ePrivacy and GPDR Cookie Consent by Cookie Consent What is ICF (Insulated Concrete Formwork) construction?

What is ICF (Insulated Concrete Formwork) construction?

3 min read
Oct '25 • by Heather

Quick summary

ICF construction involves stacking hollow blocks on-site, reinforcing with steel, then pouring concrete to create a durable, well-insulated wall. It’s quicker than traditional methods, often completing within a few weeks, and costs around £1,200 to £1,800 per square metre, including VAT. While it’s eco-friendly in energy use, concrete’s carbon footprint is higher.

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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