Pilkington energy-efficient glass

Upgrade What’s Inside Your Windows

If your frames are still suitable, Energyglaze can replace the old sealed glass units with modern Pilkington energiKare™ energy-efficient glazing — without replacing the complete window.

Diagram showing how energy-efficient glazing retains heat using Low-E glass, argon gas and a warm-edge spacer

Thermal comparison showing heat escaping through standard older glazing before, and less heat escaping after upgrading to Pilkington energiKare glazing

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✓ Low-e coated Pilkington K Glass™ inner pane
✓ Warm-edge spacers and argon gas filling
✓ Free survey — honest advice on whether your frames are suitable

Prefer to talk? Call 01274 790650

FENSA Approved Installer · Reg. 44524 · HIP Dealer No. 002530

Request Your FREE Home Glazing Survey

Tell us what you’d like to improve and enter your postcode. We’ll call you shortly during opening hours to confirm survey availability in your area.

What would you like help with?

Approximate glazing age

Are you the homeowner?

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✓ Free and no obligation
✓ Honest advice on what your home actually needs
✓ We won’t recommend replacing suitable frames unnecessarily

We’ll use your details to respond to your request and arrange your free home glazing survey where available. See our Privacy Policy.

Why Pilkington?

Why We Use Pilkington Glass

Pilkington is one of the best-known names in glass. Its UK business is based in St Helens and is part of the NSG Group, one of the world’s leading glass manufacturers.

200

200 years of glassmaking

The Pilkington name has been in glass for around 200 years — and Pilkington invented the float glass process.

A low-e pioneer

The original Pilkington K Glass™ has been chosen for UK homes since 1989.

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Designed to reduce heat loss

Low-e glass reflects heat back into the room, giving much lower heat loss than ordinary glass.

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Plenty of natural light

Helps keep heat in while maintaining natural light levels in your home.

✓

Made for replacement glazing

Suitable for replacement and retrofit windows in uPVC, timber and aluminium frames.

Glass for every job

Pilkington also makes glass for solar control, safety and security, noise control and self-cleaning.

The low-e pane

Pilkington K Glass™ and Low-E Technology

Pilkington K Glass™ is a low-emissivity (low-e) coated glass, commonly used as the inner pane of an energy-efficient sealed unit.

What “low-e” means
Emissivity is how readily a surface gives off heat. A low-e coating is a poor radiator of heat, so less warmth escapes through the glass.

An extremely thin, invisible coating
It’s applied during glass manufacture, so it’s hard-wearing — and you won’t see it.

Still lets the daylight in
Daylight and useful solar energy still pass through. Some Pilkington low-e solutions are designed to make the most of this free “passive solar gain”.

Did you know?

The original Pilkington K Glass™ has been chosen for UK homes since 1989.

Inside the cavity

Argon and U-Values, Explained Simply

The gap between the panes matters as much as the glass. Here’s what argon does, and how to read a U-value.

Tap or click the graphic to view it full size.

Watch

See energiKare™ Glazing in Action

A short official video from Pilkington about energiKare™ glazing.

Playing this video will connect to YouTube. See our Cookie Policy.

Video: Pilkington (PilkingtonTV on YouTube).

Download the Pilkington energiKare™ brochure →

Seen through a thermal camera

Where Your Heat Escapes

A thermal camera shows warmth as bright colour. On the older glazing, the windows glow where heat is escaping. After upgrading to Pilkington energiKare™ glazing, far less heat shows through the glass.

Illustrative comparison. Every home is different — results depend on your property, frames and existing glazing.

Old vs new

Older Double Glazing vs a Modern Energy-Efficient Unit

Before

Older or basic double glazing

✕ May have no modern low-e coating
✕ Older seals may have lost performance
✕ More heat can escape through the glass
✕ Units can mist up if the seal fails

After

Modern energy-efficient unit

✓ Low-e coated glass, such as Pilkington K Glass™
✓ Insulating sealed cavity
✓ Argon gas where specified
✓ Improved thermal performance
✓ Can often fit suitable existing frames

Cold stays outside, warmth stays in: that’s the difference a modern energy-efficient unit makes.

