Kirby Group Engineering Limited · Physical Exposure and Transition

Concrete + steel are the two heaviest contributors to embodied carbon. Decarbonisation pace of these sectors caps how fast contractors can cut project-level S3.

As a construction and engineering contractor, Kirby's largest carbon exposure sits in Scope 3 purchased goods and services and use of sold products, the categories that capture embodied carbon in specified materials such as cement and structural steel [E1][E3]. The evidence does not disclose specific cement or steel volumes, supplier names, or material-level embodied carbon data, so exposure to cement/steel supply chain decarbonisation pace cannot be quantified beyond the aggregate Scope 3 target categories [E1].

Kirby has SBTi-approved near-term targets, including a 35% reduction in Scope 3 emissions from purchased goods/services and use of sold products by 2034 against a 2023 baseline [E7][E1][E3]. This sits alongside a 60% Scope 1 & 2 reduction target and a 60% fleet emissions reduction target by 2034, addressing direct site and vehicle emissions rather than materials procurement directly [E4][E6][E8]. No disclosed programme in the extracted reports addresses supplier engagement, low-carbon concrete specification, or ResponsibleSteel-aligned procurement specifically.

Aggregates, copper, aluminium, rare earths for finishings. Mining S1+2 caps upstream Scope 3.

Sector-generic framing shown above — company-specific exposure narrative pending.

Operational performance of completed buildings depends on tenant fit-out + grid mix in the country of construction. Contractors have indirect leverage.

Sector-generic framing shown above — company-specific exposure narrative pending.

Excavators, generators, delivery fleet — direct Scope 1 that a contractor can move most quickly. HVO + battery-electric plant availability sets the timeline.

As a mechanical and electrical contractor, Kirby's direct footprint is concentrated in Scope 1 & 2 emissions from its vehicle fleet and site plant, which the company breaks out as a distinct target category alongside broader Scope 1 & 2 emissions [E1][E2]. No disclosed operational detail on specific plant types, HVO adoption, or electrification of excavators/generators is provided in the extracted reports, so the fleet decarbonisation lever here is limited to on-road/company vehicles rather than a full zero-emission construction site programme.

Kirby has set an SBTi-approved near-term target to cut Scope 1 & 2 emissions by 60% by end of 2034 from a 2023 baseline, with a specific sub-target of 60% reduction in fleet emissions by the same date [E1][E4][E5][E6]. This fleet target is codified under the Planet pillar of its new Sustainability Policy [E2][E3], alongside a separate 35% Scope 3 reduction target covering purchased goods/services and use of sold products [E7][E8]. No disclosed detail exists on the specific fleet transition mechanism (e.g., HVO, battery-electric vehicles, or route optimisation) used to achieve the 60% reduction.

Long tail of subcontractors + material suppliers carries most of the project embodied Scope 3. Credibility of tier-1 vendor targets determines pass-through.

As a mechanical and electrical contractor, Kirby's embodied-carbon footprint sits largely with its subcontractors and material suppliers rather than its own operations, so the credibility of those tier-1 vendors' climate practices flows directly into project-level emissions. The evidence shows Kirby's supplier engagement is currently scoped to key suppliers and subcontractors covering 50% of total procurement spend [E1][E2][E4][E5], meaning half of procurement-linked embodied carbon exposure sits outside this governance net. There is no disclosed operational detail on specific material categories (cement, steel, aggregate) or embodied-carbon clauses in contracts.

Kirby has committed that 100% of key suppliers and subcontractors, representing 50% of total procurement spend, will sign a Supplier Code of Conduct by end of 2027 [E1][E2][E4][E5], backed by annual risk assessments of top suppliers over the same spend base [E1][E3][E5]. In parallel, Kirby targets a CDP A rating for Climate Change by end of 2028, having reported to CDP annually without yet reaching A-list status [E6][E7][E8]. No disclosed programme extends supplier climate targets or contract climate clauses beyond this Code-of-Conduct and risk-assessment framework.