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Internal wall insulation being installed in a home
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Internal Wall Insulation

For solid walled properties that can't have cavity insulation, our internal wall insulation using our solid wall insulation system provides exceptional thermal performance with a 25 year guarantee.

25 Year
Guarantee
45%
Heat Saved
certified insulation
Certified
What is internal wall insulation?

The solution for solid walled homes

Internal Wall Insulation (IWI) involves fitting insulated boards to the inside surfaces of external walls. Using the solid wall insulation system, we create a thermal barrier that dramatically reduces heat loss in solid walled properties. Up to 45% of heat can escape through uninsulated solid walls.

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Diagram showing internal wall insulation build up, insulation backed plasterboard fixed to the existing solid wall
Internal wall insulation

What internal wall insulation does for your home

Internal wall insulation is fitted to the inside face of your external walls to cut heat loss and lift the energy performance of your home.

Rolls of insulation material ready for an internal wall insulation installation

Warmer in winter, cooler in summer

In some solid walled homes, close to half the heat lost escapes straight out through the walls. Insulating them is one of the most effective upgrades you can make.

A properly insulated wall holds warmth inside through winter and helps rooms stay cooler in summer, so your home is more comfortable all year round and costs less to run.

Built for solid walled properties

Internal wall insulation is the answer for properties with solid walls that have no cavity to fill. That includes homes built from brick, stone, steel frame or timber frame.

We fit a thermal layer to your existing internal walls and finish it with plasterboard. The result is better energy performance, steadier comfort, lower heating costs and fewer carbon emissions.

Installer fitting insulation panels to an internal wall
Insulation slabs fitted between timber studs on an internal wall

We leave the room finished, not stripped

Our work does not stop when the insulation is in. We plaster the walls, then refit skirting boards, architraves and windowsills so the room is left properly finished.

You get the thermal upgrade without being handed a decorating job to sort out afterwards.

Our solid wall insulation system

We install our solid wall insulation system, engineered specifically to upgrade existing solid and cavity external walls.

It pairs composite studs with insulation panels to deliver noticeably better thermal performance than a single layer approach.

Energy Giants team installing an internal wall insulation system
BBA certified products, guaranteed for 25 years

Every product we use in an internal wall insulation installation is BBA certified by the British Board of Agrement, and your installation is covered by a 25 year guarantee.

Our process

How internal wall insulation works

1

Free Home Survey & Assessment

We assess your solid walled property to determine the best IWI approach for each room.

2

Room Preparation & Protection

We carefully prepare each room, protecting furniture and flooring before work begins.

3

Insulation Boards Fitted

Certified insulation boards are precisely fitted to the internal surfaces of your external walls.

4

Plastering & Finishing

Walls are plastered and finished to a high standard, ready for decoration.

5

Quality Inspection & Certification

Every job is inspected for quality, and you receive full certification with your 25 year guarantee.

25 Year Guarantee
On all internal wall insulation installations
Our insulation services

Other ways to insulate your home

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Flat Roof Insulation

Proper insulation of flat roofs reduces energy loss and improves thermal comfort.

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Loft insulation material ready for installation

Loft Insulation

By properly insulating your loft, you will see dramatic savings in your heating bills and reduce heat loss.

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Cavity wall insulation being installed at a property

Cavity Wall Insulation

Installed by drilling a series of holes in the mortar joints of the external wall and filling the cavity.

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Room in roof loft conversion space

Room in Roof Insulation

Keeps a comfortable temperature by reducing heat loss and maximising energy efficiency.

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Under floor insulation beneath a suspended timber floor

Under Floor Insulation

Insulating beneath your floors cuts draughts and heat loss for a warmer ground floor.

Learn more →

Ready to insulate your solid walls?

Get a free, no obligation home survey and find out how we can help with your insulation.

Get a Free Quote Call 01200 407790
FAQs

Internal wall insulation questions, answered

What is internal wall insulation?

Internal wall insulation (IWI) involves fitting insulated boards to the inside surfaces of your external walls. It is the ideal solution for solid walled properties that cannot have cavity wall insulation, creating a thermal barrier that keeps heat inside your home.

What is our solid wall insulation system?

certified insulation stands for Solid Wall Insulation Product. It is a certified insulation system specifically designed for solid walled properties, providing exceptional thermal performance and a guaranteed standard of installation.

Will I lose much room space?

The insulation boards are relatively thin, typically reducing the room by only a few centimetres on each insulated wall. The energy savings and comfort improvements far outweigh the minimal space reduction.

How long does installation take?

Installation time depends on the number of rooms being insulated. Typically, a single room can be completed in 1 to 2 days, including board fitting, plastering, and finishing. Our team works efficiently to minimise disruption.

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