Underfloor insulation will help to reduce heat escaping through the floor and stop cold draughts from coming up through the floorboards. It’s easier to insulate your floor if you are replacing it, but insulation can also be retrofitted.
Insulating your floor will make it more comfortable underfoot and you’ll also save money on your heating bills. The energy-efficient insulation will mean you don’t have to keep turning up your thermostat to keep warm.
In this guide, we’ll tell you the average price of installing underfloor insulation, what affects the costs, how you can save money, the advantages and disadvantages of underfloor insulation, what’s involved in installing underfloor insulation, how to find and hire a tradesperson to install your underfloor insulation and what questions to ask them.
Finally, we’ll answer some of your frequently asked questions.
How Much Does Underfloor Insulation Cost?
In the table below, we’ve broken down the average cost of underfloor insulation by house size.
|House Size||Estimated Cost||Time Required|
|Small Flat||£510 to £734||1 day|
|Terraced House||£800 to £1,150||1 to 2 days|
|Semi-Detached House||£1,200 to £1,725||2 to 3 days|
|Detached House||£1,600 to £3,000||3 to 4 days|
A handyperson or an insulation installer will be able to do the job easily if you’re hoping to hire a professional. A tradesperson will charge between £120 and £160 a day.
When you need a tradesperson to install underfloor insulation use HouseholdQuotes. Simply fill in the online form and tell us briefly what you need.
We’ll then find tradespeople to give you no-obligation quotes, fast.
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What Affects the Cost of Installing Underfloor Insulation?
Several different factors are going to have an impact on the cost of installing underfloor insulation. We take a closer look at these factors below.
Size of the Room
The bigger the room the more insulation you will need, making it more expensive. For example, as you can see from the table, if you were insulating the floors of a flat with 60 square metres then you are likely to pay between £510 and £734.
However, a terraced house that also requires insulation will cost between £800 and £1,150 as it is bigger.
Type of Insulation You Choose
Insulation is very affordable, but the type you choose will influence the price. There are various types of floor insulation, and they include:
Blanket Insulation (Batt)
You buy blanket insulation in a roll. It is a common type of insulation.
You lay blanket insulation between the joists, so you can use it if you are installing insulation from your basement.
Blanket insulation is sold in felt, rock, mineral fibre, or glass. A more expensive material is sheep’s wool.
Felt is a cost-effective type of insulation. Thermal ceramic felts are fire resident and good for soundproofing.
Rock mineral is made from a variety of raw materials and rock which is melted down and made into fibres. It’s fire-resistant and good at absorbing sound.
This includes rock wool and stone wool. It contains a high amount of recycled materials and is an excellent material to use for soundproofing.
Glass insulation is made from recycled glass and sand. It contains plenty of air pockets and is also good for soundproofing.
Sheep’s wool is a natural fibre and doesn’t cause skin or breathing problems during installation. It also absorbs water and is good for soundproofing.
The insulating board can be cut to size and placed between your joists if you have removed your floorboards.
PIR Insulating Boards
These boards go on the top of a concrete floor. They are thin and lightweight making them easy to install.
The Need to Renew Skirtings, Reduce Door Heights and Move Radiators
If you are insulating a concrete floor your floor level will be raised. Skirtings will have to be removed and then refixed and radiators may need to be put into a new position.
A carpenter can help you to heighten your door and remove and replace your skirtings. Carpenters charge between £15 and £22 an hour or between £120 and £176 a day.
A heating engineer charges between £30 and £60 an hour or £240 to £480 per day.
If you live in and around London or in the South East of England, you are likely to pay more money for services. You should add between 10% and 20% to any installation costs by a tradesperson.
How Can I Save Money on Underfloor Insulation?
You can do it yourself if you are competent at DIY. It might take you longer to do the job, especially if you are pulling up floorboards.
By doing the job yourself you could save between £120 to £160 a day.
If you don’t have the time, then use a professional.
When you need a tradesperson for your underfloor insulation installation, use HouseholdQuotes. Fill in the online form and tell us what you need.
We’ll find you tradespeople in your area to give you no-obligation quotes for the job.
