Supplied and fitted across the UK
Triple glazed windows and doors, fitted across the UK
Three panes of glass, two argon-filled cavities and about half the heat loss through the glass of good double glazing. Free survey, guide prices published for every product, and a written quote that fixes the price.
- Free survey, every opening measured
- Frames, hinges and rollers rated for the weight of triple glass
- Glass build-up and U-value written on every quote
- Building Regulations sign-off where the law requires it
Double ≈ 1.1 · Triple ≈ 0.6 W/m²K
Lower is better. Source: BRE.
- Free surveyEvery opening measured
- Fixed written quoteFor the spec shown
- Regulations handledRules for each UK nation
- UK-wideEngland, Wales, Scotland, NI
- Guarantees in writingFrames, glass, fitting
The short answer
What is triple glazing?
Triple glazing is a sealed glass unit with three panes and two gas-filled cavities. With low-e coatings on two panes, the glass alone reaches a U-value of about 0.6 W/m²K, against about 1.1 for good double glazing, so it loses roughly half the heat. The inner pane stays warmer, which cuts draughts and condensation.
Double vs triple at a glance
| Measure | Good double | Triple |
|---|---|---|
| Glass U-value (Ug) | About 1.1 | About 0.6 |
| Whole window (Uw) | About 1.2 to 1.4 | About 0.8 to 1.0 |
| Glass weight | About 20 kg/m² | About 30 kg/m² |
| Price | Baseline | About 20 to 30% more |
What changes in the room
Why people choose triple glazing
Warmer glass
The inner pane stays closer to room temperature, so sitting by the window no longer feels like sitting by a cold wall.
Less condensation
A warmer inner pane and warm-edge spacers mean far less moisture on the inside of the glass, as long as rooms are ventilated.
Quieter with acoustic glass
The third pane adds a few decibels; a laminated acoustic pane makes the real difference on busy roads.
About half the heat loss
Through the glass, compared with good double glazing. Whole windows typically reach about 0.8 to 1.0 W/m²K.
Shop by product
Triple glazed windows, doors and upgrades
Every product below is surveyed, made to order and fitted. Prices shown are where each guide range starts, supply and fit, inc VAT.
Windows by frame material
Pick the frame first: it sets the look, the price and how long the window lasts.
uPVC windows
From £695The lowest-cost way to get three panes of glass, in white or a woodgrain finish.
Learn more →
Aluminium windows
From £1,095Slim, strong frames with thermal breaks, for big panes and modern homes.
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Timber windows
From £1,295Engineered timber frames, factory finished, for period homes and natural looks.
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Alu-clad timber windows
From £1,395Warm timber inside, a weatherproof aluminium shell outside.
Learn more →Window styles
Every style below is made triple glazed, in the frame materials that suit it.
Casement windows
From £695The standard side- or top-hung UK window, with a three-pane unit.
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Flush casement windows
From £845Sashes that sit flush in the frame, like traditional timber windows.
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Tilt and turn windows
From £795Inward-opening windows that tilt to vent and turn to clean.
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Sash windows
From £1,295Vertical sliding sashes for Victorian and Georgian homes, where the design allows.
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Bay and bow windows
From £2,995Three- and five-light bays, with the structure checked before fitting.
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Fixed and picture windows
From £745Big fixed panes for views, with the weight handled properly.
Learn more →Doors
Triple glazed glass panels in entrance, French, sliding and folding doors.
Composite front doors
From £1,395Solid-core front doors with triple glazed panels and multi-point locks.
Learn more →
French doors
From £1,295Pairs of opening doors to the garden, in uPVC or aluminium.
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Sliding patio doors
From £1,895Big sliding panes in uPVC or aluminium, with heavy-duty rollers.
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Bifold doors
From £4,295Folding aluminium doors that open the whole wall, with triple glass.
Learn more →Glass and upgrades
Glass-only replacement and specialist panes for noise and security.
Glass-only replacement
From £145Swapping double units for triple, where your frames can take it.
Learn more →
Acoustic triple glazing
From £745Laminated acoustic panes and uneven glass for busy roads and flight paths.
Learn more →
Security glazing
From £745Laminated panes, multi-point locks and PAS 24 tested windows and doors.
Learn more →Projects
Whole-house replacements, new builds, period homes, flats and low-energy builds.
Whole-house replacement
From £5,695Every window and door replaced in one planned visit.
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New builds and self-builds
From £11,195Window and door packages delivered and fitted to your build programme.
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Period homes and conservation areas
From £1,295Heritage-style frames, and straight advice on what your council will accept.
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Flats and apartments
From £945Replacing windows in a flat, with the planning and ownership consents checked first.
Learn more →
Passivhaus and EnerPHit
From £1,395Low-energy windows and installation details for certified and near-certified builds.
Learn more →Guide prices
What whole-house triple glazing costs
White uPVC, triple glazed throughout, fitted, inc VAT. Market figures for a 3-bed semi typically run from about £6,500 to £11,000 for windows only.
