Insulation Cost Guide

Before you get started with an insulation project, or any type of home improvement work, we’d recommend finding out how much it’s going to cost. This will make it much easier for you to plan your project and work out what you can afford. We’ve compiled an insulation price guide to help you estimate the cost of your project.

General advice

Research thoroughly

Start your project by doing some careful research. Which parts of your home need insulating? If it’s the walls, do you need cavity, internal or external wall insulation? And if it’s the roof, would you like to create a cold roof or a warm roof? Knowing these details will make finding prices and organising your project much easier.

Set a budget

You should also set a budget before you get too far into your project. This will help you keep a handle on costs and avoid underspending or overspending. It’ll also prevent you from spending time investigating products and services that you haven’t got the money for.


Insulation costs can vary quite a lot so it can be pretty tricky to tell how much an insulation project’s going to cost without getting a professional involved. However, here’s a brief insulation price guide to give you a idea:

Type of insulation Approx. cost (including supply and installation) in 2024
Loft Insulation Cost £250-£400
Cavity Wall Insulation Cost £300-£750
Internal wall Insulation Cost £4,000-£13,000
External wall Insulation Cost £8,000-£22,000

When you do get round to getting quotes, make sure you get in touch with multiple professionals. You can compare the prices they give you and work out what’s the best deal. The size of your property can alter the prices you get quite a bit, so make sure this is detailed in the quote.

This insulation price guide should give you an idea of how much your project will probably cost. To get in touch with insulation professionals in your area, fill in our online form. We’ll find you up to 4 local pros.