Most popular
Glass-Only Upgrade
- Drops into existing 28mm frames
- 60% less heat loss
- 1-day install most homes
Learn more
Certified Regency Triple® installer · Scotland
Triple-glazing
performance.
Same windows.
Upgrade to next-generation triple glazing — without replacing your window frames. Regency Triple® drops into your existing 28mm units. 60% less heat loss, only 5% heavier, fitted in a day.
Free survey, no obligation
Available this week
FENSA Registered
Which? Trusted Trader
Checkatrade Approved
TrustMark Certified
10-Year Guarantee
A+ Energy Rated
Glasgow City Council Verified
FENSA Registered
Which? Trusted Trader
Checkatrade Approved
TrustMark Certified
10-Year Guarantee
A+ Energy Rated
Glasgow City Council Verified
Certified Regency Triple installerTriple-glazing performance.
Triple-glazing performance.
Double-glazing thickness.
Regency Triple® featuring Corning® Enlighten™ Glass is a breakthrough glazing unit. By using an ultra-thin 0.5mm middle pane, it delivers the thermal performance of conventional triple glazing — at the weight and depth of standard double glazing. Most often: no frame replacement needed.
28mm Regency Triple
U-value 0.8 W/m²K
The difference is clear
28mmStandard upgrade
Drops into existing 28mm frames
U-value
0.8 W/m²K
Weight
21 kg/m²
36mmEnhanced performance
For deeper window pockets
U-value
0.6 W/m²K
Weight
21 kg/m²
Passivhaus
44mmPassivhaus standard
Highest insulation tier
U-value
0.5 W/m²K
Weight
21 kg/m²
U-value timeline
A leap forward, not an incremental step.
Whole-window U-value in W/m²K — lower is better. 24 years of progress at a glance.
Pre-2002
2.7
W/m²K
Old double glazing
2002-2010
1.7
W/m²K
Improved DG
2010-2022
1.4
W/m²K
Modern DG
From 2022
1.2
W/m²K
Current regs
2026
0.5
W/m²K
Regency Triple
60% less heat loss
Versus standard double glazing — feel the difference within days.
Only 5% heavier
Drops into existing window frames. No hinge or hardware stress.
Up to 99% UV reduction
Laminated options protect furniture, floors and fabrics from fading.
Heat pump ready
Low U-values keep generated heat in. Essential for modern heating systems.
Ready to upgrade?
Find out if your windows qualify for the glass-only upgrade.
Free survey · 24-hour quote · no obligation
What we doTwo clear paths to a
Two clear paths to a
warmer, quieter home.
Most Glasgow homes don't need new windows — they need new glass. Glen Glass is one of the only Scottish installers certified to fit Regency Triple straight into your existing frames.
The Glen Glass difference
Glass-only Regency Triple upgrade
Keep your existing window frames. We remove the old double-glazed units and fit Regency Triple straight in. Same thickness, triple the performance, a fraction of the cost of full window replacement.
60%
less heat loss
1 day
install
-50%
vs new windows
Fast
Same-day repairs
Misted units, broken panes, locks. Out the same day across Glasgow.
Warranty
10-year guarantee
Every install backed by a written 10-year workmanship guarantee.
Window Installation
- Bespoke sizing
- A+ rated glazing
- 20+ frame finishes
Learn more
Door Fitting
- PAS24 secure
- Composite & uPVC
- Bi-fold patio doors
Learn more
Conservatories
- 10-year guarantee
- Planning support
- Tiled roof options
Learn more
Emergency Repairs
- Same-day callout
- Emergency boarding
- All glass types
Learn more
Commercial & Public Sector
- Out-of-hours fitting
- Bulk procurement
- Net Zero compliant
Learn more
On site
Glasgow & the central belt
Glasgow trade
Free survey
No obligation, no pushy sales
No obligation
Free survey & quote
About Glen GlassA family trade,
A family trade,
built on word of mouth.
Glen Glass is a small Glasgow glazing firm built on word of mouth. We answer the phone ourselves, we price every job honestly, and most of our work still comes from neighbours of previous customers.
We're small, deliberately. It means when you ring, you speak to someone who knows your job. When we quote, that's the price. And when we leave, your house is cleaner than we found it.
Time-served tradesmen
Every fitter on our team has 10+ years on the tools — no subbed-out apprentices.
Born and raised in Glasgow
We know the closes, the tenements and the bungalows — and how each one needs different glazing.
One job at a time
We never overbook. When we're at your house, you have our full attention until it's done right.
Why Glen Glass
A trade you can actually trust.
We're a small Glasgow team that turns up when we say we will, charges what we quoted, and leaves you with windows that look like they belong there.
