Flat Glass Rooflights for Flat Roofs

Our Flat Glass

Browse our Flat Glass range for premium, versatile glass solutions, perfect for any project. Enjoy superior clarity, durability, and design flexibility that enhances the aesthetics and functionality of your space with ease.

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Brett Martin Flat Glass 150mm uPVC Kerb, Fixed Opening

Price From:
£676.62 Ex VAT
£811.94 inc VAT
Estimated Delivery:
48 hours
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Brett Martin Flat Glass 150mm uPVC Kerb, Manual Opening

Price From:
£624.60 Ex VAT
£749.52 inc VAT
Estimated Delivery:
5 Working Days
Select options This product has multiple variants. The options may be chosen on the product page
Brett Martin Flat Glass 300mm uPVC Kerb, Fixed Opening

Price From:
£611.36 Ex VAT
£733.63 inc VAT
Estimated Delivery:
48 Hours
Select options This product has multiple variants. The options may be chosen on the product page
Brett Martin Flat Glass 300mm uPVC Kerb, Manual Opening

Price From:
£672.10 Ex VAT
£806.52 inc VAT
Estimated Delivery:
5 Working Days
Select options This product has multiple variants. The options may be chosen on the product page
Brett Martin Flat Glass Fixed Opening

Price From:
£445.47 Ex VAT
£534.56 inc VAT
Estimated Delivery:
48 Hours
Select options This product has multiple variants. The options may be chosen on the product page
Brett Martin Flat Glass, Manual Opening

Price From:
£599.68 Ex VAT
£719.62 inc VAT
Estimated Delivery:
5 Working Days
Select options This product has multiple variants. The options may be chosen on the product page
Flat Glass Rooflight

Price From:
£353.75 Ex VAT
£424.50 inc VAT
Estimated Delivery:
10/15 Working Days
Select options This product has multiple variants. The options may be chosen on the product page
Horizon EDGE Air Flat Rooflight

Price From:
£1,194.00 Ex VAT
£1,432.80 inc VAT
Select options This product has multiple variants. The options may be chosen on the product page
Horizon Edge Flat Rooflight

Price From:
£566.67 Ex VAT
£680.00 inc VAT
Select options This product has multiple variants. The options may be chosen on the product page
Horizon Edge Multipane

Price From:
£1,089.60 Ex VAT
£1,307.52 inc VAT
Select options This product has multiple variants. The options may be chosen on the product page
Horizon Edge Walk On

Price From:
£1,796.40 Ex VAT
£2,155.68 inc VAT
Select options This product has multiple variants. The options may be chosen on the product page
Korniche Flat Glass

Price From:
£379.74 Ex VAT
£455.69 inc VAT
Select options This product has multiple variants. The options may be chosen on the product page

Horizon Windows & Doors

5.0

Based on 20 reviews

review us on

Romica Visan

12:02 17 Oct 25

Guy Maddison

10:35 09 Oct 25

Purchased new windows for a job we are doing for a customer in Portsmouth. These guys are great. Very responsive and know what they are talking about. They also keep up with building regulations to make sure everything they supply meets the standard. Thanks!!!!

Danny

10:21 09 Oct 25

Bought a set of bifolds very swift with delivery and good quality product. Thanks

daniel clark

13:03 15 Jul 25

Bought a bifold door and two windows
Great price and swift delivery!
Thanks.

Steve Winterberg

18:52 29 Jun 25

I have been using Horizon windows and doors on our properties and those of customers for over 10 years now and never ever had anything other than 1st class service and quality - light tunnels, roof lights, french and sliding doors, windows in plain, woodgrain and painted finishes and the replacement of blown sealed units originally fitted by others. Thoroughly recommend! Great company with 1st class professional staff.

jason knight

17:42 19 Jun 25

Bought a set of bifolds for new extension. Great guidance and friendly service from josh and his team. Product arrived on time and excellent quality. Very pleased and warm friendly family run business

Dan Ette

19:02 18 Jun 25

Great service

Imogen Farrell

17:55 18 Jun 25

Great experience! Ordered bifold doors and a roof lantern, everything arrived on time and looks amazing. Good prices, helpful support, and solid quality. Would definitely use them again.

Nicola Lilley

08:13 15 Jun 25

Great service- Window was installed quickly and promptly. Thanks so much. Would recommend!

Robert Belcher

15:46 14 Jun 25

Supplied and fitted a set of bi-fold doors in our new extension. Good workmanship and took away all waste afterwards. The doors look great and its really finished off our new patio area. Thumbs up ?

John Varndell

18:22 08 Apr 25

James Black

10:43 26 Mar 25

I used horizon windows & doors to carry out some work on our extention.. the quality of work and service received was excellent... highly recommend...

Vincent Dunne

21:03 20 Mar 25

We recently had bifold doors and windows installed and we couldn’t be happier with the results! From start to finish, their team was professional, knowledgeable, and incredibly helpful.

The quality of the doors and windows is outstanding and clearly built to last. The installation process was smooth and efficient, with great attention to detail. They kept us informed throughout, ensuring everything was perfect. Highly recommend to anyone looking!

Steven Wight

20:51 19 Mar 25

I used horizon for windows for my extension, we had a great service from start to finish we are using them again later in the year to replace the existing house windows after seeing the quality of the ones for our extension, super pleased with them.

Emine Holden

20:45 19 Mar 25

I purchased five windows for my home, and the experience was seamless. The team was professional, efficient, and very helpful throughout the process. Highly satisfied with their service!