Price Guide

Your buyer’s guide to outside wall insulation

External wall insulation (EWI), also known as solid wall insulation, involves applying insulation material to the outside of your building’s walls.

This method not only enhances thermal efficiency but also strengthens weather resistance and improves aesthetic appeal – a win-win. However, what do you need to know before investing in insulation for external walls?

Types of insulation for external walls

Choosing the right external wall insulation systems depends on several factors: wall dimensions, desired thermal performance, and of course, your budget. Here are some top contenders to consider:

  • Rockwool mineral wool: A durable, soundproof, water-repellent, and breathable external wall insulation option. Although it is typically available in rolls, rockwool external wall insulation is compressed into rigid boards.
  • Expanded polystyrene (EPS): Made from polystyrene balls fused into a board, EPS is a popular choice due to its affordability, lightweight nature, and ease of installation.
  • Kingspan Kooltherm K5: A phenolic board known for its exceptional thermal performance. Though it comes with a higher price tag, its efficiency makes it a firm favourite.

With many options available, consulting a specialist ensures you find the perfect fit for your needs.

How thick do you need your external building insulation?

Wondering about the external wall insulation thickness requirements? Well, while 50mm of insulation can definitely boost your U-value, it’s not always the most effective choice. Opting for 100mm insulation can make a significant impact, delivering far greater energy savings.

The thicker the insulation, the bigger the savings. So, for maximum efficiency and cost reduction, 100mm is the way to go!

Benefits of insulation for external walls

Did you know most of your property’s heat escapes through its walls, especially if it’s a solid wall rather than a cavity wall? According to the UK Government’s Department of Energy and Climate Change, boosting your building’s energy efficiency with external wall insulation can increase its value by up to 38%. That’s a massive advantage, but here are a few more:

  • Fewer cold chills
  • Installation shouldn’t disrupt your business operations too much
  • Enhanced weatherproofing
  • Improved sound resistance
  • Reduced condensation

While it may alter your property’s appearance and require planning permission, external wall insulation is a surefire way to keep the cold out and the warmth in. Ready to upgrade? Talk to our specialists today.

Read more

Frequently Asked Questions

How much does external wall insulation cost?

The cost varies, but it mostly depends on the size of your property and the type of insulation you buy. Additionally, installation costs can vary based on the specific components required and whether scaffolding is necessary for your project. To get an accurate estimate, it's best to consult with a professional installer who can assess your property's needs.

Do I need planning permission for external wall insulation?

Generally, planning permission is not required for external wall insulation, as it is not classified as an extension. However, if the insulation significantly changes the exterior appearance of your property, or if your home is located in a conservation area or is a listed building, you may need planning permission. To ensure you comply with all regulations, it's advisable to consult your local planning authority before starting the installation.

Go to Top