Triple Glazing for uPVC Windows

Triple glazing is worth considering if your home sits on an exposed site, faces a busy road, has large north-facing openings or you simply want the warmest window you can buy. For many ordinary rooms a well-specified double-glazed unit with low-emissivity glass gets you most of the way there. We offer both across our uPVC window range, so the survey is about what suits each opening rather than selling you the most expensive option.

A triple-glazed sealed unit has three panes of glass separated by two sealed cavities. Each cavity is another layer of still gas that slows heat moving from the warm room to the cold outside. The inner pane stays closer to room temperature, which is why triple-glazed windows feel less chilly to sit beside and are less prone to condensation on the room side.

Warmth is the headline. The second cavity lowers heat loss through the glass, and on a cold, windy night the difference can be felt near the window. Sound is the second benefit: the extra pane and cavity add mass and separation, which helps with steady traffic noise, though laminated acoustic glass in a double unit can be the better tool for loud, low-frequency noise.

There are trade-offs worth knowing. Three panes weigh more, so hinges and frames must be specified to carry them. Slightly less daylight passes through, and less free heat from winter sun, which matters more on south-facing glass. The unit is thicker, so the frame has to be designed to accept it. That is why we build on Eurocell multi-chamber profiles, which are BBA certified and designed to take double or triple glazed units as one system.

Bedrooms on a main road. Living rooms with a large picture window. Farmhouses and hillside homes that take the full force of the weather. Loft rooms where the window is one of the few places heat can escape. In these spots the extra pane earns its keep day after day.

In a sheltered kitchen or a small cloakroom window the gain is smaller, and double glazing with Planibel A low-e glass is often the sensible choice. You do not have to pick one for the whole house: we can mix specifications room by room, keeping the frames and sightlines matching so nobody can tell from the street.

Every window we supply is uPVC and made to measure. At the free survey we measure each opening, look at which way it faces and what sits outside it, and talk through the styles: casement, flush casement, tilt and turn and fixed lights are all available with triple glazing. You choose colours and woodgrain foils at the same time.

Fitting is carried out by FENSA and CERTASS registered installers, so the work is self-certified under Building Regulations and you receive the certificate for your records. Finance is available through our FCA-authorised arrangement (FCA 1055332) if you would rather spread the cost of a larger project.

When you compare quotes, ask what glass is in each pane, whether the spacers are warm-edge, what gas fills the cavities and which frame system carries the unit. Two quotes that both say triple glazing can be quite different windows. Our comparison guide on double versus triple glazing goes into the numbers behind the labels if you want the detail.

People often ask whether triple glazing will make a room too dark, whether it is worth it on a sunny side of the house, and whether the frames look bulkier. The daylight loss is small and rarely noticed in everyday use. On south-facing glass the lower solar gain is worth weighing against the extra warmth. The frames themselves look the same from the street, because the unit sits within the same Eurocell profile system as our double-glazed windows, so a mixed specification across the house is not visible from outside.