Insulated Glazed Units
Made to Measure and Replacement Double and Triple Glazed Sealed Units
Specialists in all types of sealed glazed units for uPVC, Timber and Aluminium framed Windows, Doors and Conservatories
Double glazed units are made from two pieces of top quality glass, cut to the required size and sealed around an internal frame called the spacer bar.
We know that your windows come in all shapes and sizes, that’s why our glass does too. With a choice of innovative glass types from standard float to solar control, thermal and acoustic units we are always on hand to help you decide on the best option for your property and budget. Care is always taken to match the original glass when replacing any existing units that may appear foggy, misted, blown or broken.
Our complete service offering includes:
- Advice and assistance from our knowledgeable team over the phone or a site visit to your premises if required
- Help with how to measure the height, width and depth of your units correctly
- Help you make an informed choice for either air or gas filled units
- How to identify your current glass type
- Removal and disposal of the old units (this may incur a service charge)
- Installation of new glazing panels
- Supply only on all our products is also an option
All our branches are approved Planitherm Network Members.
We are a FENSA registered company. You can find your nearest window installer HERE.
Replacement Double Glazed Units
Often the frames the surround your glass are still serviceable but the glass unit itself may have clouded or misted over time. An affordable solution to this may be a replacement glass unit.
By replacing faulty units and repairing locks and hinges your home can be kept secure and weather proof.
Which Glass?
● Energy Efficiency ● Enhanced Security ● Noise Reduction ● Furniture Fade Protection ● Reduce Overheating
We can advise, supply and install the latest in glass innovation options:
Basic Double Glazed Unit (DGU)
Laminated
Solar Control
Thermal Insulated
Acoustic
Easy Clean
Tinted
Traditional and Contemporary Decorative Glass
Heritage Double Glazed Units
Slimline sealed units that provide a sympathetic upgrade/solution for some traditional single glazing in listed and conservation area properties. These units are designed to fit traditional timber frame windows.
For more information on our Westcountry Heritage units range please click HERE
Window and Door Repairs
Supply and installation of replacement glass, hinges, handles and locks to keep your windows and doors in tip top condition.
Secondary Glazing
Bespoke, discreer, slimline and secure glazing designed for all building types including: listed, conservation area and heritage properties.
We offer a wide range of solutions produced especially for Secondary Glazing.
● Effective Sound Insulation ● Significantly Reduced Heat Loss ● Retain the Property Character ● Full Installation Service ● Various Style Options
There is even an effective, affordable easy fix DIY option
You can find out more about our Secondary Glazing solutions HERE

Cat and Dog Flaps In Glass Units
We supply and fit Cat and Dog flaps into double glazed units in doors and windows and single glazed doors and windows.
Dog and Cat Flaps can be fitted to the following:
- Glass Doors
- Conservatories
- Windows
- Double/Single Glazed Units
- Sliding Patio Doors
- French Doors
- Double Glazing
- Single Glazing
- Single, Flat Panel uPVC Doors
More information and Q & A’s for all your Pet Door requirements can be found HERE

Decorative Glass Units
Bespoke commissions for styles ranging from traditional to contemporary. Each design produced or repaired can, if required, be fitted into a double glazed unit giving you desired aesthetics within a secured unit.
We pride ourselves on the work that we undertake, be it a simple repair or a complex and intricate leaded light.
More information on Stained Glass and Colour Film designs can be found HERE

