21 Stunning Ideas for Kitchen Extensions

ByHelen Powell Last updated
A modern white kitchen extension.

Need more space in your home? These stunning ideas for kitchen extensions seamlessly blend functionality with high-end style.

If your kitchen is starting to feel a bit cramped or disconnected from the rest of your home, I’ve got some gorgeous inspiration to share. A well-designed kitchen extension can not only give you more storage, countertop and floor space, it can also improve the flow of your home and even increase its resale value.

But before you rush to draw up plans or hire a contractor, there’s one thing I’d really recommend you do based on my own recent experience of planning an extension build.

A contemporary minimalist kitchen extension with a pitched ceiling.
Image: Our kitchen extension

Take some time to consider your lifestyle, your priorities and the overall look and feel you want to achieve.

When we were designing our modern minimalist kitchen extension our main goal was to create a sense of space and add architectural interest to the ground floor, so we knew from the start that a full height ceiling was non-negotiable.

For you, a high spec kitchen diner designed for cooking and entertaining might be the priority. Or perhaps a family-friendly room that can accommodate the hustle and bustle of daily life? Maybe your dream is to establish a seamless sense of connection with your garden, or to embrace the tranquillity of a minimalist space.

Understanding what you really want from the space is the key to creating your ideal kitchen extension. Each choice you make, from the structural design to the smallest decor detail, should reflect what you are ultimately aiming to achieve

In this post, we’ll explore a range of kitchen extension ideas that not only expand your kitchen’s physical space but also enrich its functionality and aesthetic appeal. From open-plan layouts that invite social interaction to serene garden views that bring nature indoors and walk-in pantries that offer practical elegance.

Modern Ideas for Kitchen Extensions

1. Vaulted ceilings

A light kitchen extension with a vaulted ceiling and doors leading out onto the garden
Image: deVOL

Create added architectural interest with a vaulted ceiling for an airy and spacious feel.

2. Bi-fold or sliding doors

A modern kitchen extension with sliding doors leading to the garden.
Image: Rotherfield Street – Atelier Baulier, © Henry Woide

Open up to the garden with bi-fold or sliding doors.

3. Luxe Metal Finishes

A modern open plan kitchen extension with brass clad storage cupboards.
Image: Rotherfield Street – Atelier Baulier, © Henry Woide

Incorporate copper worktops or brass clad cupboards for a luxe, high-end feel.

4. Contrast colour windows and doors

A modern kitchen extension with bright green windows
Image: Colour Casing – District. Architects

Create dynamic visual interest with windows and doors in a bright contrast colour.

5. Window seats

Window seat in kitchen extension
Image: Breathable House – Mike Tuck Studio, ©Luca Piffaretti

Create a cosy reading nook with window seating.

6. Roof terraces

A London home with a roof terrace above a modern kitchen extension
Image: Brückehaus – R2 Studio Architects

Incorporate a roof terrace above the kitchen extension to create a unique outdoor space for evening drinks and relaxation with a view.

7. Bold colours

A bright yellow kitchen extension
Image: CLT House – Unknown Works

Go bold with bright colour to infuse energy and personality into your design.

8. Contrast brickwork

A kitchen extension with contrast brickwork
Image: DB Apartment – Studio Hallett Ike

Incorporate contrasting brickwork to add texture and visual interest, blending traditional charm with modern design.

9. Minimalist design

A minimalist kitchen extension
Image: Elizabeth Mews –Trewhela Williams

Create a tranquil Zen-like feel with clean lines, natural materials and minimalist flooring.

10. Built in bench seating

Bench seating in a modern kitchen extension
Image: Rotherfield Street – Atelier Baulier, ©Henry Woide

Add built-in bench seating to create a cosy, space-efficient dining area, with hidden storage underneath.

11. Garden views

A white home extension and garden
Image: White Patio House in Camberwell – Pashenko Works

Design your kitchen extension to maximise garden views, establishing a serene and natural backdrop for cooking, dining and entertaining.

12. Kitchen islands

A large kitchen island in a modern kitchen extension
Image: Finkernagel Ross

Anchor your kitchen extension with a beautifully crafted kitchen island, blending utility with sophisticated style.

13. Statement lighting

A row of pendant lights in an elegant kitchen.
Image: deVOL

Use bold pendant lights or chandeliers to create a stunning focal point.

