House Extensions Surrey – Seven Hills Developments

At Seven Hills Developments, we specialise in designing and building high-quality house extensions across Surrey. A home extension is the perfect way to create extra living space without the hassle of moving. Whether you need a larger kitchen, an extra bedroom, a home office, or a bright open-plan living area, we deliver bespoke solutions tailored to your lifestyle.

Many house extensions can be carried out under Permitted Development Rights, meaning planning permission is not always required.

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How Much Does a House Extension Cost in Surrey?

One of the first questions homeowners ask is, “How much will my extension cost?” The answer depends on the size of the extension, the specification, ground conditions and the level of internal finishes, but having a realistic budget in mind is a great place to start.

As a general guide:

● Single-storey rear extension: From £45,000

● Side return extension: From £50,000

● Wraparound extension: £70,000–£120,000+

● Double-storey extension: From £80,000

● Kitchen extension with structural alterations: Prices vary depending on steelwork, glazing and kitchen specification.

Every home is different, which is why we offer a free, no-obligation site visit and detailed quotation tailored to your property and requirements. Our quotations are transparent, with no hidden costs, giving you complete confidence before work begins.

At Seven Hills Developments, we build high-quality house extensions throughout Surrey that are designed to add valuable living space while complementing the existing character of your home.

Do I Need Planning Permission for a House Extension?

Many homeowners are surprised to learn that not every house extension requires planning permission. Depending on the size and design of the extension, many projects can be completed under Permitted Development Rights.

Planning permission may be required if:

● Your extension exceeds the Permitted Development limits.

● Your property is located within a conservation area.

● Your home is a listed building.

● The design significantly alters the appearance of your property.

Even where planning permission isn’t required, Building Regulations approval will almost always be necessary to ensure the extension meets current standards for structural safety, insulation, drainage and fire protection.

At Seven Hills Developments, we can manage the entire process for you, from recommending trusted architects and structural engineers to liaising with Building Control, ensuring your extension progresses smoothly from concept to completion.

Our House Extension Process

We understand that building an extension is a significant investment, so our aim is to make the process as straightforward and stress-free as possible. From your first enquiry through to the final handover, we manage every stage of the project while keeping you informed throughout.

1. Free Consultation & Site Visit

We begin with a free consultation at your home to discuss your ideas, assess your property and understand exactly what you’re hoping to achieve.

2. Design & Planning

Whether you already have drawings or need help getting started, we work alongside trusted architects and structural engineers to prepare plans, obtain structural calculations and assist with planning applications where required.

3. Detailed Quotation

Once the design is agreed, we’ll provide a clear and transparent quotation outlining the full scope of works so you know exactly what to expect.

4. Construction

Our experienced team completes every aspect of your extension, including foundations, drainage, brickwork, structural steelwork, roofing, windows, insulation, electrics, plumbing, plastering and all internal finishing.

5. Final Handover

Once complete, we’ll carry out a thorough inspection before handing over your finished extension, ready for you and your family to enjoy.

Why Choose a House Extension?

A house extension is one of the most effective ways to increase your living space without the stress and expense of moving home. Whether you need a larger kitchen, an open-plan family room, an additional bedroom or more room for entertaining, an extension allows you to adapt your home to suit your lifestyle.

Many homeowners choose to extend rather than move because it enables them to stay in the neighbourhood they love while avoiding estate agent fees, stamp duty and removal costs.

A professionally designed extension can also increase the value of your property while improving its functionality and energy efficiency. By creating bright, open living spaces with modern glazing and improved layouts, a house extension can completely transform the way you use your home.

At Seven Hills Developments, we specialise in building seamless extensions that blend perfectly with your existing property, creating spaces that look and feel like they have always been part of your home.

Why Choose Seven Hills Developments?

Choosing the right builder is one of the most important decisions you’ll make when planning a house extension. At Seven Hills Developments, we understand that extending your home is a significant investment, which is why we’re committed to delivering exceptional workmanship, honest advice and a stress-free experience from start to finish.

Based in Surrey, we specialise in high-quality house extensions that are built to enhance the way you live. Whether you’re creating a larger kitchen, an open-plan family space, a new bedroom or a double-storey extension, we work closely with you throughout the project to ensure the finished result exceeds your expectations.

When you choose Seven Hills Developments, you can expect:

● Free, no-obligation consultations and detailed quotations.

● Honest, transparent pricing with no hidden costs.

● Experienced and skilled tradespeople committed to quality workmanship.

● Full project management from the initial survey through to completion.

● Regular communication and updates throughout your build.

● High-quality materials and finishes built to last.

