Roof Insulation Cost Guide

Many homeowners find that their loft soon transforms into a dreaded baron storage area. However, with a small investment, it may be transformed into a highly efficient layer of insulation, keeping your house warmer throughout the winter months. This article will discuss how much roof insulation cost, what factors into roof insulation costs, how to save money on roof insulation, which type of roof insulation is best, what goes into roof insulation and how to find and hire a professional. 

The various types of roof insulation, including warm roof insulation, and fibreglass roof insulation, as well as the cost of hiring a roof insulation specialist, are all covered in this guide.

Roof Insulation Cost Guide
Roof Insulation Cost: Source:

How much does roof insulation cost?

Depending on the size and scope of the project, the cost to install roof insulation in the UK is anticipated to range from £400 to £600. When estimating the cost of adding roof insulation to your home, there are a lot of elements to take into account.

The roof insulation cost for a terraced home can range from £400 to £2,000. Between £135 and £195 for blanket insulation, £190 to £250 for loose-fill insulation, £270 to £350 for sheet insulation, and £1,400 to £1,800 for blown fibre insulation.

On the other hand, the roof insulation cost for semi-detached homes can range from £600 to £3,000. It costs between £200 and £250 for blanket insulation, between £300 and £400 for loose-fill insulation, between £450 and £650 for sheet insulation, and between £2,500 and £3,500 for blown fibre insulation.

Due to the large amount of roof space that detached homes must maintain, their costs are the highest of our three categories, ranging from £900 to £5,000. The price ranges from £250 to £350 for blanket insulation, £400 to £550 for loose-fill insulation, £550 to £750 for sheet insulation, and £3,000 to £4,500 for blown fibre insulation.

Cost of installing roof insulation

The type of roof you have and the materials used will usually affect how much it will cost to install roof insulation. The roof of your property can be insulated using a variety of techniques and materials.

We have provided a few examples below to help you understand how the various variables will affect the fee.

Please be aware that the prices listed in the table below are just estimates and should only be used as a general guide or example. The most exact cost for your project can be determined by getting a quote from a qualified roofer.

Fibreglass InsulationPitched Roof20 Square Metres1 Day or Less£400-£500
Mineral Wool RollsPitched Room20 Square Metres1-2 Days£500-£600
Warm Deck Insulation BoardsFlat Roof20 Square Metres1-2 Days£600-£700

Labour cost of installing roof insulation

Labour costs typically range from £200 to £400 per day, with blown fibre insulation installers charging more because of the specialised equipment needed.

A terraced or semi-detached house’s insulation should be completed in three to four hours by installers, however a detached home will likely take longer due to its size and require between four and six hours to finish.

Process Involved in Starting a Roof Insulation Project

The simple process of installing roof insulation significantly prevents heat from escaping from your home. Although the installation procedure itself can be rather simple, we always advise hiring a qualified, experienced tradesperson to complete the task for you in order to get the finest results.

You should first be aware of the steps involved in the procedure before choosing a certified contractor to put insulation on your property’s roof. The type and size of the roof that has to be insulated will be determined by a roof installation professional before you hire a tradesperson to complete the installation for your property. When choosing the level of quality and materials you want to use, they will go over all of your alternatives with you.

Feel free to ask your roofer how each material will benefit your home, and always be sure to bring up the pricing differences between each technique. An expert contractor will have no trouble advising you on the techniques and supplies they suggest for your particular set of circumstances. 

  • Before beginning the installation, they will examine the ease of access to your roof and look for any failed insulation that may need to be removed.
  • They will then make sure that there is no condensation or dampness in the attic space, which could compromise the effectiveness of your new insulation.
  • A skilled roof insulation crew can start installing your new insulation once the area is tidy and clear of any obstacles.

It’s best to speak with your professional first to get their opinion on how long the job will take and what’s involved. This will depend on whether or not you have existing insulation that can be added to or dangerous insulation like asbestos that needs to be removed before the fresh material is put in.

Different types of Roof Insulation

The utilisation of numerous different roof insulation techniques and materials is possible, as we briefly discussed before. One of the most effective strategies to conserve energy and lower household operating costs is to insulate the roof of your home. A well-insulated home is predicted to save the owner a staggering £250 in annual energy costs.

Fibreglass Wool Insulation

Fibreglass wool is the material of choice for roof insulation among homeowners. Heat and spinning are used to make a thick fibre that resembles wool from thin glass strands.

