The construction industry is going through major changes under the Green flag. The greening of building stock and infrastructure becomes more than just an idea, but a strategical attribute in developing the future of the precincts and entire cities all over the world.
The net zero carbon target is ambitious and requires that all new buildings must be operational zero carbon by 2030, and all new and existing buildings must be net zero carbon by 2050.
Transition from building better to building sustainable.
Impact reduction target is a fundamental aspect of concept design and will assist the transition in sustainable construction. Designers and experts are used to discussing energy efficiency, or kWh/m2, but very rarely there is a carbon target (e.g. 100 kgCO2 per m2 of lettable area per year) set at an early project stage (A rough carbon budget for buildings was presented by eTool in a previous blog article).
We hear more often about passive design principles, energy-efficient equipment and storage, carbon-negative materials and a combination of onsite and offsite production of clean energy. Renewable energy generation is increasing at phenomenal speed and it’s transforming the whole economy, reducing environmental impacts related to building’s operations and manufacturing of construction products.
At a district level, buildings are being thermally and electrically integrated with the community, and energy monitoring platform can track large groups of building performance, scaling up to whole district analysis. Targets climate funding is also helping retrofit existing buildings at municipal level and replicate success cases in other regions.
Different construction sectors define green design through different indicators.
Definition of the green design varies depending on specific needs but aims to accelerate the change towards a future in balance with the planet.
Tenants are motivated by the reduction of operational costs with energy and water bills, but it can also include aesthetics and being environmentally conscious, stating that “I care” or “I am different”.
Home owners would focus on the durability of materials, life of the entire property and low maintenance cost.
Developers would probably look on environmental aspects in combination to total cost and return on investment – called a “Green per Dollar” perspective.
Finally, the precincts and local governments might go with green construction by various reasons: to encourage innovation, long-term city planning including improvement of citizen’s well-being, quality of life and environment.
Life Cycle Design as a method to look inside the black box.
Green design and performance indicators need to be transparent and standardized to satisfy major motivations of groups and individuals. The best way to fully quantify the environmental impact is by looking at the whole of project life cycle performance and using Life Cycle Design (LCD) methodology to model impacts from construction through to the end of life, including use phase impacts. Most importantly, LCD can help to understand the project functionality, and how well it is delivering the proposed primary function. LCD looks at a building through the prism of many features, holistically and over the life time. This prism includes operational energy and water, durability of materials, maintenance and wide spectrum of environmental impacts. LCD approach is combined with Life Cycle Costing to help designers understand the “Green per Dollar” feasibility of improvement initiatives and how economically sustainable the overall design is throughout its lifespan.
Life cycle thinking to build better buildings today.
There´s a global trend in the construction industry to adopt life cycle thinking and we increasingly hear terms like circular economy, cradle-to-grave or even cradle-to-cradle, closed loop recycling or designing for deconstruction. The use of Life Cycle Assessment is increasing in a number of Green Building Rating Schemes (Green Star, LEED, BREEAM, HQE, LBC), and also is the newly available life cycle inventory data, user-friendly LCA software tools, Environmental Product Declarations.
The growth in regulations within the construction industry is also observed, with planning policies mandating environmental reduction targets and improving the general industry know how. Companies are using science based targets to measure efficiency of their climate action plans and understanding how they are related to the UN´s Sustainable Development Goals (SDGs).
To meet changing requirements related to a sustainable future within the construction industry, systems and tools need to be widely used from concept stage on throughout the design development process. This will allow project teams to set ambitious environmental targets and therefore implement the life cycle approach to deliver the buildings of the future already today.
UN environment – The Global Status Report 2017 – Towards a zero-emission, efficient, and resilient buildings and construction sector
World Resources Institute – What Is the Future of Green Building?
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