Transform your home with premium double glazing from Sunderland's trusted window fitters. Energy-efficient replacement windows and doors installed by local experts with over 25 years experience.
As one of Sunderland's leading double glazing companies, Range Windows has been transforming homes across Tyne and Wear for over 25 years. Our expert window fitters deliver quality installations that last.
Complete Double Glazing Solutions
From uPVC double glazing windows and composite doors to bi-folding doors and conservatories, we supply and fit the complete range of double glazed products for your home.
Sunderland's Trusted Window Company
We're proud to be Assure Certified Installers, giving you confidence in our workmanship and the quality of our double glazing installations throughout the North East.
Free, No-Obligation Quotes
Get a free survey and quote for your double glazing project. Our friendly team will visit your home, discuss your requirements, and provide transparent pricing with no pressure.
Explore our complete range of double glazed windows and doors
Energy-efficient double glazed windows in a range of styles and colours.
Secure, insulated front doors that make a lasting impression.
Elegant patio doors for seamless indoor-outdoor living.
Open up your home with stunning wide-opening bifold doors.
Space-saving sliding doors with panoramic views.
Bespoke conservatories to extend your living space.
Double glazing consists of two panes of toughened glass separated by an insulating gas-filled cavity — typically argon — held in a thermally broken frame. This construction dramatically reduces heat transfer compared to single glazing, keeping warmth inside during Sunderland's cold North East winters and cutting your heating bills throughout the year.
For a typical Sunderland semi-detached or terraced property, upgrading from single glazing to A-rated double glazing can reduce window-related heat loss by up to 70%. Modern double glazed units carry a U-value as low as 1.2 W/m²K — compared to around 5.0 W/m²K for older single-glazed windows. Most homeowners across Tyne and Wear notice the difference on their heating bills within the first winter.
Beyond energy savings, today's double glazing offers meaningful acoustic insulation — noticeably reducing road noise and neighbourhood sound — along with enhanced security through multi-point locking systems and toughened or laminated glass options. At Range Windows, we supply and install double glazing in uPVC, aluminium, and wood-effect frames to suit every property type and budget. All our windows carry an A or A+ Window Energy Rating and are installed to Building Regulations standards.
From your first contact with us to the final clean-up, we make your double glazing installation straightforward and stress-free.
Free home survey
One of our local surveyors visits your property, measures every window and door, discusses frame styles and colours, and answers any questions — with no obligation to proceed.
Written quotation
You receive a detailed, itemised quote with no hidden costs. We don't use high-pressure sales tactics or limited-time offers.
Manufacturing and scheduling
Your windows are manufactured to your exact measurements, typically ready within 3–4 weeks. We'll confirm your installation date in advance.
Professional installation
Our trained fitters remove your old windows and install your new double glazing cleanly and efficiently. Most domestic installations in Sunderland complete within one to two days.
Inspection and guarantee
We carry out a full inspection with you before we leave. Your 10-year product and workmanship guarantee starts from installation day, and you receive your Building Regulations compliance certificate.
Common questions from homeowners across Sunderland and Tyne and Wear.
Costs vary depending on the number of windows, frame material, glass specification, and any door installations. As a guide, a standard casement window starts from around £300–£500 supplied and fitted. We provide free, itemised quotes with no obligation and no pressure to proceed. Contact us to arrange your free home survey.
Most homes in Sunderland can be fully double glazed in one to two days. A typical three-bedroom semi-detached with eight to ten windows and a door is usually completed within a single day by our installation team.
In most cases, no. Replacing windows in a like-for-like style is considered permitted development for standard residential properties. Listed buildings and some conservation areas in Sunderland have additional requirements — our team will advise you during your free survey.
Energy Saving Trust estimates that replacing single glazing with A-rated double glazing can save a typical semi-detached home between £110 and £155 per year on energy bills. Savings vary by property size, existing insulation, and heating habits, but most homeowners across Tyne and Wear notice the difference within their first winter.
Window Energy Ratings (WER) run from G to A++. An A-rated window has a U-value of 1.4 W/m²K or better and performs well in both heat retention and solar gain. A C-rated window meets building regulations minimum but retains noticeably less heat. We recommend A-rated as standard — it's what we install as default on every job.
