Will Tariffs Push Up UK Building Costs?

If you’re planning a home extension, loft conversion, or renovation in 2025, you may have heard about new import tariffs introduced by the U.S. While they don’t apply directly to the UK, they could still affect global supply chains—and that means your build might end up costing more.

Here’s what’s going on, and what you can do right now to stay ahead.

If you want a baseline budget before speaking to contractors, use our extension cost per square metre guide.

What’s Happening With Tariffs?

In early 2025, the U.S. brought in new import tariffs—10% on most goods and 25% on steel and aluminium. These changes are expected to cause price shifts across global markets as suppliers react and trade routes shift.

While the UK isn’t imposing similar tariffs, changes like this can still create supply issues, delays, and cost uncertainty—especially for imported materials.

Could This Affect UK Building Prices?

Yes, potentially—but it depends on the materials and supply chains involved. Here’s how:

• Some materials (like steel or timber) might rise in cost due to increased global demand.

• Others could fall in price temporarily if suppliers redirect stock to the UK.

• Most worryingly, there’s growing uncertainty, which can lead to delays and higher quotes from cautious builders.

What Can Homeowners Do to Keep Costs Down?

You can’t control tariffs, but you can control how you respond. Here’s how to protect your budget:

Shop Around for Quotes

Don’t settle for the first builder. Prices vary widely—and comparing quotes can save you thousands. Our checklist of questions to ask before hiring a builder can help you compare like-for-like.

Act Sooner, Not Later

Lock in prices now before materials become more expensive or harder to get.

Get Fixed-Price Contracts

Avoid surprises—choose builders who commit to a clear, up-front cost.

We Make Comparing Quotes Easy

At MyBuildMyWay, we help UK homeowners get 3 competitive quotes from established local builders—fast. Whether you’re still in the design phase or ready to build, we take the hassle out of finding the right team. Start your project here.