House Extensions in London - Single & Double Storey Extensions

In a vibrant city like London, where space is at a premium and property values are constantly rising, home extensions offer an excellent way to enhance your living space without the need to move.

Whether you're looking to add an extra room, expand your kitchen, or create a new living area, professional home extension services can help you achieve your goals with efficiency and style.

From concept to completion, a well-executed extension not only improves your quality of life but also adds significant value to your property.

House Extensions in London -  Single & Double Storey Extensions
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End-to-End Project Management
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Extensive London Construction Experience
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Customized Construction Plans
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Commitment to Quality
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Innovative Design Solutions
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Sustainability Focus
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Why Consider a Home Extension?

Optimize Your Living Space

As families grow and lifestyles change, the need for more space becomes evident. Home extensions in London allow you to optimize your current living environment, providing additional rooms or expanding existing ones to better meet your needs. Whether you require a larger kitchen, an extra bedroom, or a dedicated office space, extending your home offers a practical solution to accommodate your evolving requirements.

Increase Property Value

Investing in a home extension is a strategic way to boost your property’s market value. Property extensions are highly desirable in London’s competitive real estate market, where additional square footage can make a significant difference. By enhancing your home’s layout and functionality, an extension not only improves your living experience but also makes your property more attractive to potential buyers, increasing its resale value.

Avoid the Costs and Hassles of Moving

Moving to a new home can be a costly and stressful process. Home extensions offer a more economical and less disruptive alternative, allowing you to stay in your beloved neighborhood while gaining the additional space you need. Instead of navigating the complexities of buying and selling property, you can enhance your current home to better suit your needs and preferences.

Types of Home Extensions

Single-Storey Extensions

Single-storey extensions are a popular choice for homeowners looking to expand their living space without altering the overall structure of their home. This type of extension typically involves extending outwards from the existing structure, creating additional space on the ground floor. Single-storey extensions are ideal for enlarging kitchens, living rooms, or creating a new dining area, offering a seamless blend with the existing design of your home.

Double-Storey Extensions

For those seeking more substantial changes, double-storey extensions provide an excellent solution. This type of extension involves adding space on both the ground and first floors, significantly increasing the overall footprint of your home. Double-storey extensions are ideal for adding multiple rooms, such as additional bedrooms or bathrooms, and can dramatically enhance both the functionality and value of your property.

Loft Conversions

Loft conversions offer a creative way to utilize unused attic space, transforming it into a functional and stylish living area. This type of extension is ideal for creating additional bedrooms, home offices, or even a private retreat. Loft conversions are particularly valuable in urban areas like London, where horizontal space is limited, and vertical expansion offers a practical solution to space constraints.

Basement Conversions

Basement conversions are another effective way to expand your living space, especially in properties with existing basements that are underutilized. Converting a basement can create additional rooms such as a home gym, cinema room, or extra storage space. This type of extension not only maximizes your property’s potential but also improves overall functionality.

Conservatories and Garden Rooms

Conservatories and garden rooms provide a unique extension option, blending indoor and outdoor living. These structures are typically constructed using glass or lightweight materials, creating bright, airy spaces that connect seamlessly with your garden or outdoor area. Conservatories and garden rooms are perfect for relaxing, dining, or enjoying the view of your garden throughout the year.

The Home Extension Process

Initial Consultation and Design

The process of home extensions in London begins with an initial consultation, where you discuss your needs, preferences, and budget with a professional designer or architect. During this phase, designers create detailed plans and 3D renderings to help you visualize the proposed extension. This stage is crucial for ensuring that the design aligns with your vision and complies with local planning regulations.

Planning and Permits

Once the design is finalized, the next step involves obtaining the necessary planning permissions and permits. Planning and permits are essential for ensuring that your extension complies with local building codes and regulations. A professional project manager or architect handles the paperwork and liaises with local authorities to secure the required approvals, ensuring a smooth and compliant construction process.

Construction and Project Management

With permits in place, construction begins. Home extension services include comprehensive project management to oversee the construction process. This involves coordinating contractors, monitoring progress, and ensuring that the work is completed to a high standard. Effective project management ensures that the extension is built on time, within budget, and to your specifications.

