What is External Wall Insulation

External Wall Insulation

What is External Wall Insulation (EWI)?


If your house was built prior to the 1930s, the chances are that it will have solid walls. Insulating your solid walls  is a great way to make your home more energy efficient. The insulation will minimise heat loss in the winter, saving you money on your heating bills. It will also stop your home getting too warm in the summer, helping to keep your home at a more comfortable temperature.

According to research, twice as much heat could be lost through an un-insulated solid wall as through an un-insulated cavity wall. However, the great news is that solid walls can be insulated, both internally and externally.

How is EWI applied

For external wall insulation, you need to employ a professional.  The home can be insulated using an adhesive material which is fixed to the wall, then plastered over.  The finish applied to the external wall can be any combination of texturing, painting, tiling, brick slips, masonry work and/or cladding. A survey of your property will be carried out by RamEco prior to installation to ensure the product will work to its full potential and comply with all regulations. 

Planning permission and Building Control

As fully accredited professional installers of EWI, RamEco can self certify the insulation works which is required by law. Building regulations must be adhered to and in some instances Planning Permission. This is because this process involves covering the original brickwork and could significantly alter the current appearance of the property, impacting the character of the local area. Once any planning permission has been granted, the home can be insulated. RamEco will carry out all the checks for you so you can have peace of mind that your product not only complies with Building Regulations but also has full permission. 

Advantages of External Wall Insulation


  • Save up to £460 per year on your energy bills.
  • Increase the market value of your property.
  • Less disruption to the household than the alternative of Internal Wall Insulation, as the work is carried out outside
  • Renews your home’s external appearance and increases the lifetime of the brickwork.
  • Reduces penetrating damp and condensation issues such as black mould.
  • Complements other refurbishment work and aesthetically improves your homes appearance.
  • Reduces noise from outdoors with its soundproofing qualities.
  • An opportunity to fill cracks and holes in the brickwork, which will help reduce draughts

Guaranteed for 25 years

As Green Deal Approved installers, we  offer a 25 year Insurance Backed Warranty which is required by law for External Wall Insulation installations.  This gives our clients peace of mind that in the unlikely event your system should fail or if you were to sell your property, you will have all the necessary legal documents required for you EWI installation. 

ECO Funding Grants

ECO Grants are available for properties with Solid walls - no Cavity.

RamEco are able to claim the funding on your behalf if you qualify. Call us to find out if you qualify for ECO funding and let us calculate your entitlement. You might be pleasantly surprised how much you could save.

What is a Solid Wall?

Cavity or Solid Walls?

What is a solid wall?

External Wall Insulation is typically installed over Solid wall properties where cavities are not present, however, hard to treat cavities or unfilled cavities can also benefit from the system. You will need a survey to understand whether the system is suitable for your home. 

Why Insulation benefits

A typical solid wall will benefit from External Wall Insulation

Solid walls typically suffer from penetrating damp and also condensation issues. By insulating these walls, these issues can be illiminated and the properties temperature regulated. Warm in winter, Cool in summer!

A Typical solid wall

An un insulated solid wall

A solid wall property can have a number of appearances and can be difficult to recognise, so if you are unsure, book an appointment with our surveyor who will carries out non invasive checks to establish your wall construction.

Why Choose RamEco Ltd?

Years of Experience

External Wall Insulation in progress in Grimsby by RamEco Ltd

RamEco Ltd have insulated properties all over Lincolnshire, Humberside and Yorkshire. The team are professional and friendly and provide an outstanding service from start to finish.

Product Knowledge

External Wall Insulation helps lower heating bills

If you have a technical question, we know the answer! What ever you need to know about the system, U Values, or technical data, as approved product partners, we can answer your every question. 

We care about Conservation!

Thin coat render on a home in Grimsby

If your property has features, and your worried EWI wont look nice, talk to us about a solution. We can rebuild Tudor planks, corbels, quoin stones and many more traditional architectural features to preserve the look of your home.


This coat render installed in Louth Lincolnshire

Lots of beading and reinforced mesh went into this porch to replicate the original design. Crisp and beautiful nanopor silicone render top coat to finish!


External Wall Insulation with features to a home in Lincoln

An 1800's property in Lincoln. Banding, Quoin stones and Corbels molded from insulation to replicate the look of the property which was within a conservation area preventing thermal bridges.

More Features........

External Wall Insulation with Features in Grimsby

Mock Tudor replicated with External Wall Insulation and Silicone Render finish to preserve the original features of this 1930's property.