External wall insulation, known in Portugal as capoto, roof insulation and sound insulation are quoted free, in English or Portuguese. Say what you want from the house, cooler in August, warmer in January or quieter at night, send photos of the walls, the windows and the roof, and the quote comes before anything is ordered.
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Handyman Algarve quotes insulation work in the Algarve for free in 2026: external wall insulation (ETICS, known in Portugal as capoto), roof insulation over a ceiling or in a flat roof, and sound insulation against a neighbour. As of 2026 no Portuguese energy regulation fixes a thickness for external wall insulation: Portaria n.º 138-I/2021 sets a maximum U-value for walls and roofs that are new or renovated, and the thickness is what the chosen insulant needs to reach it. Describe the house, send photos, and the quote comes in English or Portuguese before any work starts.
External wall insulation wraps the outside of a house in a continuous insulating layer and gives it a new render. The system is called ETICS, short for External Thermal Insulation Composite System, and in Portugal it is known as capoto. It is built up in layers: insulation boards bonded to the existing wall, and mechanically fixed where the system and the wall call for it; a base coat with a reinforcing mesh embedded in it; and a finishing render or coating. The boards can be expanded polystyrene (EPS), mineral wool or cork, among others.
It is assessed as a kit rather than as loose parts. A CE-marked ETICS has a European Technical Assessment (ETA) stating its thermal resistance for each insulant thickness assessed, and the application follows the project, where there is one, and the manufacturer's instructions. Because the layer runs unbroken over the wall, the Manual SCE, the manual energy certificates are calculated by (Despacho n.º 6476-H/2021), names "isolamento térmico contínuo pelo exterior", continuous external thermal insulation, as a construction that avoids or minimises flat thermal bridges: the concrete columns, beams and slab edges in a wall that let heat through faster than the masonry around them.
As of 2026, no Portuguese energy regulation fixes a thickness for external wall insulation. For walls and roofs that are new or being renovated, Portugal's building energy rules (Portaria n.º 138-I/2021) set a maximum thermal transmittance: 0.50, 0.40 or 0.35 W/(m².°C) for an exterior wall and 0.40, 0.35 or 0.30 for a roof, in winter climate zones I1, I2 and I3. They are national values that bind an element being built or renovated, not a wall left as it is, and components that only undergo conservation works are excluded. A building's zone follows its region and its own altitude, and the technician who signs the project or the energy certificate states it.
The thickness is then what the chosen insulant needs to reach that value, which depends on its conductivity, so the same target means different thicknesses with EPS, mineral wool or cork. Where the job has a project, the thickness is set there. Where the works are renovation works exempt from prior control, Decreto-Lei n.º 101-D/2020 (article 5.º n.º 3, as amended by Decreto-Lei n.º 102/2021) puts it on the contractor, the empreiteiro, to ensure the requirements are met on the basis of technical documentation characterising the solution.
Capoto is one of several ways to insulate a wall. Two others leave the facade as it is: a lining of insulation and board fixed to the inner face of the external walls, or, where a double wall has an empty cavity between its two leaves, insulation blown or injected into that cavity. They compare like this.
| External (ETICS or capoto) | Internal lining | Cavity fill | |
|---|---|---|---|
| Thermal bridges | Covered: the layer runs over columns, beams and slab edges | Remain where floors and inner walls meet the outer wall | Remain at columns, beams and wherever the cavity is interrupted |
| Room lost inside | None | Some, from every wall that is lined | None |
| Disruption while living in the house | Work outside from scaffold; the rooms stay in use | Room by room: furniture, skirting and anything fixed to those walls comes off and goes back | Small: drilling and injecting, then filling the holes |
| The facade finish | A new render or coating, with the colour chosen again | Unchanged | Unchanged, apart from the filled holes |
| When it suits | A house whose outside can change, above all where the render needs redoing anyway | A flat, a facade that cannot change, or one room at a time | A double wall with an empty, dry cavity |
For a house whose outside can be changed, it is the most complete of the three: one continuous layer over the wall and its frame, nothing taken from the rooms, and the work done from outside while the house stays lived in. It is not a damp treatment, and over a wall that is wet it hides the problem rather than solving it. When it pays in a particular house, and when it does not, is set out in the guide to whether external wall insulation is a good idea.
