Uninsulated buildings
Houses and apartment buildings built before the 1990s, with uninsulated walls: the gain is greatest.
Home/Real Estate/Is external insulation worth it
Guide · Energy efficiency
Is external wall insulation worth it? Pros, limits and bonuses.
External insulation is one of the most effective ways to cut consumption, but it is not always the right choice. Here is how to tell whether it pays off on your building.
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When it pays off
The cases where it pays most
Facade due for work anyway
If the facade needs repair or repainting anyway, adding insulation costs relatively less.
Mould in corners
Insulation raises interior wall temperatures and reduces condensation.
Very exposed houses
North-facing or very sunny walls: better comfort in winter and summer.
Before replacing the boiler
Insulating first allows a smaller, more efficient system.
With deductions active
In 2026 the Italian ecobonus is 50% for the main residence and 36% for other properties.
The limits
When to consider alternatives
In listed historic centres the facade often cannot be changed: you can insulate from inside with drywall linings. Where premium cladding or strong heat protection is needed, a ventilated facade is a more expensive but very durable alternative.
The result depends on installation: corners, sills, balconies and window junctions are the critical points. See how we work on the external wall insulation page.
FAQ
Frequently asked questions.
Does insulation also save in summer?
Yes, it reduces heat entering through the walls; with dense insulants such as wood fibre summer comfort improves further.
Does the apartment building need to approve it?
Yes, for shared facades a resolution of the owners’ meeting is required.
Does it pay off on your building?
Address and year of construction: we come to see and tell you.