Installing external wall insulation (EWI) is a fantastic way to improve the energy efficiency and aesthetic appeal of a property, but one common query that homeowners have when trying to save money is whether it’s feasible to undertake this task independently. In this blog, we’ll be answering that question.

Understanding External Wall Insulation (EWI)

External wall insulation, often abbreviated as EWI, involves the application of insulating materials to the exterior walls of a building. This process aims to enhance thermal performance, reduce heat loss, and improve the overall energy efficiency of the property. Beyond its functional advantages, EWI can also significantly transform the appearance of a home, providing an opportunity for aesthetic enhancement.

Challenges of DIY Installation

While the idea of tackling a home improvement project independently may seem appealing, the reality of external wall insulation installation presents various challenges and is not a simple task. The procedures involved can be complex, requiring a thorough understanding of insulation materials, application techniques, and safety protocols. 


Ensuring the quality and longevity of the finished project necessitates the use of specialised tools and high-quality materials, which may be too expensive or not readily available to DIY enthusiasts. 

Professional Installation: Why It’s Preferred

In most cases, opting for professional installation of external wall insulation proves to be the superior choice. Experienced contractors possess the necessary expertise to execute the installation process efficiently and effectively. Reputable professionals often provide assurances of quality workmanship and may even offer guarantees, providing homeowners with peace of mind regarding the longevity and performance of their insulation system.


In most cases, even experienced DIYers will not be able to achieve the same quality finish as a professional, which at best won’t look as good, but could result in the work having to be redone by a professional anyway if the work has not been completed properly.

Planning Permission Considerations

It’s important to note that external wall insulation will alter the appearance of a property, particularly in cases where significant changes are made to the exterior facade. As such, obtaining planning permission from local authorities may be necessary in certain circumstances, such as for those living in listed areas. 


Factors such as the type of property, its location, and any relevant conservation regulations should be carefully considered to determine whether planning permission is required before commencing installation. Even if the work is permitted in these situations, the local authority will most likely insist that professional tradespeople carry out the work.

Cost Comparison: DIY vs Professional Installation

While DIY projects may initially appear more cost-effective, the expenses incurred for materials, tools, and potential rectification of errors can add up. Even if you can get hold of the same quality of materials and tools as a professional, you will likely have to pay more than they would, mitigating the savings you make. If you decide to cut corners with cheaper materials or installation techniques, the results will show this.


In contrast, professional installation offers a comprehensive service that includes expertise, labour, and warranties, often providing better long-term value for homeowners. While your upfront cost may be higher than going down the DIY route, the long-term savings will very quickly become apparent.

DIY vs Professional: Which Option Is Right for You?

The decision between DIY and professional installation hinges on various factors, including one’s level of expertise, available resources, and desired outcomes. While DIY projects may offer a sense of accomplishment for skilled individuals, the risks of improper installation and subpar results might outweigh any potential savings. 


Ultimately, homeowners should weigh the pros and cons carefully to determine the most suitable approach for their specific circumstances, but professional installation does offer numerous advantages, including superior workmanship, quality assurance, and peace of mind. By entrusting the task to experienced contractors, homeowners can ensure the effectiveness, durability, and aesthetic appeal of their insulation systems, ultimately enhancing the comfort and value of their properties.

If you are interested in having external wall insulation installed on your property, then please get in touch.