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Design Inspiration: Glass Roof Kitchen Extension Ideas

Modern, sleek, and elegant, it’s difficult to beat the striking effect of a kitchen extension with a glass roof. At Plus Rooms, we’ve designed many different types of glass roof extensions for London homes, working with our client’s vision, our expertise, and the character of the property to create a bespoke result. Here’s a useful guide to inspire your home’s light-filled new look.

Benefits of a Kitchen with a Glass Roof

  • Light – This design brings in the most natural light, flooding dark corners, bringing in a warm glow even on dull days, and minimising the need for artificial lighting. It also looks incredible at night with the moon and starlight filtering into your space.
  • Open connection with the outdoors – With a glass extension you create almost-invisible walls between indoor and outdoor spaces, bringing your garden and natural surroundings into your living space while keeping the elements at bay. It’s the best combination of indoor-outdoor living for the UK.
  • Modern, elegant aesthetics – The design team at Plus Rooms works to make sure every functional and design element of your extension is perfected to create a superbly slick and contemporary result. Our glass extensions are not one-size-fits-all; they’re an extension of your architectural vision, adding significant appeal to your property.

What to Consider in Your Glass Roof Extension Design

When designing your glass roof kitchen extension, it’s important to take into consideration a few factors besides the aesthetic look of the project. This includes:

  • Heat loss – While we do use high performing double glazed units, this will still require more use of central heating during the colder months in the year than a more moderately glazed alternative.
  • Positioning – A glass roof extension isn’t generally recommended for South-facing projects. Instead, we would suggest some more moderate glass alternatives like this project we completed in Shawbury Road, which delivers plenty of natural light and openness without overexposing your kitchen and living space.

Types of Glass Roof Kitchen Extensions

To work with key aspects of your property and project, we offer several different types of glass roof kitchen extensions that are then customised to your project. Here are three inspirational projects to show you how they work.

Bold Industrial Appeal in Crawthew Grove 

Glass roof extension in Crawthew Grove, London

In this Crawthew Grove wraparound extension, it was decided that a glass roof with internal aluminium bars was the perfect fit. Here, the industrial structure of the partial glass roof compliments the exposed steel beam and Crittal-style glazing to bring warmth and natural light into a previously dark and pokey kitchen space.

Contemporary in Clapham, With a Sleek Glass Roof Kitchen Extension

Glass roof extension in Clapham, London

Modern glass roof kitchen extensions don’t need to remind you of your grandmother’s conservatory, as this sleek, contemporary glass roof in this Clapham home shows. With minimalist glass fins to the rear and combined structural silicone joints to the side return, the roof is supported without the need for UPVC or aluminium frames, creating a more seamless and artistic contemporary feel. This enhances the bespoke lighting, turning a functional portal for natural light during the day into an art piece at night.

Please note, when the glass roof span is over 1.5m width then silicon joints on their own are not sufficient support, the glass roof will require the additional support of either the aluminium bar or the glass fin. 

Outdoor Living Indoors in Wandsworth Bridge Road

Glass roof extension in Richmond Upon Thames London.

This Richmond Upon Thames home takes the concept of indoor-outdoor living to its most extreme and most striking with a modern take on glass roof extensions. This extension wraps around the entire home, creating a fully glass rear and side return extension with solid walls on the two side walls alone. The glass is held in place by an industrial steel structural frame and contains two large glass central doors, creating strong, clean lines that add a modern yet complementary wow-factor to this traditional home.

See more kitchen extension ideas here.

Speak to the design specialists at Plus Rooms and see your home’s true potential

Successfully transforming a property takes a combination of thoughtful design and expert construction, ensuring that the finished result is exceptional as well as practical, and durable. As a full-service team, Plus Rooms has designed and delivered over 1,400 home extensions across London, including exceptional quality glass roof kitchen extensions. To find out more about what we do and how our bespoke services can deliver the home your family deserves, contact us today.

Our Guide to Double Storey Extensions

One of the most remarkable and effective ways to transform your house into your dream home is to extend upwards and outwards at the same time. Double storey extensions are expensive but compared to the cost of buying a sizeable property in the area you’re settled in, they’re a cost-effective choice. And that’s not to mention the benefits of being able to maximise the value of your investment and design your home to your unique specs. If you have the space for this type of extension, we’d highly recommend that you get a quote on your favourite double storey extension ideas from a bespoke construction company before you consider a costly move.

How Much Does a Double Storey Extension Cost?