14. Skylights

A modern kitchen extension with a large round skylight that floods the space with natural light.
Image: Low Energy House – Architecture for London, Lorenzo Zandri

Install skylights to flood the space with natural light and create an airy, open atmosphere.

15. Open plan layouts

A modern kitchen extension with floor to ceiling glass windows.
Image: XUL Architecture, photography by Matt Clayton

Opt for an open plan kitchen layout to enhance social interaction and create the perfect space for effortless entertaining.

16. Floor-to-ceiling windows

A modern home extension with floor to ceiling glass windows.
Image: Architecture for London, photography by Christian Brailey.

Create a bright, airy space with wall-to-wall glass windows.

17. Modern ceiling beams

A light filled modern kitchen extension with ceiling beams
Image: Studio Hallett

Add contemporary wooden beams for a modern twist on a classic architectural feature.

18. Walk-in pantries

A large walk-in pantry with habderdasher style storage.
Image: deVOL

Include a luxurious walk-in pantry to provide ample storage and easy access to all your ingredients and utensils.

19.Glass roofs

A modern kitchen extension with a glass roof.
Image: Nimtim Architects

Install a glass roof for a stunning, light-filled space that blurs the lines between indoors and outdoors.

21. Side returns

A side return kitchen extension on a London home.
Image: Finkernagel Ross

Integrate a side return kitchen extension to enhance space and flow.

How Much Does a Kitchen Extension Cost?

The cost of a kitchen extension in the UK can vary significantly based on several factors, including the size of the extension, the materials used, and the complexity of the design. On average, homeowners can expect to pay between £1,500 to £2,500 per square metre for a standard single storey kitchen extension.

Key elements influencing the overall cost include:

  1. Size and Design: Larger extensions naturally incur higher costs. Additionally, bespoke designs that require unique architectural features or materials can escalate expenses.
  2. Materials: The choice of materials plays a significant role. High-quality finishes, such as granite worktops or premium flooring, will increase the total expenditure, while more budget-friendly options can help keep costs down.
  3. Labour Costs: Skilled labour is essential for a successful extension. Rates vary by region, with costs typically higher in London and the South East compared to other parts of the UK.
  4. Planning and Legal Fees: Depending on whether you require planning permission or need to hire professionals like architects and surveyors, these costs should be factored into your budget. Planning fees can range from £100 to £500, while architect fees may add 5-15% of the total build cost.
  5. Additional Features: Incorporating features such as bi-fold doors, skylights, or underfloor heating can enhance the space but will also contribute to the overall budget.
  6. Finishing Touches: Don’t forget to budget for appliances, cabinetry, and decor, which can add thousands to the total cost of your new kitchen.

It’s essential to establish a clear budget and obtain multiple quotes from builders and contractors to ensure competitive pricing for your renovation. Consider setting aside an additional 10-20% for unexpected expenses that may arise during the construction process.

Overall, while a kitchen extension can represent a significant investment, it often adds considerable value to your home and enhances your living space, making it a worthwhile consideration for many homeowners.

Planning Permission and Permitted Development for Kitchen Extensions

When considering a new kitchen extension, understanding planning permission and permitted development rights is crucial to ensure a smooth build process.

Planning Permission is often required for significant changes to your home, particularly if your project involves altering the structure or increasing the footprint. This typically applies to larger extensions or those that affect the exterior appearance of your property. It’s essential to check with your local council, as regulations can vary based on location.

On the other hand, permitted development allows certain types of extensions to be constructed without the need for formal planning permission, provided they meet specific criteria. For instance, single storey rear extensions are often permitted as long as they do not exceed a certain size. However, these extensions must adhere to guidelines, such as height restrictions and proximity to boundaries.

For kitchen extensions, particularly those that are modest in scale, exploring permitted development can save time and streamline the process. Always consult with the local planning authorities to confirm your options and avoid potential setbacks.

Bringing your vision to life

Whether you crave an airy, open-plan kitchen designed for entertaining or a cosy family-friendly space that invites connection, there are so many ways to creatively extend your home and add the wow factor.

As you explore different design ideas, think about the emotions and experiences you want to evoke, and let this guide your layout, material and design choices.

Though the construction process requires an investment of time, effort and resources, the payoff is immense. Just imagine the pride and enjoyment you’ll feel as you host family gatherings, casual breakfasts or impromptu dance parties in your warm, welcoming new space.

Find more images of kitchen extensions over on my Pinterest.

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