Interior Design and Finishing Touches

After the structural work is complete, attention turns to interior design and finishing touches. Interior design services focus on selecting materials, fixtures, and furnishings that complement the new space and enhance its functionality. This includes choosing flooring, lighting, and paint colours, as well as installing cabinetry and other fixtures to create a cohesive and stylish finish.

Final Inspection and Handover

The final stage of the home extension process involves a thorough inspection to ensure that all work meets quality standards and complies with regulations. A final walkthrough allows you to review the completed extension, address any issues, and ensure that the space meets your expectations. Once approved, the extension is officially handed over, and you can begin enjoying your newly expanded living area.

Choosing the Right Home Extension Service

Experience and Expertise

When selecting a provider for your home extension project, it’s essential to choose a company with extensive experience and expertise. Look for professionals with a proven track record of delivering high-quality extensions that meet client expectations. Experienced providers offer valuable insights, innovative solutions, and efficient project management, ensuring a successful outcome.

Customization and Design Flexibility

Home extensions should reflect your unique needs and preferences. Choose a service provider that offers customization and design flexibility, allowing you to tailor the extension to your specific requirements. Professional designers work closely with you to develop a bespoke design that enhances your home’s functionality and aesthetic appeal.

Quality of Work and Materials

The quality of work and materials used in your extension project is crucial for achieving a durable and aesthetically pleasing result. Ensure that your chosen provider uses high-quality materials and employs skilled craftsmen to deliver a finished product that meets the highest standards.

Customer Reviews and Testimonials

Research customer reviews and testimonials to gauge the reputation of your chosen home extension service provider. Positive feedback from previous clients provides assurance of the company’s reliability, professionalism, and commitment to customer satisfaction.

Transform Your Home with Professional Extensions

Investing in home extensions in London is a transformative way to enhance your living space and increase your property’s value.

Whether you’re looking to expand your kitchen, add new rooms, or convert unused areas, our professional extension services deliver the expertise and craftsmanship needed to achieve your goals.

By optimizing your existing space, avoiding the costs of moving, and improving functionality, a well-designed extension enhances your home and your quality of life.

Explore the possibilities of home extensions and unlock the full potential of your property with expert guidance and seamless execution.

Transform your home into a more spacious, functional, and valuable asset today.

House extensions in London tailored to your home

Expanding your home with a house extension is one of the smartest ways to add space, functionality, and value—especially in a city like London, where space is at a premium. At London Core Construction, we specialise in delivering bespoke house extensions that reflect your lifestyle and complement the character of your property.

Whether you live in a Victorian terrace, a modern townhouse, or a period property, we create tailored solutions that blend seamlessly with your existing architecture. Our team combines expert craftsmanship with a deep understanding of London’s planning landscape to deliver extensions that are not only beautiful, but practical and fully compliant.

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new house with extension in london

Types of home extensions we build

We offer a full range of house extension types, each designed to meet different needs and property styles. Common options include:

  • Rear extensions – Perfect for opening up kitchen and dining spaces, often leading onto gardens or patios.
  • Side return extensions – Ideal for terraced homes, these unlock narrow alleyways and convert them into functional interior space.
  • Wraparound extensions – A combination of side and rear extensions, offering significant space transformation.
  • Double-storey extensions – Add extra bedrooms, bathrooms, or living areas on two floors, increasing value and space.
  • Loft conversions – While technically different, loft conversions are a popular extension method in London homes.

Each type is carefully designed to suit your property, meet local regulations, and maximise both usability and natural light.

Our expert design and build approach

Our design and build model means everything is handled in-house, from initial concept through to completion. This ensures consistency, accountability, and seamless communication throughout your project. Our process includes:

  • Bespoke architectural design based on your lifestyle
  • Planning and structural approvals managed for you
  • Fixed timelines and clear milestones
  • Skilled, fully insured local tradespeople
  • Quality control checks at every stage

By managing the entire journey under one roof, we reduce delays, lower costs, and maintain the highest standard of finish. Your dream extension is delivered efficiently, on time, and with minimal disruption to your daily life.

