house extensions cost

Glass Extensions

Create a space you love to come home to with our stunning made
to measure products including windows, doors, extensions & much more.

November Offer: 30% off + Free Upgrade to Colour Grained Frames*

Coral Windows & Conservatories – Promotional Terms & Conditions 1st November 2026 – 30th November 2026
November 2026 Sale
* Discounts applicable to uPVC products manufactured by Coral only. *
* Discounts apply to the geographical area covered by ITV Yorkshire TV Broadcasts. Out of these geographical areas, discounts may vary. *
* Discounts do not apply to any contract which is subject to Building Regulations. *
* Our CL3 Range and other triple-glazed windows are subject to size restrictions and style limitations due to the weight of the glass – see your representative for
details. The maximum size for any triple glazed glass unit is 1.7m2

due to health & safety reasons. Where the customer requires a larger unit size, an energy-
efficient double-glazed unit will be supplied and installed. *

* Any offer taken must be stated in writing on the contract at the point of sale. Code NOV26 must also be clearly marked on any contract to qualify for these
offers. Coral cannot be held responsible for claims placed after this time. *
November 2026 Free Colour Upgrade on Selected Frames Offer Terms and Conditions:
1. The “Free Colour Upgrade on Selected Frames” is available on qualifying orders placed between 01.11.2026 & 30.11.2026.
2. “Free Colour Upgrade on Selected Frames Offer” must be stated in writing on the contract at the point of sale. Coral cannot be held responsible for
claims placed after this time.
3. The “Free Colour Upgrade on Selected Frames” applies to any standard double-glazed tilt & turn windows or French doors, manufactured by Coral
only, with frame colour being either Yakisugu foil on both sides, Honey Oak on Both sides, Yakisugu foil outside and smooth white (i.e. not grained)
uPVC inside or Honey Oak foil outside and smooth white (i.e. not grained) uPVC inside.
4. The “Free Colour Upgrade on Selected Frames” can be applied to conservatory frames providing they are standard double-glazed tilt & turn windows
or French doors, manufactured by Coral only, with frame colour being either Yakisugu foil on both sides, Honey Oak on Both sides, Yakisugu foil
outside and smooth white (i.e. not grained) uPVC inside or Honey Oak foil outside and smooth white (i.e. not grained) uPVC inside.
5. The “Free Colour Upgrade on Selected Frames” does not apply to uPVC flush casement windows, CL3 range or any other triple-glazed windows, uPVC
residential doors, composite doors, inline patio doors, aluminium bi-folding doors, conservatory roofs or Vertical Sliding Sash windows.
6. The “Free Colour Upgrade on Selected Frames” offer does not apply to any building works, internal sills, window boards or trims.
7. There is no minimum order value to qualify for the “Free Colour Upgrade on Selected Frames”.
November 2026 30% Off Selected Items Offer Terms and Conditions:
1. The “30% Off Selected Items Offer” is available on qualifying orders placed between 01.11.26 & 30.11.26.
2. The “30% Off Selected Items Offer” is available on standard casement windows, flush sash windows, uPVC tilt & turn windows, uPVC residential
doors, Composite doors, and uPVC French doors.
3. “30% Off Selected Items Offer” must be stated in writing on the contract at the point of sale. Coral cannot be held responsible for claims placed after
this time.
4. The “30% Off Selected Items Offer” can be applied to conservatory frames providing they are not included in the listed exclusions below.
5. The “30% Off Selected Items Offer” does not apply to aluminium bi-folding doors, conservatory roofs or Vertical Sliding Sash windows.
6. The “30% Off Selected Items Offer” offer does not apply to any building works, internal sills, window boards or trims.
7. The “30% Off Selected Items Offer” cannot be used in conjunction with the “November 2026 Free Colour Upgrade offer”.
8. There is no minimum order value to qualify for the “30% Off Selected Items Offer”.
Free Conservatory Roof Glass Upgrade Terms and Conditions:
1. The “Free Conservatory Roof Glass Upgrade offer” is available on qualifying orders placed between 01.11.2026 & 30.11.2026.
2. “Free Conservatory Roof Glass Upgrade offer” must be stated in writing on the contract at point of sale. Coral cannot be held responsible for claims
placed after this time.
3. The “Free Conservatory Roof Glass Upgrade offer” can only be applied to orders containing Coral Premium Roofs.
4. The “Free Conservatory Roof Glass Upgrade offer” can be applied to the following: –
 Ambi-Blue Self-Cleaning (1.2 uValue) can be upgraded to Ambi-Sunshade Blue Self-Cleaning (1.0 or 1.2 uValue).
 Ambi-Blue Self-Cleaning (2.7 uValue) can be upgraded to Ambi-Sunshade Blue Self-Cleaning (2.7 uValue).
 Ambi-Neutral Self-Cleaning (1.2 uValue) can be upgraded to Ambi-Aqua Self-Cleaning (1.0 or 1.2 uValue).
 Ambi-Neutral Self-Cleaning (2.7 uValue) can be upgraded to Ambi-Aqua Self-Cleaning (2.7 uValue).
 Ambi-Blue Self-Cleaning or Ambi-Neutral Self-Cleaning (1.2 uValue) can be upgraded to Ambi-Ultra Self-Cleaning (1.0 or 1.2 uValue).

