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Home Extensions
Expand Your Living Space

Feeling like there's not enough room in your London home?
Need that extra office to work from home, more living space, or even extra bedrooms?

CVI Builders offers affordable and cost-effective home extensions in London, including roofs, kitchens, gardens and conservatories.

Our team has extensive experience and knowledge of building extensions in all shapes and sizes, across a wide range of buildings.

You can check out different types of extensions below.

Extensions are a perfect way to make your home bigger, without the need or hassle of relocating.


We construct uniquely designed property extensions allowing you to benefit from your new space, in the way that suits you best.


Extensions are also a great way to increase your home's value, which can be ideal if you plan to sell your place in the future.

We work with our customers to create a perfect design for your new extension, allowing you to choose the size, layout, decor and key features.


This means, that with our team, we can bring your ideas to life.

If you're interested, get in touch for a free estimate.

  • Loft and basement conversions repurpose underutilised spaces into functional rooms.

    A loft conversion transforms the attic into bedrooms, offices, or playrooms, while a basement conversion creates additional living areas, gyms, or home cinemas/'man caves'.

    These conversions make the most of your existing space without altering the property's footprint.

  • A single storey extension adds or expands a room on the ground floor.

    This is ideal for new kitchens, living rooms, or home offices.

    This type of extension is versatile, fitting various needs and increasing your living space without the complexity of multiple floors.

    It offers a cost-effective way to increase your home's usability and value.

  • A double-storey extension provides additional space on both the ground and upper floors.

    This is perfect for extra bedrooms, bathrooms, or larger living areas.

    Our expert team can offer this solution for growing families or those who just find themselves needing more space.

  • A wrap-around extension combines a rear and side return extension, creating an L-shaped addition to your home.

    This massively increases ground floor space, allowing for much larger kitchens, open-plan living areas, or additional rooms.

    It provides a seamless flow between indoor and outdoor spaces, giving a clean and modern look.

  • A side return extension maximises the use of the area along the side of your house, often transforming it into a larger kitchen or living area.

    This extension uses as much of your available space without sacrificing on the size of your garden space.

    It offers a practical solution for creating a more open and functional living area, increasing both space and value.

  • A rear house extension adds valuable space to the back of your home, for your kitchen, living room, or creating a new dining area.

    It increases your living space without altering the front appearance of your home.

    This extension can improve your lifestyle by providing a more spacious and comfortable environment.


We cover all aspects of building services in London:

  • Structural Design & Calculations

  • Building Project Management

  • Home Extensions

  • Roof Extensions

  • Loft Conversions

  • Home Refurbishments

  • Home Renovations

  • Kitchen & Bathroom Installations

  • Window & Patio Doors

  • Plastering & Skimming

  • Flooring & Tiling

  • Commercial & Residential New Builds

  • How long will an extension or renovation project take?
    This will depend on the overall size and complexity of your project. During our free consultation together, we will cover your specific needs and provide a more accurate timeframe. However, we'll always keep you informed throughout the entire process and make you aware of any expected delays.
  • Will my neighbours complain about my extension?
    When it comes to house extensions, your neighbours should be one of your top concerns. It will pay off in the long run, if you keep them happy, informed and take time to listen to any worries they may have. We're well experienced in these kind of conversations and can help out or advise at any time.
  • Where do you cover?
    We can cover all areas in London. If you're outside London, please get in touch to make sure you're covered, and we will let you know.
  • Why choose a general contractor and not a builder?
    A general contractor like us, will take care of your whole building project, whatever needs doing. We will expertly select sub-contractor builders to carry out specific tasks under our guidance and project management.
  • How do you work? What's your process?
    As you'll see from our reviews, we keep you on-board every step of the way. Here's a quick run-down of how the projects usually work: 1.Consultation: We chat over the phone about your project, or come and visit your property to understand exactly what you're looking for, and help you to choose the best solution to fit your needs. 2.Design & Planning: We develop completely bespoke designs for you that make the most out of your available space and fit the style and feel you're looking for. 3. Party wall notice: During the planning application, you will have to submit a Party Wall Notice to your neighbours. We recommend doing this as early as possible so that there are as little delays as possible in receiving permission from your local authorities. We can help you through this entire process. 4.Permits & Approvals: We handle the structural and architectural engineering, making all of the necessary calculations to support your home improvements. Our team will provide an idea on ta rough timescale during the consultation. 5.Construction: Our experienced team gets to work, treating your space as if it was their own, we make sure that everything is completed to your satisfaction and troubleshoot alongside you.
  • Do you offer a free consultation?
    Definitely! We believe in giving you the right information any time. Our free consultations are a great opportunity to understand exactly what you're looking to achieve with your home or commercial projects. It's a chance for you to ask any questions you might have and get a feel for our team.
  • How much does an architect cost to hire in the UK?
    Depending on your project and location, the cost will vary, typically between 5 and 10% of the total project cost. For example, if you're looking to get a traditional rear extension in London, the project cost could be around £50k. Meaning that your architect fir, could cost anywhere from £2500 to £5000. This is a rough guide based on typical industry recommendation.
  • Do you offer any financing plans or options?
    While we don't directly offer and financing options, we can definitely help you to explore different options that might work best for you, based on the hundreds of projects we've worked on in the past.
  • Do you do renovations?
    Yes, we also offer full interior renovations, from bathroom tiling to staircases.
  • Can I design my own project without an architect?
    You're not legally obliged to hire an architect. However, an architect will help you get the most out of any significant project like extensions, new builds or conversions. Architects will ensure that your design complies with all legal requirements, avoiding potential fines and supporting in selecting the ideal contractors to use.
  • How do I add a new question & answer?
    To add a new FAQ follow these steps: 1. Manage FAQs from your site dashboard or in the Editor 2. Add a new question & answer 3. Assign your FAQ to a category 4. Save and publish. You can always come back and edit your FAQs.
  • How do I edit or remove the 'Frequently Asked Questions' title?
    You can edit the title from the FAQ 'Settings' tab in the Editor. To remove the title from your mobile app go to the 'Site & App' tab in your Owner's app and customize.
  • Can I insert an image, video, or GIF in my FAQ?
    Yes. To add media follow these steps: 1. Manage FAQs from your site dashboard or in the Editor 2. Create a new FAQ or edit an existing one 3. From the answer text box click on the video, image or GIF icon 4. Add media from your library and save.

We carefully plan all of our projects down to the finest details. From material selection to timelines.


We provide project details an payment schedules that are clear and easy to understand

Our Offer

Our site managers are transparent, approachable and always on-call to answer any questions. 

We're on this journey together.


Rest assured that the team assigned to each bespoke project, are fully certified for tasks at hand.


Our team are proud of what they do, no matter what project. They will treat your space, as if it is their own.

Quality - Every Time

With hundreds of 5 Star reviews across the likes of Google and CheckaTrade, we have a history to rely on. Check out our work.


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