The Energyglaze approach

Replace the Glass. Keep Your Frames.

You may not need new windows.

If your frames are structurally sound and suitable, we’ll assess whether replacing just the sealed glass units is a better option than replacing the entire window.

✓ Keep suitable existing frames
✓ Less disruption than full replacement
✓ Clear, honest advice on what you actually need

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Which option is right for you?

Frames still sound?

Replace just the sealed units with Pilkington energiKare™ glass and keep your frames.

Frames damaged, rotten or worn out?

Complete replacement uPVC windows may be the better choice.

See replacement uPVC windows →

We check your frames during the free survey and tell you honestly which option makes sense.

How it works

Three Simple Steps

Request your free survey

Fill in the short form or call us on 01274 790650. Enter your postcode so we can confirm survey availability in your area.

We call and arrange a convenient visit

We’ll call you shortly during opening hours to discuss what you’d like to improve and arrange a survey at a time that suits you.

We inspect and talk through your options

We inspect your glass and frames, explain our findings — including whether your frames are suitable to keep — and talk you through your options. If you decide you’d like to proceed, we can then provide the appropriate quotation and arrange installation.

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Trusted Products. Professionally Installed. Added Protection.

Pilkington energiKare™

Recognised energy-efficient glass

HIP Protection

10-year insurance-backed guarantee & deposit protection

Documentation and certificate provided through HIP, in line with our process.

HIP Dealer No. 002530

Learn more about your protection →

FENSA Approved Installer

Registration 44524

Why choose a FENSA Approved Installer? →

What Our Customers Say

★★★★★

“Energyglaze Glass have been wonderful from the start. We have had the glass upgraded to Pilkington energy-efficient glass, and the house feels warmer already. Thank you!”

Leah B · Trustpilot

★★★★★

“I recently had 6 glass windows replaced with this company. They were very reliable and trustworthy. My husband and I had no problems from start to finish. Have recommended them to our friends.”

Rihanna Khan · Trustpilot

★★★★★

“Great service from start to finish. The team were professional, friendly, and fitted the windows to a high standard. Everything was left clean and tidy, and the results look great. Would definitely recommend.”

Kiran · Trustpilot

Read our reviews on Trustpilot →

Glass Replacement FAQs

Can you replace just the glass and keep my existing frames?

Yes, where the frames are suitable. We check their condition during your free survey and will tell you honestly whether they can be kept.

How do I know if my sealed units have failed?

The most common sign is condensation or a cloudy haze between the two panes that can’t be wiped away. It usually means the seal around the edge of the unit has broken down.

What is Pilkington energiKare™?

It’s Pilkington’s range of energy-efficient sealed glass units for homes. The units we install combine a low-e Pilkington K Glass™ inner pane with a Pilkington Optiwhite™ outer pane, warm-edge spacer bars and an argon gas filling.

Will low-e glass make my rooms darker?

No. The low-e coating is invisible and is designed to let daylight through, while reflecting room heat back inside.

Why might new glass mist up on the outside?

On cold, clear mornings, condensation can occasionally form on the outside of energy-efficient glass. Pilkington explains this happens because less heat escapes through the glass, so the outer pane stays cooler — a sign the glazing is insulating well.

Is replacing the glass messy or disruptive?

Replacing sealed units is usually much less disruptive than replacing complete windows, because the frames stay in place. Our team always leaves your home clean and tidy.

Is the survey free?

Yes. The survey is free, with no obligation to go ahead. If you decide you’d like to proceed afterwards, we’ll then provide a clear quotation.

What if my frames aren’t suitable to keep?

We’ll explain why, and we can also quote for complete replacement uPVC windows if that’s the better option for your home.

Not Sure If You Need New Glass or New Windows?

Let us take a look. We’ll tell you honestly whether your existing frames are suitable and what your options are. If the frames are past their best, see our replacement uPVC windows.

REQUEST MY FREE SURVEY

Or call us on 01274 790650