Side Home Extension
At Reltic Extend, we know that space in London homes is precious. A side extension is a brilliant way to make use of that narrow strip of land alongside your property, turning it into a bright, practical, and stylish living area that perfectly complements your home.
Whether you want to expand your kitchen, add a light-filled dining space, or create a functional home office, side extensions are a smart solution. They maximise your footprint without taking away from your garden and can completely change the way you live day to day.
Our team takes care of every step – from design and planning through to construction – ensuring your extension not only looks stunning but also adds real value to your property. With clever use of skylights, glazing, and layout design, we’ll create a space that feels bigger, brighter, and tailored to your lifestyle.
Curious about the potential costs? Try our free Cost Calculator to get an instant estimate for your side extension project.
Get Your Free Quote Today
Ready to start your home extension journey? Share a few details with us and we’ll prepare a tailored quote – no cost, no obligation. Let’s bring your vision to life.
Why Reltic Extend is the Right Choice for Your Side Extension
A side extension isn’t just about adding more space – it’s about making the most of areas in your home that often go unused. For many London homeowners, a side return extension is one of the smartest ways to unlock the potential of a narrow alleyway or passage, turning wasted space into a bright and functional part of the house. With thoughtful design, this type of side extension in London can completely transform your home, creating stylish kitchens, modern dining rooms, or relaxed family spaces.
The style of extension that works best for you will depend on your property and your goals. Victorian and Edwardian homes often benefit most from a classic side return design, while contemporary houses may suit layouts that feature skylights, roof lanterns, or bi-folding doors. If you’re exploring your options, you can also take a look at our Kitchen Extensions for more ideas, or browse our wider range of Home Extensions in London to see how we can help reimagine your home.
With Reltic Extend, you’ll enjoy:
- A tailored design service, including full planning and building regulation support
- Modern features such as skylights, roof lanterns, and sliding or bi-fold doors
- Fixed, transparent pricing with no hidden surprises
- A reliable 10-year structural warranty for peace of mind
If your current layout no longer works for your lifestyle, a side extension could be the perfect solution. Whether you dream of a light-filled kitchen diner or a spacious open-plan living area, our expert team will design and build a home extension that feels made for the way you and your family live.
Ready to start your side extension journey? Book your free consultation today today or try our instant Cost Calculator to see how much your project could cost.
Single-Storey Side Extension
A single-storey side extension is one of the most effective ways to transform unused outdoor space into a bright, functional part of your home. By extending into the narrow alleyway beside your property, you can unlock valuable square footage for a new kitchen, dining area, or utility room. This approach is particularly well-suited to London’s Victorian and Edwardian homes, where every metre counts. With the right design, large skylights, or bi-folding doors, a single-storey side extension can completely change the way your home feels and flows. Learn more in our Kitchen Extensions section or try our Cost Calculator.
Double-Storey Side Extension
A double-storey side extension gives you the flexibility to dramatically expand both floors of your property without relocating. On the ground floor, this extension opens up your kitchen and living space, creating a welcoming, open-plan hub for family life. Upstairs, it offers endless possibilities, from new bedrooms to a bathroom, study, or playroom. This type of extension is especially popular in London, where space is limited and every square metre adds huge value. With thoughtful design, roof lights, and modern finishes, a double-storey extension transforms the way you live. Explore options in our Side Extensions or see how our Planning Services can help.
Side Return Extension
A side return extension is a popular solution for terraced and semi-detached homes, especially across London, where narrow alleys beside properties are often underused. By extending into this strip of space, you can create a larger, brighter kitchen or dining room without compromising your garden. Natural light can be maximised with skylights, roof lanterns, or wide bi-fold doors, helping to create an airy and modern atmosphere. This type of extension works brilliantly for Victorian and Edwardian houses, turning wasted areas into stylish living space. Find ideas in our Kitchen Extensions or start planning with our Planning Services.
Popular Features for Your Double Storey Extension
Bright Dining Spaces
Transform narrow corridors into light-filled dining areas. With careful design and glazing, your new space becomes the perfect spot for relaxed family meals, entertaining friends, or enjoying quiet mornings.
Additional Storage
A side extension isn’t just about creating more living area – it’s also a chance to add practical storage or a dedicated utility room. This keeps your main living space clutter-free while adding everyday convenience.
Skylights & Roof Lanterns
Maximise natural light in your side extension with stylish skylights or roof lanterns. These features brighten narrow spaces, making rooms feel more spacious, welcoming, and contemporary – even in traditional London homes.
Our Process
At Reltic Extend, we provide a complete service for side extensions in London – from your initial consultation right through to the finishing touches. Our goal is to make the entire process smooth, transparent, and enjoyable, helping you unlock the full potential of your home.
Every successful project starts with a conversation. We’ll arrange a friendly site visit to understand your goals, assess your property, and explore what’s possible within your budget. This is your opportunity to share ideas for your new kitchen extension, whether it’s a side return, rear extension, wrap-around, or small kitchen extension. We’ll also discuss practicalities like timelines, planning permission, and potential layouts.
Once we’ve agreed on a concept, our architects prepare detailed plans tailored to your property. We’ll also handle the necessary planning applications, building regulations approval, and even party wall agreements if required. Our design team focuses on creating a kitchen extension that balances natural light, functionality, and style – with options such as skylights, bi-fold doors, utility rooms, or a central kitchen island.
Our skilled construction team brings your kitchen extension to life. From foundations and structural work through to electrics, plumbing, and roofing, we manage every aspect of the build with precision. We use trusted materials, follow strict building regulations, and keep you updated throughout. Most kitchen extensions in London take between 8 and 16 weeks to build, depending on size and complexity.
The final stage is about making your kitchen extension truly yours. We’ll install fixtures, fittings, flooring, lighting, and décor to the highest standard, ensuring every detail is finished perfectly. Whether you’ve chosen an open-plan layout with a dining area or a compact design with smart storage, we’ll deliver a polished result that enhances your lifestyle and adds value to your home.
A side extension is one of the smartest ways to add space, natural light, and long-term value to your home – but most importantly, it creates a versatile area your family will enjoy for years to come. At Reltic Extend, we manage everything from planning and permissions to the finishing details, so you can simply focus on imagining the possibilities.
Frequently Asked Questions About Kitchen Extensions
Thinking about a side extension but not sure where to start? You’re not alone – many London homeowners have the same questions before beginning their project. To make things simpler, we’ve put together answers to the most common queries about design options, planning rules, costs, and what to expect during the build.
In many cases, small side extensions fall under permitted development rights, meaning you won’t need full planning permission. However, larger projects or homes in conservation areas usually do require approval. We’ll guide you through the process.
The cost depends on size, design, and finishes, but as a guide, side return extensions in London typically start from around £35,000. We’ll provide a transparent, tailored quote for your project.
Yes – extending your home with a side return or double-storey side extension can significantly increase property value, often making it one of the most cost-effective ways to add space in London.
On average, a single-storey side extension takes 10 – 14 weeks, while larger double-storey projects may take 16 – 20 weeks. We’ll give you a realistic timeline before starting.
Absolutely. Many clients choose skylights, roof lanterns, or bi-fold doors to maximise natural light and create a seamless flow between indoors and outdoors.
If your project affects a shared wall, you may need a Party Wall Agreement. Don’t worry – our team will handle the details and advise you on the best approach.
Experts in bespoke rear, side, wraparound, kitchen, and double-storey extensions across London.
Our Services
Contact Us
- 4th Floor, Silverstream House, 45 Fitzroy St, London W1T 6EB
- 020 3576 2851
- office@relticextend.co.uk