Please do not hesitate to get in touch if you have any question about our double glazed units. All our branch details are listed below.
Glazing Units Gallery
- Windows and Conservatories
- Bay Window
- Leaded Glass Window
- Decorative Window
- New Build Window
- Window Wall
- Heartlands Cornwall
- Casement Window
- Flush Sash
- Sash Horn Window
- Commercial Glazing
- Traditional Style Window
- Extention & Windows
- Conservatory
- Cat flap in glass door
FAQ’s
Important Notice:
The information provided in our FAQ section is intended as a general guide only. For detailed and specific enquiries, we strongly recommend contacting your local Cornwall Glass branch. Our team will be happy to assist you with accurate and personalised information.
Yes, we provide energy-efficient glazing options to help reduce energy bills and improve insulation.
Yes, we have a range of decorative glass options available, including stained glass and patterned glass.
Yes, we provide sandblasting for decorative and privacy purposes.
Yes, we provide heat-strengthened glass for various applications.
Yes, we provide acoustic glass for sound insulation.
Yes, we provide fire-resistant glass for safety applications.
Yes, we provide glazing solutions for heritage and listed buildings.
Yes, we provide glass for boats and marine environments.
Yes, we provide glass for various automotive needs.
Yes, we offer glass solutions for sports and recreational facilities.
Yes, we offer glazing specifically designed for greenhouses.
Yes, we provide glazing solutions for skylights and roof windows.
Yes, we design and install custom glass shower screens.
Yes, we can incorporate pet flaps into glass doors and windows.
Yes, we offer custom stained glass designs.
Yes, we offer secondary glazing solutions for improved insulation.
Yes, we design and install glass for commercial shop fronts.
Yes, we offer walk-on glass solutions for floors and roofs.
Yes, we provide glass for solar panel applications.
Yes, we offer custom glass solutions for aquariums.
Yes, we offer glass solutions for sports and recreational facilities.
Yes, we offer custom glass solutions for artistic projects.
Yes, we offer glass solutions for residential properties.
Yes, we provide both supply-only and supply-and-installation services.
Lead times vary depending on the project; please contact us for specific details.
Yes, we offer glazing solutions for conservatories, including double and triple glazed units.
Yes, we provide glazing for various types of doors, including uPVC, timber, and aluminium.
Yes, we offer glass replacement services for broken or damaged windows and doors.
Contact us with your requirements, and we will guide you through the process from measurement to installation.
Yes, we provide energy-efficient glazing options to help reduce energy bills and improve insulation.
Yes, we offer glazing solutions for both residential and commercial properties.
Yes, we have a range of decorative glass options available, including stained glass and patterned glass.
We strive to use sustainable practices and materials in our glazing products.
Yes, we provide glazing solutions for heritage and listed buildings.
Yes, we offer glazing specifically designed for greenhouses.
Yes, we provide glazing solutions for skylights and roof windows.
Yes, we design and install custom glass shower screens.
We recommend using a non-abrasive glass cleaner and a soft cloth to keep your windows clean and clear. We sell our own branded non-abrasive cleaner.
Yes, we can incorporate pet flaps into glass doors and windows.
Yes, we offer custom stained glass designs.
Yes, we offer secondary glazing solutions for improved insulation.
Warranty details vary by product; please contact us for specific information.
Yes, we provide sandblasting for decorative and privacy purposes.
Yes, we offer custom bevelled glass options.
Yes, we design and install glass for commercial shop fronts.
Yes, we offer custom glass shelving solutions.
Yes, we provide heat-strengthened glass for various applications.
Yes, we design and install custom glass doors.
Yes, we provide acoustic glass for sound insulation.
Yes, we offer custom glass partitions for offices and homes.
Yes, we offer walk-on glass solutions for floors and roofs.
Yes, we provide custom tinted glass options.
Yes, we provide fire-resistant glass for safety applications.
Yes, we offer bespoke glass countertops for kitchens and bathrooms.
Yes, we design and install glass for skylights.
Yes, we offer custom glass solutions for artistic projects.
Yes, we provide glass for boats and marine environments.
Yes, we offer custom frosted glass options.
Yes, we offer glass solutions for heritage and listed buildings.
Yes, we provide glass for solar panel applications.
Yes, we provide glass for various automotive needs.
Yes, we offer custom glass solutions for aquariums.
Yes, we offer glass solutions for sports and recreational facilities.
We offer a wide range of glazing services, including double glazing, triple glazing, secondary glazing, single pane glazing, and bespoke glass solutions.
Double glazing consists of two panes of glass with a spacer bar in between, providing better insulation and noise reduction.
Triple glazing includes three panes of glass, offering even greater insulation and energy efficiency compared to double glazing.
The cavity refers to the space between the two panes of glass in a double-glazed window. This space is typically filled with air or an inert gas (like argon or krypton) to improve insulation and reduce heat transfer.
- Typical cavity width: 6mm to 20mm (most standard Double and Triple Glazed Units have either 20mm or 16mm)
- Purpose: Enhances thermal and acoustic insulation
The overall thickness is the total depth of the entire unit, including:
- The first pane of glass
- The cavity
- The second pane of glass
For example, a unit described as 4/16/4 means:
- 4mm glass + 16mm cavity + 4mm glass = 24mm overall thickness
For example, a unit described as 4/16/4/16/4 means:
- 4mm glass + 16mm cavity + 4mm glass + 16mm cavity + 4mm glass = 44mm overall thickness
Double glazing improves energy efficiency, reduces noise, and enhances security.
Triple glazing provides superior insulation, noise reduction, and energy savings.
Yes, we can replace misted or blown double glazed units to restore clarity and insulation.
We offer a variety of glass types, including laminated glass, toughened glass, solar control glass, thermal insulated glass, acoustic glass, and decorative glass.
Yes, we offer bespoke glass solutions tailored to your specific needs.
01872 276697
Truro@cornwallglass.co.uk
Chyvelah Road, Threemilestone, Truro, TR3 6AZ
01326 375124
Penryn@cornwallglass.co.uk
Commercial Road, Penryn, TR10 8AQ
01736 360174
Penzance@cornwallglass.co.uk
Poniou Way, Longrock Industrial Estate, Penzance, TR20 8HX
01726 874564
StAustellGlazing@cornwallglass.co.uk Stennack Road, St Austell, PL25 3JQ
01752 605500
PlymouthTC@cornwallglass.co.uk
3 Beechwood Way, Langage, Plymouth, PL7 5HH
01392 364364
Exeter@cornwallglass.co.uk
7-10 Bittern Units, Bittern Road, Sowton Industrial Estate, Exeter, EX2 7LW
01935 412300
Yeovil@cornwallglass.co.uk
22 Garrett Road, Lynx Trading Estate, Yeovil, BA20 2TJ
0117 9710101
Bristol@cornwallglass.co.uk
Units 1-3, 306 Broomhill Road, Brislington, Bristol, BS4 5RG





