This top-notch insulator is an affordable option that can be bought in lengthy rolls, making it a sensible choice. Fibreglass wool insulation typically costs about £25-£30 per square metre.

The other option is mineral wool insulation, which is much like fibreglass. In this instance, heated and spun repeatedly minerals like dolomite are used to produce a dense, wool-like fibre.

Mineral Wool Insulation

Rock or mineral wool insulation, which costs about £20-£30 per square metre and can be obtained in huge mats or rolls like fibreglass, is another cost-effective choice. You might want to think about using sheep wool insulation if you’re seeking a more environmentally friendly choice. Sheep wool is offered in huge rolls, just like rock and fibreglass wool. 

However, purchasing this natural alternative will cost you significantly more, possibly between £50-£60 per square metre. When compared to other forms of insulation, sheep wool is significantly more pleasant to deal with and less irritating.

Polyester Fibre Insulation

Rolls of plastic or polyester fibre insulation are less hazardous to handle than sheep wool insulation and are comparable to that material. They are also a more environmentally responsible option because they are frequently produced from recycled materials. Sheep wool insulation is typically more expensive than plastic and polyester insulation, which is why fibreglass is more economical. Polyester insulation will typically cost about £35 per square metre.

Factors that affect roof insulation cost

Knowing the cost factors will help you stay on top of your finances while receiving the insulation you need if you’re working hard to stay within a budget when insulating your loft.

Choice of insulation

Like with other renovations, there are decisions to be made. Your first (and most important) decision is the type of insulation you select.

Although each type has advantages and disadvantages, from a financial perspective, blanket and loose-fill insulation come in at between £150 and £200, making them the least expensive options.

The most expensive option for your heating needs is blown fiber insulation, which starts at roughly £1,500 for a terraced house and may cost up to £4,000 for a detached home.

The Size of Your Loft

You could expect the roof insulation cost to be higher if the size of the loft is larger. While blanket insulation in a terraced house can cost between £150 and £200, the same material can cost up to £400 for the same treatment in a separate property.

While price is an important consideration, you should also consider what will be best for your house in the long run. If you want something more expensive, take into account the long-term value and the cost of needing to replace the insulation in a few years, wherever possible.

Ease of Access

Loft rooms may be quite difficult to access, which is partly why they are underutilised in our homes.

This aspect will also be taken into consideration by your builders. Your workers will have a difficult time navigating the space to fit the insulation if it is difficult for you to reach.

While spatial problems cannot be eliminated, you may prepare your workers for what to expect so that you are not hit with a high labour cost at the conclusion of the job because their expectations were not met by the space.

Thickness of roof insulation

According to the National Insulation Association (NIA), cellulose requires 220mm, rock wool 250mm, and glass wool 270mm. They continue to claim that a minimum of 270mm of loft insulation is necessary according to the current EEC program rules.

If you are unsure of the type of insulation you have, an expert installer will be able to clarify it for you and make sure you have enough to keep you warm.

How to reduce roof insulation cost?

One of the few house improvements that practically pays for itself after a few years of installation is loft insulation.

Your new insulation will typically start to reduce your energy expenditures after two years of installation, with results you’ll notice year after year.

Don’t skimp on the installation and make sure you select the optimum insulation for your space. With a forty-year projected lifespan, you want to install the loft insulation correctly the first time to prevent any alterations that aren’t necessary.

Making the location simpler to access or, at the very least, warning your traders that it might be difficult to get to will help ensure that they aren’t caught off guard when they come out to meet you to finish the work will help you save money.

Choosing the right roofer for the job

A smart solution if you’re sick of paying your energy bills and seeing the heat escape from your home via the roof is to buy some loft insulation. But it’s equally important that you choose the right roofing professional that can do a good job.

Here are a few things you can look for to choose the best roof insulation contractor.

  • Do some research on local professionals in different trades.
  • Make sure to confirm that your tradesperson has the training and expertise necessary to complete the work.
  • To make sure you get the greatest deal, request quotations from at least three different contractors.
  • Talk with your tradesperson about the different insulation techniques and materials they suggest for your project.
  • Never pay the entire sum up advance, and demand a detailed cost breakdown at all times.
  • If a deposit is necessary, make sure you have written documentation of all transactions, including the total cost.

Our roofers at SPS Roofing have plenty of experience and the necessary qualifications working on roof insulation projects. Do get in touch with us for a free estimate.

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SPS Roofing Ltd is a highly rated roofing company based in Exeter operating across Devon and South West England including Somerset, Cornwall, Wiltshire, Gloucestershire and Dorset.