Thursday, June 20

Can I Insulate Cavity Walls Myself or Professional: Which is Better?

Keeping our homes warm during the chilly months while saving on energy bills is a common goal for many homeowners in the UK. One effective way to achieve this is by insulating cavity walls. But can you insulate cavity walls yourself, or is it a job best left to the professionals?

You might think of DIY either due to utilising your spare time in exciting activities or you have a lack of budget to pay for professional services. What if you are told to have a free insulation installed by a professional? Definitely, it will sound unbelievable. However, that’s not a prank. In fact, some UK homeowners are eligible for insulation grants under the ECO4 or GBIS scheme to insulate their homes. Here, all the work is done by government-approved professionals who meet all safety standards.

Let’s explore what cavity wall insulation involves, the pros and cons of DIY versus professional installation, and some essential tips to consider.

What Is Cavity Wall Insulation?

Cavity walls are external walls that consist of two layers of brick with a gap (or cavity) in between. This gap can be filled with insulating material to prevent heat from escaping, making your home warmer and more energy-efficient. The insulation process involves drilling small holes into the wall, injecting insulation material, and then sealing the holes.

Benefits of Cavity Wall Insulation

  1. Energy Savings: Properly insulated walls can reduce heat loss, leading to lower heating bills.
  2. Comfort: Your home will stay warmer in the winter and cooler in the summer.
  3. Environmental Impact: Using less energy reduces your carbon footprint.
  4. Property Value: Improved energy efficiency can increase your home’s value.

Can I Insulate Cavity Walls Myself?

Insulating cavity walls yourself might seem like a cost-effective option, but it’s a complex task that requires specialised equipment and skills. Here are some points to consider if you’re thinking about a DIY approach:

Equipment and Materials

You’ll need specific tools such as a masonry drill, a cavity wall insulation pump, and the insulation material itself. These items are not typically found in a standard DIY toolkit and can be expensive to purchase or rent.

Technical Knowledge

Understanding the structure of your walls and how to properly inject the insulation is crucial. Incorrect installation can lead to problems such as dampness, cold spots, or incomplete insulation coverage. It’s important to assess the condition of the cavity walls to ensure they are suitable for insulation. For instance, if there are any cracks or damp issues, they need to be addressed first.

Safety Concerns

Drilling into walls carries risks, such as hitting electrical wires or plumbing. A professional knows how to avoid these hazards. Moreover, working at heights can be dangerous if you don’t have the proper safety equipment and training.

Quality of Work

Professional installers have the experience to ensure the job is done correctly and efficiently. They also have access to high-quality materials and advanced techniques that might not be available to DIYers.

Why a Professional Is Recommended

Given the complexity and potential risks involved in insulating cavity walls, hiring a professional is generally recommended. Here’s why:

Expertise and Experience

Professionals have the training and experience to identify the best insulation materials for your specific walls and to install them correctly. They can assess your home’s suitability for cavity wall insulation, ensuring there are no underlying issues that could cause problems later.

Proper Equipment

Insulation professionals have access to specialised equipment and high-quality materials, ensuring the job is done efficiently and effectively. They also know how to use these tools safely and correctly.

Guarantees and Warranties

Most professional installers offer guarantees on their work. This means if anything goes wrong, they will come back and fix it at no extra cost. Some insulation manufacturers also provide warranties on their products when installed by certified professionals.

Time and Effort

Hiring a professional saves you time and effort. What might take you several days or even weeks to complete can often be done by a professional in just a few hours.

The Process of Professional Installation

When you hire a professional to insulate your cavity walls, here’s what you can expect:

  1. Assessment: The installer will assess your home to ensure it is suitable for cavity wall insulation. They will check for any existing dampness or structural issues that need to be resolved first.
  2. Preparation: The installer will prepare the walls by drilling small holes in the outer layer of brickwork.
  3. Injection: Insulation material is injected into the cavity through these holes using specialised equipment.
  4. Sealing: Once the cavity is filled, the holes are sealed with cement or another appropriate material.
  5. Inspection: A thorough inspection is conducted to ensure the insulation is evenly distributed and that there are no gaps or missed areas.


While the idea of insulating cavity walls yourself might seem appealing due to the potential cost savings, the complexity and risks involved make it a task best suited for professionals. A professional installer can ensure the job is done safely, efficiently, and to a high standard, giving you peace of mind and lasting benefits.

If you’re considering cavity wall insulation for your home in the UK, it’s worth investing in a professional service. Not only will you save time and avoid potential pitfalls, but you’ll also ensure your home is as energy-efficient and comfortable as possible. So, when it comes to insulating cavity walls, trust the experts to get it right.

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