What is EWI?

External Wall Insulation (EWI) is a layer of insulation fitted to the exterior of your property which helps prevent the heat inside escaping. This will almost always reduce your heating bills by making your home more fuel efficient.

Can I have it installed on my house?

Over 6.6 million homes in the UK, particularly those built before 1919, are solid wall constructions which means they won’t have an insulating gap. EWI is an ideal option for such solid wall properties but it is also suitable for a number of non-standard wall types. If you’re unsure about what type of construction your house is, we can carry out a free survey and let you know the options available.

What are the benefits of EWI?

There are a whole host of benefits that come with having EWI installed on your home. For most customers, the main selling points are the energy savings and the exterior makeover they get at the same time. However, there are many more benefits. EWI provides a new weatherproofing layer to your home, increasing the building’s lifespan. It will also reduce condensation on the internal walls, helping to prevent damp. Unlike internal wall insulation, EWI won’t reduce the amount of useable floor space inside your home and you can continue to live in the property whilst installation is taking place. You’ll also be doing your bit for the environment by reducing the need to flick the heating switch on in the colder months.

How much does it cost to have EWI installed?

The costs will come down to a number of variables, including the size of your house and the type of system and finish you choose to have. On average, the cost of a installing EWI to a semi-detached home will range from £7,000-£10,000.

As well as looking at costs, homeowners should look at the savings they will make following installation. First, there is the proven reduction in energy use which will be immediately noticeable through reduced bills. Then there is the reduced maintenance burden from improved weather proofing. The aesthetic, insulating and protective properties of EWI will ultimately be an investment and add value to your home.

How much money could I save?

This will vary from house to house, depending on the level of insulation previously in place. For the most vulnerable homes, it is reported that as much as 45% of the heat inside is lost through the external ceilings and walls. The Energy Saving Trust has estimated that heating costs could be reduced by up to 40% by installing EWI.

Can I get funding to have my house insulated?

It is sometimes possible to obtain grants from energy suppliers and/or Local Authorities as part of government energy efficiency incentives . For more information on what funding might be available, visit the Energy Saving Trust

Is EWI safe?

In the wake of the Grenfell disaster, the role of external wall coverings in construction has been closely scrutinised – and rightly so. Our industry experts at MPC are here to guide you through the most suitable form of EWI for your project and will explain all about the safety features within the systems to give you peace of mind.

Is it easy to look after?

One of the reasons EWI is such a popular option is because of its low maintenance properties. By following a few simple guidelines, you can ensure your system looks as good as new for many years to come.

Do I need planning permission?

Most of the time, no planning permission will be required for the installation of EWI although there are some exceptions (e.g. if it will change the appearance of the facade or you are in a conservation area). It’s always best to check with your local planning office ahead of time to make sure.

How long does EWI last?

MPC are approved installers with a number of system manufacturers and we choose to use only the best on the market. Having EWI installed with an approved installer means that on completion of works, you will be provided with a 10-25 year insurance-backed guarantee (the actual length is dependant on the supplier). You can rest assured that should anything happen during that period we will return to your property and fix the problem with no quibble (subject to Terms and Conditions).

How is EWI installed? How long does it take to install?

On a normal home, EWI will be installed in three layers: the insulation itself, a bonding mesh coat and a final weatherproofing layer to give your home its finished look. An installation will typically take just two to four weeks, depending on the type of system being installed. Weather will also play a significant role in the process and prolonged spells of wet weather may slow things down. We generally recommend carrying out installations in the spring and summer months to reduce the risk of long gaps.

What will my house look like when it’s finished?

One of the things our customers love most about EWI is how much it improves the look of their home and with a variety of finishing options available, it’s a great opportunity to create the home you’ve always wanted. We can provide anything from a simple coloured render finish to a pebble dash or brick effect. We’ll guide you through these available options during your survey.

Will I need other work doing?

As you are effectively increasing the thickness of the external wall, it is likely we will need to carry out some enabling work. This might include extending waste water pipes and any wall-mounted service brackets. Don’t worry though, this will all be included in the installation package from MPC so you won’t need to get someone else in. Some customers also find that EWI installation provides a good opportunity to replace old guttering, fascias and soffits and render garages or garden walls to match. If this is something you’re interested in, just let our surveyor know and we’ll provide you with a quote for any extras.

Is there any preparation I’ll need to do?

Whilst MPC will do all we can to minimise the disruption to your neighbours, it’s sometimes necessary to place scaffold poles within their boundary. In this case, we would ask you to notify your neighbour and seek their permission. Our scaffolders will always make safety a priority and will never block any access to a building’s windows or door. Your neighbours are welcome to get in touch with us if they have any questions or concerns.
We would also ask you to make sure anything in front of the walls, such as garden furniture or plant pots, is moved out of the way to ensure a clear, safe working space. If you’re not sure about anything, just let us know.

Is there a downside to EWI?

It’s important to remember that EWI is considered major refurbishment works and, as with all construction projects, there are some important things to consider. For a start, you should check with your local planning office before beginning any work to see if you require planning permission.

Good access to the property and all external walls is vital so you may need to cut down any trees or move any obstacles before we arrive.

The good news is that most other issues will be picked up by MPC, either before or during the works, and, as the EWI specialists, we will know what to look for and how to fix it.

Overall, we’re sure you’ll agree that the benefits far outweigh these challenges.