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Whether working on a residential home renovation or enhancing a commercial space, Efficient Build Ltd delivers professional IWI installations tailored to each building’s needs.
HIGH-PERFORMANCE INSULATION

What Is Internal Wall Insulation?

Internal Wall Insulation involves installing high-performance insulation on the inside face of exterior walls, then finishing with plasterboard and plaster for a smooth, ready-to-decorate surface. Unlike external insulation, IWI doesn’t require scaffolding or disruption to the building’s façade, making it ideal for heritage or conservation areas.
Leading systems like those by Wetherby Wall Systems and SWIP provide flexible, high-efficiency solutions that improve thermal performance and long-term comfort.
WHAT ADVANTAGES ARE THERE?

Key Benefits of Internal Wall Insulation

Internal Wall Insulation offers many advantages for property owners:
Higher comfort and consistent indoor temperatures
Lower energy bills and reduced heat loss
No change to the building’s exterior — ideal for listed or conservation properties
Suitable for room-by-room installation during refurbishments
Can significantly improve the property’s energy efficiency rating (EPC)
Flexible systems that achieve excellent U-values without external works
By insulating from the inside, heat is retained within the living space and cold bridges are minimised, helping reduce drafty rooms and lowering long-term heating costs.
TRUSTED SYSTEMS

Industry-Approved Systems We Install

Efficient Build Ltd installs a range of trusted Internal Wall Insulation systems:

SWIP Internal Wall Insulation

A tested, certified system designed for solid masonry walls. It uses thermally engineered components that deliver excellent thermal performance and moisture control, and are adaptable for unique room shapes and features.

Wetherby InteriA Internal Wall Insulation

A fire-safe, moisture-open stone wool system offering superior thermal and acoustic performance while allowing walls to breathe — ideal for retrofit and refurbishment projects. Both systems are installed to manufacturer standards, ensuring performance, durability, and compliance with technical requirements.
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How It Works

Internal Wall Insulation is fitted directly to the interior walls using:
Thermally efficient insulation boards or engineered stud systems
Vapour control layers where required
Reinforcement and finishing plasterboard for a clean, smooth finish
This not only increases thermal resistance but also creates a continuous insulation layer that improves energy retention throughout the property.
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Residential & Commercial Applications

From traditional homes with solid walls to commercial refurbishments and flats, Internal Wall Insulation helps properties that can’t accommodate exterior insulation. It’s especially suited to:
Older or period properties
Listed or character homes
Flats and mid-terrace dwellings
Commercial buildings with aesthetic requirements
IWI delivers comfort, efficiency, and performance while maintaining the original look and character of the building.
COSTS & WHAT WE OFFER

Cost of Internal Wall Insulation

Costs vary depending on property type, size, insulation thickness, and finishing requirements, but Internal Wall Insulation is typically more cost-effective than external wall insulation due to reduced labour and no need for scaffolding. Many homeowners also qualify for government-backed funding schemes (such as ECO4) that can cover part or all of the cost of Internal Wall Insulation for eligible properties. Efficient Build Ltd provides clear, tailored quotations following detailed surveys, helping homeowners and businesses maximise efficiency and value.

Why Choose Efficient Build Ltd for Internal Wall Insulation?

Efficient Build Ltd offers:
Trusted installation of certified IWI systems
Proven thermal performance improvements
Professional finishes with minimal disruption
Residential and commercial project expertise
Comprehensive project management from survey to completion
Your property will benefit from increased comfort, reduced heating bills, and a long-lasting improvement in performance and appearance.
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Request Your Internal Wall Insulation Consultation

If you want to:
Make your home warmer and more efficient
Protect a property without changing its exterior
Improve comfort and reduce energy costs
Efficient Build Ltd can assess your needs and recommend the right solution. Contact us today to arrange a professional survey and receive your tailored quote.
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