The Ultimate Guide to Kitchen Extension Cost and Design

kitchen extension cost

Are you thinking of extending your kitchen to create more space, functionality, and value for your home? If so, you might be wondering how much a kitchen extension costs and what are the best design options for your project. In this guide, we will answer these questions and provide you with some useful tips and inspiration for your kitchen extension.

How Much Does a Kitchen Extension Cost?

The cost of a kitchen extension depends on various factors, such as the size, shape, style, and location of your extension, the quality and quantity of materials and fittings, the level of finish and complexity of the work, and the type of contractor you hire. However, as a general rule of thumb, you can expect to pay around £1,500 to £2,000 per square metre for a basic kitchen extension, and up to £3,000 per square metre for a high-end kitchen extension.

To give you an idea of the total cost, here are some examples of kitchen extension prices based on the average UK house size of 85 square metres:

  • small kitchen extension of 10 square metres (12% of the house size) would cost between £15,000 and £30,000.
  • medium kitchen extension of 20 square metres (24% of the house size) would cost between £30,000 and £60,000.
  • large kitchen extension of 30 square metres (35% of the house size) would cost between £45,000 and £90,000.

Of course, these are only rough estimates and the actual cost of your kitchen extension may vary depending on your specific requirements and circumstances. To get a more accurate quote, you should contact a reputable local builder or architect and discuss your project in detail.

How to Design a Kitchen Extension?

Designing a kitchen extension can be a fun and creative process, but it also requires careful planning and consideration of your needs, budget, and preferences. Here are some key aspects to think about when designing your kitchen extension:

  • The layout: The layout of your kitchen extension should suit your lifestyle and cooking habits, as well as maximise the space and light available. You can choose from different types of layouts, such as L-shaped, U-shaped, galley, island, or peninsula, depending on the shape and size of your extension. You should also consider the position and size of your windows, doors, appliances, cabinets, countertops, and sink, and how they will affect the flow and functionality of your kitchen.

  • The style: The style of your kitchen extension should reflect your personality and taste, as well as complement the existing architecture and décor of your home. You can choose from a wide range of styles, such as modern, traditional, rustic, industrial, or Scandinavian, depending on your preference. You should also consider the colour scheme, materials, textures, and lighting of your kitchen, and how they will create the mood and atmosphere you want.

  • The features: The features of your kitchen extension should enhance the comfort, convenience, and value of your kitchen. You can choose from various features, such as skylights, bi-fold doors, underfloor heating, smart appliances, or a breakfast bar, depending on your budget and needs. You should also consider the storage, ventilation, and safety of your kitchen, and how they will affect the usability and efficiency of your kitchen.

Tips and Inspiration for Your Kitchen Extension

To help you get started with your kitchen extension project, here are some tips and inspiration for your kitchen extension:

  • Use online tools and resources: You can use online tools and resources, such as Pinterest, Houzz, or Instagram, to find and save ideas for your kitchen extension. You can also use online calculators, planners, or simulators, to estimate the cost, size, and design of your kitchen extension.

  • Visit showrooms and exhibitions: You can visit showrooms and exhibitions, such as the Ideal Home Show, the Homebuilding and Renovating Show, or the Grand Designs Live, to see and compare different products, materials, and designs for your kitchen extension. You can also get advice and feedback from experts and professionals in the industry.

  • Hire a professional: You can hire a professional, such as a builder, an architect, or an interior designer, to help you plan, design, and execute your kitchen extension. A professional can offer you valuable guidance, expertise, and experience, as well as save you time, money, and hassle.


A kitchen extension is a great way to improve your home, whether you want to create more space, functionality, or value. However, a kitchen extension also requires careful planning, design, and execution, as well as a realistic budget and expectations. By following the tips and inspiration in this guide, you can achieve your dream kitchen extension that suits your needs, preferences, and style.

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