Tag Archives: solid wall insulation

Do I need Planning Permission for Solid Wall Insulation?

Undertaking an EWI installation can be a difficult process. From finding the right installers, choosing the EWI system that suits you and your home, and accommodating the work on the house, there is a lot to think about. An extremely important factor to consider before you go ahead with EWI is whether or not you will need planning permission for it.

It’s always best to seek advice if you are unsure about this. To do this, you can call your local council and planning authority – it’s important to be one hundred percent certain before you go ahead with any projects, especially as in certain cases (i.e. for listed buildings) it can be a criminal offence with a penalty of two years in prison or an unlimited fine if you undertake a project such as EWI without consent.

Every EWI installation is different, and your EWI installer/surveyor will most likely know the ins and outs of the circumstances where you will need to get planning permission, but we thought we would give you a brief overview of when you are likely to require planning permission for a solid wall insulation installation.

Firstly, external wall insulation does not count as an extension or enlargement, and wall cladding is considered Permitted Development on the grounds that the new cladding will be similar in appearance to the existing cladding and structure. So, the new cladding does not have to be made of the exact same material as the older cladding, so long as it mimics the look of it!

One reason why an EWI installation may not be allowed would be if the EWI crossed over the boundary line and onto your neighbour’s property. Boundary lines can be a very contentious issue for some neighbours and it’s often really unclear as to where the boundary line actually is. In this instance, you may be able to negotiate with your neighbour whether they are happy with where the EWI will be installed. Also, bear in mind that if your external wall insulation is physically close to another property, to comply with building regulations it will need to be fire resistant to prevent fires spreading from building to building. (Our Rockwool insulation (link) is the best fire-retardant insulation material on the market).

In what instances do I need planning permission for solid wall insulation?

  • When it ‘overhangs’ land that is not considered to be in ownership of the property owner,
  • If the external cladding is of a different appearance to the current cladding/building appearance,
  • If you live in a listed building (you can check if your house is a listed building here https://historicengland.org.uk/listing/the-list/)
  • A flat or an apartment (usually these are lease-hold only, so any major changes will need to be approved by the freeholder)
  • a Conservation Area,
  • a National Park,
  • an area of Outstanding Natural Beauty,
  • or the Broads.

Outside of any of the above restricted areas, you may carry out your EWI installation without the need of planning permission! The good news is that it’s actually a small percentage of people who would need this permission. However, as we mentioned before, it’s always best to check with your local authority.

After getting planning permission for solid wall insulation

So you’ve sorted out your planning permission (whether it’s required or not) and you have the green light to go ahead with your EWI installation, what next? Well, your EWI installation does need to comply with building regulations. It is your installers responsibility to be able to certify this for you.

In brief, to comply with building regulations your EWI installation needs to have a damp proof course to resist moisture from the ground, and it must be totally watertight so as to endure the effects of the weather. The materials used also need to be fire resistant. This is all in the interest of health and safety, because a poorly installed EWI system can present the risk of falling off the wall and potentially causing injury. Materials which aren’t approved and without adequate fire resistance can also dramatically contribute to the spread of fire.

Our materials here at EWI Store are all BBA approved, which means that they are rigorously tested for any chemical or fire safety risks. We can also put you in touch with our approved installers who are all experienced in installing externally insulated render systems, and  have undertaken our specialist training course to ensure the safe and proper installation of our EWI system.

Are you looking for an EWI installer? Simply give us a call or an email and we would be delighted to put you through to one of our installers!

Calculating the cost of a external wall insulation system

Calculating the cost of solid wall insulation is not as simple as you may think. There are a huge number of components in a solid wall insulation system including adhesives, fixings, the insulation boards, as well as the finish required. Therefore, trying to calculate exactly how much materials cost takes some doing, especially when the different materials cover different areas – for example our reinforcement mesh comes in 50m rolls, while a bag of EWI-220 adhesive will cover 3m2 of wall.

Call us if you need help to calculate the cost of the External Wall Insulation Materials you require

At EWI Store, we are here to help, we have a great team who are on hand to help with any quote you may require. Simply give us a call with some rough measurements of the area that needs to be installed with our EWI systems and we can quickly calculate exactly what you need.

Use our EWI Calculator to calculate the External Wall Insulation materials you require

If you have some experience of solid wall insulation, you might want to use our EWI materials calculator.


We have designed this to be a very easy to use calculator to help calculate the correct materials needed for a solid wall insulation install.

Trade installers get fantastic prices and warranties on the system

So whether you are a householder looking to install solid wall insulation / new render façade on your home, a solid wall insulation installer looking for an easy to install product (at a great price) or an architect looking for a way to vastly improve the thermal efficiency of an old property, you have come to the right place.As an installer you may well be eligible to our trade discount prices too – so not only do you get a BBA approved system delivered directly to site, you also get the materials at a great price.  As a trade partner we are also able to offer system warranties provided the installers have been on our training course.

We also offer a huge range of brick slips!

We also now are delighted to say we have a huge range of brick slip finishes for those looking to recreate the brick feel of their property (i.e. don’t want to simply render a brick wall). These acrylic brick slips are not only incredibly realistic, they are also extremely robust, so despite being flexible and easy to install, they look the part and will last!

So there you have it – if you need some help calculating the material requirements for an EWI job, give us a call – our team are on hand to help!

EWI Store - insulated render systems for solid wall insulation

Want of free sample of the EWI Pro solid wall insulation system?

Before buying our solid wall insulation products you can give them a try for free.

Unfortunately our free samples aren’t going to be sufficient to insulate your home, but at least it should give you a feel for the product you are interested in buying!

We offer samples of our mineral and EPS insulation systems with either mineral render or the silicone silicate render.

Just enter your details below and we will send it out to you.

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