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How much a house extension costs in London

The cost of a house extension in London depends on the size, complexity, location, and finishes chosen. As a general guide, extensions typically range from:

  • £1,800 to £2,500 per square metre for basic finishes
  • £2,500 to £3,500+ per square metre for high-end materials and custom designs

Other factors that affect cost include structural work, access to the property, planning conditions, and whether utilities need to be rerouted. At London Core Construction, we provide transparent, itemised quotes after your initial consultation, with no hidden fees. Our goal is to deliver exceptional value while working within your budget.

Benefits of extending your home vs moving

In a fast-moving and expensive London property market, extending your current home often makes more financial and emotional sense than relocating. Key benefits include:

  • Increased space without the stress of moving
  • Enhanced property value through strategic design
  • Custom-built features tailored to your needs
  • Preservation of community ties, schools, and local amenities

Moving costs, stamp duty, and uncertainty in the housing market can make relocating impractical. A well-designed extension adds lasting value and lets you shape your living space exactly how you want it.

kitchen in a modern finished house extension

Planning permission and building regulations explained

Navigating planning permission in London can be complex, but we're here to guide you through every step. Many smaller extensions fall under permitted development rights, meaning they don't require formal planning approval. However, if your property is in a conservation area, is listed, or if you're planning a larger or multi-storey extension, full planning permission will likely be required.

We handle all applications, liaise with local authorities, and ensure your project complies with both planning laws and building regulations. This includes structural safety, insulation standards, fire safety, and accessibility requirements. Our experienced team makes the process stress-free, so you can focus on the exciting parts of your project.

Book a FREE Consultation

Why choose London Core Construction for

House Extensions

in London

engineering
End-to-End Project Management

We handle every stage of your project, ensuring smooth coordination and timely completion.

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Extensive London Construction Experience

With years of experience across London, we understand local regulations, styles, and challenges.

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Customized Construction Plans

Your space, your vision—our team creates tailored plans that fit your needs and lifestyle.

verified
Commitment to Quality

We use premium materials and expert craftsmanship to deliver lasting, high-quality results.

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Innovative Design Solutions

Our creative team brings fresh, functional design ideas to every project we take on.

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Sustainability Focus

We prioritise sustainable materials and energy-efficient methods for a smarter build.

Request a free quote now for a fast, transparent estimate with no obligations.

Get a FREE Quote

Our 5-Step Project Timeline

builder building a new house in London
1

Initial Consultation

Every successful house extension begins with a clear understanding of your vision. In the initial consultation, our team meets with you to discuss your goals, budget, and expectations. We assess your existing property layout and listen to what you want from your new space—whether it’s a larger kitchen, additional bedroom, or open-plan living area. This first step ensures we’re aligned from the outset and allows us to offer expert guidance tailored to your home and planning context in London.

2

Planning & Design

Once we understand your goals, our in-house architects and designers get to work. We develop custom extension plans that blend seamlessly with your existing home while maximizing natural light, space, and function. During this stage, we also assist with planning permission applications, building regulations, and any necessary structural calculations.

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Pre-Construction Setup

Before the build begins, we take care of all the logistics to ensure a smooth execution. This includes finalizing materials, confirming supplier schedules, and preparing the site for construction. We conduct risk assessments, establish timelines, and keep you informed at every stage. Our project managers coordinate all moving parts behind the scenes so that everything is ready to go from day one of the build phase.

4

Build & Execution

With everything in place, our skilled construction team begins work on-site. From structural work and extensions to plumbing, electrical, and finishing details, every part of the build is managed with precision and care. We stick to agreed timelines and budgets while keeping you updated through regular progress reports. Our builders are experienced in working within the constraints of London homes—whether it’s limited access, party wall considerations, or heritage properties.

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new house with extension in london
5

Final Handover

The final step is where your vision becomes a reality. Once construction is complete, we carry out a thorough quality inspection and walk you through every aspect of your new extension. We make sure every detail meets your expectations and address any final adjustments. You’ll also receive all compliance documentation, warranties, and maintenance guidance, ensuring complete peace of mind. Only once you’re fully satisfied do we consider the project complete.

Frequently Asked Questions

Do I need planning permission for a house extension in London?
How much does a house extension cost in London?
How long does a typical house extension take to complete?
Will I need to move out during the extension build?
Can you match the extension to the style of my existing home?
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Whether you have questions about our services, need a quote, or want to discuss your next project, our friendly and knowledgeable team is ready to assist you.

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