Terms and Conditions

November 2026 Free Colour Upgrade on Selected Frames Offer Terms and Conditions:
1. The “Free Colour Upgrade on Selected Frames” is available on qualifying orders placed between 01.11.2026 & 30.11.2026.
2. “Free Colour Upgrade on Selected Frames Offer” must be stated in writing on the contract at the point of sale. Coral cannot be held responsible for
claims placed after this time.
3. The “Free Colour Upgrade on Selected Frames” applies to any standard double-glazed tilt & turn windows or French doors, manufactured by Coral
only, with frame colour being either Yakisugu foil on both sides, Honey Oak on Both sides, Yakisugu foil outside and smooth white (i.e. not grained)
uPVC inside or Honey Oak foil outside and smooth white (i.e. not grained) uPVC inside.
4. The “Free Colour Upgrade on Selected Frames” can be applied to conservatory frames providing they are standard double-glazed tilt & turn windows
or French doors, manufactured by Coral only, with frame colour being either Yakisugu foil on both sides, Honey Oak on Both sides, Yakisugu foil
outside and smooth white (i.e. not grained) uPVC inside or Honey Oak foil outside and smooth white (i.e. not grained) uPVC inside.
5. The “Free Colour Upgrade on Selected Frames” does not apply to uPVC flush casement windows, CL3 range or any other triple-glazed windows, uPVC
residential doors, composite doors, inline patio doors, aluminium bi-folding doors, conservatory roofs or Vertical Sliding Sash windows.
6. The “Free Colour Upgrade on Selected Frames” offer does not apply to any building works, internal sills, window boards or trims.
7. There is no minimum order value to qualify for the “Free Colour Upgrade on Selected Frames”.
November 2026 30% Off Selected Items Offer Terms and Conditions:
1. The “30% Off Selected Items Offer” is available on qualifying orders placed between 01.11.26 & 30.11.26.
2. The “30% Off Selected Items Offer” is available on standard casement windows, flush sash windows, uPVC tilt & turn windows, uPVC residential
doors, Composite doors, and uPVC French doors.
3. “30% Off Selected Items Offer” must be stated in writing on the contract at the point of sale. Coral cannot be held responsible for claims placed after
this time.
4. The “30% Off Selected Items Offer” can be applied to conservatory frames providing they are not included in the listed exclusions below.
5. The “30% Off Selected Items Offer” does not apply to aluminium bi-folding doors, conservatory roofs or Vertical Sliding Sash windows.
6. The “30% Off Selected Items Offer” offer does not apply to any building works, internal sills, window boards or trims.
7. The “30% Off Selected Items Offer” cannot be used in conjunction with the “November 2026 Free Colour Upgrade offer”.
8. There is no minimum order value to qualify for the “30% Off Selected Items Offer”.
Free Conservatory Roof Glass Upgrade Terms and Conditions:
1. The “Free Conservatory Roof Glass Upgrade offer” is available on qualifying orders placed between 01.11.2026 & 30.11.2026.
2. “Free Conservatory Roof Glass Upgrade offer” must be stated in writing on the contract at point of sale. Coral cannot be held responsible for claims
placed after this time.
3. The “Free Conservatory Roof Glass Upgrade offer” can only be applied to orders containing Coral Premium Roofs.
4. The “Free Conservatory Roof Glass Upgrade offer” can be applied to the following: –
 Ambi-Blue Self-Cleaning (1.2 uValue) can be upgraded to Ambi-Sunshade Blue Self-Cleaning (1.0 or 1.2 uValue).
 Ambi-Blue Self-Cleaning (2.7 uValue) can be upgraded to Ambi-Sunshade Blue Self-Cleaning (2.7 uValue).
 Ambi-Neutral Self-Cleaning (1.2 uValue) can be upgraded to Ambi-Aqua Self-Cleaning (1.0 or 1.2 uValue).
 Ambi-Neutral Self-Cleaning (2.7 uValue) can be upgraded to Ambi-Aqua Self-Cleaning (2.7 uValue).
 Ambi-Blue Self-Cleaning or Ambi-Neutral Self-Cleaning (1.2 uValue) can be upgraded to Ambi-Ultra Self-Cleaning (1.0 or 1.2 uValue).

