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Internal Wall Insulation

Internal Wall Insulation: Pros, Cons, and Installation Tips

Section detail of internal wall insulation featuring an existing solid wall with potential uneven surfaces or dampness, a minimum 30mm air gap, timber studs braced from floor to ceiling, mineral fibre insulation stapled to studwork, a vapor membrane, plasterboard with taped joints, skirting, and the existing floor.
Internal wall insulation section detail

If you're looking to improve the energy efficiency of your home and save on heating bills, internal wall insulation is worth considering. However, it's important to approach it with care, as poorly executed insulation can cause issues such as damp and condensation.

Internal wall insulation involves applying insulation to the interior face of external walls, usually in solid stone or brick homes built before the 20th century. This insulation method can be cheaper than external wall insulation, but it also reduces valuable floor space and can be disruptive during installation. So, it's important to make sure it's the best insulation solution for your home.

Room in the process of renovation featuring internal wall insulation with visible wooden stud frames and unfilled sections, construction tools scattered on the floor, and a bay window with natural light coming through.

An under-construction room with internal wall insulation installation in progress, showing exposed studwork and insulation materials, with tools and construction debris on the floor, and a bay window overlooking the exterior.


Type of installation

There are four main methods of installation, with building a new stud wall being the most common. However, it can be disruptive and require the removal and re-fixing of items such as switches, radiators, and kitchen units.

How much does it cost internal wall insulation?

The cost of internal wall insulation can range from £75to £145 per square meter, depending on the type of insulation and the condition of the existing wall. Up to 60% of the cost will be labor, so skimping on insulation thickness to reduce costs is not recommended.


Rockwool flexi insulation boards

Internal wall insulation can cause damp and condensation if not installed properly. A vapour control layer needs to be installed to prevent damp penetration, and cold bridges need to be covered with insulation to avoid the formation of condensation.

There are three basic methods of installing internal wall insulation, which involve checking the wall's condition, undertaking remedial work, and choosing the preferred installation method.

Renovated room with newly installed internal wall insulation, plasterboard in place ready for finishing, electrical wiring installations visible, and a large bay window allowing natural light, with renovation tools on the floor.

In summary, internal wall insulation can improve the thermal efficiency of your home and save on heating bills. However, it's important to approach it with care, as it can cause issues such as damp and condensation if not installed properly. By following the proper installation methods and addressing airtightness and heat loss, you can make the most of internal wall insulation and enjoy a more energy-efficient home.

If you're looking for a reliable contractor for your house extension, loft conversion, refurbishment, or renovation in London, be sure to check out the hashtags we've provided above. Don't hesitate to contact us if you have any questions or would like to discuss your project in more detail. We'd be happy to help you create your dream home


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