3.1 Circular Design Tools and Strategies for Planning and Decision-Making

3 AVOID

Avoid Waste, Build (with) Less and Improve Circularity

There are opportunities for circular design, recycling and re-use at each phase in the building life cycle.

Chapter 3

3.1

Circular Design Tools and Strategies for Planning and Decision-Making

3.2

Upstream Design Choices Are Key to Tackling Carbon Early

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3.3

Building Less by Prioritising Renovation and Use of Existing Buildings

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3.4

Focusing on End-of-Use, Not End-of-Life, to Avoid Landfill

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3.5

Design for Disassembly and Modular Construction

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3.6

(Re-)Use of Secondary Materials

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3.7

Recycling Only as a Last Resort

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3.8

Circular Strategies in New Buildings to Avoid Embodied Emissions

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Figure 3.1 Opportunities to reduce carbon at each phase of the building life cycle

Decarbonisation requires a change in use across all building materials.

Source: Keena, Rondinel-Oviedo and Acevedo De los Ríos 2023, adapted from Akbarnezhad and Xiao 2017.

Circular Design Tools and Strategies for Planning and Decision-Making

How we design our buildings is key to achieving a circular economy.

A circular economy for the built environment is rooted in design and decision-making (Keena and Rondinel-Oviedo 2022). Design decision-making during each phase of a building’s life cycle offers opportunities to reduce embodied carbon (see Figure 3.1). Key interrelated circular design tools and strategies include:

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upstream design choices (for example deciding on what to build, form, layout, materials etc.), including building (with) less and building smarter;

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selecting building materials and elements that have lower embodied carbon because they are either recycled/re-used or are inherently lower-carbon; and

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end-of-use strategies to avoid waste and enable the re-use and recycling of materials and components.

These strategies must be considered in tandem. For example, re-using materials as much as possible is a good start, but there is a growing gap between the available supply of and demand for recycled materials (see chapter 5). Therefore, a next good step might be to replace high-carbon materials with low-carbon renewable materials, such as bio-based materials. However, it remains unclear how the scaling of biomaterials, such as wood and bamboo, will impact the ability of regional ecosystems to sequester carbon. Bio-based materials are low carbon in their processing and use, but this must be accompanied by sustainable forestry and farming practices (Keena, Duwyn and Dyson 2022) (see chapter 4).