From the apartment blocks of Queluz and Cacém to the damp of the serra and the sea air in Colares, each part of Sintra wears its windows down in its own way.
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In Agualva and Mira-Sintra, 82% of homes predate 1991 (2021 Census) — built before Portugal had any thermal insulation rules. Thin original frames, cold nights, and trains going past: acoustic glass and proper sealing change how you sleep.
The serra creates its own climate: fog, drizzle and walls that never quite dry out. With single glazing, water condenses on the glass and runs down every morning. Double Low-E glazing keeps the inner pane warm and stops the dripping and the mould.
A third of the homes in Colares are second residences (2021 Census). Closed up for months with Atlantic sea air at work, a house needs frames that don't corrode or need repainting — and that ventilate in tilt mode without standing open.
Portugal's winter climate zone is set by altitude, not by municipality: from about 240 m up — the serra and the high parts of town — the legal maximum Uw drops from 2.80 to 2.40 W/m²·°C. Our windows meet both; we confirm your case at the measurement.
Choose the window type, glass and colour, and see the price without giving contact details. The final price is confirmed after a free measurement.
White PVC with double Low-E glazing, fitting and removal of the old frames included.
| Window type | Typical size | Installed, VAT incl. |
|---|---|---|
| Fixed window | 100×100 cm | €210–270 |
| Tilt-and-turn | 120×120 cm | €270–350 |
| Sliding window | 150×120 cm | €330–420 |
| Balcony door | 90×210 cm | €440–560 |
| Sliding door | 200×210 cm | €1,050–1,340 |
Figures from our calculator — adjust to your measurements for an exact estimate.
By home type, window type and the problem left behind.
Condensation solved 
Sealing and security 
Noise cut out 
Anthracite aluminium 
Kitchen with a view 
Full project Photos from our own completed jobs. We share more references from work near you during the on-site visit.
Representative examples of the homes and problems we solve most often around here.
The building is from 1974, two minutes from the station. Between the trains and the draughts, sleep was hard to come by.
Asymmetric acoustic glazing and new sealing. The trains faded into background noise and the draughts stopped.
Chat on WhatsAppEvery morning the bedroom window ran with water. The paint around the frame started to blister.
Double Low-E glazing in a PVC frame. The inner pane stays warm and the condensation is gone.
Chat on WhatsAppThe house is old and the serra damp gets in everywhere. In winter the bedrooms smell of mould.
Frames that actually seal, with tilt-and-turn opening to air the house without chilling it. The mould smell is gone.
Chat on WhatsAppThe holiday house sits closed most of the year, this close to the sea. The old frames were eaten away by the salt air.
PVC that doesn't corrode and needs no upkeep, sealed tight for the months the house stands empty.
Chat on WhatsAppWe also cover:
Our own team covers the whole municipality, from Queluz and Cacém to the Colares coast. We also cover Amadora, Cascais and Mafra.
JanelaFix · Praça de Londres 12, 4.º Dto, 1000-189 Lisboa · Mon–Fri, 8am–8pm, by appointment · Open in Google Maps
It depends on the number of openings and the glass. For a typical 2-bedroom flat in Queluz, Massamá or Cacém, a full replacement usually comes to between €1,800 and €3,200, with fitting, removal of the old frames and warranty included. The calculator gives you an estimate in a minute, no contact details needed.
Next to the rail line, yes. Asymmetric acoustic glazing cuts around 42 dB, against roughly 30 dB for a standard double unit — the difference between hearing every train and a faint background hum. It's the single biggest sleep upgrade you can make in a building near the station.
Because of the serra's damp and cold glass. Humid air condenses on the coldest surface in the house — single glazing or an old double unit. With double Low-E glazing the inner pane stays warmer and the water stops forming; tilt-and-turn opening lets you air the house without chilling it.
Most of the municipality is in winter zone I1, with a maximum Uw of 2.80 W/m²·°C (Portaria 138-I/2021). But the zone is set by altitude — from about 240 m up, in the serra and the high parts of town, zone I2 applies and the limit drops to 2.40. Our PVC windows with double Low-E glazing sit below both values.
It depends on the zone. In the historic centre and the classified landscape, the municipality can require specific frame materials, colours or designs. We tell you straight at the measurement — and where PVC isn't accepted, we propose compliant alternatives rather than risk an embargoed job.
Still unsure between materials? Compare PVC and aluminium or see our aluminium windows.
Reply within one business day. No commitment and no large deposit.
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