In the Algarve the case is about summer as much as winter. Read against the Manual SCE's own criteria (Despacho n.º 6476-H/2021, Tabelas 8 and 10), the Algarve's reference values put every building in the region in summer zone V3, the band for a mean outdoor temperature above 22 °C over the cooling season, at every altitude, and for that season the same reference values give a wall facing east or west 515 kWh/m² of accumulated solar energy, against 405 for a wall facing south. An insulated wall slows that heat on its way in.
The weak points are the details, not the flat field of boards, and each one has a mechanism that a careful installation deals with:
There are two kinds of roof to insulate, and they are different jobs. A pitched tiled roof with a roof space, the desvão or sótão, is insulated either on the ceiling below it, which leaves the roof space cold and ventilated, or between and under the rafters, which brings the roof space inside the insulated envelope when it is used as a room. A flat roof or roof terrace has no space to fill: its insulation layer is laid with the waterproofing, above or below the membrane depending on the system, and it belongs with that job. Opening a terrace to insulate it is the moment to redo its flat roof and terrace waterproofing, and the other way round.
Working in a roof space is safe when it is done in the right order. Light it and ventilate it first, and handle mineral wool with gloves, long sleeves and a dust mask. Walk only on boards laid across the joists, never on the ceiling between them, which is not made to take a foot. Before anything is laid, look at what is already there: recessed downlights and old cables are not buried under insulation, because heat builds up at a fitting not rated to be covered, and a covered cable cannot shed its heat, which lowers the current it can safely carry. That part goes to an Algarve electrician before the insulation goes down.
Work from outside, on the tiles, is work at height and needs scaffold or edge protection rather than a ladder alone. An old roof can also hide corrugated fibre-cement sheets, fibrocimento, under the tiles or on an outbuilding, and older ones can contain asbestos. They are not cut, drilled, broken or stood on by a DIYer: damaging them can release fibres, an old sheet can give way under a person's weight, and removing them is specialist work. The step by step for a roof that has never been insulated is in how to insulate an old roof.
Noise is a different problem from heat, and a thermal layer on the outside of a house does little for noise from next door, because that sound travels through the shared wall and along the floors between the two homes. Sound is stopped by three things working together: mass, which a heavy layer provides; separation, so the new layer does not touch the wall that is vibrating; and airtightness, because sound passes through any gap that air can. Soft insulation in the cavity of a lining absorbs what gets into it.
Build an independent lining in front of it: a separate frame that stands off the shared wall without touching it, filled with mineral wool and faced with two layers of dense plasterboard with staggered joints. Seal the perimeter with an acoustic sealant, because an open edge lets sound around the lining. Some noise will still travel through the floor and the ceiling, so the result is a reduction rather than silence. Plasterboard linings and partitions are drywall and plastering work, and they are quoted with it.
Floors are two problems. Footsteps and dropped objects are impact noise, which a resilient layer under a floating floor finish deals with at the source, in the room above. Voices and television from below are airborne noise, which a ceiling hung on resilient fixings, with insulation above it, reduces.
Not from the Fundo Ambiental, as at September 2026: it has no open application window for insulation, windows, heat pumps or solar in a private home. The Programa de Apoio a Edifícios mais Sustentáveis, known as Edifícios+, last opened to private homeowners between 18 July and 31 October 2023 and has been closed since; its typology 2 was the application or replacement of thermal insulation in roofs, walls or floors. Vale Eficiência is a different instrument, a means-tested voucher for households in energy poverty rather than a general renovation grant, and applications by beneficiaries closed on 31 October 2024. Source: Fundo Ambiental, notices 05/C13-i01/2023 and 06/C13-i01/2023, read in September 2026. National scope.