2-bed terrace
5 windows + front door
£5,695 – £7,195inc VAT · £4,745 – £5,995 ex VAT
- White uPVC, triple glazed
- All old frames removed and taken away
- One fitting team, usually 1 to 2 days
3-bed semi
9 windows + front door
£9,395 – £11,795inc VAT · £7,830 – £9,830 ex VAT
- White uPVC, triple glazed
- All old frames removed and taken away
- Usually 2 to 3 days on site
4-bed detached
12 windows + front door + French doors
£13,595 – £16,995inc VAT · £11,330 – £14,160 ex VAT
- White uPVC, triple glazed
- All old frames removed and taken away
- Usually 3 to 4 days on site
Guide prices, supply and fit. The written quote after your survey fixes the price for the specification shown; anything extra is agreed with you first.
Guide-price tool
Price your windows in under a minute
A few quick steps: what you need, the frame, the style, how many and any extras. You see a live guide price as you go, then send it to us and we call or email to book your free survey.
Start the guide-price toolChoose windows, doors or glass
Pick what you are replacing.
Pick the frame
uPVC, aluminium, timber or alu-clad.
Say how many
And roughly how big.
See your guide price
Then book a free survey.
Honest advice
Is triple glazing worth it for your home?
Usually worth it when
- You are replacing single glazing or failing double glazing
- Rooms face north, are exposed, or feel cold near the glass
- Bedrooms face a busy road (add acoustic glass)
- You plan to stay for many years
Good double glazing may be enough when
- Your windows are modern, sound and comfortable
- A lower energy bill is the only reason: upgrading good double glazing saves far less than replacing single glazing
- The frames cannot take a thick enough triple unit
- Big south-facing glass relies on winter sun
Reviews
Verified customer reviews will appear here
We only publish genuine reviews from customers whose jobs we have completed. Had work done with us? We would like to hear how it went.
What happens next
From enquiry to handover
Free survey
Every opening measured; escape windows, vents and bay structure checked.
Written quote
Frame system, glass build-up and U-value for each item. Price fixed for that spec.
Made to order
Typically 4 to 6 weeks for uPVC, longer for aluminium, timber and alu-clad.
Fitted and handed over
Each opening closed up the same day; guarantees, and Building Regulations sign-off where required, at handover.
Guides
Before you buy
Is triple glazing worth it?
When triple glazing pays back in bills, when it pays back in comfort, and when good double glazing is enough.
Read →Triple glazing cost guide (October 2026)
Per-window and whole-house guide prices, what changes the price, and how to compare quotes.
Read →
Building Regulations for replacement windows: England, Wales, Scotland and Northern Ireland
U-value limits, sign-off, trickle vents, safety glass and escape windows in each nation, plus VAT and grants.
Read →Can you put triple glazing in existing frames?
Why most double glazed frames cannot take a good triple unit, and the exceptions.
Read →FAQ
Triple glazing questions
Is triple glazing worth it?
When you are replacing single or failing double glazing, or have cold, noisy or north-facing rooms, yes. If your double glazing is modern and sound, the bill savings are small and the case rests on comfort. Read our full guide.
How much does triple glazing cost?
On our guide, triple glazed uPVC windows cost £695 to £1,695 each, fitted and inc VAT. A 3-bed semi with 9 windows and a front door is £9,395 to £11,795.
How much more is triple glazing than double?
Usually 20 to 30% more for the same window, within a UK range of about 15 to 40%.
Can I put triple glass in my existing frames?
Usually not usefully. Most frames take up to about 28 mm units, and a triple unit that thin performs no better than good double glazing.
Do I need planning permission?
Usually not for like-for-like windows on a house. In England, flats, Article 4 areas and listed buildings are the exceptions; the rules differ in Wales, Scotland and Northern Ireland, and our regulations guide covers each nation.
Does triple glazing reduce noise?
A little on its own. A laminated acoustic pane makes the bigger difference.
Is the survey free?
Yes, for windows, doors and glass-only jobs. The surveyor measures every opening and you get a written quote with no obligation. For island and some remote districts we confirm survey arrangements and any travel cost first.
How long does installation take?
A whole house usually takes 1 to 4 days. Each opening is closed up the same day.
Areas we cover
Triple glazing across the UK
Surveys and fitting are arranged across all four nations. Islands and some remote districts are by arrangement.
England
- Bedfordshire
- Berkshire
- Bristol
- Buckinghamshire
- Cambridgeshire
- Cheshire
- Cornwall
- County Durham
- Cumbria
- Derbyshire
- Devon
- Dorset
- East Riding of Yorkshire
- East Sussex
- Essex
- Gloucestershire
- Greater London
- Greater Manchester
- Hampshire
- Herefordshire
- Hertfordshire
- Isle of Wight
- Kent
- Lancashire
- Leicestershire
- Lincolnshire
- Merseyside
- Norfolk
- North Yorkshire
- Northamptonshire
- Northumberland
- Nottinghamshire
- Oxfordshire
- Rutland
- Shropshire
- Somerset
- South Yorkshire
- Staffordshire
- Suffolk
- Surrey
- Tyne and Wear
- Warwickshire
- West Midlands
- West Sussex
- West Yorkshire
- Wiltshire
- Worcestershire
Scotland
Free survey
Ready to see what triple glazing would cost?
Get a guide price in a minute, or book a free survey and get a written quote that fixes the price.