As with all building projects, the cost of a two-storey extension depends on several factors, including:

  • The location of your home and accessibility of the site – How far suppliers and teams need to travel, how easy it is to get materials onto the site, if you need a crane, etc.
  • Composition of the soil – This impacts foundation and structural requirements.
  • The size of the project – The larger the project the more labour and materials are needed.
  • The type and shape of the roof – Flat roofs tend to be more affordable than pitched, gabled, or crown roofs.
  • Your selected finishes – The cost and availability of your selected windows, doors, heating, flooring, and cabinetry, etc.

What Additional Costs Should I Expect?

These are complex and time-consuming projects, so it’s essential to include additional fees in your budget. Depending on the project, this can include:

  • Architects’ fees
  • Project Management fees
  • Survey costs
  • Structural engineer fees
  • Planning application fees
  • Building control charges
  • Party Wall Agreements
  • Interior fit out costs

All these costs depend on the specialists your project requires, negotiations for providing these services, and the organisations you partner with. Often, it’s a good idea to keep as many of these services with one party as possible, which streamlines the process and helps to keep costs down. This is where using a construction company that handles the project from start to finish (from design through to completion) can be exceptionally cost effective and hassle-free.

Planning Permission for a Double Storey Extension

These extensions do require planning permission, so it’s important to take this into consideration when looking for double storey extension ideas. Again, a bespoke construction firm will be able to guide you through this process and ensure that your plans are within all requirements.

Generally, the main contended aspect of a double storey extension is its height. The height of the extension’s ridge and eaves should not be higher than the existing roof and eaves. If your current property has low ceilings, these ceilings may be raised to accommodate a taller extension, or the extension can be set a little lower on the ground.

In a conservation area or if you have a period home, you might not be allowed to have a flat roof extension, but your design team can give you guidance here. Again, this can be incorporated into your design ideas in different ways, for example, by having multiple traditional pitched roofs or a crown roof design that gives the impression of a pitch with a flat roof hidden behind it.

Another consideration is the footprint of the extension, or how large it can be. Planning permission limits a double storey extension, saying it must project no further back than a line set at 45 degrees horizontally from the centre of neighbouring windows (sightlines), with a width less than 50% of the width of the existing house and a maximum length of 3m for terraced or semi-detached houses and 4m for detached houses.

Will a Double Storey Extension Add Value to My Home?

The answer to this question is almost always a resounding yes. Living space is the single-most in-demand factor for buyers, and people are willing to pay a premium, especially in high demand areas. How much value this will add is a different question.

We recommend getting quotes on a double storey extension for your home to get a clear idea of the costs. Then, you can measure the short-term costs against the cost of moving to a similar home in your area, remembering to factor in stamp duty, removal costs, and other expenses relating to a new home.

To get an idea of the value of your current property, you should get a valuation from 1-3 estate agents. Then, using your extension quote, measure these costs against similar homes for sale and recent homes purchased in your area. Remember to compare these based on price per meter, but also consider factors like the quality of the home’s design, desirable features you will have in your extension, and other aspects that add to buyer appeal.

This will also help prevent you from overspending on your double-storey extension or overinvesting in your property. Be Inspired By This Double Delight in Elmbridge

Double storey extension in Kings Mead Park, London

Planning permissions and fees aside, building a double storey extension is a creative and inspiring project. This Kings Mead Park home experienced a new, modern lease on life through a project that extended the ground floor out into the garden for a large kitchen and living space, created a new hallway WC, expanded the main bedroom into a king-sized suite, added a new 3rd bedroom, and flooded the space with natural light. Modern, chic, and with an eye on indoor-outdoor living, the design is enriched with sleek lines, quality finishes, and bold colours, creating a family home that’s the envy of the neighbourhood.

See more house extension ideas here.

For more double storey extension ideas or to get a quote on double storey extension plans, call the team at Plus Rooms today. We are an experienced, full-service design and construction business, handling every aspect of your construction projects and with an exceptional track record of completing over 1,400 projects in homes throughout London to world-class standards.

Single Storey Extension Roof Options

Single storey extensions are one of the most effective ways of creating that seamless open indoor-to-outdoor living that we enjoy so much. Whether you want to upgrade an outdated extension or are planning on knocking your cramped ground floor into an open and airy dream kitchen and living space, don’t forget to consider the type of roof your extension will have. While we spend a lot of time focusing on the square footage of your floor, remember that your roof will have a significant impact on the space. From the internal and external aesthetics to the cost of your build, the roof you choose is an important decision. With this in mind, let’s look at the different single-storey extension roof options available.

