability is not just about reducing a building’s impact today. It is also about ensuring that it continues to perform effectively for decades to come.
Using robust, high-quality materials can increase the lifespan of a building while reducing the need for repair, replacement and maintenance. This can help minimise waste, conserve resources, limit disruption and lower the overall environmental impact of the structure over time.
Resource efficiency
The use of resources such as water, energy and raw materials throughout the construction process can contribute to sustainability.
This includes how materials are manufactured, how much energy is consumed during production and how they are transported to site. Efficient manufacturing processes can reduce energy and water consumption, while careful material selection and procurement can minimise waste. Where feasible, using locally sourced materials can also help to reduce transport emissions.
Energy efficiency
Energy efficiency can have a significant impact on the sustainability of a building. Factors including insulation, airtightness, thermal performance and technologies such as solar panels and heat pumps can all influence how much energy a building uses.
Buildings that require less energy to heat, cool and operate typically use less fossil fuels and have a lower environmental impact throughout their lifespan.
Health and well-being
A sustainable building should support the people who use it as well as the environment.
Factors such as indoor air quality, natural daylight, thermal comfort and acoustic performance all contribute to the quality of the internal environment. Alongside considerations such as fire safety, good building design can help create spaces that are healthier, safer and more comfortable for occupants.
Using sustainable materials
With increasing attention on sustainability and growing demands from planners, developers and local authorities, there is growing interest in lower-carbon construction materials – and manufacturers are responding to those market signals.
They are increasingly developing products that reduce reliance on virgin resources, incorporate recycled content or are supported by independently verified environmental data. This can help specifiers make more informed decisions when comparing products and assessing their environmental impact.
At Lignacite, recycled and secondary materials have been incorporated into our masonry blocks since the company was founded in 1947. Graded wood particles and recycled sand are used across our product ranges, helping to reduce reliance on virgin materials while maintaining strength, durability and consistency. Rather than extracting additional raw materials from the natural environment, these secondary materials are recovered from waste streams and incorporated into new products. To learn more, read our guide to recycled aggregates.
It is important to remember that sustainable material selection is not only about how products are made, but also what happens at the end of their servicable life. Materials that can be recovered, reused or recycled may provide value long after their original purpose has ended. Concrete masonry can often be crushed and reused as aggregate or hardcore, helping to support the circular economy.
Other factors that make buildings sustainable
It's not just materials that influence sustainability. How materials are manufactured, transported and managed throughout the supply chain also matters.
Some manufacturers invest in renewable energy generation, water recycling systems, waste reduction initiatives and energy-efficient production processes to reduce the impact of their processes. For example, our factory in Brandon features solar panels on the roof, insulated block-curing chambers and water-saving measures designed to improve resource efficiency.
Materials transported long distances or delivered using conventional fuels may also carry a higher environmental impact than those sourced and delivered more efficiently. To help customers reduce transport-related emissions, we offer HVO-powered deliveries from Nazeing to locations across London. Hydrotreated vegetable oil (HVO) can reduce greenhouse gas emissions by up to 90% compared with conventional diesel.
Meeting and exceeding standards
Independent certifications and third-party verification can provide transparency, demonstrating that products and manufacturers meet recognised standards. For example, ISO 14001 relates to environmental management systems, ISO 50001 focuses on energy management and BES 6001 covers responsible sourcing.
Of course, sustainable building materials must continue to meet the same performance requirements as conventional alternatives, including fire safety, acoustic performance, structural strength and durability.
At Lignacite, our ECO Range combines independently verified sustainability credentials with the technical performance expected from modern concrete masonry. The recycled content levels in our blocks have been independently verified by consultants at Blue Marble, while embodied carbon figures are supported by Environmental Product Declarations (EPDs). At the same time, the blocks continue to meet the relevant fire, acoustic and performance standards required for construction projects.
The benefits of sustainable buildings
Sustainable buildings can deliver environmental, economic and social benefits throughout their lifetime.
From an environmental perspective, they can help reduce carbon emissions, minimise waste and lower reliance on finite natural resources.
Economically, sustainable buildings may help reduce operating and maintenance costs through improved energy efficiency, greater durability and more efficient use of resources.
There are social benefits too. Sustainable buildings that prioritise comfort, safety and wellbeing can create healthier and more enjoyable environments for occupants. In many cases, thoughtful design and durable construction mean that buildings remain useful and relevant for longer.
Building a sustainable future
Whether your next project is a home, commercial development or public building, sustainability is likely to be a key consideration.
But it’s important to remember that sustainable building is not defined by a single product or feature. Instead, it results from a combination of responsible material choices, efficient design, strong performance and long-term thinking.
By considering both the short-term and long-term impacts of construction decisions, designers, contractors and developers can help create buildings that deliver lasting value for occupants and the wider environment.
If you're exploring ways to reduce the environmental impact of your next project, take a look at the Lignacite ECO Range. Our carbon calculator and technical guidance resources demonstrate how lower-carbon concrete masonry could contribute to your sustainability objectives.
