uPVC Casement Windows

High-Efficiency and Versatile Design

uPVC Casement Windows

Southeast Windows Ltd offers top-quality uPVC Casement Windows with BFRC-approved energy ratings of B, A, A+, and A++. These windows, available with triple glazing options, meet the latest energy efficiency standards. As of June 15, 2022, all windows and doors must have a minimum U-Value of 1.4W/m²K, requiring a warm edge spacer bar and Argon gas for a minimum B energy rating.

No Sales Pressure

At Southeast Windows Ltd, we follow a non-commission-based sales approach. You won’t feel pressured into making quick decisions. Take your time, do your research, and share your project requirements with us. We prioritise addressing your needs and answering your questions.

The EnergyPlus System

The Liniar EnergyPlus window system features six multi-chambers designed to trap warm air, achieving U-Values as low as 0.8, which is ideal for Passivhaus homes using triple-glazed units. Liniar’s patented double-action bubble gasket ensures a continuous seal around the windows, even in corners, preventing drafts and ensuring zero air leakage. With various frame colours, finishes, hardware, and glazing options, this window system is perfect for any home. It also offers complete versatility in window designs and security options, making it ideal for new build projects with Document Q approval.

A+ Energy-Rated Windows

Our standard EnergyPlus A+ energy-rated uPVC window offers slim sightlines that allow maximum light into your home. Available in top or side-hung, arched top, or French casement window styles, these windows also feature easy-clean hinges, making maintenance a breeze.

Quick Turnaround

We understand the importance of timely project completion. We can install your made-to-measure Casement Windows within two weeks from the order date, ensuring a quick turnaround, subject to a site survey and your requirements.

Draught-Free Performance

Our Liniar uPVC casement windows are engineered to keep your home draught-free, thanks to the unique, patented double-action bubble gasket that ensures a tight seal. The six-chamber EnergyPlus system delivers energy ratings of A+13 Solar Gain. You can upgrade to triple glazing for even higher efficiency, achieving A+23 Solar Gain with a proven BFRC license. Our double-glazed units also feature a soft-coat Low-E coating, argon gas between the panes, and a warm edge spacer bar to maximise energy efficiency.

Frame Profiles

Our uPVC casement windows come in sculptured (Ovolo) or chamfered (bevelled) 70mm profile frames. You can mix and match styles at no extra cost, ensuring a personalised touch.

Ovolo Profile: Offers a traditional finish with rounded edges, ideal for both period and modern properties.

Chamfered Profile: Provides sleek, clean lines perfect for contemporary homes with a modern aesthetic.

Enhanced Security

Our windows feature Secure by Design locking systems like the Kendrick Excalibur, tested for 100,000 cycles and backed by a 10-year mechanical guarantee. Upgrade to triple glazing with an A++ energy rating or add soundproofing glass units with Pilkington 6.8 Optiphon. We also offer PAS 24: 2022 standards for ground-floor dwellings and vulnerable areas.

Durability and Style

All our Liniar uPVC casement windows are internally beaded and fully welded for added security. You can choose from various leaded glass designs, including square lead, diamond lead, and Queen Anne styles, or customize with stained glass overlays, astragal bars, or Georgian bars for added character.

Thermally Efficient Windows

Liniar’s EnergyPlus profile prevents cold air from entering your home, maintaining warmth and ensuring superior insulation. The six-chambered design exceeds existing energy performance standards, providing exceptional energy efficiency.

Our ISO-BLOCO HYBRATEC advanced insulation foam tape ensures complete airtightness, eliminating heat loss and enhancing your home’s energy efficiency.

FENSA Certification

Southeast Windows Ltd is authorised to self-certify window installations as a participant in the Fenestration Self-Assessment Scheme (FENSA). Our surveyors and installers undergo rigorous vetting, allowing us to ensure compliance with all Building Regulations.

Comprehensive Survey Process

Our thorough survey process guarantees your installations meet all necessary regulations. We carefully consider factors such as glass selection, fire escapes, and trickle vents for ventilation, in-house risk assessments and method statements, ensuring a worry-free experience.

Want to know More?

Call us today for your FREE, no-obligation quotation or fill out our Contact Form! For the most modern, energy-efficient replacement Windows, Doors and Conservatory with a 10-year Insurance Backed Guarantee for complete home Comfort & Designed to Keep You Warm, Safe, & Secure.

