Internal Wall Insulation

SWarmer Homes. Lower Bills. Smart Internal Upgrade.

Internal Wall Insulation (IWI) is an effective way to improve the energy efficiency and comfort of homes where external wall insulation is not suitable or not preferred.

At EcoGlow Group Ltd, we deliver high-quality internal wall insulation solutions designed to reduce heat loss, improve comfort and enhance overall energy performance.

Whether you live in a property where the external appearance must remain unchanged, or you want a targeted insulation upgrade, IWI can be a practical and efficient solution.

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01932 550828

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What Is Internal Wall Insulation?

Internal Wall Insulation is installed on the inside of external walls. Insulated boards or stud systems are fitted to the internal surface, then finished with plasterboard and decoration.

This creates a thermal barrier that helps retain heat within the home, improving comfort and reducing energy use.

IWI is commonly used in properties where external wall insulation is not possible, such as flats, heritage buildings or homes in conservation areas.

Before and After: The Difference IWI Can Make Before IWI

Homes without sufficient wall insulation often experience:

Heat escaping through walls
Cold internal wall surfaces
Higher heating bills
Draughts and uneven temperatures
Condensation on walls
Rooms that are difficult to keep warm
After IWI

With internal wall insulation installed, you can benefit from:

Improved heat retention
Lower energy usage and heating costs
Warmer rooms and improved comfort
Reduced cold spots
Reduced risk of condensation on internal surfaces
Better temperature consistency
Improved energy efficiency rating

While IWI does not change the external appearance, it significantly improves how your home feels internally.

Key Benefits of Internal Wall Insulation

1. Reduce Heat Loss

IWI adds an insulating layer to internal walls, helping to reduce heat escaping through the building fabric.

2. Lower Energy Bills

By improving thermal performance, your heating system requires less energy to maintain a comfortable temperature.

3. Improve Comfort

Rooms feel warmer and more stable in temperature, especially during colder months.

4. Suitable for Properties Where External Changes Are Limited

IWI is ideal for properties where external wall insulation cannot be installed due to planning restrictions or aesthetic requirements.

5. Flexible Installation

Internal wall insulation can be installed room by room if needed, allowing for phased upgrades.

6. Improve Energy Efficiency

Adding internal insulation can improve your home’s energy performance rating and overall efficiency.

7. Reduce Condensation Risk

Warmer internal wall surfaces can help reduce condensation, provided ventilation is properly managed.

How Internal Wall Insulation Is Installed

The installation method depends on the property and system chosen, but typically follows these steps:

Step 1: Survey and Assessment

We assess wall condition, moisture levels, ventilation, room layouts and any constraints that may affect installation.

Step 2: Preparation Works

Preparation may include:

Removing existing finishes if required
Repairing wall defects
Addressing damp issues
Preparing surfaces for installation

Step 3: Installing Insulation System

There are two common approaches:

Insulated plasterboard fixed directly to the wall
Stud framework filled with insulation and finished with plasterboard
The correct system is selected based on wall condition, space availability and performance requirements.

Step 4: Sealing and Finishing

Joints are sealed, and the wall is finished with plaster, ready for decoration.

Step 5: Final Checks

We ensure all work is completed to a high standard and that insulation continuity and detailing are correct.

How Long Does Internal Wall Insulation Take?

Installation time depends on the size of the property and number of rooms involved.

Typical timescales:

Single room: 2 to 4 days
Small property: 1 to 2 weeks
Larger property: 2 to 4 weeks

Timescales can vary depending on preparation works, drying times, and complexity.

Is Internal Wall Insulation Right for Your Home?

IWI may be suitable if:

External wall insulation is not possible
You want to retain the original external appearance
You are improving specific rooms or areas
Your home has solid walls
You experience cold walls or high heating bills

EcoGlow will assess your property to determine the most appropriate solution.

Things to Consider Before Installing IWI

Internal wall insulation requires careful planning:

Some internal floor space will be reduced
Radiators, sockets and fittings may need to be moved
Rooms may need redecorating after installation
Proper ventilation is important to prevent moisture issues
Existing damp problems must be resolved before installation

We guide you through all considerations during the survey stage.

Frequently Asked Questions

What is internal wall insulation?

It is insulation applied to the inside of external walls to reduce heat loss and improve comfort.

Will IWI reduce my energy bills?

Yes, it can significantly reduce heat loss, leading to lower energy usage depending on the property.

Will I lose space in my rooms?

Yes, a small amount of internal space is lost due to the thickness of insulation and plasterboard.

Is the work disruptive?

There is more internal disruption compared to external insulation, as work is carried out inside rooms.

Can I install it room by room?

Yes, internal wall insulation can be installed in stages if required.

Does it help with condensation?

Yes, by warming wall surfaces, it can reduce condensation risk, provided ventilation is adequate.

Do I need planning permission?

Usually not, as the work is internal, but it is best to confirm for listed buildings or special cases.

How long does it last?

When installed correctly, internal wall insulation can last for many years with minimal maintenance.

Why Choose EcoGlow

EcoGlow Group Ltd provides professional insulation and retrofit solutions designed to improve comfort, efficiency and long-term performance.

With experience across insulation, heating and whole-house upgrades, we ensure internal wall insulation is installed correctly and integrated with your home’s overall performance

When you choose EcoGlow, you get: