In this guide
Use this material to examine your own work. Confirm current requirements, forms and dates with ICE before applying.
Explain how sustainability changed your engineering decisions. Consider the whole life of what you built, including effects beyond construction.
Sustainability in decisions
Explain how sustainability affected what you did, considering the whole life of the asset.
The Chartered extension
The CEng extension requires a professional and responsible role in reducing resource demand across the life cycle. ICE identifies the Climate Emergency as central to civil engineering and uses the UN Sustainable Development Goals as a framework. Discuss adverse impacts as well as benefits, including where your project worked against a goal.
What strong and weak evidence look like
Look for
- A quantity you reduced (concrete, steel, excavation, imported fill) and the design decision that reduced it.
- A carbon comparison you carried out, with the assumptions you had to make and how much they mattered.
- A whole-life argument that beat a lower capital cost, or one that lost and why.
- Reuse of an existing asset instead of replacement, and the assessment that made it defensible.
- An honest account of a project's negative impact and what was done to limit it.
- Adaptation as well as mitigation: designing for the climate the asset will live in.
Watch for
- Listing the UN goals a project touches, with no decision attached.
- Sustainability described entirely as recycling site waste.
- The project's sustainability strategy quoted as your evidence.
- "We used low-carbon concrete" without the comparison that justified it.
- Claiming carbon savings with no idea of the baseline.
A decision that changed because of carbon
Fictional example: structures, consultant, industrial slab replacement
Sustainability was a key consideration throughout the design and we specified low-carbon concrete in line with the client's net zero commitments.
The default was full removal and replacement of a 3,200 m² slab. I ran a comparison: replacement was roughly 310 tCO₂e including disposal and new concrete; an overlay on the sound two-thirds with local replacement of the failed bays came out around 120 tCO₂e. The overlay raised the finished level by 90 mm, which mattered at two door thresholds, and I had to check the additional load on the piles. It went ahead. The number I am least sure of is the disposal factor — it dominated the difference, and I would want better data before I quoted the saving as precisely as that.
There is a baseline, a comparison, a real constraint the candidate had to resolve, and an honest statement about which assumption the answer was sensitive to. That last part reads as competence, not weakness.
Questions to ask yourself
- What did I do differently because of sustainability?
If the answer is nothing, the evidence is not there yet, and that is worth knowing early.
- What is the biggest source of carbon in what I designed or built?
Reviewers often start here. Not knowing suggests the analysis was somebody else's.
- What happens to this asset in fifty years?
Whole-life thinking is explicit in the CEng extension.
- Where did my project make things worse?
ICE asks members to consider negative impacts as well as positive ones. Candidates who only claim benefit sound unconsidered.
The same area, in different kinds of work
| Setting | What the evidence tends to look like |
|---|---|
| Structures | Reducing a foundation or a frame through better ground information or a revised load path, with the saving quantified. |
| Highways | Choosing in-situ recycling over full reconstruction, and understanding what that meant for durability and future maintenance. |
| Water | Choosing a nature-based or catchment solution over hard engineering, and being clear about the residual performance risk. |
| Asset management | Extending an asset's life through intervention rather than replacing it, supported by condition evidence. |
Illustrative. The area is generic by design: ICE says the attributes can be achieved in a range of ways by anyone working as a civil or infrastructure engineer.
Whole life, including the part that is worse
Fictional example: flood risk, client organisation
The scheme delivered significant environmental benefits and contributed to UN Sustainable Development Goals 11 and 13.
The hard defence protected 340 properties, and it also cut off a stretch of intertidal habitat that will not come back. We offset part of it with managed realignment upstream, but the honest position is that the offset is smaller than the loss and it will take fifteen years to establish. I argued for the realignment area being extended, and lost, because of land acquisition cost. I record it because the alternative — writing this up as a straightforward environmental win — would not be true.
ICE asks members to consider the impact of their work on the UN goals throughout the project life cycle, including where it is negative. A candidate who can describe the harm as well as the benefit reads as someone who has thought about it.
An evidence-planning exercise
Written for a notebook rather than a submission. Anything you cannot answer is a development action, not a writing problem.
How interviewers tend to approach this area
- Asking what you personally changed, not what the project claimed.
- Asking where the carbon in your project sits.
- Asking how you would balance a client's cost target against a lower-carbon option.
- Moving from your project to the industry's wider decarbonisation challenge.
There is a large bank of original practice questions in the question bank, filterable by area and by level.
Official sources
Selected publisher pages were rechecked in September 2026. Other source records were last checked in July 2026. Open the latest official document before relying on a requirement.