The greenest building is the one that already exists

For a long time, renovation was seen as the modest cousin of new construction: cheaper perhaps, but less ambitious. That view is changing quickly. Across Europe, North America and Latin America, more and more of the most interesting projects begin not with an empty plot, but with a building that already stands.

Why now?

The first reason is carbon. A large share of a building's lifetime emissions is released before anyone moves in, in the production of concrete, steel and glass. Keeping an existing structure means keeping that embodied carbon in place instead of spending it again. As the architect Carl Elefante put it, the greenest building is the one that is already built.

The second reason is economic. Empty offices, factories and warehouses sit in the middle of cities that need homes, schools and cultural spaces. Converting them is often faster than starting from zero, and many cities now support it with incentives and simpler approvals.

The third reason is cultural. Old buildings carry memory. A former factory or a stone ruin gives a new project a story that no render can invent.

A timely example

At the end of this month, Kanal - Centre Pompidou is scheduled to open in Brussels inside a former Citroën car factory. It is a reminder that reuse is no longer a compromise: it can produce some of the most ambitious public buildings of our time.

What it asks of architects

Reuse is not easier than new construction; it is different. It starts with listening to the building: its structure, its materials, its light and its flaws. Surveys and structural checks come before sketches. Some surprises only appear once work begins, so the design has to stay flexible. And often the hardest decision is what to leave untouched.

Our own experience

In our Coffee House project, the abandoned stone walls of a former hacienda became the starting point rather than an obstacle. The new structure sits within and above the old walls, so the history of the place stays visible while the building gets a new life.

If you own an older building and wonder what it could become, that is exactly the kind of question we enjoy exploring.

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Mass timber is moving into the mainstream