Triple glazed sliding doors across Northamptonshire
Most homeowners choosing triple glazed sliding doors want the same things: more light, a clear view and a door that is easy to live with.
Is your Northamptonshire property beside a main road, railway or flight path? Ask about an acoustic laminated pane within the triple glazed unit.
Wherever you are in Northamptonshire, ask at survey whether triple glazing will limit the panel sizes on the system you prefer for your Northamptonshire home.
- Laminated safety glass can be used as the inner or outer pane of a triple glazed unit, adding security and sound reduction without changing the look of the door.
- Triple glazed doors typically come in well under the 1.4 W/m²K limit that Approved Document L sets in England for a new or replacement door in an existing home with more than 60% glazing.
- In homes heated by a heat pump or underfloor heating, which run at lower temperatures, reducing heat loss through a large door helps the system keep the room comfortable.
Guide prices for triple glazed sliding doors in Northamptonshire
The table shows guide prices for common sizes, supplied and fitted, including VAT. Your exact price is fixed in a written quote once the opening in your home has been measured.
| Overall width | Typical panels | Guide price (fitted, inc VAT) |
|---|---|---|
| 2.1 m | 2 panels | £4,495–£5,495 |
| 3.6 m | 3 panels | £6,295–£7,695 |
| 4.0 m | 3 panels | £6,795–£8,295 |
| 4.8 m | 4 panels | £7,795–£9,495 |
Every size is on the triple glazed sliding doors page.
Daylight and glass in Northamptonshire
Because Northamptonshire sees long summer days (about 16 h 48 min) and short winter ones (about 7 h 41 min), the elevation your door faces makes a real difference. With the midday sun at about 14° in winter, a south-facing door brings light well into the room; a west-facing door catches hot late-afternoon sun in summer.
Where we fit in Northamptonshire
We cover Northampton, Corby, Kettering, Wellingborough, Rushden, Daventry and the rest of Northamptonshire.
Approvals in England
In England, a replacement sliding door is a controlled fitting under the Building Regulations. In an existing home, a door with more than 60% glazing must reach a U-value of 1.4 W/m²K or better (or a Doorset Energy Rating of band C) under Approved Document L, and glass in doors must be safety glazing under Approved Document K. We arrange compliance through a competent person scheme installer or by notifying Building Control, and you receive the certificate.
Questions about triple glazed sliding doors in Northamptonshire
How soon can you survey in Northamptonshire?
Surveys in Northamptonshire are booked at a time that suits you, and we offer survey dates when we reply to your enquiry. After you approve the written quote, manufacture is typically 4–6 weeks after survey sign-off; some triple glazed units take a little longer.
What U-value does a triple glazed sliding door achieve?
A triple glazed thermally broken aluminium sliding door typically achieves a whole-door U-value of around 0.8–1.1 W/m²K, depending on the system, the glass coatings, the gas fill and the panel sizes. A good double glazed equivalent is typically around 1.2–1.6 W/m²K. Lower numbers mean less heat lost through the door.
Does triple glazing make sliding doors harder to open?
A well-designed triple glazed sliding door should still open smoothly, because the panel runs on rollers that carry the weight, but it takes slightly more effort to start a heavier panel moving. On very large panels, a lift and slide mechanism is often used instead, which raises the panel off its seals before it slides.
Why is there condensation on the outside of my triple glazing?
Condensation on the outside pane on cold, clear mornings is a sign that triple glazing is working. So little heat escapes through the unit that the outer pane can drop below the dew point of the air outside, and moisture forms on it. It clears as the day warms and does not mean anything is wrong with the door.