In the workshop
Hand-finished frames. Real measurements.
No shortcuts.
No shortcuts.
0+
Years of experience
0+
Projects completed
0yr
Workmanship guarantee
0hr
Emergency response
Our promise to you
Eight things we'll always do — no exceptions.
- Family-run business — you speak to the owner
- No high-pressure sales tactics, ever
- Fixed-price quotes — no hidden extras
- Tidy in, tidy out — dust sheets and clean-up
- Old units removed and recycled responsibly
- 10-year written guarantee with every install
- Same-day emergency callouts across Glasgow
- Up-front honest advice — even if it means no sale
How it worksFrom first call to
From first call to
final clean-up.
A straightforward five-step process. No high-pressure sales, no surprise add-ons, no waiting weeks for callbacks.
1
Get in touch
Call, message or fill the form. We'll reply within 24 hours to book your free survey.
2
Free survey
We pop round, take exact measurements, talk through options and answer all your questions.
3
Fixed-price quote
A clear written quote in your inbox within 24 hours. No fluff, no hidden costs.
4
Install day
Tidy, on time and on budget. We protect floors, remove old units, fit the new — done in a day for most jobs.
5
10-year aftercare
Your guarantee in writing. Anything not right? One call and we're back out.
Step 1
Get in touch
Call, message or fill the form. We'll reply within 24 hours to book your free survey.
Step 2
Free survey
We pop round, take exact measurements, talk through options and answer all your questions.
Step 3
Fixed-price quote
A clear written quote in your inbox within 24 hours. No fluff, no hidden costs.
Step 4
Install day
Tidy, on time and on budget. We protect floors, remove old units, fit the new — done in a day for most jobs.
Step 5
10-year aftercare
Your guarantee in writing. Anything not right? One call and we're back out.
Our workReal installs,
Real installs,
real Glasgow homes.
Every photo is a real job we've completed across the city. Click any to see it full size — and ask us for photos from your own street.
Doors
Glasgow
Navy Composite Door — Mackintosh Glass
Composite · decorative stained glass · multi-point lock
Doors
Glasgow
Brown Composite Door — Diamond Glazing
Composite · diamond decorative inserts · side panel
Doors
Glasgow
White uPVC Door — Lead Glazing
uPVC · lead diamond glazing · frosted side panel
Doors
Glasgow
uPVC Back Door — Six-Pane Glazed
uPVC · 6-pane glazed upper · obscure side light
Doors
Glasgow
White French Doors — Patio Opening
uPVC french doors · full-height glazing · side panel
Windows
West End
Triple Casement — Georgian Bars
uPVC · Georgian bar detail · tilt-and-turn
Windows
Glasgow
Triple Casement — Panoramic Bedroom
uPVC · triple casement · wide-span installation
Windows
Glasgow
Triple Kitchen Window
uPVC · triple pane · flush sill · tilt-and-turn
Windows
Glasgow
Double Casement — Garden View
uPVC · double casement · clear sight lines
Windows
Glasgow
Bathroom Obscure Glass
uPVC · privacy glass · tilt-and-turn opener
Exterior
Glasgow
Full House — Black Composite Door
Composite door · uPVC windows · full house install
Exterior
Glasgow
Full House — Navy Door & White Windows
Composite door · uPVC windows · brick detached
Exterior
Glasgow
Anthracite Extension — Patio & Windows
Anthracite grey · sliding patio door · matching windows
Exterior
Glasgow
Double Casement — Exterior View
uPVC · double casement · render/harling wall
Get a free quote
Or ask us for photos from your postcode.
Where we workAcross Glasgow &
Across Glasgow &
the central belt.
If you're inside the M8 or the M73, we'll be at your door. For the wider central belt we'll travel — same fixed pricing, same guarantee.
Glasgow City
West End
Southside
East End
Bearsden
Bishopbriggs
Milngavie
Paisley
East Kilbride
Hamilton
Motherwell
Cumbernauld
Coatbridge
Newton Mearns
Clydebank
Stirling
Available this week
Same-day quotes across Glasgow
Coverage
Glasgow + central belt
Book a free surveyPick a time.
Pick a time.
We'll do the rest.
Three steps. About 90 seconds. We come out, take measurements, and send you a fixed-price quote within 24 hours. No pressure, no hidden costs.
Call us
07866 367974
WhatsApp
07866 367974
Workshop
Glasgow, G20 · serving the central belt
Hours
Mon–Fri 8am–6pm · Sat 9am–4pm
FENSA RegisteredRegency Certified10-yr Guarantee
Step 1 of 3
What do you need?
Pick the closest match — we'll confirm exact scope on the survey.