Lowest Price Guarantee terms and conditions:
Our price promise has held Coral in good stead with our customers for over 35 years. We will not be beaten on price (please refer to terms and conditions below
for further details when comparing to other quotes from other companies), they must have:
1. The specification of the product must be fully sculptured 70mm profile.
2. The styles and sizes must be detailed on a letter headed quotation.
3. Conservatory frames – windows and doors should be of the same quantity, styles and design specification.
4. Conservatory roofs – must be of same design specification. “Tiled” conservatory roofs must be Ultraroof.
5. Warranties for each of the products must either be the same of better.
6. Have an Insurance Backed Guarantee (where work is covered by FENSA).
7. Have a BSI kitemark for survey and installation.
8. Be FENSA regulated.
9. Manufacture their own products.

It is important to bear in mind that Coral Windows and Conservatories have been in business with continuous trading for over 35 years and we do not take a
deposit or stage payments and only ask for payment when the goods are installed. This gives you, our customers 100% peace of mind.
Our CL3 Triple Glazed Range and other triple glazed windows are subject to size restrictions and style limitations due to the weight of the glass – see your
representative for details. The maximum size for any triple glazed glass unit is 1.7m2

due to health & safety reasons. Where a required unit size is larger, an A-
rated double-glazed unit will be supplied and installed.

“Self-cleaning” glass is not a ‘100% maintenance-free’ product but does offer a reduced need for manual cleaning.

*New windows from Coral could save our customers hundreds of pounds on their heating bills*
You can check both your potential savings on heating costs and your CO2 savings by entering a few simple details into our energy calculator which can be found
on our website https://www.coralwindows.co.uk
As an example, a typical customer (living in a semi-detached house which has wooden single glazed windows and mains gas heating) could save approx. £911 on
their heating bill over the course of the first 12 months after they had new double-glazed windows installed by Coral Windows (information correct as at
13/10/2023). Potential savings will vary depending on the information entered into the energy calculator.

How to Get Started:

At Coral Windows and Conservatories, we pride ourselves on delivering exceptional products and services. By recommending us, you’re helping your friends and family improve their homes while enjoying our top-tier offerings.

Thank you for being a valued member of the Coral Windows family. Your continued support and recommendations mean the world to us. Let’s build a brighter future together, one recommendation at a time!

Refer Now!
our process

Fill Out the Referral Form

Provide us with the details of your friend, relative, or neighbour.
our process pencil ruler

Submit the Form

Send it to us, and we will take care of the rest!
our process map

Wait for Your Reward

Once the referred person makes their purchase, has their order installed, and pays us, we will send your reward directly to you.

Elevate Your Home with Stunning Living Spaces by Coral

Create a space you love to come home to with our stunning made to measure products including windows, doors, extensions & much more.

Triple glazing window

Thermal Efficiency

Our glass extensions are double glazed as standard and provide exceptional thermal efficiency, allowing your new glass extension to stay cool in summer and warm in winter!

Hand opening a white frame window

Weatherproofing

No need to worry about adverse weather or water ingress, as we employ the latest in weatherproofing technology to ensure your new extension keeps the weather out.

Green frame double glazing

Home Security

Better to have it and not need it, we use high security locking mechanisms on all our extensions so you can have total peace of mind.

Frequently asked question

What is a glass extension?

A glass extension is a light-filled addition to your home that uses large glazed panels, and often a glass roof, to create a bright, open living space. It’s a popular way to add room and connect your home to the garden without the need to move.

What are the benefits of a glass extension?

Can a glass extension be used all year round?

Where does Coral Windows install glass extensions?

Stay in touch

Enter your email address to receive updates on our latest collections, trends and exclusive offers.

Ready to start your project?

Get A Quote

Or chat with our experts?

Sales enquiries

General enquiries

Aftercare enquiries

SmartFrame enquires

© 2026 Coral Windows All rights reserved

Company Reg Number: 2562447

Made by ICAAL