Integrating Sustainability as an Explicit Goal in Construction Project Delivery: Enhancing Design and Costing Practices Toward Net Zero 2050!

About the Project

In the face of accelerating climate change, sustainability is no longer a peripheral consideration, it is a central imperative across all sectors, particularly in the built environment. While the construction industry increasingly acknowledges the importance of sustainable development, the practical integration of sustainability into day-to-day project delivery remains inconsistent and underdeveloped. Current practice often treats sustainability as an add-on or compliance issue rather than embedding it explicitly as a measurable design and costing objective from project inception. This proposal seeks to investigate how sustainability especially in terms of carbon reduction can be structurally integrated into construction project goals and delivery frameworks.

The traditional understanding of “value” in construction has largely been defined by functional performance and financial return. These are typically pursued through technical goals such as reduced production costs, efficient workflows, minimised waste, alignment of design with construction sequencing, and optimised planning. These goals, strongly associated with Lean Construction, have significantly improved productivity and delivery outcomes. However, they often lack explicit integration of environmental objectives, thereby reinforcing a gap between cost-efficiency and ecological responsibility. While there is widespread awareness across stakeholders - from clients to contractors - of the need to reduce the environmental footprint of buildings, significant tension persists. Building owners and investors frequently question the return on investment for sustainable features, particularly in existing structures where retrofitting is costly. Although legislative pressures are increasing (e.g., Part L updates, Future Homes Standard), and net-zero by 2050 is a binding target in the UK, many projects still operate to a "minimum compliance" ethos rather than aspiring toward long-term performance outcomes. As regulations tighten, this shortsighted approach risks future financial penalties, stranded assets, and increased lifecycle costs.

Crucially, design teams and cost consultants often lack robust frameworks and tools to evaluate sustainability – particularly embodied and operational carbon – alongside traditional criteria of cost, time, and quality during early design stages. The challenge lies in transitioning sustainability from a theoretical or regulatory goal to a practical, quantifiable, and client-valued project deliverable.

This research proposes the development of a framework to incorporate sustainability -specifically carbon reduction – as a core, measurable objective during the design and costing phases of construction projects. Drawing inspiration from Lean principles, the project aims to expand the classical project triad (cost, time, quality) to include sustainability as a fourth pillar. This will involve both theoretical investigation and empirical validation through case study analysis. A key focus of the study will be how structural design tools and digital platforms (e.g., BIM-integrated Life Cycle Assessment tools) can estimate embodied carbon across design alternatives. By making carbon data accessible and understandable at early design stages, clients and project teams can make informed trade-offs between cost and carbon. This will also facilitate the inclusion of sustainability within value engineering and target value design practices – thus shifting it from a compliance activity to a central determinant of project success.

The study will adopt a mixed-methods approach, combining qualitative methods (e.g., interviews with clients, designers, and cost consultants on decision-making processes and perceived barriers) with quantitative methods (e.g., simulation of design options and carbon outcomes using industry software). It may also involve the development or evaluation of digital tools capable of calculating real-time carbon impacts during design iterations. The research could operate at either the organisational level (e.g., how firms develop sustainability competencies, manage risk, and interact across disciplines), or the operational level (e.g., how design tools influence real-time costing and carbon assessments).

Despite the increasing adoption of BIM and digital tools, their use in sustainability assessment remains fragmented and non-standardised across the industry. Many cost consultants are not yet fully trained in carbon literacy or ESG-related decision-making, which presents a systemic barrier. Additionally, while early-stage carbon assessment tools exist (e.g., LCA tool), their integration into costing platforms and client briefing documents is limited. This research will critically assess whether these tools are truly empowering decision-makers or merely reinforcing existing silos between disciplines. Further, the industry must confront its procurement and risk culture. Frameworks that promote lowest-cost tendering and fixed-price contracts often disincentivise sustainable innovations or integrated design thinking. The study would interrogate how project delivery models (e.g., Design and Build, IPD) either enable or obstruct sustainability-led collaboration.

Funding Notes

there is no funding for this project

References

• Love, P. E. D., Zhou, J., & Sing, M. C. P. (2019). Costing of carbon in construction: A critical review. Journal of Cleaner Production, 230, 1131–1142. https://doi.org/10.1016/j.jclepro.2019.05.135
• World Green Building Council (2021). Bringing Embodied Carbon Upfront. https://www.worldgbc.org/embodied-carbon
• Royal Institution of Chartered Surveyors (RICS) (2023). Whole Life Carbon Assessment for the Built Environment (2nd Edition). https://www.rics.org/standards-and-guidance
• Pomponi, F., & Moncaster, A. (2016). Embodied carbon mitigation and reduction in the built environment – What does the evidence say? Journal of Environmental Management, 181, 687–700. https://doi.org/10.1016/j.jenvman.2016.08.036