AJ Retrofit Live and Circular Build 2024
- 11 September 2024
- 11:35 – 12:05 BST
- London
Net zero carbon
Is ‘net zero carbon’ a phrase? A political slogan? A commitment? A challenge? To us, as a purpose-driven partnership of engineers and sustainability consultants, and working as we do in a construction industry that contributes more CO2 emissions per year than aviation, it’s an imperative.
But what does it mean? What is a net zero carbon building in reality? Is ‘net zero carbon’ something you can buy for your building – a service just like acoustics consultancy or Post Occupancy Evaluation, or a design approach like Passivhaus?
About net zero carbon
In truth, ‘net zero carbon’ is a recipe. A net zero carbon building must first be net zero in operational carbon. This typically means using 75% less energy in heating, cooling, and lighting than a typical building, by prioritising passive environmental design strategies, embracing all-electric engineering designs, and maximising the use of on-site renewable energy (solar PVs). A Passivhaus approach is usually the lowest risk approach to achieving this in practice.
A net zero carbon building must also have low embodied carbon – significantly less than a standard construction today, in line with the UK Net Zero Standard. We have been at the forefront of measuring embodied carbon for several years. We provide design advice at the start of the project to set the embodied carbon strategy; support the design development with optioneering; carry out detailed embodied carbon modelling during design and post-completion; and monitor during construction.
Only once both operational and embodied carbon emissions have been reduced to the agreed efficiency standards for those building types, can the remaining carbon be offset using a recognised framework. And only if designed to meet the UK Net Zero Carbon Buildings Standard efficiency levels in construction and operation, can the building be verified as net zero carbon.
Soft Landings and Post Occupancy Evaluation are the final ingredients in a truly net zero carbon building. They ensure that the in-use performance targets set at the earliest project stages are being met in practice: we measure a building’s ‘as-built’ energy consumption; and fine-tune its operation, user comfort, and energy efficiency.
For owners of estates or those with large portfolios, a strategic decarbonisation approach may be required. We look at our clients’ portfolios and advise on the most appropriate route to net zero carbon, considering the practicalities, any planned preventative maintenance, and the economics of delivery.
We have been at the forefront of designing to mitigate the Climate Emergency for decades. All five of our own offices have been verified as net zero carbon by the UKGBC since 2019; we design without fossil fuels as the default; and we are leaders in the national conversation on sustainability in construction. We are well-placed and willing to help our clients navigate the often-complex pathways to achieving and verifying net zero carbon in buildings and portfolios. We offer a workshop to all our clients to start them on this journey as part of the value we add on all projects.
Case studies
Total of 4 projects
Related journal entries
Footprint+ 2024: Xylo
- 9 May 2024
- London
All services
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All buildings should be comfortable and a pleasure to be in: warm, well-lit, well-ventilated, well-used, and well-loved. Our mechanical and electrical engineering, vertical transportation, acoustics, daylight, and lighting design services can help ensure just that. We maximise passive measures such as natural ventilation and daylighting, seamlessly dovetailing our designs with the building’s own form and architecture to result in simple, low-energy, and low-cost building services.
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In the face of an increasingly urgent climate emergency, it’s crucial that buildings consume as little energy as possible in their operation. Low energy, low carbon, and low operational costs are our watchwords when it comes to designing new buildings or retrofitting existing ones. We help our clients build sustainability goals into masterplans or early-stage feasibility studies, decarbonise existing estates, and optimise how a building performs against its targets for sustainability and user comfort.
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Meeting net zero carbon targets and minimising a building’s impact on the environment means reducing embodied carbon – the carbon tied up in the materials like steel, concrete, and plastic that go into a building’s construction and services design – as much as operational carbon (the carbon a building produces in its heating, cooling, and lighting). We facilitate material reuse with circular economy strategies, steer low embodied carbon design from the earliest project stages with whole life carbon assessments, and offer advice on planning and compliance, all helping to reduce the carbon footprint of construction.