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What is ICF (Insulated Concrete Formwork) construction?

3 min read
Oct '25 • by Heather

Quick summary

ICF construction typically costs more than traditional methods but can be cost-effective at around £150-£200 per square metre (including VAT) for a standard build. It offers quick turnaround times, often completed within a few weeks even in bad weather, making it a practical choice for faster, energy-efficient homes, though it requires experienced contractors and has a higher upfront environmental impact due to concrete.

Though it’s been around since the 1970s, only now is ‘Insulated Concrete Framework’ building starting to gain some mainstream appeal - and it’s not hard to see why.

Durable with bags of insulation, this lego style form of construction is slowly building a following in the UK. If your contractor or architect has mentioned ‘ICF’ construction to you, here’s everything you need to know…

What is Insulated Concrete Framework construction?

Though it may sound technical, the basic principle is pretty simple. Hollow blocks (also called ‘forms’) are stacked together on-site and then reinforced with steel beams to lock them into place. Concrete is then poured into the structure, filling up the spaces to create your new home.

This process sets ICF apart from traditional UK practices. While it has seen a big uptake in North America and Germany (where it originated), this country has tended to stick to what it knows: stone masonry and timber frames.

However, things are changing as many UK homeowners and businesses start to learn about the pros of this way of building.

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