Triple vs Double Glazing – What Trade Professionals Need to Know

In Summary

• Double glazing remains the go-to option for cost-effective, reliable energy performance

• Triple glazing provides better insulation, noise reduction, and lower energy bills

• Triple glazing costs more and is heavier to install, requiring careful project planning

• U-values can be as low as 0.6 with triple pane windows, reducing heat loss by up to 50%

• The best option depends on the client's priorities: budget, location, and insulation goals

Choosing the Right Glazing for the Job

As trade professionals, we’re often asked: is triple glazing better than double glazing? 

The answer depends on your client’s property, performance goals, and budget.

Both glazing types come with significant benefits, but understanding the key differences in performance, insulation, cost, and installation will help you make an informed decision.

At True Window & Glass, we’ve worked with thousands of installers and clients across Lincolnshire and beyond—so here’s our no-nonsense breakdown to help you guide your next glazing project.

Key Differences at a Glance

Feature	Double Glazing	Triple Glazing
Panes of Glass	2 panes	3 panes (extra pane of glass)
U-Value	~2.8	As low as 0.6
Heat Loss	Moderate	Significantly reduced
Energy Savings	Good	Excellent
Noise Reduction	Effective	Enhanced (up to 40dB)
Weight & Frame Requirements	Standard	Heavier, may need stronger window frames
Cost	More affordable	Higher cost (typically 20–30% more)
Best For	General UK homes	Colder climates, noisy areas, high-spec homes

The choice between double and triple glazing often depends on your priorities.

Performance in Real Terms

U-Values and Insulation

Double glazing typically delivers U-values of around 1.4 W/m²K, while triple glazing can reach as low as 0.6 W/m²K—a notable improvement in terms of insulation.

That additional pane of glass creates an extra barrier against heat loss, especially when filled with argon or krypton gas.

Verdict:

Triple glazing offers the best performance, particularly in colder climates or where thermal retention is a top priority.

Triple glazing will offer you more energy savings.

Energy Efficiency Ratings - Lowering Heating Costs

Triple-glazed units offer up to 50% improved energy performance compared to standard double-glazing.

That means better energy efficiency, more consistent indoor temperatures, and reduced heating costs.

Over time, these energy savings can offset the extra cost, a significant selling point for the majority of households.

Verdict:

For high-efficiency projects or clients focused on sustainability, triple pane windows are the right call.

Cost Considerations

On average, triple glazing will cost 20–30% more than double glazing.

That’s down to the extra layer of glass, heavier units, and higher-spec coatings and gas fills.

For many clients, the additional cost pays off in the long term through lower energy bills and increased property value.

Though budget-conscious projects may still favour double glazing, especially in milder areas.

Verdict:

Double glazing is often still the best option for standard domestic jobs—unless the client is investing in low-carbon footprint, new windows, or passive house standards.

Triple glazing usually costs 20% - 30% more than double glazing.

Installation Challenges

Weight, Frames & Labour - What Difference Does the Glazing Make?

With more layers of glass, triple glazing units are heavier and bulkier.

That adds pressure on window frames, and in some cases, may require structural reinforcements.

From an installer’s perspective, the installation process is also more involved, so allow extra time and labour.

Double vs Triple Glazing: Quick Decision Guide

Choose Triple Glazing If...	Choose Double Glazing If...
The property is in a colder climate	The property is in a milder region
Maximum energy efficiency is a key priority	Standard efficiency levels are acceptable
Noise reduction is important (e.g. busy roads)	Noise isn’t a major concern
Security is a high priority	Standard security is sufficient
Budget allows for a higher upfront cost	Budget is more limited
It’s a new build or full renovation	It’s a retrofit or light upgrade

 Glazing Solutions from True Window & Glass

At True Window & Glass Centre, we work with both double and triple glazing, offering trade partners reliable, high-performing options tailored to the project.

✅ Based in Lincoln, we cover Newark, Gainsborough, Grantham, Sleaford, and the wider Lincolnshire region

✅ 40+ years of experience with over 2,000 satisfied clients

✅ 24/7 emergency glazing & boarding-up service on 01522 500892

✅ Products include uPVC and aluminium windows in all configurations—casement, flush sash, tilt & turn, box sash, and more

✅ Doors in composite, aluminium, and uPVC, plus bi-fold, patio, and French doors

✅ Full range of conservatories, orangeries, roof lanterns, and porches

✅ Fully accredited: FENSA, GGF, CHAS, Install Sure, and the National Federation of Glaziers

If you’re a local installer looking for reliable window glass, advice on the type of glass and coatings, or a quote on triple vs double glazing, we’re here to help. Give us a call today on 01522 500892.

FAQs

Q: Is triple glazing always better than double glazing?

Not always. It depends on the client's needs, budget, and property type. In colder climates or for premium builds, triple glazing can be the better energy efficiency choice. For general domestic projects, double glazing still holds strong.

Q: What’s the lifespan of triple glazing?

Typically 20–35 years, depending on maintenance and installation. Over time, the gas between panes can leak, reducing insulation performance.

Q: Does triple glazing reduce noise?

Yes—triple pane configurations can offer up to 40dB of noise reduction, ideal for properties near busy roads or flight paths.