● A clean, organised and respectful approach to working in occupied homes.

● Fully insured for your complete peace of mind.

Our reputation has been built on recommendations, repeat customers and delivering projects we’re proud to put our name to. Every house extension we complete receives the same attention to detail, regardless of its size or complexity.

Whether you’re planning a single-storey extension, a rear extension, a side return extension or a double-storey extension, Seven Hills Developments is committed to creating additional living space that complements your home while adding lasting value.

House Extension Builders Across Surrey

Seven Hills Developments is proud to provide professional house extension services throughout Surrey and the surrounding areas. We work with homeowners looking to transform their properties by creating beautiful, practical living spaces that are tailored to their lifestyle and built to the highest standards.

We regularly complete house extension projects in:

● Cobham

● Esher

● Epsom

● Ewell

● Ashtead

● Leatherhead

● Bookham

● Oxshott

● Weybridge

● Walton-on-Thames

● Guildford

● Reigate

● Banstead

● Dorking

● Kingston upon Thames

● Claygate

● Chessington

From contemporary kitchen extensions and open-plan family spaces to double-storey extensions and complete home transformations, our experienced team delivers high-quality workmanship across every project.

If your town isn’t listed above, we’d still be delighted to discuss your project. We work throughout Surrey and neighbouring areas, so please get in touch to arrange a free consultation and discover how Seven Hills Developments can help bring your plans to life.

Frequently Asked Questions

How much does a house extension cost in Surrey?

The cost of a house extension depends on several factors, including the size of the extension, the type of construction, ground conditions and the level of internal finishes. Following a free site visit, we’ll provide a detailed quotation tailored specifically to your project.

Do I need planning permission for a house extension?

Many house extensions can be built under Permitted Development Rights, although larger extensions, listed buildings and properties within conservation areas may require planning permission. We’ll advise you on the requirements for your property and can manage the application process if needed.

How long does it take to build a house extension?

Most single-storey extensions take approximately 10 to 16 weeks to complete, while larger or more complex projects may take longer. We’ll provide an estimated programme before work begins so you know what to expect.

Can I continue living in my home during the build?

In most cases, yes. Many homeowners remain in their property throughout the construction process. We carefully plan each stage of the build to minimise disruption and maintain a safe, clean working environment.

Will a house extension add value to my property?

A well-designed and professionally built house extension can significantly increase both the value of your home and the amount of usable living space. It can also make your property more attractive to future buyers while improving your day-to-day lifestyle.

Can Seven Hills Developments manage my project from start to finish?

Yes. We offer a complete design and build service, working alongside trusted architects, structural engineers and Building Control to manage every stage of your extension from the initial consultation through to final completion.

What types of house extensions do you build?

We specialise in single-storey extensions, rear extensions, side return extensions, wraparound extensions and double-storey extensions. During your consultation, we’ll recommend the most suitable option based on your property and your goals.

Which areas do you cover?

We build house extensions throughout Surrey, including Cobham, Esher, Epsom, Leatherhead, Guildford, Weybridge, Banstead, Reigate and the surrounding areas. If you’re unsure whether we cover your location, please get in touch and we’ll be happy to help.

Types of House Extensions in Surrey

We provide a full range of extension options to suit your property and requirements:

Single-Storey Extensions Surrey

The most popular type of extension, a single-storey rear or side extension is ideal for creating spacious kitchens, dining areas, or family rooms filled with natural light.

Double-Storey Extensions Surrey

A two-storey extension adds significant space both upstairs and downstairs, perfect for growing families who want more bedrooms, bathrooms, and living space.

Side Return Extensions Surrey

Transform unused side alley space into a stylish side return extension, commonly used in terraced homes to expand kitchens and create open-plan living areas.

Wraparound Extensions Surrey

A wraparound extension combines a rear and side return, maximising space and offering incredible flexibility for larger, modern layouts.

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Our Extension Services

We offer two flexible service options:

• Design & Build Package – From architectural design, planning, and structural engineering through to full construction.

• Construction-Only Package – Already have drawings? Our expert team can handle the build from start to finish.

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Why Choose Seven Hills Developments?

• Local Surrey-based specialists in house extensions

• Full project management for a stress-free experience

• Skilled in modern, traditional, and bespoke extension designs

• Fully insured, with all work meeting building regulations

• Transparent pricing with no hidden extras

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Start Your House Extension in Surrey Today

If you’re considering extending your home, let Seven Hills Developments turn your vision into reality. From kitchen extensions to full double-storey builds, we provide exceptional craftsmanship and a seamless service.

📍 Based in Surrey, serving homeowners across the surrounding areas