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Semi-detached extensions: everything you need to know

Deciding to extend your home is an exciting undertaking, allowing you to transform your space to meet your chosen style and practical requirements.

For homeowners looking to entertain guests, relax and enjoy time with the family, or take full advantage of their outdoor views, quality kitchen extensions remain highly sought after. Opting for a luxury kitchen extension on your semi-detached home should be an investment, and a chance to create a bespoke living area that maximises space and acts as a stunning focal point for your home.

Structural work to your kitchen can initially seem daunting, especially if you have a young family. You will, undoubtedly, wish to avoid disruption at all costs.

The Plus Rooms team, with their years of experience, can guarantee a swift design and build process free of hassle, chaos and upheaval. For instance, we’ll even set up temporary kitchen facilities. This allows families to continue having a space to cook, dine and entertain while they await the unveiling of their new and improved kitchen. 

Semi-detached kitchen extension ideas

We kickstart every design and build project by offering clients a one-on-one consultation with one of our team of experts. This will allow you to talk through your desired budget, timescales and practical requirements.

It’s our job to understand your vision, and this may include discussing previous projects that match your choice of style. Here are some fantastic examples of what we can achieve when building a premium semi-detached extension.

Make space for all the family

This Bromley home had an abundance of original character, exemplified in the distinct herringbone floor and exposed brickwork. Our wraparound extension added a modern touch with contemporary skylights and streamlined sliding doors, whilst also maximising space to help a multi-purpose family room where everyone can relax and enjoy themselves.

All the light you could ask for

Over the years, we’ve learned just how much lighting can do to transform a room. A standout example of this is this wraparound extension in Merton. Our large bifold doors, overhead glazing and subtle colour palette make for a fresh and relaxing space. Best of all, we created a new kitchen access and utility room to create a brand new entertaining area.

Bring the outdoors in

Our brief was to design something ‘warm and sunny’ for this Ealing home. While we did include a feature wall painted in a lovely golden hue, our brief is no better seen than in the vast bi-fold doors, which open up the extension to a panoramic outdoor view. The homeowners love entertaining in the garden and our extension makes it a breeze.

Flow between dining and entertaining

When designing this rear extension in Lambeth, we wanted to create something sleek and modern whilst retaining a sense of warmth. We decided to contrast the frameless skylights and sectioned ceiling with the rich, textured herringbone floor. The highlight of this extension is the contemporary garden doors, which are fully glazed and designed in a Crittall style.

Planning permission and permitted development for semi-detached extensions

Transforming a kitchen requires a variety of experts, from designers and architects to builders and project managers. There is a lot to decide, and you’re not alone in wanting to bring your extension to life quickly, effectively and within your budget. This is before you even begin to consider planning permission and permitted development.

You can carry out certain types of work to your home without needing to apply for Planning Permission. Instead, you can be granted ‘permitted development rights’. In the United Kingdom, all houses (excluding flats) have permitted development rights. The only exceptions are areas known as ‘designated areas’, such as conservation areas, national parks, and heritage sites. Homeowners who live in any of these areas are likely to need to apply for planning permission. 

There are also several conditions that an extension must adhere to for it to be classified as permitted development. Here are just a few examples, taken from our guide to planning permission for kitchen extensions

  • The extension must not take up over half of the land around the ‘original house’
  • The width cannot exceed more than half the width of the original house, and the height must not extend beyond four metres.
  • The extension must be built using materials that are similar in appearance to the existing house.

If you opt to have your extension built by the Plus Rooms team, our experienced project managers will handle every aspect of planning permission and permitted development, as part of our commitment to providing the highest possible standards of customer service.


Plus Rooms is London’s leading provider of kitchen extensions and loft conversions. We’re highly regarded for our masterful craftsmanship and professional project management services. In fact, 60% of new clients are referred to us by satisfied customers. To find out more about how Plus Rooms can transform your home, contact us today.

Design inspiration: Conservatory kitchen extensions

When we speak with clients interested in a kitchen extension, nine times out of ten they’re looking to maximise space. This opens up a world of opportunities for a homeowner, allowing them to bring in natural light, make spaces multifunctional and turn their kitchen into a place people want to gather. It is for this reason that conservatory-style kitchen extensions are one of the most popular home improvement projects.

With the kitchen playing such a central role in the home, any improvements must be subject to careful consideration, in terms of both style and practicality. In this article, we’ll outline some of the key factors in getting a conservatory extension right, as well as providing some design ideas to help homeowners get inspired.

Design considerations for conservatory style extensions

Firstly, you’ll want to consider the purpose of the kitchen. Do you want a show-stopping space for entertaining guests, a comfortable living area for the family, or perhaps a secluded nook for reading in the sunshine? All of these things will affect the layout and positioning of the final design.

Another thing to bear in mind is location. Natural light will make your conservatory appear bright, relaxing and welcoming. Therefore, it should be positioned to capture the most sunlight at times where you are likely to be using your kitchen. As well as this, if you have a garden or beautiful landscape outside your house, you may want to bring as much of it in as possible. This can be achieved with design features such as skylights or bi-folding doors.

Finally, your chosen style will have a significant impact on the finished product. This may seem obvious at first glance, but remember that style goes beyond decor and furnishing. For instance, clean lines are a hallmark of modern design, and these are often achieved with crown moulding, ceiling beams or other structural features. This shows that style is just as important as practicality when it comes to designing an extension.

With the expert designers at Plus Rooms, your only limit is your imagination. We are specialists in all aspects of improving residential properties and can take care of everything from applying for planning permission to managing the installation. We can even fit you with a temporary kitchen while work is carried out. 

Our conservatory-style kitchen extensions

Broken plan living 

The extension in this Lambeth home opens up space between the original kitchen and back dining room, creating an airy, calming living space while maintaining a subtle division. Highlights of the contemporary-style dining room include streamlined white ceiling beams and sliding doors, which open up to an expansive view of the garden.

Striking modern design 

A glass kitchen extension is a captivating addition to this modern Wandsworth home. This impressive design provides an unobstructed view of the garden, with clean lines being a recurrent theme throughout. Finally, the structural glazed roof provides a wonderful contrast with the textured flooring, which offers the perfect traditional kitchen aesthetic.

Staggered multi-purpose space

This Southwark family wanted to avoid the typical open-plan space and embrace their home’s original character. Therefore, we extended into the side return whilst also adding two metres to the rear. This created a series of distinct zones, each with its own unique atmosphere and eye-catching style. Finally, the extension was brought to life with a combination of skylights and windows, carefully placed to follow the lines of the mono-pitched roof.

Bright, open and inviting

We were tasked with creating a brand new living and entertaining space in this Wimbledon home. Our wraparound extension includes large overhead glazing and bifold doors. This floods the entire space with natural light to uplift the luxe neutral colour palette. The addition of a kitchen access and utility room creates a wide open space that’s perfect for hosting guests.


Even a small kitchen conservatory extension can have an impact on your home’s atmosphere and your own day-to-day life. A conservatory is a flexible option that can help you open up your kitchen and create a whole new ambience. If you need more design advice or inspiration, contact Plus Rooms today. Our team of experienced professionals will be happy to help.