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Is Underfloor Insulation the Right Choice for My Home?
Below we look at the advantages and disadvantages of underfloor insulation to help you make a decision regarding its installation in your property.
- Reduces heat loss
- Improves soundproofing
- Makes it warmer underfoot
- Can cause damp if you don’t use a breathable insulation material and you cover up the ventilation points
What’s Involved in Installing Underfloor Insulation?
The insulation needs to be measured and cut to size before it’s laid down.
There are three ways you can install underfloor central heating:
- If you have floorboards, you can take them up.
- If you have a concrete floor but with a basement underneath you can do it from inside the basement.
- If you are fitting insulation on a concrete floor from the room, you can lay an insulating board.
Fitting Insulation Boards Under the Floorboards
The carpet will need to be removed and you will need to lay the underlay if you have it.
Remove the floorboards. Take the insulation boards and cut them to size.
Fit the insulation boards between the joists and then replace the floorboards.
Lay new silver-backed underlay which will increase thermal efficiency and relay the carpet.
Fitting Rolled Installation From the Basement
Make sure no obstructions or nails stick through the joists.
Roll out the insulation and put it between the joists.
Keep it in place with netting which will stop it from falling from between the joists and onto the floor.
Laying Insulating Board on a Concrete Floor
Take up the carpet and the underlay.
You will then need to clean the floor and lay a damp-proof membrane over the whole floor.
Measure and cut the amount of insulating board you need.
Lay and fix the insulating board onto the concrete floor and make sure you don’t have any gaps. You can use insulating tape or glue for this.
Lay chipboard over the insulation boards and glue into place. Add a layer of concrete screed and leave to dry.
Relay the underlay and the carpet.
How Do I Find and Hire a Tradesperson to Install Underfloor Insulation?
If you get a recommendation from a family member, a friend, or a work colleague it will save you time.
Otherwise, you can use HouseholdQuotes. All you need to do is fill in the online form and tell us briefly what you need.
We’ll then find local tradespeople to give you no-obligation quotes for your underfloor insulation.
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Ensuring the Professional Is the Right Fit
Get all your quotes in writing and make sure each one is for the same job scope. That way it will make it much easier to compare quotes.
We suggest you ask tradespeople the following questions:
- Do you have a website? It’s not vital to have a website but it is useful because it might contain case studies or photographs of previous work and customers’ comments.
- Have you got a portfolio with photos of your work and customer testimonials? If the company or the tradesperson doesn’t have a website, you can ask them if they have a portfolio where you can look at photos and customer feedback.
- Are you a member of a trade association? A professional insulation installer might be a member of the National Insulation Association (NIA). Most tradespeople who belong to an association are committed to providing high-quality workmanship.
- Have you got Public Liability Insurance? All tradespeople should have insurance. Public Liability Insurance will cover them if there is an accident while the work is being carried out.
- How much experience do you have installing insulation? If it is important for you to know whether you are dealing with an experienced tradesperson or one who has just finished training, then ask this question.
Use the checklist below to take the best steps towards hiring a professional for your own underfloor insulation installation:
- Check what type of floor you have (you may need to take up an area of carpet for this)
- Decide the type of insulation that would be most suitable for your floor
- Get quotes from a floor insulation tradesperson (HouseholdQuotes can help you with this!)
- Choose whether to ask for supply and fit or simply installation
- Compare the quotes
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Frequently Asked Questions
How Much Money Can I Save With Underfloor Insulation?
Homeowners in Northern Ireland could save between £30 and £80 a year.
Do I Need Building Regulations Approval for Underfloor Insulation?
You can achieve this by installing around 70mm of foam board insulation or 150mm of blanket insulation.
Can You Insulate Any Type of Floor?
Can You Use Underfloor Insulation Anywhere?
That’s why upper floors don’t need insulation because they are already heated from below.
How Much Heat Is Lost Through the Floor?
Does Underfloor Insulation Cause Damp?
How Long Does Underfloor Insulation Last?
Rockwool, for example, gives a 30-year warranty.
What Does BBA Approved Mean?
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