Home Extensions

Impressive Home Extensions Package

Home Extensions

At Southeast Windows Ltd, we offer a comprehensive home extension package. Since our establishment in 1999, we’ve been based in London, providing complete single-storey extensions from start to finish. Investing in home improvements enhances your living experience and boosts your home’s value, size, and curb appeal.

Tailored Service from Start to Finish

Our service begins with a free site survey to discuss your requirements for the new building. Our skilled tradespersons, based in London and Essex, are fully qualified and take pride in their craftsmanship. We’re confident you’ll be delighted with the final result.

Custom Designs with 3D CAD Drawings

Each extension is uniquely designed to match your building’s shape, size, roof design, and specific needs. Our 3D CAD drawing facility allows us to create detailed designs of your extension, enabling you to make adjustments and visualise the final product inside and outside.

Versatile Design Options

Our flexible design options include French Doors, Bi-Folding Doors, Glass roofs for Conservatories, Hybrid roofs combining Glass and Insulated panels, Solid Roofs for better insulation, and Velux-style windows for added light and ventilation. Additionally, you can choose from various brick colours, window styles, and RAL colours to match your preferences, ensuring complete satisfaction with the results.

Base Options for Building Regulations

We provide two base options for extensions, updated to meet the latest building regulations as of June 15, 2022. The U-value requirements for floors in England have changed, now requiring a U-value of 0.18W/m²K.

Traditional Build

This method involves removing a significant amount of dirt and requires a trench that is 600mm wide and at least 1 meter deep, filled with C20/25 concrete. If trees are nearby, the depth may increase to 1500mm based on building inspectors’ recommendations.

DurabasePlus 100 System

The DurabasePlus 100 system is designed for single-floor extensions and conservatories. It provides a quicker, cleaner, and more cost-effective alternative to traditional building methods.

The system surpasses building regulations with a U-value of 0.17 W/m²K and comes with a 25-year manufacturer’s guarantee, offering both efficiency and peace of mind.

Managing Drains and Regulations

Before building over or near a public drain, you must contact your sewerage company to comply with regulations. Traditional concrete foundations can’t be used over manholes because the Water Authority requires access, and manholes inside a building raise flooding risks. If a manhole disrupts your extension plans, consider relocating it. Alternatively, the DurabasePlus 100 system offers a cost-effective solution with a cutout in the steelwork for easy drain access and a double-seal inspection chamber.

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

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!