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Roof and attic
Do you use your attic for storage, as a bedroom or as an office? Then the roof itself is insulated from the inside, under the rafters. €100 to €160 per m² of roof, VAT, finish and painting included, in 1 to 3 weeks.
By David Francisco, civil engineer at EnergyEase · Published 19 October 2026
Free and without obligation
Get a quote for your roof
We look at the attic and the roof from the inside, measure and send a written quote with the final price, usually within 48 h.
Rather talk? 210 270 937 or WhatsApp
We use your details only to plan the visit and send your quote.
5.0 on Google
from 54 reviews
Free technical visit
we check the roof from inside
Published prices
per m², VAT included
Written quote
usually within 48 h
The first question
It depends on how you use the attic. This is also what ADENE, the Portuguese energy agency, recommends: if you use the attic, insulate the roof; if you do not use it, insulating the floor is enough.
The attic is used
€100–160/m² VAT incl.
The attic becomes part of the home: less cold in winter and less heat in summer.
The attic is not used
€25–45/m² VAT incl.
Cheaper and quicker. The attic stays cold, but the home below is protected.
Attic insulation →The roof price is per m² of sloping roof, which has a larger area than the floor. Recommendation from ADENE, “Isolamento de Coberturas” guide (in Portuguese). Prices include VAT; the final amount is the one in the written quote, after the visit.
How we insulate
The tiles stay in place. We only work inside, under the rafters, and the attic gets a new ceiling, ready to use.
Will the attic be a bedroom or an office? We add a vapour control layer behind the board. And we keep air flowing under the tiles: that is what prevents condensation.
Materials
All of them insulate well at the right thickness. The choice depends on your headroom, budget and fire rating. We choose with you at the visit.
| Material | Insulates (λ: lower is better) | Fire rating | Good to know |
|---|---|---|---|
| Mineral wool | 0.034–0.044 W/(m·K) | A1 non-combustible | The most common. Needs more thickness than PIR for the same result. |
| XPS | 0.034–0.036 W/(m·K) | E kept behind the board | Rigid boards that do not take up water. Always behind the plasterboard. |
| PIR (foil-faced) | 0.022 W/(m·K) | E kept behind the board | The thinnest for the same insulation. Good when headroom is tight. |
| Cork (ICB) | 0.039–0.040 W/(m·K) | E kept behind the board | Natural and Portuguese, but more expensive. On request. |
The lower the λ, the less thickness you need. Values from the technical data sheets of Knauf Insulation, Isover, weber, Onduline and Amorim. ADENE recommends class A1 materials.
Price and timing
Price per m² of roof
€100–160
VAT included
Example: 40 m² of roof
€4,000–6,400
VAT included, final amount in the written quote
Duration of the work
1 to 3 weeks
depending on area and access
Get my free quoteRoof insulation from the inside costs €100 to €160 per m² of roof, VAT included, with finish and painting. It is measured on the sloping roof, not on the floor.
The price depends mainly on the material and thickness, access to the attic and the shape of the roof: a roof with many angles takes longer. On a small area the price per m² is a little higher.
Included in the price
Not included
At the free visit we look at the attic and the roof from the inside, measure and tell you what makes sense: insulating the roof or the floor. The written quote usually arrives within 48 hours.
How it works
Today
Request
Fill in the form or call us. We book the visit.
Free
Technical visit
We check the roof from inside: the rafters, the underlay, signs of water and the headroom.
Usually within 48 h
Written quote
With the material, thickness, price including VAT and timing.
When you decide
The work
1 to 3 weeks, depending on the area. At the end we clean up and check everything with you.
“I was very satisfied with the work. The team insulated the walls and the roof of part of the bedroom, with great care and professionalism.
Besides the quality of the work, I would also like to highlight the excellent finishes: the holes made in the ceiling were completely concealed and the walls were repaired and painted with great care.
The improvement in the bedroom's thermal comfort was very significant. I recommend them without hesitation.”Tomás M. · Google, translated from Portuguese
“Very professional and friendly guys. They tackled a completely non-insulated top-floor apartment, loft space for me. It was fairly reasonably priced and only took a day to complete. The team laid a single 5mm reflective sheet which was covered by a 100mm thick, rock-wool slab across the whole floor area of our roof space. It has made a big difference to internal temperatures during cold spells and I hope it may help in the summer months as well. I would recommend if you are an immigrant from northern Europe who feels the cold here during the Portuguese winters and to anyone that prefers a much cosier home.”
LM W. · Google
“I am very satisfied with their work. They insulated my attic with rock wool and were efficient, professional and friendly. I recommend them!”
Renato C. · Google, translated from Portuguese
Questions
Another question? Call 210 270 937 or message us on WhatsApp.
If you do not use the attic, insulate the floor: it is cheaper (€25 to €45/m², VAT included) and quicker. If you use the attic for storage, as a bedroom or as an office, insulate the roof from the inside, under the rafters: €100 to €160 per m² of roof. This is also what ADENE recommends.
Between €100 and €160 per m² of roof, VAT included. An attic with 40 m² of roof comes to €4,000 to €6,400. The price depends on the material, thickness, access and the shape of the roof. The final amount is the one in the written quote, after the free visit.
Usually 1 to 3 weeks, depending on the area, access to the attic and the angles of the roof.
Not yet. The leak has to be fixed first by a roofing specialist: insulating over it hides the problem and ruins the insulation. We do not do roof repairs or waterproofing. Once it is repaired, we insulate. This is also what ADENE recommends in its “Isolamento de Coberturas” guide (in Portuguese).
In most cases, yes. Air must keep flowing between the tiles and the insulation, and no water can get in. At the visit we look at your roof and tell you whether it is possible.
Not if it is done right. We keep air flowing between the tiles and the membrane, which is breathable, and in a lived-in attic we add a vapour control layer on the inside, with taped joints. Airing the attic every day still helps.
A few centimetres: the insulation, frame and plasterboard sit under the rafters. How much depends on the material: PIR is the thinnest for the same insulation. At the visit we measure the headroom and show you how much you lose.
It depends on the material. For a renovated roof, the Portuguese thermal regulation (REH) sets a maximum U-value of 0.40 W/(m².°C) in climate zone I1, which covers most of Greater Lisbon. At the visit we choose the material and thickness to get there, based on your headroom. Source: Portaria 138-I/2021 (in Portuguese).
As a rule, no: interior works that do not change the façade, the outside of the roof or the structure are exempt from a permit under Portuguese planning law (RJUE, article 6). If the building is listed, part of a condominium, or if you are converting the attic into living space, check with the câmara municipal.
Yes. The roof is the part of the home that heats up most in the sun. With insulation underneath, much less heat reaches the attic and the rooms below.
Keep reading
Attic insulation
Insulating the attic floor: rolls or blown-in wool.
Read more →
False ceilings and blown-in insulation
Mineral wool above an existing false ceiling.
Read more →
Insulation prices
Price per m² for each technique, VAT included.
Read more →
Cold and damp homes
Where the damp comes from and what actually helps.
Read more →
Visits in Lisbon, Cascais, Oeiras, Sintra, Almada and Setúbal
Free visit, quote usually within 48 hours
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