What exists for 2026 is a loan rather than a grant. Portaria n.º 442-A/2025/1 of 12 December created a reimbursable credit instrument for home energy-efficiency measures, managed by Banco Português de Fomento with technical collaboration from the Agência para o Clima, to be made available within a year of publication. Its list of measures includes thermal insulation of roofs, walls and floors. As at September 2026 no rates, no ceilings and no application window had been published. Applicants in the first four income brackets need no prior energy certificate; every other individual applicant has to hold one already, of class C or lower. For every applicant, a prior certificate of class B or higher makes the property ineligible, and every property financed is certified again after the works. Anyone who tells you the Fundo Ambiental will pay towards a capoto is describing a programme that, as at September 2026, is not open.
The RJUE, Portugal's national planning and building regime, does not name external wall insulation, ETICS or capoto anywhere. Three of its provisions decide where an insulation job sits. Article 2.º f) defines obras de conservação as works that keep a building in the condition it was in at the date of its construction, reconstruction, extension or alteration, expressly including restoration, repair and cleaning, and article 6.º n.º 1 a) exempts them from a licence (licença) and from a comunicação prévia. Article 2.º d), in the wording in force since 1 October 2026, defines obras de alteração as works that change the physical or aesthetic characteristics of an existing building or flat, naming among its examples the nature and colour of the exterior cladding materials, without increasing its total construction area, its footprint, the height of its facade, or its height or volume. And article 6.º-A n.º 1 h) treats the replacement of exterior cladding, roof or tile-roof covering materials as a work of minor urban relevance, exempt from a licence and from a comunicação prévia, where the replacement gives an exterior finish identical to the original and improves energy efficiency: two conditions that apply together.
External wall insulation thickens the wall and gives it a new render or coating. Neither the national text nor the municipal regulations of Albufeira, Loulé and Lagos names it, and none of them says whether a thicker wall with a new render meets the identical-finish condition. Changing the finish of a facade falls within the article 2.º d) definition of an obra de alteração. Among the routes the RJUE in force since 1 October 2026 sets for such works are a comunicação prévia, for works in an area covered by a plano de pormenor, a unidade de execução or an operação de loteamento that defines the parameters article 4.º n.º 4 d) lists, or in a zona urbana consolidada within the limits of article 4.º n.º 4 e), and a licence, for works of construction, alteration or extension not subject to comunicação prévia under n.º 4 d) (article 4.º n.º 2 c)); works on classified property have their own alínea (article 4.º n.º 2 d)). Which route applies to a particular house is for your câmara or the responsible technician to decide, not for this page, so nobody can honestly promise you that capoto needs no paperwork.
Article 6.º-A n.º 1 h) is cited here in the wording in force since 1 October 2026, in the RJUE as republished by Decreto-Lei n.º 108/2026, and it carries exactly the same words as the wording in force before that date. The rules for the start of works changed on that date. The RJUE's start-of-works information reaches the câmara municipal at least five days before work starts and names whoever will carry out the work; since 1 October 2026 it expressly includes works exempt from a licence or a comunicação prévia, and since the same date the owner or the works director also posts a notice at the site, visible from the public road, at least five days before work starts (article 80.º-A n.os 1 and 5, in the wording republished by Decreto-Lei n.º 108/2026). Portaria n.º 320/2026/1 of 31 July 2026, in force since 1 October 2026, approves the national form for that information and revised site-notice models. Before that date, Silves and Loulé already required exempt works to be notified to the câmara locally, at least five days ahead. Conservation work carried out entirely inside a building or flat is exempt from that information (article 80.º-A n.º 3), which does not help a facade.
