PVC window installation in Mafra
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- Town
- Mafra
- District
- Lisboa
- Position
- 38°56′ N · 9°20′ W
- Tilt and turn: opens to the side and tilts for fresh air.
What will it cost? Start with the sizes
Window type
Material
Colour
Sizes
Between 600 and 1800 mm
Between 300 and 2200 mm
A rough size is fine.
Extras
Window schedule
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About Mafra
Mafra lies in the north-west of the Lisbon Metropolitan Area and, with Sintra and Cascais, is part of the Atlantic fringe north of the capital. Its neighbours are Torres Vedras, Sobral de Monte Agraço, Arruda dos Vinhos, Loures and Sintra. The relief is very rugged, from sea level up to about 430 metres, with hills and knolls that are old volcanic cones.
The coast is almost all cliffs, up to 25 metres high, with sand at the foot. This is where Ericeira is, a fishing town known for its sea urchins, its beaches and surfing. The ocean dominates the climate of the municipality.
Mafra town is small and has always revolved around the Convent, whose first stone was laid in 1717. The military have been part of local life since the 19th century. The Tapada Nacional is another large green space.
With the A8 and A21 motorways, between 2001 and 2011 the population grew 38.8 %, the biggest rise in the Metropolitan Area. There are also industrial areas, such as the Venda do Pinheiro–Malveira axis. Among villages, towns and coast, a home has to get along with the wind and damp of the Atlantic.
What the climate of Mafra asks of windows
According to Wikipedia, the climate of Mafra has a strong ocean influence. Summer is cool and windy, with a tendency for fog, and winter minimum temperatures are mild. The yearly mean is around 15 °C, one of the lowest in the Lisbon Metropolitan Area. Air humidity is near 80 % and 500 to 700 mm of rain falls a year, mostly from October to March. Prevailing winds are from the north and north-west.
Mafra sits between hills and the Atlantic. Summer is cool and windy, with morning fog.
The drawing shows a house near the coast. The air is damp all year and the north and north-west wind rules.
- North and north-west wind
The wind blows from the north and north-west at moderate speed, and stronger between seasons, when south-west gusts appear. On the coast and on the knolls there is not much to stop it. Windows on exposed sides need seals in good condition and well-adjusted latches, because whistling is usually a sign of a gap.
- Sea air and morning fog
Sea air brings salt and damp, and foggy mornings leave the glass wet, especially in Ericeira and near the cliffs. On latches and hinges salt settles and causes rust if there is no cleaning. Choose good finishes and rinse the frames now and then.
- High humidity all year
Air humidity stays high through the year, and more so in summer and near the coast. In homes that are not aired enough, that gives patches of mould behind furniture and in corners. A new window helps if the glass insulates well, but the air has to circulate.
- Cooler coastal sun
Summer is cool, and near the sea cloud reduces sun hours. The heat bites less than in Lisbon, and many windows need little sun protection. Still, think about the west facades of detached houses, where the afternoon sun hits head-on.
| Condition | Level | Climate sheet |
|---|---|---|
| Summer | Low | Cool and windy. |
| Winter | Medium | Mild minimum temperatures. |
| Rain | Medium | Wet half-year from October to March. |
| Wind | High | North and north-west dominate; stronger south-west between seasons. |
| Humidity | High | High all year, more on the coast. |
| Sun | Medium | Fewer sun hours near the coast, because of cloud. |
Levels for comparison, not measurements.
SourcesWikipédia: Mafra (Portugal)
Climate zone of Mafra
Portugal's building energy rules put every place in a winter zone (I1 to I3) and a summer zone (V1 to V3). In Mafra the zone depends on the altitude of the building, so we show the ranges.
| Building altitude | Winter zone | Maximum Uw, W/(m²·°C) |
|---|---|---|
| up to 243 m | I1 | 2.80 |
| from 244 to 537 m | I2 | 2.40 |
| above 538 m | I3 | 2.20 |
Summer zone: V3: up to 78 m; V2: from 79 to 278 m; V1: above 279 m
Maximum solar factor of windows (gtot,máx): up to 78 m, V3: 0.10 in weak-inertia spaces and 0.50 in medium or strong inertia spaces; from 79 to 278 m, V2: 0.10 in weak-inertia spaces and 0.56 in medium or strong inertia spaces; above 279 m, V1: 0.15 in weak-inertia spaces and 0.56 in medium or strong inertia spaces. The value is for the opening with the solar protection fully activated. North-facing windows are exempt. What is the solar factor?
