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Much ink has been spilt in recent years over the cost of carbon emissions and a great deal of time and effort, particularly in the built environment, has been devoted to putting those costs into accurate numbers. But, if we are going to think about the carbon issue in such pecuniary terms, then why not make it the responsibility of those in the sector with the most experience of measuring, predicting and keeping a handle on costs?

That at least is the idea behind a new tool developed by global consultancy Turner & Townsend. The firm wants to put the assessment of carbon emissions in the hands of cost consultants and hopes its new Embodied Carbon Calculator, a bespoke software tool which tracks the carbon footprint of projects from design to completion, will be the first step to achieving that.

T&T director Steve Waltho, who led the development of the tool, explains: 鈥淲hat we wanted to do is look at the way in which you could have a broader-scale impact on reducing carbon across construction. So, rather than carbon being the preserve of specialist sustainability consulting teams, which it has been historically, we wanted to do something in a way where you could create a much [more] widespread impact and do that with some real pace and scale.鈥�

According to Waltho, cost managers are perfectly placed to take up this challenge. He says: 鈥淲e鈥檙e trained as cost managers to manage and effectively reduce cost through the design and the build process.

鈥淪houldn鈥檛 it also be the case that we are best-placed then, in parallel and integrated with the cost conversation, to actually help mitigate and reduce carbon expenditure through that same process?鈥�

Tristan Harvey-Rice, director of cost intelligence at Aecom, agrees that the 鈥渧ery siloed鈥� approach typically taken over carbon and financial costing has often limited organisations.

The consultant worked as an expert technical advisor for the development of a cost-carbon tool for the Environment Agency, which was rolled out earlier this year, and according to Harvey-Rice the firm has 鈥渁 number of tools at various stages of development鈥� which jointly assess carbon and cost.

While he was sceptical that there is a one-tool-fits-all solution 鈥� he points out that 鈥渢here are different solutions in different sectors based on different constraints and different requirements鈥� - he agreed that calculation of the two metrics will increasingly go hand-in-hand on projects.

There鈥檚 a tidal wave of this coming, so it needs to be rolled out sooner rather than later

David Lane, director, Thomas & Adamson

鈥淚 think it will follow the same journey that cost has gone through in that it will go through increasing levels of confidence and accuracy, and refined data-sets, standardisation of approaches,鈥� he says.

Some cost consultants, such as Thomas & Adamson, have looked outside their own business for embodied carbon expertise 鈥� the firm recently started offering a cost-carbon service using a third-party embodied carbon calculation tool called One Click.

Director David Lane said the firm was responding to client demand, with the cost consultant first receiving interest in the service around a year ago.

鈥淭here were three or four sort of clients and a couple of consultants asking the question around about the same time that made us obviously sit up and pay a bit of attention to it,鈥� said Lane.

鈥淲e think there鈥檚 a tidal wave of this coming, so it needs to be rolled out sooner rather than later, because we鈥檙e only going to be asked the question more and more as we start to head towards clients and government targets for sustainability over the next four, five or so years.鈥�

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According to Simon Sturgis, founder of carbon consultancy Targeting Zero, the idea of merging financial and carbon cost management is not a new one and is something that the Royal Insititution of Chartered Surveyors has been 鈥渒een on since probably 2017鈥�. However, he says that the development of a tool which merges the processes is an innovation.

A planned update to the RICS professional statement of carbon calculating, which Sturgis is leading, is set to include a direct correlation between carbon and the international cost measurement standard and he says that the direction of travel is towards greater responsibility for carbon being placed on the shoulders of cost managers.

The T&T calculator is designed to follow established project planning stages, beginning from the the RIBA stage 2. It is also aligned with the RICS New Rules of Measurement 1 and third-party standards such as the UK Green 好色先生TV Council, as well as benchmarking performance against industry targets proposed by LETI.

鈥淥ne of the things we鈥檝e tried to do in this is make this really clear, plain English,鈥� says Waltho. 鈥淪o that you can take it into a client who is either expert or inexpert in the field, and everybody would be able to understand how the building performs and what they might need to do in terms of improvement and performance.鈥�

Waltho says that the scale of a big firm like T&T will help them to build up a large amount of benchmarking data more quickly.

Over time, use of the tool on projects will help the firm build a significant database of carbon values and the performance of projects, giving consultants better insight into what works and what does not.

He adds: 鈥淲here you鈥檝e got other tools, they鈥檙e either a niche or consultancy. So they haven鈥檛 got the scale to be able to respond to global clients, big portfolio clients, or that widespread nature that is needed to meet the urgency.鈥�

What鈥檚 more, making carbon the preserve of the cost consultant creates efficiencies by avoiding duplication in measurement of buildings, as carbon-related measurements can be taken as part of their normal surveying process. 

However, Sturgis says that, when it comes to carbon, a certain amount of duplication could be 鈥渁 good thing鈥� for architects, structural engineers and service engineers.

He suggests that in giving cost consultants responsibility for carbon calculation, 鈥渢here鈥檚 a danger that might stop architects and engineers structural and MEP from examining their own carbon issues鈥�, arguing that cost consultants may not be able to give the kind of immediate day-to-day feedback on design necessary to keep carbon costs down over the lifetime of a project.

In other words, just because cost consultants are thinking about carbon, doesn鈥檛 mean architects and engineers shouldn鈥檛 be.

Design consultancies, architects, engineers should be understanding on a daily basis what the carbon impacts of their design choices are

Simon Sturgis, founder, Targeting Zero

鈥淚 think that鈥檚 really good, I think, if when a service is engineers designing services for building that they can figure out not not only the energy use, but also the carbon cost,鈥� says Sturgis.

鈥淟ikewise architecture, they should know the carbon cost of facades and interiors and what have you, and be able to understand the carbon impact. It鈥檚 pretty easy to say, well, somebody else is working that out and it鈥檚 not my problem, but I think it should be our problem鈥�.

鈥淒esign consultancies, architects, engineers should be understanding on a daily basis what the carbon impacts of their design choices are. So it鈥檚 not to say you don鈥檛 have somebody officially producing a carbon calculation, but if architects don鈥檛 understand the difference between one brick and another, or between two different types of steel that鈥檚 not good鈥�.

This kind of day-to-day advice on designing out embodied carbon could be the future for specialist sustainability consultants and Waltho believes the cost consultant鈥檚 new responsibilities will give such firms space to focus on solutions.

鈥淚t鈥檚 just [鈥�] a more productive way of getting the measurement done that allows you to do the assessment, and then [they] can concentrate on the route to improvement,鈥� he says.

The increasing combination of cost and carbon measurement could have impacts down the construction supply chain too.

Graham Findlay, another Thomas & Adamson regional director, said sustainable material sourcing could become the clincher for subcontractors in tender battles and has been urging contractors to engage with suppliers early on to ensure sustainability is prioritised.

He said: 鈥淸Suppliers and subcontractors] are the ones who鈥檒l be buying the materials at the end of the day. And when you look at embodied carbon, there鈥檚 lots of aspects to it, such as transport costs, and the carbon that鈥檚 gone into creating the material.鈥�

Waltho believes that it is only a matter of time before carbon becomes a standard part of the cost manager鈥檚 responsibilities and expects planning policy will soon require embodied carbon to be considered by planners.

He says: 鈥淚 do genuinely think we鈥檙e right at the forefront, a bit of a vanguard on this [鈥�] of saying, actually, it鈥檚 time to shift again.

鈥淭he last shift we had was cost planning. Now it鈥檚 carbon.鈥