Two limits always travel with the exemptions. One is national: none of the list of works of minor urban relevance applies to works on buildings that are classified or being classified, of national, public or municipal interest, on buildings in the protection zone of one, save for the window-frame item (article 6.º-A n.º 1 j)), or on buildings within an ensemble or site that is classified or being classified (article 6.º-A n.º 2, in the wording in force since 1 October 2026; until 30 September 2026 the first exclusion named national or public interest only), and the conservation exemption applies without prejudice to article 4.º n.º 2 d), the alínea for works on classified property, and to special legislation (article 6.º n.º 1). The other is local: a município may set stricter rules than the national ones. Loulé shows the second limit at work on exactly this job: article 84.º of its municipal regulation (Regulamento n.º 884/2024) subjects the materials applied to the exterior cladding of buildings to specific appraisal by the câmara's services and reserves the câmara's right to indicate other materials or colours. Your own câmara is the authority on which side of the line your job falls.
As of 2026, external wall insulation is quoted per square metre of wall, and the rate is built from lines that differ from one house to the next. Area and access come first: how much wall, how high, and whether it needs scaffold all the way round or a platform on one side. Then the state of the existing wall and its preparation, from washing and removing loose render to treating cracks. Then the insulation board and its thickness, chosen for the U-value the renovated wall is designed to reach.
The detailing at windows, sills, the base and the roof junction comes next, and it is where the hours go on a house with many openings. Then the render and the finish. Any câmara paperwork, where the câmara requires it, is a line of its own.
Roof insulation is priced by area and access in the same way, with the roof space or the terrace deciding which kind of job it is, and sound insulation by the wall or floor area and the build-up chosen. A rate borrowed from another house misleads, because these lines are what set it. What makes a quote accurate is a set of photos: each facade from the garden, the windows close up, the base of the wall, the parapet from the ground or a terrace, and the roof space by torchlight. See how it works for the process from request to finished job.
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For a house whose outside can be changed, yes: it puts a continuous layer over the wall and its columns and beams without taking space from the rooms, and the work is done from outside while the house stays lived in. It is a poor idea over a wall that is damp, because insulation hides a damp problem rather than curing it. What decides whether it lasts is the detailing at windows, sills, the base of the wall and the roof junction.
The problems come from the details rather than the boards. Water gets behind the render at an unsealed window reveal, at a sill that does not project past the new wall face, through a crack in the base coat, or at the top of a parapet left without a capping. At ground level a thin render dents where it can be knocked, and the lowest boards sit in the splash zone. Insulating over a damp wall hides the damp instead of curing it.
The best one is a complete system that suits the wall, rather than a single board that wins everywhere. External wall insulation, or ETICS, is sold as a kit of boards, adhesive, mesh and render, and a CE-marked system has a European Technical Assessment stating its thermal resistance at each insulant thickness assessed. EPS is light and easy to shape, mineral wool does not burn and lets vapour through, and cork is a natural board. Mixing components from different systems leaves a wall outside the assessment of any one system.
It depends on the roof. Over the ceiling of a pitched roof whose roof space is not used, mineral wool rolls laid between and across the joists are the simple answer. Where the roof space is lived in, rigid boards or batts go between or under the rafters, with ventilation kept above them where the roof needs it. On a flat roof or terrace the boards are laid with the waterproofing as one job, and above the membrane they must tolerate water, as extruded polystyrene does.
It depends on what sits directly under the tiles. With no underlay, or an underlay that does not breathe, keep a ventilated gap between the insulation and the tiles so moisture can escape instead of condensing in the insulation. With a breathable membrane made to be in contact with insulation, follow the instructions of its maker. Where the insulation lies on the ceiling of an unused roof space, the roof space itself is the gap, and its ventilation at the eaves should never be blocked.
External wall insulation is priced per square metre of wall, and the house sets the rate as much as the board does. Scaffold and access, the state of the existing render and its preparation, the insulant and the thickness chosen for the U-value the renovated wall is designed to reach, the detailing at every window, sill, base and roof junction, and the finish all move it. Any câmara paperwork is a line of its own. As of 2026 the quote is free and comes before work starts.