Carbon: The Start of the Story.

By now, most of us have heard the term carbon emissions, usually in relation to how we live and the idea of a personal or household carbon footprint.

In buildings, this typically refers to what is known as operational carbon. In simple terms, it’s the carbon dioxide equivalent emissions created through the day-to-day use of a home, such as heating, hot water, lighting, and electricity.

This is an important part of the picture, but not the whole story.

What’s often overlooked is the significant amount of carbon created before anyone ever moves in. The construction of a building is a major source of greenhouse gas emissions. As building regulations improve, homes become more energy efficient, and the electricity grid continues to decarbonise, operational carbon will keep reducing. Undoubtedly a positive shift. However, as operational emissions fall, the proportion of carbon created at the point of construction becomes increasingly significant.

This is what we refer to as embodied carbon. It includes the emissions created by extracting raw materials, manufacturing products, transporting them to the site, and assembling them into a finished building. Once that carbon is released, it cannot be taken back. It is locked in from day one.

Embodied carbon is a much harder challenge to address than operational carbon, largely because it sits beyond the direct control of most people. A thorough assessment means looking deep into supply chains and asking difficult questions. Where were materials made? How were they transported? What energy powered the factory? Were materials newly extracted or recycled? When you start applying this level of scrutiny to every element of a building, from structure to fixings, it quickly becomes clear how complex the picture really is.

At Hoose, we don’t pretend this is simple or solved. Instead, we see it as an area that demands honesty, curiosity, and continual refinement. We are constantly reviewing our material choices and supply chains, working towards what many still consider improbable. A home that dramatically reduces whole life carbon without relying on offsets or exported energy to balance the numbers.

One of the most effective places to start is with the biggest contributors. Materials like concrete and steel carry a high upfront carbon cost. Where possible, we look to reduce or remove their use and replace them with timber and other biogenic materials that store carbon rather than release it. This shift alone can significantly change the carbon profile of a home before it’s even occupied.

Alongside this, we continually question where materials come from, how they’re made, and whether there are less harmful alternatives available. This is not about finding a perfect solution. It’s about making better decisions, project-by-project, and steadily improving outcomes over time.

We are careful with the language we use around carbon for this reason. Rather than making claims that overpromise, we focus on what can be measured and meaningfully delivered today. A future blog will explore why we use the term carbon-storing, and what that means when we think honestly about the full life of a building, including what happens at the end of its use.

For now, what matters is this. If we want to build homes that genuinely support a healthier future, we need to look beyond how they operate and pay equal attention to how they are made. That is where some of the most important work now sits.