Six Carbon Saving Lessons From Around The World.

The construction sector now accounts for 33 per cent of global carbon emissions, up from 20 per cent three decades ago. Without significant intervention that footprint is projected to more than double by 2050.¹Li, C., Pradhan, P., Chen, G. et al. Carbon footprint of the construction sector is projected to double by 2050 globally. Communications Earth and Environment, 2025. Over half of those emissions originate from materials alone: cement, bricks, and metals whose carbon intensity is largely determined by decisions made early in the design process.²Li, C., Pradhan, P., Chen, G. et al. Carbon footprint of the construction sector is projected to double by 2050 globally. Communications Earth and Environment, 2025.

These increasing carbon emissions have consequences that extend beyond climate. Buildings that are carbon-intensive to construct and operate are increasingly costly to run, harder to retrofit, and at risk of falling short of the standards that tenants, investors, and communities now expect. At Woods Bagot, we see sustainability and beauty as inseparable: the most enduring buildings will be those that are responsible to the planet and genuinely inspiring to inhabit. Reducing carbon is not a separate sustainability objective, but rather a measure of whether a building will remain viable and worth caring about over its lifetime.

Across projects delivered in Australia, New Zealand, the United Kingdom, the UAE and Asia, our teams have been actively working with our clients and collaborators to address these challenges. The following six lessons reflect what those projects are revealing about reducing carbon in practice.

Use whole-of-life carbon modelling to inform retrofit decisions

The lowest‑carbon building is often the one already standing.

Whole‑life carbon modelling consistently shows that retaining and upgrading existing structures can deliver substantially lower emissions than replacement, even when new buildings are designed with high operational efficiency.

At The Hartby in Brooklyn, New York, Woods Bagot collaborated with Impact Futures on a comprehensive whole-of-life carbon assessment comparing a deep retrofit against a hypothetical new build on the same site. By retaining and radically upgrading significant portions of the existing structure, 71 per cent of embodied carbon was preserved. Even when factoring in operational carbon over 60 years, the retrofit avoided nearly half the emissions that a full demolition and rebuild would have produced.

Beyond carbon savings, working with existing fabric preserves cultural value, reduces demolition waste, and shortens delivery timeframes. The decisions that matter most – what to keep, what to improve and what to selectively replace — are design decisions that are most powerful when made early.

Substitute more sustainable materials to reduce embodied carbon

Material substitution is one of the most direct ways to reduce embodied carbon, and the range of viable low-carbon alternatives is broader and growing faster than ever before.

On The University of Tasmania Forestry Building, fly ash cement — a waste by-product of coal combustion that reduces environmental impact without compromising structural performance – replaced conventional Portland cement. Calcined clay incorporated into concrete mixes reduced emissions by approximately 80 to 90 kg CO₂ per tonne of cement replaced. Similarly, carbon neutral plasterboard was specified in place of traditional alternatives, and hempcrete replaced conventional wall systems, providing high acoustic insulation, fire retardant performance, and vapour permeability while remaining fully compostable at end of life.

At 21 Lombard Street in London, existing aluminium windows were replaced with timber composite stick curtain wall, while new façades were created with lightweight precast concrete paired with timber composite windows. These optimisations reduced the new façade’s embodied carbon by up to 48 per cent.

Overall, material substitution delivers the greatest benefit when tied to performance and durability, rather than treated as an isolated sustainability gesture.

Salvage and repurpose materials for new uses

The materials already on a site are often its most sustainable resource.

Recovering and repurposing materials from construction sites extends their life and reduces landfill waste, while avoiding the emissions associated with manufacturing and transporting new products. At Hang Seng Bank Headquarters Main Branch in Hong Kong, existing granite was transformed into new design features and 30-year-old glass was upcycled for use as a reception screen, diverting 160,000 kg of construction waste from landfill.

At Younghusband in Melbourne, the design philosophy was to touch the existing 122-year-old woolstore as lightly as possible — retaining heritage elements including decommissioned bail elevators, wool pulleys, original painted signage, and the distinctive sawtooth roof. Original brickwork was preserved and reused throughout, and removed Douglas Fir beams were de-nailed and planed by local makers Timber Trip before being reintegrated as handrail ledges and link bridges in public areas. Material reuse across the project resulted in an 84 per cent reduction in embodied carbon compared to similar reference buildings, equivalent to approximately 11.3 million kilograms of carbon savings.

Design for circularity to lower whole life carbon impacts

Designing for circularity allows buildings to adapt, change, and be partially dismantled over time, reducing whole‑life carbon impacts well beyond initial construction.

Circular design strategies focus on enabling disassembly, modification, and reuse of materials rather than locking them into permanent assemblies. At ANZ Adelaide, a circular economy wall-framing system was specified throughout the entire fitout — the first commercial office project in Australia to do so. Designed for disassembly and offsite fabrication, it enables future reconfiguration without generating construction waste. The team also retained 65 per cent of the base building ceiling tiles and 50 per cent of the carpet tile selection, further reducing the fit out’s overall footprint.

Working with Dexus, Woods Bagot developed the Forever Fitout — a modular system of durable components designed to be reconfigured across multiple tenancies rather than stripped out and rebuilt at the end of each lease. Traditional commercial fit outs can embed around 200 kg of carbon per square metre through repeated demolition and replacement cycles. The Forever Fitout is designed to break that cycle, and in 2026 became the first project certified under Green Star Fitouts, Australia’s new national rating tool with circularity as a core requirement.

The carbon benefit of circularity compounds over time, but only if the building was designed to allow it.

Dematerialise where possible to reduce structural carbon

The most sustainable material is often the one not used at all.

Meaningful carbon reductions can be achieved by using less material overall, without compromising function, capacity, or architectural ambition. At Western Sydney International (Nancy-Bird Walton) Airport, design refinements reduced the overall footprint, the number of front-facing columns, and the length of piers, while maintaining full passenger capacity. These changes delivered approximately 20 per cent less concrete and steel use and a corresponding reduction in embodied carbon.

At The University of Tasmania Forestry Building, mass timber served as both a structural and aesthetic element, eliminating the need for additional surface finishes. Joinery detailed without handles created integrated solutions that reduced material use while maintaining spatial quality and durability.

These projects demonstrate that restraint supported by careful detailing can strengthen both environmental performance and architectural clarity.

Generate renewable energy on site to reduce operational carbon

The best on-site energy strategy starts before a single panel is specified with a building designed to need less in the first place

At MC2 in Masdar City in the UAE, a photovoltaic canopy spanning the façade and roof was optimised through iterative studies to maximise energy generation, producing more energy than the building consumes. The campus was also shaped by an environmental grid designed to shade the public realm from the desert sun and channel natural breezes, reducing demand before a single panel generated a watt.

Heritage Lanes in Brisbane was designed as a net-zero carbon in operation office development, with base-building services powered entirely by renewable electricity. The façade is engineered to limit solar transfer, reducing heating and cooling loads throughout the year.

At Hang Seng Bank Headquarters Main Branch, an energised panel developed in collaboration with City University of Hong Kong converts kinetic energy from footsteps in the walkway into usable electricity. Combined with energy-efficient air-conditioning and natural lighting, the system contributed to a 20 per cent reduction in electricity use, supporting the project’s LEED and WELL Platinum certifications.

Across these projects, renewable energy is proving most effective when part of a broader approach that prioritises efficiency, passive performance, and reduced demand.