If your loft or extension needs more daylight, you have probably come across triple glazed skylights while browsing options. They cost more than standard glazing, so it is fair to ask if the extra spend is justified. This matters most when a large roof opening is involved.
This guide covers how they perform, what they cost, and whether they suit your roof. At Skylights Roof Lanterns, we get asked this question every week from homeowners across the UK.
Why Triple Glazed Skylights Are Gaining Popularity
Triple glazed skylights use three panes of glass instead of two, with a gas filled gap between each one. This extra layer cuts heat loss through the roof, which matters most in winter. Many UK homeowners are choosing triple glazed skylights because energy bills keep rising and building rules keep tightening. A well fitted triple glazed rooflight can also reduce condensation on cold mornings, since the inner pane stays closer to room temperature.
How Triple Glazed Skylights Compare to Double Glazing
The table below gives a quick side by side view for anyone weighing up their options before buying.
|
Feature |
Double Glazed |
Triple Glazed |
|
Panes of glass |
2 |
3 |
|
Typical U-value |
1.6 to 2.0 W/m²K |
0.8 to 1.2 W/m²K |
|
Heat retention |
Good |
Better |
|
Noise reduction |
Moderate |
Higher |
|
Upfront cost |
Lower |
Higher, roughly 15 to 25% more |
|
Best suited for |
Mild rooms, budget projects |
Cold rooms, north facing roofs, new builds |
Neither option is wrong. It depends on your roof, your budget, and how long you plan to stay in the property.
Do Triple Glazed Skylights Actually Save Money?
The short answer is yes, over time. A lower U-value means less heat escapes through the glass, so your heating system does not work as hard. Current UK building regulations for windows and rooflights set strict thermal limits for new work and major refurbishments. Triple glazed units generally sit well within these limits, while some older double glazed products struggle to comply.
Savings will vary depending on your home, your heating type, and your local climate. Homes in colder or more exposed parts of the UK typically see the fastest return on the extra spend.
Where This Glazing Makes the Most Sense
Not every roof needs the highest specification available. Energy efficient skylights of this type tend to pay off fastest in these situations:
- North facing rooflights that get little direct sun
- Loft conversions used as bedrooms or offices
- Homes near busy roads, where the extra pane also cuts noise
- New builds or extensions that must meet current building regulations
If you already have a modern double glazed skylight, our pitched roof skylights buying guide can help. It explains when upgrading is worth it.
What Affects the Price of Triple Glazed Skylights
Cost depends on size, frame material, and whether the unit opens or stays fixed. Aluminium frames tend to last longer than uPVC in exposed positions, though both are common choices.
Self cleaning coatings and tinted glass also add to the price. It is worth getting a written quote that breaks down glass, frame, and fitting costs separately, so you can compare products fairly.
Our range includes a triple glazed self clean rooflight built for UK weather. Fixed and opening options are available for different rooms and budgets.
Things Worth Checking Before You Buy
Not all triple glazed units perform the same, even at a similar price. Check the whole window U-value rather than just the centre pane figure, since frame quality affects the total result. A good supplier should confirm BBA certification and warranty length in writing before you order.
If you are specifying energy efficient skylights across a full extension, try to match frame colours and opening styles. This keeps the finished roofline looking neat and considered.
Installation and Maintenance Notes
Fitting a heavier unit usually takes no longer than a standard double glazed one. That said, the extra weight means an older roof structure should be checked first. Cleaning is much the same as any rooflight. Many triple glazed rooflights now include coatings that cut down how often you need to get up on the roof.
Energy efficient skylights of any type work best when fitted correctly. Proper sealing around the frame stops draughts creeping back in over time.
Final Thoughts
Triple glazed skylights are not essential for every home. They are a sound choice for cold rooms, noisy locations, and projects that must meet current building rules. The Energy Saving Trust notes that better glazing cuts draughts and cold spots across a property. The same logic applies to your roof.
The extra upfront cost is usually paid back through lower bills and a warmer room over the years ahead. If you are still weighing up your options, our team can talk you through sizes and prices. There is no pressure to buy on the spot. Call us on 0204 538 3079, or send an enquiry through the site. We will suggest the right specification for your roof.
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