Pitched Roof 

The pitched roof is a classic design for many reasons. It allows rainwater to flow easily off the structure, preventing leaks and dampness, and it usually blends in well with the structure of the existing building too. This can be enhanced by using the same or similar materials as the original structure and keeping the pitch of the roof similar too. It adds a lot of indoor height, creating an architectural feature for your extension that can be enhanced with glazing, wooden beams, and rafters, or even left to create a sense of exceptional spaciousness.

These pitched roof extensions can be easily enhanced with skylights to help angle more light into your extension and can even be set against a flat roof to create interesting angled interiors. Because they tend to fit in so well with existing structures, pitched roof extensions are usually easier to get building permissions for, if required. These roof options do have their downside, however, as they tend to take longer to build, they require more labour and expertise, and are more expensive as a result.

An extension with a pitched roof in London

One great example of a classic pitched roof extension is seen on this Strawberry Hill home. It’s elegantly sympathetic to the original home’s design and architecture while still adding a contemporary contrast that modernises the space. The vaulted ceiling and skylights create a sense of volume and openness to the sky that makes the space feel clean, modern, and classic at the same time.

Gabled Roof

The gabled roof extension option is a popular type of pitched roof design with a triangular frontage, offering all the same benefits with a slightly different architectural feel. Gabled roofing is a great choice for homes that have classic or contemporary architecture, where gables are already in the original design, or for larger homes where you want an impressive frontage.

Like other pitched roofs, gabled roof extensions allow rain or snow to drain freely, are easier in terms of planning permission, and carry a higher cost because of the labour and expertise involved in the project. You can fully glaze the gabled end to let in even more light and create a striking architectural element, leave it open and vaulted for interior drama and spaciousness, or fill it with beams and rafters for rustic appeal.

A kitchen extension in London with a gable roof

This Battersea home shows off a beautiful gabled extension that maximises living and family space while adding a high-impact architectural feeling to the original building. By showing empathy to the original Victorian architecture through exposed bricks but ensuring wide open entertainment spaces and seamless indoor-to-outdoor living, it brings together the best of both worlds.

Flat Roof

Flat roof extensions have become very popular around London because they are more economical and faster to build, add a contemporary twist to a property, and allow you to bring a lot of natural light into the space. These roofs must be well-designed and properly built, however, as a flat roof can be prone to leaking if it is not waterproofed, designed, and installed correctly, especially if you are considering skylights. 

They look elegant and striking against modern and classic architectural styles, blending old and new to add function and open living space to every type of home. They are especially popular on terrace homes, as they are low profile and don’t intrude on the view. You can get creative with a flat roof extension, such as using large-scale glazing for a view of the stars, and more.

Kitchen extension in London with a flat roof

This Wandsworth home truly brings indoor and outdoor living together by creating a fully glazed space open to the garden. The structural glass and steel composition mean that it’s always filled with natural light, and you feel as though you’re living under the stars at night.

Hip Roof

A hip roof is a pitched roof that connects with a flat roof extension, and it’s the most popular way to expand your home through the side return. That’s because the angle allows rain and snow to run off easily, and the skylights capture more sunlight at the same time, so your larger space is made lighter and airier. When done right with a considered approach to the new space, a hipped roof extension isn’t low or cramped – instead, it adds a metre or two of much-needed space while making the room lighter, brighter and more functional.

Kitchen extension in London with a hip roof

In this Southwark home, you can see the new flat roof and hipped roof extension and how they work together. Not only does it create that open, modern garden lifestyle we all love, but it also creates visual interest and architectural features that give the space character and depth. If you have a terrace and want to expand to the side or the side and rear, the hip roof is usually your best option both budget-wise and in terms of getting an elegant final result.

Crown Roof 

Crown roof extensions combine elements of both flat and pitched or gabled roofs to overcome certain design challenges. For example, if you want some of the volume of a pitched roof but cannot extend above a certain height, your roof can combine pitched sides with a flat centre roof to create a crown roof to achieve this. Another good reason to use a crown roof is to get that internal height but prevent your pitched roof from blocking second storey windows or views. Aesthetically, these roofs are very elegant when designed professionally, giving your home a clean and modern look as well as a functional interior space.

Kitchen extension in London with a crown roof

This Claygate home uses the crown roof extension option with style to create an entirely new kitchen, dining and living space. Here, a flat roof may have looked too harsh against the traditional Esher home, but a pitched roof would block the view from the windows above. The crown roof is a perfect compromise, creating a generous and airy living space that sits comfortably against the original architecture.

See more house extension ideas here.

Want to find out more about single-storey extension roof options? Chat to the Plus Rooms team. We’re a bespoke design and construction firm in London specialising in high-quality home extensions that transfer houses into dream homes.

