Triple glazed sliding doors across County Londonderry
The right door depends on the opening, the room and the way you use the garden. Here is how triple glazed sliding doors tend to work out in practice:
Is your County Londonderry property beside a main road, railway or flight path? Ask about an acoustic laminated pane within the triple glazed unit.
Wherever you are in County Londonderry, ask at survey whether triple glazing will limit the panel sizes on the system you prefer for your County Londonderry home.
- Warmer inner glass makes condensation on the room side less likely, which helps protect window boards, blinds and flooring near the door.
- Solar-control or low-iron glass can be combined with triple glazing, so you can tune the unit for an overheating west-facing room or for maximum clarity.
- A second gas-filled cavity cuts heat loss through the glass, giving typical whole-door U-values of around 0.8–1.1 W/m²K, depending on the system and specification.
Guide prices for triple glazed sliding doors in County Londonderry
Use these guide prices to budget. They include VAT, fitting and taking away an old door of a similar size. Taller doors, triple glazing and dual colour add to the figure — the online tool shows how much.
| Overall width | Typical panels | Guide price (fitted, inc VAT) |
|---|---|---|
| 1.5 m | 2 panels | £3,695–£4,595 |
| 3.0 m | 2 panels | £5,595–£6,795 |
| 3.6 m | 3 panels | £6,295–£7,695 |
| 6.0 m | 4 panels | £9,295–£11,295 |
Every size is on the triple glazed sliding doors page.
Daylight and glass in County Londonderry
In County Londonderry the shortest day has roughly 7 h 10 min of daylight and the longest about 17 h 22 min. The noon sun sits near 12° above the horizon in winter and 58° in summer — so glass that faces south collects useful warmth from October to March, while a west-facing door may need solar control to stop it overheating in July.
Where we fit in County Londonderry
We cover Derry/Londonderry, Coleraine, Dungiven, Limavady, Maghera, Magherafelt and the rest of County Londonderry. All of County Londonderry is covered by arrangement: the survey is still free, and survey dates, delivery and any travel cost for delivery and fitting are confirmed in your quote.
Approvals in Northern Ireland
Building control in Northern Ireland is run by district councils under the Building Regulations (Northern Ireland). We take on work in Northern Ireland by arrangement and confirm what approval your door needs before anything is ordered.
Questions about triple glazed sliding doors in County Londonderry
How soon can you survey in County Londonderry?
Survey dates in County Londonderry are arranged individually 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.
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.
How much heavier is triple glazing?
A triple glazed unit is typically a third to a half heavier than a double glazed unit of the same size, because of the extra pane of glass. On a large sliding panel that can add a significant amount of weight, which is why the frame, track and rollers must be designed and rated for it. Some systems reduce the maximum panel size.
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.