Is a house in architectural concrete warm?

Concrete itself does not insulate. Either a layered wall is used, with insulation in the middle and concrete outside, or concrete on both sides with every thermal bridge resolved. That is decided at concept stage.

Is architectural concrete more expensive?

Yes: formwork, mix and pace of work all cost more. In return, the finishing layer disappears inside and out, and the elevation needs no repainting.

How does architectural concrete age?

It shifts colour and takes on a patina, strongest where water runs down the wall. This is handled with eaves, drips and water management at detail stage, not with a sealer applied at the end.

Updated 7 October 2026

A house in architectural concrete: what to know.

Q: What is architectural concrete?

Concrete left visible: with no render, cladding or paint. It is structure and finish at once, so there is no layer under which a workmanship error can be hidden.

Architectural concrete is concrete left on show, no render, no cladding, no paint. It is structure and finish at once, so there is no layer under which a mistake can be hidden. That one fact governs everything else: how it is designed, who can build it, and what it costs.

What actually decides the result

The formwork. A concrete surface is a print of whatever it was cast in. The type of board, its arrangement, the spacing of joints, the pattern of tie holes, all of it stays on the wall permanently. That is why formwork drawings are architectural drawings, not purely technical ones, and why they are produced together with the elevation rather than after it.

One mix, one plant. Changing supplier or aggregate halfway through means a different colour of wall. Concrete from two plants on one elevation is visible from across the street.

Continuity of the pour. A break leaves a mark. Break positions are planned in advance and placed where they read as a deliberate division rather than a failure.

The contractor. The most important item on this list. Architectural concrete is done well or not at all, a crew that has never done it will be learning on your elevation.

Insulation: the question that always comes

Bare concrete does not insulate. There are two answers and both work, but they give different houses:

A layered wall: concrete outside, insulation in the middle, structure inside. The concrete is seen from the outside only.
Concrete inside and out: more consistent architecturally, harder technically, more expensive. Every point where the wall crosses to the other side has to have its thermal bridge resolved.

Choosing between them is a design decision taken at concept stage, not on site: it drives wall thicknesses, details and the whole cost estimate.

What it costs

More than render: there is no point claiming otherwise. Formwork, mix, pace of work and the care needed around reinforcement and cast-in services all cost more, because all of it will be visible. On the other side, an entire finishing layer disappears inside and out, and the elevation does not need repainting every few years. The difference depends on how much concrete is on show and how difficult the geometry is, a reliable number comes after the concept, not before it.

How it ages

It shifts colour and takes on a patina, most strongly under eaves, beside downpipes and wherever water runs down the wall. Some clients like precisely that, some do not. It is designed deliberately: with eaves, drips and the way water is led off the building, not with a sealer applied at the end. Hydrophobic treatment helps but does not replace a well-resolved detail.

When concrete makes sense

When the house is meant to be simple in form and strong in material, and the client understands that the patina is part of the purchase. When the budget has room for a good contractor, not only for the material. And when there is time: concrete cannot be rushed. If any of those is missing, well-executed render will look better than badly executed concrete.

In concrete there is no layer to hide a mistake under. That is why the result is decided by the contractor, not by the mix.

Łukasz Pastuszka, architect, co-founder of MOOMOO Architects

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