Replacement windows
Aluminium, uPVC, flush sash and vertical sliding sash. A-rated and made to measure.
View rangeAluminium & uPVC specialists · East Sussex
Slim frames.Bigger views.
Aluminium and uPVC windows, doors and conservatories, designed and installed across Lewes, Ringmer and East Sussex by the same local team since 1987.
10 year guarantee
Fully insured work
FENSA registered
Installer ID 11644
Aluminium specialists
Trade and domestic
Checkatrade members
Reviewed by customers
Since 1987
Your trusted local glazing experts since 1987
Welcome to Clarks Glass, where craftsmanship and innovation go hand in hand. Our team of skilled professionals approaches every project with dedication, pride, and an unwavering commitment to quality. We specialise in transforming homes and adding value to your property with solutions designed just for you.
Our premium, bespoke products set the industry standard, featuring A-rated replacement windows to help maximise energy efficiency and reduce your energy bills for years to come. For added peace of mind, all our work and products are fully insured and backed by a comprehensive 10-year guarantee.
A-rated as standard
Every replacement window we fit is A-rated, so it keeps working to cut your heating bills long after we have left.
Ten year guarantee
All our work and products are fully insured and backed by a comprehensive ten year guarantee.
FENSA registered
Approved installers, FENSA ID 11644. Your installation is certified and building control compliant.
Made to measure
Bespoke products built to your openings and your property, not pulled off a shelf.
What we install
Everything we make, fit and guarantee
Windows, doors, conservatories and general glazing, plus warm roofs. Aluminium, uPVC and timber alternative, supplied and installed by our own team.
Doors & bifolds
Composite front doors, residential and patio doors, and aluminium bifolding doors.
View rangeConservatories & orangeries
Conservatories, orangeries, warm roofs and Atlas aluminium roof lanterns.
View rangeGeneral glazing
Replacement glass units, self cleaning and decorative glass, and shopfront work.
View rangeDesign it yourself
Build your front door
before you order it
We fit Hallmark composite doors. Their designer lets you put yours together on screen — style, colour inside and out, glass and hardware — and see exactly what it will look like before you speak to anyone.
- Choose your colour
- Pick your glass
- Select the hardware
Ask us about the designer
Free to use · No obligation
Our specialism
Aluminium specialists, commercial and domestic
Clarks Glass are aluminium window and door specialists working across both the commercial and domestic sectors. Whether you are after a set of bifolding doors at home or a full shopfront refurbishment, we have the knowledge and the experience for the project.
Commercial glaziers
Email us your plans directly
If you need a commercial quote based on your project plan, send the drawings over by email and we will do the rest.
Send your plansDomestic replacement glazing
We offer free estimates
Replacement double glazing installations using high quality products including uPVC, aluminium and timber alternative.
See our productsTrade & developers
Trade prices for local builders and developers
Clarks Glass supply trade windows for local builders and DIY projects. Through long standing partnerships with local manufacturers we hold genuinely competitive trade discounts, and our range covers most building projects and extensions.
- Competitive trade discounts through local manufacturer partnerships
- A product range that covers extensions, new build and refurbishment
- Commercial quotes prepared straight from your project plans by email
- Supply only or supply and fit, whichever suits the job
What customers say
Reviewed by the people we have worked for
We are proud members of Checkatrade. Here are a few comments from recent customers.
Clarks Glass were extremely helpful in developing the unusual design for this conservatory (built at high level base) and did a great job with the build to get a fine result at an excellent price.
We are very pleased with the excellent work carried out by the fitter and staff of Clarks Glass who have given our home a brand new look again they have made all the difference, well done.
I am amazed with the transformation, all staff at Clarks Glass worked hard throughout the 2 days, always kept the house clean, I would definitely recommend to anyone.
From initial contact through design, survey procurement and installation the whole process was done in a professional and efficient manner. Clarks Glass is a great company to deal with.
Products we supply and install
Where we work
Covering Lewes, Ringmer and across East Sussex
We work from our base at Ringmer Business Centre. If your town is not listed, call us anyway, we very likely cover it.
Based at Ringmer Business Centre
- Lewes
- Ringmer
- Barcombe
- Brighton
- Hove
- Seaford
- Eastbourne
- Polegate
- Hailsham
- Uckfield
- Heathfield
- Crowborough
- Wadhurst
- Ditchling
- Plumpton
- Chailey
- Haywards Heath
- Burgess Hill
- Glynde
- Halland
- Horam
- Laughton
- Framfield
- East Hoathly
- Chiddingly
- Wivelsfield
Free, no obligation
Tell us what you need and we will price it up
Send us a few details and one of the team will be in touch within a working day. Free survey, free estimate, no pressure and no obligation.
Every installation is covered by our ten year guarantee and fully insured.