11 glass extension design ideas

A glazed extension is a striking addition to any home, whether it's traditional or modern. Take inspiration from this selection of beautiful glass extension design ideas

TODO alt text

A glass extension is an impactful and stunning addition to a house of any style, whether it's a matching addition to a modern home, or a contrasting extension to a traditional property. Glazed extensions are also a perfect way of creating room while flooding existing space with light, with the addition of bi fold doors and roof lights.

If you’re looking to extend your home, fill your home with light, or are simply looking for inspiration for your future project, get some ideas from this selection of incredible glass extension ideas.

Find out all you need to know about building a glazed extension in our practical guide.

1. Merge indoors and out with an open-aspect glass extension

To create an uninterrupted view of the garden from their East Sussex home, the Pollins family wanted to remove the boundaries between indoors and out.

Origin’s bi-fold doors were recommended for the large expanse of glass and modern architecture they wanted. Two sets allow the entire extension to open out, with the aluminium doors powder-coated in white to match the French windows.

Find out how to choose the best bi-fold or sliding glass doors.

origin-open-aspect-glass-extension

A similar project would cost £30,000 to £35,000 for construction and materials

2. Flood indoors with light with a two-storey glass extension

This County Armagh-based family asked Des Ewing Residential Architects to reorganise their home and open it up to the garden.

The result was a simple contemporary box-shaped extension, with two-storey windows and a double-height space giving it a dramatic look. Aluminium-framed glazing and zinc cladding keep it maintenance-free. A new kitchen-dining-living area leads out to a patio.

Find out more about how to build a two storey extension in our guide.

two-storey-glass-extension

A similar box extension would cost around £150,000

3. Create a seamless connection to the garden with a slim frame glass extension

Architect John Onken was asked to transform the ground floor of a west London house by its owners, who wanted a simple yet elegant kitchen and dining space to complement the new kitchen cabinetry they had planned.

A frameless glass addition was designed to make use of the small patio garden, blurring the boundary between eating inside or alfresco. Black porcelain floor tiles contribute to the seamless connection, and the challenge of lighting the space at night was solved by positioning a light fitting at the edge of the space to throw light inward.

glass-extension-with-slim-frame

A similar project would cost around £88,000 for materials and construction

4. Create a bright home office in a glazed extension

Tasked with sensitively extending this traditional cottage in Esher, Surrey, by the couple who own it, IQ Glass had to make the new structure as minimal as possible.

A glass box-style design with supporting steel sections features painted glass bands in a light grey finish to match the existing palette. The new space now houses a home office, which sits perfectly on the corner of the property.

Find out all you need to know about designing a home office in our guide.

glass-extension-home-office

Including design, supply and installation of the glass box, the project cost £28,800

5. Build a glazed kitchen extension

As part of a refurbishment, this north London family asked Lipton Plant Architects to create an open-plan space leading out to the garden of their home.

To obtain a level finish, the floor of the entrance room was lowered to meet that of the rear room. The depth of the floorplan meant as much light as possible was needed, so a glass box design lets daylight in, while creating better views of the garden through bi-fold doors.

Find out how to plan the perfect kitchen extension in our practical guide.

glass-corner-extension

A similar project would cost around £3,000 per m²

6. Adding a glass extension to a listed building

The owners of this Grade II-listed north London property wanted to open up the lower-ground-floor kitchen and living area and extend into the garden, so asked Smerin Architects for a light-filled contemporary glass extension.

The local authority planners didn’t object to a glass-box-style new addition supplied by IQ Glass, and the back wall of the original house can be seen through the glazing.

Find out more about adding a glazed extension to a listed building.

glass-box-glass-extension

This extension cost around £42,000, including all works above ground level

7. Create a glazed conservatory space

A single-storey and a double-height extension were designed for this family home in Leatherhead, Surrey, by Granit Architects.

A glass box was created at the point where the house changes orientation, and the extension runs parallel to the boundary. Glass articulates this pivot, introduces light, and creates a 180º view. A sliding pocket door can be drawn across the glass to make the space cosy in winter.

Find out more about the ins and outs of adding a conservatory or sunroom to your home in our guide.

glass-extension-to-traditrional-home

A similar extension would cost from £2,500 per m² for construction and materials

8. Add a statement glazed extension to a period home

Poor garden access and a dark kitchen led the owners of this Victorian home in Edinburgh to ask Zone Architects for a contemporary glass extension ideas.

A glass-walled pavilion features a slender-edged floating roof to avoid a top-heavy appearance, with fully retractable glass doors on its southern aspect. It adds a light-filled kitchen-diner to the house, and continues the series of reception rooms that face the garden.

See more statement extension ideas in our design gallery.

AT HOME - DICK PLACE

A similar project would cost around £2,000 per m²

9. Angle your extension to make the most of the daylight

A single-storey and a double-height extension were designed for this family home in Leatherhead, Surrey, by Granit Architects.

A glass box was created at the point where the house changes orientation, and the extension runs parallel to the boundary. Glass articulates this pivot, introduces light,and creates a 180º view. A sliding pocket door can be drawn across the glass to make the space cosy in winter.

Find out more about building a single storey extension in our essential guide.

rotated-glass-extension

A similar extension would cost from £2,500 per m² for construction and materials

10. Add an orangery to suit a period home

If yours is a period home, a contemporary glazed box might not suit it – or your taste. And, while conservatories look beautiful in rustic settings, an urban property is better suited to orangery-style glass extension ideas. The difference? An orangery tends to have more solid elements to its structure – although it is mostly a glazed addition. 

Find out all you need to know about planning an orangery in our design guide.

Orangery by Westbury Garden Rooms

(Image: © Westbury Garden Rooms)

11. Add a side return extension 

We love a spot of statement glazing, and this stunning side return extension has certainly captured our attention. Glass works best in a barely-there style, so we love the wide expanses of glazing and the boldly executed roof. The exterior packs a punch thanks to the contrast of traditional brickwork and sleek black-framed finish. Most of all, though, we’re sold on the window seat. Picture chilly autumn nights curled up with a cushion, a glass of wine  and a blanket... bliss. A similar extension  would cost around £70,000. Yard  Architects

A glass extension by Yard Architects

(Image: © Richard Chivers)

Read more on designing and building an extension: