- 4.4/5 Google Rated
- Established 1987
- 10 Year Guarantee
- CERTASS Registered
- Responsible Waste Recycling
Expand your living space with light-filled, custom-engineered extensions. From initial concept and groundworks through to structural build and architectural glazing, we take your vision from paper to polish across Hampshire, Berkshire, and Surrey.
Adding a custom extension or orangery is one of the most rewarding ways to transform how you live while significantly increasing your property’s value. However, juggling separate architects, groundworkers, builders, and window fitters can turn a dream project into a stressful ordeal.
At Excellent Windows, we offer a complete, single-source solution. Whether you desire a light-filled modern glass extension, a classical brick-and-glass orangery, or a thermal roof replacement, our team manages every stage. We combine technical precision with high-performance architectural glazing to deliver year-round living spaces built to the highest structural and aesthetic standards.
Tailored structures engineered for optimal light, thermal performance, and year-round comfort.
Combining the solid structural feel of a traditional brick extension with the skyward light of a conservatory, our orangeries are the pinnacle of bespoke design. Featuring insulated brick columns, flat roof perimeter pelmets, and central glass lanterns, they create majestic kitchen-diners and living suites.
Key Features: Perimeter Pelmet Lighting • Lantern Glazing • Full Brick Integration
Flood your property with natural light. Available in classic Edwardian, Victorian, Gable, and P-Shape configurations, our glass conservatories use advanced self-cleaning, solar-control glazing systems to deliver a bright, open connection to your garden without the heat build-up of older installations.
Key Features: Solar-Control Glazing • Self-Cleaning Glass • High-Performance Frames
Designed for modern family life, our solid-roof extensions and insulated LivinRooms deliver the cosy, permanent feel of a traditional house extension paired with large-span bifold or sliding doors. Engineered to eliminate thermal bridging, they remain warm in winter and beautifully cool in summer.
Key Features: Tiled or Solid Roofs • Integrated Structural Bifolds • Superior Thermal Insulation
Clean lines, graceful elegance. A most traditional style of conservatory.
Characterised by the upright front panel and high roof slope providing maximum light & space.
A simple, understated, classic-look conservatory which is square to maximise space.
Perfect if you need a dual-purpose space such as combining a playroom with a dining room.
A simple and economical way to add space and more natural light into your home.
A glass conservatory roof adds a modern, stylish look while letting in maximum natural light and reducing noise. With advanced glazing for better efficiency and a 25-year guarantee, it’s built to last.
This range offers self-cleaning and solar control properties, providing a premium glass solution.
A polycarbonate conservatory roof offers a lower-cost alternative to glass, available in a variety of colours and thicknesses to suit your style and budget. Durable and lightweight, it provides excellent value for money and comes with a 25-year guarantee for peace of mind.
For those seeking a more insulated and permanent solution, a solid roof conservatory is an option. Solid roofs deliver superior thermal efficiency, helping to regulate temperature year-round while giving your conservatory the feel of a true extension to your home.
Built for year-round comfort, energy efficiency, and long-term property value.
Engineered to withstand extreme UK weather conditions, every roof lantern, tiled system, and brick framework is custom-manufactured to exact site tolerances. Built using BSI and BBA-approved materials, our structures provide complete draft exclusion and maximum structural strength.
We prioritise your home’s security at every stage. All accessible architectural windows, bi-folds, and entrance doors integrated into your extension feature multi-point shootbolt locking mechanisms and anti-snap cylinder locks, fully compliant with Secured by Design standards.
Older conservatories suffer from severe temperature swings, too hot in summer and unusable in winter. Our living spaces feature multi-chambered thermal breaks, high-density wall insulation, and solar-control glazing that retains heat during winter while reflecting harsh summer sun.
We have partnered with some carefully selected manufacturers who tick all the boxes on quality, choice, service and price. All our conservatories offer superb weather resistance, heat insulation and strength; due to the advanced uPVC frames made from a recyclable material as well as solid guarantees.
Veka Conservatories are renowned for their superb quality and energy efficiency. A Veka conservatory will enhance your home and lifestyle and is available in several configurations, styles and colours, allowing you to tailor your conservatory to meet your needs and requirements perfectly.
Ultraframe offers one of the best frames on the market and exceeds the latest industry standards, giving you peace of mind that you are buying quality, BSI approved quality. In addition, Ultraframe offers a selection of colours and finishes and options on configurations, frame style, and glass.
LivinLight, also by Ultraframe, adds an insulated electrical housing system to the centre ridge of a glazed roof, enabling the installation of a wider lighting selection.
Quality conservatory and extension replacement roofs, providing incredible thermal performance year-round.
An UltraSky roof light will help you add the feeling of space and natural light to your home.
We deliver end-to-end design, build, and glazing projects across the South East. Explore our primary regional coverage areas below:
Many extensions and orangeries fall under Permitted Development rights, meaning full planning permission may not be required. During our initial site survey, we assess your property boundaries and local guidelines, guiding you through any planning or Building Regulations processes required.
Conservatories feature fully glazed walls and roofs, whereas orangeries utilise solid brick pillars, a flat perimeter roof with an internal plastered ceiling, and a central glass lantern. Orangeries feel more like a permanent room extension while retaining abundant natural light.
Timeline depends on scale and structural requirements. Simple glass additions can take 1–2 weeks on site, while complex brick-built orangeries with groundworks typically take between 4–8 weeks from base construction to final glazing fit.
Yes. All our living spaces feature advanced thermal break technology, high-density wall insulation, and solar-control glass. This eliminates the “greenhouse effect” in summer and keeps the space warm and energy-efficient throughout winter.
Our team of expert installers has extensive experience in fitting high-quality conservatories, extensions, and orangeries in a wide range of properties.
Whether you have a modern, traditional, or period home, we ensure that your new living space is designed and built to the highest standards, providing exceptional performance, durability, and style.
At Excellent Windows, we take a consultative and design-led approach. We never use pressure, false discounts or sales tactics. Instead, we spend time understanding your home, how each elevation looks, and what will genuinely enhance its character and value. Our clients trust us because we focus on the bigger picture rather than selling a single product.
You are supported by a leadership team with almost 120 years of combined experience. Technical or challenging installations are completely normal for us, and we never charge more for complexity. We regularly work on period homes, larger properties and bespoke projects where detail and symmetry matter.
Every installation we complete is fully covered by our 10-year insurance backed guarantee.
If for any reason, there is a problem with your product or the installation, we will put things right at no extra cost.
Discover valuable tips in our Maintenance and Cleaning Guide that will help you maintain your installations, ensuring they last longer and perform at their best. By following this guidance, you can avoid potential charges for repairs due to neglect or improper maintenance, keeping your products in line with their warranty.
Discover valuable tips in our Maintenance and Cleaning Guide that will help you maintain your installations, ensuring they last longer and perform at their best. By following this guidance, you can avoid potential charges for repairs due to neglect or improper maintenance, keeping your products in line with their warranty.