Real Homes March 2022

Gorgeous green kitchen has a fresh feel

A stunning extension and Charley Smith’s clear design vision has resulted in a family kitchen-diner that’s ripe for entertaining.

Feature   Ifeoluwa Adedeji
Photography   Adelina Iliev
Project Build   Plus Rooms 

Sometimes you only know what you want when you see it, and that was exactly the case for Charley when she found a new family home for her husband, Adam, and their two young children. Although the house was a bit of a mismatch and looked like nothing had been done to it for a couple of decades, it had beautiful features such as stained glass, parquet flooring and fireplaces – all elements that helped seal the deal. Charley knew they’d build a beautiful new extension to replace a conservatory that was on its last legs – and now, with the project completed, she tells us how she did it.

The couple had a good idea of the finish and style they wanted to achieve. Charley factored in lots of gold accents when choosing the colour scheme. Design & Build Plus Rooms, Kitchen Naked Kitchens,  Glazing Integral Home, Flooring, Tile Expert. Stools, Furniture & Design Studio. Pendants, Cox & Cox. Wine cooler, Caple

‘The house needed a bit more TLC than we thought,’ says Charley. ‘The windows were single glazed and the panes were cracked, so we needed to replace them, then other things cropped up that we didn’t think we’d have to do. The foundations needed to be deeper as the soil has a high water content and we’re on a hill. The floor was a beautiful mosaic, but was all cracked and needed to be replaced. We moved in December 2019 and started on the windows, then Covid happened and we had to stop with half the windows done. We got the building works completed between lockdowns one and two. We lived here during the build, but fortunately it was summer, so it wasn’t too cold.’

A larder cupboard provides lots of storage and makes it easy to tidy appliances away

The owners Charley Smith (@thetreehouse_onthehill), who works in asset management, her husband  Adam, who works in advertising, and their children, Esmeralda and Ruben
The property A five-bedroom 1920s house in Forest Hill
Project cost £180,000 (for kitchen extension and garden)

‘We converted the original kitchen into a hallway and utility room, knocked down the old conservatory and built out and across. The former kitchen had a galley layout and a huge Aga, but we wanted something that was open plan and connected to the living area and playroom, and for us to be able to get out to the garden. We used Design & Build firm Plus Rooms who did a pre-planning package and knew what was allowed in terms of planning permissions. We had one pushback, which was that they wanted us to drop down the roof height once we reached the border of the neighbours. We wanted it to be as high as planning would allow so the room would feel more spacious and bring in lots of light.’

Charley considered the practicalities of family use when planning the design and choosing materials. ‘It was important to think about how easy the floors and work surfaces are to clean, as well as how durable the units are.’ Sink, Perrin & Rowe. Tap, Quooker. Worktop, Croydon Granite. Oven, Bosch

‘We would have loved a deVOL kitchen, but it was out of budget. A friend recommended Naked and we found it to be a really good middle ground in terms of design and quality versus price. We did a lot of the planning ourselves and really led the project, telling them we wanted a bank of units along the wall, an island and a dresser. We went against advice for the distance between the island and wall units and brought the island out further to make the kitchen more spacious. 

‘We wanted a style in keeping with the period of the house and chose frameless Shaker doors that are a bit more modern – I’d say what we have now is a mix of the old and new.’

’For the lighting under the skylight, we came up with a creative solution using a curtain pole and a light we designed from Creative Cables.’ Discreet underfloor heating frees up wall space from radiators. Skylight Integral Home, Dining set, Loaf. Lights, Creative Cables. Chairs, Six The Residence

‘Originally our architect designed the extension with a whole wall of glass at the end, but I wanted some sort of separation between the kitchen and the dining area, so we have two sets of doors with a little wall in between. I think it actually makes the space feel bigger. 

‘I ordered almost all the possible paint samples as I love colour, but we ended up choosing an emerald green I came across on social media – I really love it. We were originally looking at dark colours that would match the Crittall-style doors. I always wanted this style; it’s in keeping with the property and matches the stained glass windows, which are leaded.’

The garden has been tamed and offers a space for the children to play while the grown ups can watch them from the kitchen or the patio. Tiles, Bert & May. Parasol, Jumping Bean London. For a similar table and benches, try the Olbia by Beliani

‘We had a budget to stick to but because we were thrifty, we didn’t have to scrimp on anything. I searched high and low to get the Buster & Punch-style handles that I loved. I found the ones we used via Plank Hardware. I’d definitely recommend asking for a discount on every single purchase you make: you don’t always get one, but most people will be willing to give you something.’ 

‘My other tip is to stay focused. You can get really distracted with Pinterest and Instagram and can get decision fatigue when doing a big project. Stick to what you love and go with your gut.’