Quality double glazed units typically last 20–25 years before the sealed gas cavity begins to fail and condensation appears between the panes. Frames generally last 30 or more years with minimal maintenance. All our installations carry a 10-year guarantee on products and workmanship.
Yes — if your frames are in good condition, we can replace failed sealed units without replacing the entire frame. Our team will assess your existing frames during the free survey and recommend the most cost-effective solution.
Yes. Range Windows is registered with Assure, a government-authorised competent persons scheme for window and door installation. Every installation is self-certified to Building Regulations standards, and you receive a certificate of compliance — which is required when you sell your home.
Contact Sunderland's trusted window fitters today for a free, no-obligation quote.
Get Your Free Quote135+ reviews on Google
Lisa Young
4 months ago
Fantastic experience with Lee from Range Windows. Prompt efficient service, windows swiftly measured up and date of installation agreed. Call on the day of installation to confirm the time and Lee arrived as agreed. Fab installation and exceptionally happy with the product. Will definitely recommend.
Keira Hunter
This week
Had a new door fitted by Range Windows and Doors today, door looks amazing and service was brilliant. Everything was all cleaned up after the job was finished too which was a bonus. Highly recommended.
Taryn Cotton
This week
Definitely recommend this company! Service is 5 star, they try to help any way they can. Fitting me in to fit a low profile door so my wheelchair could get in my new home. The door is easy to work, draft free and feels very secure and solid. A very caring genuine company which is hard to find nowadays.
Deborah Younger Martin
A month ago
Excellent service, friendly, helpful, arrived when they said they would, and cleaned up after themselves. Can't recommend enough.
Stephen Raine
A month ago
Adam and Brad came early, on time and got to work straight away. They worked hard, fitting 3 new bedroom windows then a back door — all finished in the day. Every item was installed well. They cleaned up everything inside and out, taking all rubbish away with them. Thank you for your good work.
Sye
2 months ago
Within a day Adam came to the house for a free quote — no pressure, no rush. Very professional and we chose this company just from how Adam represented them. Lee measured everything up within days, giving honest advice where other companies were saying to replace everything. Outstanding service.
Jessica Campbell
2 months ago
I couldn't recommend these guys enough! Service was spot on start to finish. Lee and the guys are so knowledgeable about their products, even dropping off brochures so I could make a decision in my own time. No pressured sales, just down to earth people. Adam and Brad fitted the door — so professional.
Aaron Harfield
A month ago
Amazing job, could not ask for more from Lee and Adam.
Lisa Young
4 months ago
Fantastic experience with Lee from Range Windows. Prompt efficient service, windows swiftly measured up and date of installation agreed. Call on the day of installation to confirm the time and Lee arrived as agreed. Fab installation and exceptionally happy with the product. Will definitely recommend.
Keira Hunter
This week
Had a new door fitted by Range Windows and Doors today, door looks amazing and service was brilliant. Everything was all cleaned up after the job was finished too which was a bonus. Highly recommended.
Taryn Cotton
This week
Definitely recommend this company! Service is 5 star, they try to help any way they can. Fitting me in to fit a low profile door so my wheelchair could get in my new home. The door is easy to work, draft free and feels very secure and solid. A very caring genuine company which is hard to find nowadays.
Deborah Younger Martin
A month ago
Excellent service, friendly, helpful, arrived when they said they would, and cleaned up after themselves. Can't recommend enough.
Stephen Raine
A month ago
Adam and Brad came early, on time and got to work straight away. They worked hard, fitting 3 new bedroom windows then a back door — all finished in the day. Every item was installed well. They cleaned up everything inside and out, taking all rubbish away with them. Thank you for your good work.
Sye
2 months ago
Within a day Adam came to the house for a free quote — no pressure, no rush. Very professional and we chose this company just from how Adam represented them. Lee measured everything up within days, giving honest advice where other companies were saying to replace everything. Outstanding service.
Jessica Campbell
2 months ago
I couldn't recommend these guys enough! Service was spot on start to finish. Lee and the guys are so knowledgeable about their products, even dropping off brochures so I could make a decision in my own time. No pressured sales, just down to earth people. Adam and Brad fitted the door — so professional.
Aaron Harfield
A month ago
Amazing job, could not ask for more from Lee and Adam.
