How Much Will a Kitchen Extension Cost in 2026?

Published On: 31 March, 20267.5 min read

Toying with the idea of extending your kitchen? 

Whether it’s a growing family, a love of entertaining or simply wanting a more functional layout, kitchen extensions can be really exciting prospects to create new space in your home. 

But before the paint samples and Pinterest boards come to life, there’s one big question most homeowners ask: how much will a kitchen extension cost?

Understanding the cost of building a kitchen extension isn’t always straightforward – in fact, there are multiple factors at play, and prices can vary significantly depending on your choices. 

That’s why we here at West Midlands Building Company have put together this helpful guide – breaking down all kitchen extension prices, what factors you should be considering and all the FAQs we commonly get asked.

Average Cost Of A Kitchen Extension In 2026

In 2026, the average cost of a kitchen extension in the UK typically ranges between £1,800 and £3,500 per m² – depending on specification and complexity. 

For a standard single-storey kitchen extension, which is a popular choice among homeowners looking to enhance their kitchen space, here are some rough price averages you could expect based on square meters (please note, these are averages based on 2026 costs across the whole of the UK):

  • Small extension (15–20m²): £30,000 – £70,000
  • Medium extension (20–30m²): £45,000 – £100,000
  • Large extension (30m²+): £70,000 – £150,000+

Of course, it’s important to remember that these are just averages – everybody’s home is different, and their requirements for a kitchen extension differ, too. The actual cost of a typical kitchen extension depends on several key factors.

Factors That Can Affect The Cost Of Building A Kitchen Extension

Size Of Kitchen

Firstly, the most common type of kitchen extension is a single-storey extension. 

These are generally more cost-effective and less complex than double-storey builds, providing seamless access to gardens, which many homeowners value.

But within the realm of single-storey extensions are many types and sizes – from small to medium to large – and all of which come with their own price points.

  • Small Kitchen Extension (15–20m²)

Ideal for modest homes or terraced properties, a small single-storey extension can dramatically improve your home’s layout without overwhelming your garden space. 

Costs are generally lower overall, but the cost per square metre can sometimes be higher due to fixed expenses, such as design and groundwork.

  • Medium Kitchen Extension (20–30m²)

This is considered the sweet spot for many homeowners. 

Medium-sized kitchen extensions allow for open-plan kitchen-diners or kitchen-living spaces, offering both functionality and comfort. Costs are more balanced, and you’ll also get noticeable lifestyle improvements.

  • Large Kitchen Extension (30m²+)

Perfect if you’re dreaming of a statement space with islands, bi-fold doors, and plenty of natural light, larger kitchen extensions are a luxury – but come at a price.

Larger projects often benefit from economies of scale, but the overall investment is, of course, higher.

Quality

Another important factor when receiving a quote for a kitchen extension is the quality of the materials and finishes you choose. 

  • Basic / Budget Finish

If you’re working within a tighter budget, you can keep costs down with standard materials and simple designs. 

This doesn’t mean compromising entirely, but perhaps being more strategic about where you spend.

  • Mid-Range Specification

A balance between cost and quality, medium-range quality specs including durable worktops, good insulation and modern fixtures. 

Again a sweet spot, this is where most homeowners land if they have budget constraints but still want a polished finish for their kitchen. 

  • Premium / Luxury Finish

High-end materials such as quartz or granite worktops, bespoke cabinetry, underfloor heating and smart home integrations will significantly increase the cost. 

However, they also enhance longevity and overall property value, and they make a significant difference to your kitchen, creating a luxurious feel for day-to-day life.

Location

Where you live plays a significant role in the cost of building a kitchen extension. Labour and material costs vary across the UK, with areas like London and the South East commanding higher prices.

  • London and the South East

In these areas, labour costs are typically higher, and demand for skilled tradespeople often exceeds supply. This naturally pushes prices up, sometimes significantly. 

Material costs can also be slightly elevated depending on availability and logistics.

  • The North

In contrast, the North tends to offer more competitive pricing, both in terms of labour and overall project costs. 

This can make a noticeable difference when budgeting for your extension, especially on larger builds.

  • The Midlands

Similar to the North, the Midlands also tends to offer more competitive pricing. 

Local demand also has an impact. If there’s a shortage of experienced builders in your area, prices may rise due to limited availability. 

On the other hand, areas with a strong network of trusted contractors – like the West Midlands – often provide a better balance of quality and cost.

So while online estimates and averages are helpful, they can only go so far. The most accurate way to understand the typical house extension costs in your area is to speak directly with a local specialist who knows the market inside out – like us here at West Midlands Building Company.

Benefits Of Adding A Kitchen Extension

A kitchen extension isn’t just about space – it’s about transforming how you live in your home.

If you’re still weighing up whether a kitchen extension is worth the cost, here are some benefits homeowners receive when taking the plunge: 

  • Functionality: A well-designed kitchen extension can completely change the flow of your home, making everyday tasks easier and more enjoyable. Suddenly, cooking, dining and socialising all happen in one cohesive space.
  • Property value: A thoughtfully executed kitchen extension can significantly increase your home’s market appeal. Buyers are often drawn to open, modern kitchen spaces, meaning your investment could pay off in the long run. 
  • Cheaper than moving house: When you factor in stamp duty, legal fees, and the stress of relocating, extending your current home can be a far more cost-effective (and less disruptive) option. It begs the question, why leave a home you love when you can improve it instead?

Kitchen Extension Costs FAQs

How Do I Know What My Kitchen Extension Will Cost?

Every project is unique, so the best way to get clarity is to request a detailed quote that includes:

  • Materials
  • Labour
  • Design and planning considerations

At West Midlands Building Company, we offer free, no-obligation kitchen extension quotes so you know exactly where you stand from the start.

What Are The Typical Costs Of A Kitchen Extension In My Area?

Costs vary across the UK, but in short, think of it like this:

  • London and the South East → higher costs
  • Midlands and Northern regions → more competitive pricing

If you’re based in the West Midlands, you’re in a great position to get excellent value for money. For the most accurate estimate, it’s always best to speak to a local expert, like us here at West Midlands Building Company.

Do I Need Planning Permission For A Kitchen Extension?

Not always. Many kitchen extensions fall under permitted development rights, but this depends on the size and scope of your project. 

For a full breakdown, it’s best to explore a dedicated planning permission guide or speak with an expert.

How Long Will My Kitchen Extension Take?

On average, in the UK, a kitchen extension takes 4–8 months to complete from start to end. However, every project is different, so this time can be extended or shortened based on your requirements. 

It all depends on the size, complexity and any unforeseen delays. It’s always wise to plan for some flexibility because, after all, quality work takes time.

Ready To Build Your Kitchen Extension?

Now that you have a clearer idea of how much a kitchen extension costs and the factors that influence pricing, you’re in a much stronger position to take the next step.

Whether you’re still exploring ideas or ready to get started, having the right team by your side makes all the difference. At West Midlands Building Company, we combine experience, transparency, and craftsmanship to bring your vision to life.

We’ve worked on hundreds of kitchen extension projects in the Birmingham and West Midlands area. With over 150 positive Google reviews, we’ve built a reputation as one of the most reliable and customer-focused companies in the region. 

We also offer a variety of finance options, including buy-now-pay-later plans, and at the time of writing, we’re the only provider in the West Midlands to offer finance terms of up to 20 years on conservatory projects.

Ready to build your kitchen extension? Get in touch with one of our friendly team members today to receive a FREE quote and information about next steps.