Planning a kitchen extension is one of the most rewarding ways to expand your home, enhance functionality, and increase property value. However, understanding the kitchen extension cost in 2025 is essential before starting your project. This guide breaks down everything you need to know — from design options and costs to modern styles and smart budgeting.
1. What Is a Kitchen Extension?
A kitchen extension adds extra space to your existing home layout, allowing for a larger cooking and dining area. It can range from a small side return extension to a large open-plan rear or wraparound extension. Homeowners across the UK are increasingly choosing kitchen extensions to create modern, light-filled spaces ideal for family life and entertaining.
2. Kitchen Extension Cost UK 2025: Average Prices
The cost of a kitchen extension in the UK varies based on location, materials, size, and complexity. As of 2025, here’s a general guide to help estimate your budget:
| Type of Extension | Average Cost per m² | Total Cost Range |
|---|---|---|
| Small Kitchen Extension (10–15m²) | £2,000–£2,800 | £20,000–£40,000 |
| Medium Kitchen Extension (20–30m²) | £2,500–£3,500 | £50,000–£75,000 |
| Large / Wraparound Extension (30m²+) | £3,000–£4,500 | £80,000–£130,000+ |
| Modular Kitchen Extension | £1,800–£2,500 | £18,000–£50,000 |
| Glass Kitchen Extension | £3,000–£4,800 | £45,000–£100,000+ |
These prices include materials, construction, and basic fittings but exclude high-end kitchen appliances or finishes.
For an accurate estimate, try a Free House Extension Cost Calculator below.
3. Factors Influencing Kitchen Extension Cost
a. Size and Layout
The size of your project is the most significant cost factor. Larger and more complex designs, such as wraparound or double-storey extensions, naturally cost more.
b. Location
Construction prices differ across the UK. Homeowners in London and the South East generally pay 20–30% more than those in the Midlands or North.
c. Materials and Finishes
Premium materials like natural stone, bespoke joinery, and glass walls increase costs but elevate the overall aesthetic and value.
d. Design Complexity
A modern kitchen extension with skylights, bifold doors, or underfloor heating will cost more than a basic side return build.
e. Professional Fees
Don’t forget to factor in fees for architects, structural engineers, and planning permissions — typically 10–15% of the total cost.
4. Modular Kitchen Extension UK: A Cost-Efficient Alternative
A modular kitchen extension offers a faster and more affordable route to expand your space. These pre-fabricated structures are built off-site and installed quickly, reducing disruption and labour costs.
Benefits of modular kitchen extensions:
-
Faster installation (often within weeks)
-
Eco-friendly materials
-
Cost-effective compared to traditional builds
-
Excellent insulation and energy efficiency
This makes modular extensions particularly appealing for homeowners seeking a budget-conscious option in 2025.
5. Small Kitchen Extension Ideas UK
Even a small kitchen extension can transform your home. Clever design and layout are key to making the most of limited space.
Top tips for small extensions:
-
Incorporate large windows or skylights for natural light
-
Use an open-plan layout to connect kitchen, dining, and living areas
-
Choose multi-functional furniture and hidden storage
-
Add a breakfast bar or kitchen island for social space
A small kitchen extension (10–15m²) can typically be completed within 8–12 weeks, making it one of the fastest and most popular home upgrades.
6. Modern Kitchen Extension Design Trends 2025
Modern kitchen extensions in 2025 embrace open spaces, sustainability, and smart living.
Design trends to watch:
-
Glass extensions and skylights to create bright, airy interiors
-
Minimalist finishes with natural wood, concrete, or matte cabinetry
-
Smart kitchens integrated with energy-efficient appliances
-
Indoor-outdoor living, using bifold doors to connect to the garden
A modern kitchen extension UK is not just functional — it becomes the heart of your home.
7. Glass Kitchen Extension UK: Light, Luxury, and Style
A glass kitchen extension is one of the most striking ways to elevate your home’s aesthetic.
Pros:
-
Maximises natural light
-
Creates a seamless garden connection
-
Enhances resale value
Cons:
-
Higher upfront cost
-
Requires quality glazing to maintain energy efficiency
Expect to pay between £3,000 and £4,800 per m², depending on glass type and frame materials. It’s a premium investment but delivers unmatched visual appeal and value.
8. How to Calculate Your Kitchen Extension Cost
Use an Extension Cost Calculator to estimate your project budget accurately. Enter your desired size, materials, and features to get an instant estimate.
👉 Try the Free House Extension Cost Calculator on Blenheim Constructions to receive a tailored quote for your home.
9. How to Save on Kitchen Extension Costs
-
Choose a modular build – saves up to 25% on construction costs.
-
Simplify design – avoid unnecessary complexity.
-
Compare quotes – always get at least three.
-
Opt for mid-range materials – durable yet affordable.
-
Plan early – avoid costly delays or design changes later.
10. Why Choose Blenheim Constructions for Your Kitchen Extension
At Blenheim Constructions, we specialise in bespoke kitchen extensions across the UK. Whether you’re planning a modern glass kitchen extension or a small modular build, our team ensures precision, quality, and transparency from start to finish.
Our services include:
-
Full design and build packages
-
Planning permission assistance
-
Transparent cost breakdowns
-
High-quality materials and craftsmanship
Visit our Extension Cost Calculator to get your free, instant quote today.