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DCD Design Cost Data

Investing in Sustainable Buildings

Chris Walker

Posted: November 24, 2023 | Project Management

By Chris Walker

The need to reduce carbon emissions while scaling up our cities to meet the demands of urban growth has implications for how we design, construct, operate, and maintain buildings. Find out why “going green” needs to be at the top of your priority list and the solutions that will get you there.

In this, you will find the following:

• Answers to the question of why we need further investment in sustainable buildings.
• Identification of the potential solutions to improve sustainable building design, construction, operation, and maintenance.
• A preliminary analysis of current and emerging solutions that can help decarbonize the built environment.

Net Zero and the Built Environment

Decarbonizing buildings has a vital part to play in reaching global net zero greenhouse gas (GHG) emissions.

The world is currently undergoing the largest wave of urban growth in human history. By 2060, two-thirds of the expected global population of 10 billion people will live in cities of some form.(1) To accommodate this growth, cities need to roughly double the current floor area available. To put it into perspective, this means adding a floor area equivalent to the area of Manhattan in New York City every month for the next 40 years.

At the same time, when including building construction, the buildings sector today is responsible for approximately 35% of global energy use and 38% of global GHG emissions.(2) With more and more countries, cities and businesses committing to net zero emissions by 2050 or sooner, decarbonizing the buildings sector will play a vital role in achieving that target.

These figures highlight the huge potential for the buildings sector to contribute to reducing global GHG emissions by designing and delivering more sustainable buildings.

Why Invest in Sustainable Buildings?

While people and the planet are the ultimate winners of a more sustainable, net zero future, positive environmental outcomes are not the only advantage of sustainable buildings. Put simply, the greener the building, the more it’s worth.

There are a Number of Bottom-Line Benefits to Going Green

Tenants and investors are increasingly gravitating to energy efficient and sustainable buildings.(3) Such buildings have also been shown to attract higher values, known as a “green premium.” For example, in Sydney and Melbourne, buildings that have been awarded a 4.5-star National Australian Built Environment Rating System (NABERS) sustainability rating are worth on average 8% more than comparable unrated buildings on a per square meter basis and for buildings awarded between a five- and six-star rating this can increase to 18%.(4) In London, highly rated buildings are worth 10% more than comparable unrated workplaces(5) and in the USA, evidence shows that green certifications like Leadership in Energy and Environmental Design (LEED®) result in a sales premium of up to 7.6%.(6)

Key Principles Underpinning Sustainable Design

Not all sustainable buildings are the same. The climatic conditions and cultural needs — as well as wide-ranging environmental, economic, and social priorities — means the challenges and demands of sustainable buildings will vary between countries, and even regions.

However, there are many shared guiding principles of sustainable building design and delivery that are a critical consideration for any built environment asset (view the Nov/Dec issue of DCD for image).

Retrofitting vs. New Construction

There are two ways to deliver sustainable buildings — constructing new, more efficient buildings or improving existing buildings through a retrofitting program. Retrofitting buildings can improve building performance, significantly reduce energy and water usage, and improve amenities for occupants. Retrofitting also offers the ability to retain the significant resources already embedded within them which would otherwise be wasted if the building was demolished to make way for new construction. New construction — on the other hand — guarantees a fit-for-purpose asset, greater design flexibility, and may be more adaptable to future or changing urban needs.

When we consider the contribution of the building sector to current GHG emissions and the scale of construction that must take place in cities to accommodate future growth in urban populations, it is clear both approaches are part of the solution. As Jeff Merritt, Head of Internet of Things (IoT) and Urban Transformation at the World Economic Forum says: “In order to meet the goals of the Paris Agreement to limit global warming, we need to see in the next ten or so years the majority of our buildings become net zero carbon. Any guess on how many cities currently meet that goal? Less than one per cent. There is a staggering challenge here.”(7)

Just how staggering is well illustrated by the statistics below.

  • 75% Buildings in the European Union classed as energy inefficient (8)
  • < 1% Global building stock achieving net zero emissions(9)
  • 230b Additional square meters of floor area needed to accommodate predicted urban growth by 2060(10) 

Emerging Solutions

Regardless of whether you’re retrofitting an existing building or designing a new one, the first step on the sustainability journey is to capture an inventory of potential sustainable building solutions and begin the process of evaluation and selection. There is a growing list of decarbonization solutions that can potentially be incorporated into building designs that tackle both operational emissions and embodied emissions (view the Nov/Dec issue of DCD for image). 

What Solutions Should You Incorporate into Your Project?

Well, there’s no simple answer, but there are a range of tools that can be used to assess the different options available. In this case, we conducted a multi-criteria analysis assessing the potential feasibility and perceived value of each sustainability solution in the built environment today.

The evaluation highlights a number of solutions that have already proven to be effective at building decarbonization and are also readily available for implementation. There are also a number of exciting solutions that, while having the potential to result in effective decarbonization, may have limited application right now or are still in their development and testing phase.

The opportunities for improvements in building sustainability and decarbonization are vast, across both the embodied and operational carbon areas. No doubt, additional solutions and more innovative applications of existing solutions will continue to be developed, trialed and applied globally. For designers, asset owners and developers, the challenge will be to find solutions that can be applied at scale, in a cost-effective way to deliver the quantum of decarbonization required across the built environment to deliver the net-zero targets that are in place today.

It really is a race to zero.


1. UN Environment and International Energy Agency. (2017). Towards a zero-emission, efficient, and resilient buildings and construction sector. Global Status Report 2017.
2. United Nations Environment Programme. (2020). 2020 Global Status Report for Buildings and Construction: Towards a Zeroemission, Efficient and Resilient Buildings and Construction Sector.
3. Kelly, R. (2021). Green buildings worth more to investors. From the Australian Financial Review.
4. ibid
5. ibid
6. Kantro, G. (2022). From value creation to value preservation — real estate investors rethink the “value of green”. Best in class buildings now prioritize climate risk, and carbon emissions.
7. Jeff Merritt, Head of IoT and Urban Transformation at the World Economic Forum. As quoted by Deloitte in Smart and Sustainable Buildings and Infrastructure.
8. European Commission. (2020). In focus: Energy Efficiency in Buildings, European Commission.
9. Jeff Merritt, Head of IoT and Urban Transformation at the World Economic Forum. As quoted by Deloitte in Smart and Sustainable Buildings and Infrastructure.
10. UN Environment and International Energy Agency. (2017). Towards a zero-emission, efficient, and resilient buildings and construction sector. Global Status Report 2017.

About the Author: Chris Walker is an environmental scientist with more than 14 years’ experience working in a variety of infrastructure design, construction, and operational roles. As Jacobs’ Global Principal for Integrated Urban Sustainability, he takes a multi-disciplinary approach to optimize the functioning of our precincts and cities as a whole.

About Jacobs: Jacobs Solutions Inc. is an American international technical professional services firm. The company provides engineering, technical, professional, and construction services, as well as scientific and specialty consulting for a broad range of clients globally, including companies, organizations, and government agencies. Jacobs is challenging today to reinvent tomorrow by solving the world’s most critical problems for thriving cities, resilient environments, mission-critical outcomes, operational advancement, scientific discovery, and cutting-edge manufacturing — turning abstract ideas into realities that transform the world for good. For more information, visit