The maximum Uw applies to windows in housing in new and renovated buildings (Portaria n.º 138-I/2021), with exceptions, for example conservation works. The zone is calculated with the Manual SCE method, from the region (NUTS III) and the altitude, not by parish. Ask the designer or an SCE expert to confirm the one for your building. Checked on 19 October 2026. What is Uw?
Solutions table for Mafra
| Window | Glass | |||
|---|---|---|---|---|
| Local condition | PVC | Aluminium | Double glazing | Triple glazing |
North and north-west wind | SuitableHolds up well, with good seals and an installation without gaps. | SuitableStiff and strong. Check the seals and the latch. | SuitableHelps hold back the air and the noise of the wind. | Needs careHeavier: needs strong hardware where it is very windy. |
Sea air and morning fog | SuitableDoes not rust or rot. Good in damp, salty air. | Needs careDamp, salty air calls for a good finish and cleaning. | SuitableThe glass does not mind. Look after the seals. | SuitableSame as double glazing on this point. |
High humidity all year | SuitableInsulates well against cold and helps avoid water on the glass. | Needs careNeeds a thermal break so the frame does not get cold and wet. | SuitableThe inner pane stays less cold. You still need to air the home. | SuitableThe inner pane stays even warmer. Air the home anyway. |
Cooler coastal sun | SuitableGood. The sun is milder near the sea, and light counts. | SuitableSlim frames let in more light on a grey day. | SuitableA good choice. It needs little solar coating here. | It dependsMay darken the room. Ask how much light it lets through. |
- Suitable
- Needs care
- It depends
Near the sea, ask the installer to check hardware, latch and edge finishes. The rest is confirmed on site.
Homes in Mafra
The homes in the area change what is worth asking of the windows.
Historic centre
Ericeira and Mafra town have old houses on small streets, near the sea and the Convent. Near monuments there may be facade rules. Talk to Mafra town council and ask the installer to check the state of the walls before measuring.
Detached and semi-detached houses
On the knolls, in the villages and near the cliffs there are detached houses, with more wall exposed to the wind. The higher and more open the spot, the more wind and rain hit the windows. It is worth reinforcing seals and latches on the north and north-west sides.
New apartments
With the growth of Mafra, Malveira and Venda do Pinheiro, there are more recent blocks and developments. The windows are newer, but air damp and wind still count. Ask how the edge finish and ventilation are done.
How it works
Tell us what you need
Measure the opening on the drawing and confirm your town.
We pass your request to the right companies
We process your request and send it to the local companies that best fit your town and what you asked for.
The companies contact you with quotes
They get in touch and send you their quotes and offers. Compare them and choose, with no obligation.
We do not make or fit windows. We pass your request on and explain.
Towns near Mafra
Do not live right in Mafra? These are the neighbouring municipalities and Ericeira.
Cannot find your area? Write it in the request.
Ericeira: salt and wind all year
In Ericeira, homes sit near the cliffs and the sea, and salt and wind reach the hardware and seals all year. It is a town known for surfing, fishing and beaches such as Ribeira d’Ilhas. People who live there should ask for a finish and a latch designed for sea air, and confirm that the edge between window and wall lets no water in. After some years, it is worth checking the seals. In buildings of several heights near the sea, the upper floors catch more wind.
Convent, Tapada and the lower town
Mafra town grew around the Convent and, through the 19th century, kept growing towards the monument. People in old houses next to the Convent live with old walls and possible facade rules. Further away, in the newer parts of Malveira or Venda do Pinheiro, homes are more recent. Tell the installer which area you live in, because what suits an old house is not what suits a new block. Ask for a visit to check the state of the walls. If you live near monuments, keep the council’s answer in writing.
General notes
Over time, salt attacks metals and latches. PVC does not rust, but the hardware is metal. With aluminium, count on a good finish and a fresh-water rinse now and then. Homes by the cliffs need more attention than those inland.
A window that insulates well helps, but the main thing is airing every day. The problem is not the fog itself, it is still air inside the home. Avoid drying laundry indoors and open the windows briefly in the morning.
Near monuments there may be facade rules. Talk to Mafra town council first. Also say whether the building is a development. The installer should check the state of the wall and the edge finish.
Winter is mild, but there are detached, high-up houses that are colder. In those cases, triple can pay off. In homes by the sea, with a lot of wind, it is heavier on the hardware. Ask the installer for an opinion.
Rain arrives driven by the north and north-west wind, so one side takes much more water. The exposed facade needs more careful edge finishes and seals. If the window is new and water gets in, speak to the installer again, because it may be the frame drainage.
Yes. Give your town, and say whether you are nearer the sea or inland. JanelaCerta does not install windows: it passes the request to installers in the area.
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