Alternatively, call your local number below to arrange an appointment.

East London Double Glazing: 020 8472 4088 (head office)
South London Double Glazing: 0203 856 6667
North London Double Glazing: 0203 856 6669
Epping: 01992 940 809
Chelmsford Double Glazing: 01245 208 058
Romford Double Glazing: 01708 2 02 457
Great Dunmow Double Glazing: 01371 704 771

Southeast Windows Ltd – Your trusted partner for innovative, energy-efficient, and stylish window solutions.

huong Luc

14:01 19 Dec 24

The team was led by Peter - great comms, double glazing patio door to insulate the ground floor bedroom, replaces single glaze door. After installation there was a slight problem but it was resolved in good time. Thank you.

Laurence Radford

15:17 19 Nov 24

Roy and team did an excellent and professional job replacing 3 front windows, making the change unnoticeable from the outside. They were worked with challenges getting large frames into the upstairs room and were courteous throughout. Would recommend.

Kate Cleaver

11:03 14 Nov 24

Really happy I chose Southeast Windows to fit my UPVC back door. Roy was friendly, professional and helpful at every step of the process. I was very happy with the workmanship and it was done so efficiently and with so little mess. I definitely recommend for a first class service !

Derek Wong

08:30 30 Oct 24

I would like to express my heartfelt thanks to Southeast Windows for their exceptionally good service. From the moment I reached out to them, their team demonstrated professionalism and efficiency that truly impressed me. The installation process of double glazing was remarkably fast, allowing me to enjoy the warmth of the new windows brought sooner than expected.Moreover, I was particularly impressed with the cleanliness maintained throughout the whole installation project. The team took great care to ensure that my home remained tidy, leaving no mess behind. This attention to detail speaks volumes about their commitment to customer satisfaction.Besides, the quality of the windows is outstanding. The windows not only enhance the aesthetic appeal of my home but also provide excellent insulation. I am thrilled with the results and would highly recommend Southeast Windows to anyone in need of window services. Thank you Roy and your team once again for your hard work and dedication!

Marc Jones

12:47 21 Jun 24

Amazing company and service. High quality work at very good price. Very efficient with great communication throughout. Would 100% reccomend.

David Gridley

11:10 07 Sep 23

Excellent work from Roy and his team. He installed our windows quickly and with a minimum of dust etc. They also took away the old windows which was a great help.

Arnold Cabanus

21:11 06 Mar 23

We recently had all our old windows replaced and installed by Southeast Windows. Everything, from the survey to the installation day runned smoothly .We are delighted with the excellent window installations that they did and left our house clean and tidy after. This company is very trustworthy , professional and courteous. If you need an honest and efficient windows installation company, definitely Southeast Windows Ltd is highly recommended.

Leah Corney

16:38 10 Feb 23

We chose southeast windows to replace our old upvc windowsfrom initial survey company were very informative explaining different options available fensa warranty fire regs etcquotation was very competitive detailing all widow specifications everything what we was getting including removal of all rubbishSo glad We went with triple gazing option not that much extraguys arrived early every morning we’re courteous and professional at all times did a fantastic job of installing windows clean and tidywindows look fantastic house is so much warmer and noise reduction really please we choose this company would definitely use againHighly recommend

Steve Clare

16:01 04 Oct 22

Had the double-glazing at the front of my house replaced. Really impressed with the quality of the work and the value for money. Roy is a real expert. All in all, absolutely delighted and very happy to recommend Southeast Windows. Five star review.

Hilary Armstrong

15:11 08 Sep 21

Roy and his team fitted new windows and French doors in our house earlier this year (we wanted to live with them for a while before reviewing!). We are really pleased with the quality of the windows and the service from Roy. He's a real gent to deal with and is punctual and professional. His quote wasn't actually the lowest but he was the only one to supply full details of materials, give fire safety and security advice, send a detailed quote etc. Thank you Roy

Megan Monaghan

10:33 04 Jun 21

I got quotes from a few companies however Peter was the only one who followed up to my questions on email so I decided to go with Southeast Windows. I am super glad I did, as Peter was professional and I am really happy with the work done in installing a new PVC backdoor and replacing glass in several windows. Peter was knowledgable, friendly and didn't take advantage of my lack of knowledge of window and door installation like some other builders have, being a first time home owner.I wouldn't hesitate to recommend Peter and Southeast Windows, I will for sure be using them again if I need. Thank you Peter!