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House Extensions London 

MB Master Builders Ltd. - The Best Construction Company for your House Extension Project in London

Expanding your London home does not only give you more space, but it also increases the value of your property. We at MB Master Builders have been providing our clients in London and Hertfordshire with various types of building services for over ten years. In this time, we have completed a number of bespoke house extensions, including rear, side return, wrap around and kitchen extensions. Our building company operates under fully insured conditions and with the accreditation of the Federation of Master Builders. Our partnership of experienced builders, award-winning architects and interior designers offers you a hassle-free approach to expanding your living space.

To begin with the project, we will do a free no obligation on-site assessment. A member of our design team will help you with the planning application and the layout of your project if needed. However, if you have already hired an architect, we can still complete the work while following your existing drawing plans and specifications. Within a couple of days after the initial assessment, we will provide you with a detailed estimate and schedule of works. One of our team members will discuss the evaluation with you, to make sure that you understand every item on the list and to avoid any possible future confusion.

If you decide to go ahead, our team of expert London builders will then get to work on your home extension as soon as possible, so your new bespoke living space is completed to the highest standards and within the set deadline. During the work, we strive to keep the site secure and as clean as possible to cause minimum disruption to your daily life. Upon completion, we will provide you with Gas and Electrics Certificates and other required documents, as well as a 15 years structural warranty. We are fully insured, so that you can rest assured that should anything ever go wrong, we will fix it free of charge. 

Recently Completed House Extensions

Contemporary Rear House Extension in North London

Modern Rear House Extension in Barnet

Large Lounge, Dining Room and Kitchen Extension in Mill Hill North West London with Sliding Glass Doors

Contemporary House Extension in Mill Hill

Contemporary Two-storey House Extension with Sliding Glass Doors and Glass Bridge in Hampstead, London

Two-storey Extension in Hampstead

Types of House Extensions

When it comes to extending your London or Hertfordshire home, there are many options from which to choose. And, thanks to the permitted development rights, which has recently been permanently extended by the government, you won't usually need to apply for planning permission unless your proposed extension significantly alters the look of your existing property. Below we have outlined the various types of house extensions available, to give you an idea of what's involved, the costs, and how they’ll transform your home. 

Single Storey House Extension

Single storey extensions have been gaining popularity amongst homeowners in London, as they can visually connect the house with the garden when using sliding glass doors or panels. They come in three different types - rear extensions, side return extensions and wrap around house extensions (which are effectively a combination of both the rear and the side extensions). You could use your new space to accommodate a larger kitchen, stylish living room or even a home office.

Double Storey House Extension

A double storey extension is a cost-effective option, allowing you to double your space under the same roof (which tends to be the most expensive parts of the build). Two storey extensions are typically used to create an open plan kitchen, dining and sitting area with sliding or bi-fold glass doors allowing access to the garden on the lower half. The second half can become anything you like, such as a large family bathroom, additional bedroom, library/study or even a gym.

Over-structure Home Extension

A clever way of using an existing building, such as a previous single storey kitchen extension or an attached garage, is to create a new extension on top of it. This type of home extension project is ideal if you want to add a large en-suite bedroom or a playroom for the children to your home. It can prove one of the most expensive types of extension though in the event the existing structure has single-skin brickwork (in which case more work would be required to strengthen it).

Types of House Extensions London - Rear House Extension
3D Render of a Single Storey Wrap Around House Extension in London

Single Storey Wrap Around House Extension

3D Render of a Double Storey House Extension with a Single Storey Rear Extension in London

Doube Storey House Extension with a Singe Storey Extension at the back

3D Render of an Over-Structure House Extension in London

Over-Structure House Extension with a Singe Storey Extension at the back

  • What is the Average Cost of a Single Storey House Extension or a Kitchen Extension in London?
  • Around £1,900 per sq m for basic quality

    Around £2,200 per sq m for avarage quality

    Up to £3,200 per sq m for top quality

  • What is the Average Cost of a Double Storey House Extension in London or Hertfordshire?
  • Around £1,500 per sq m for basic quality

    Around £1,800 per sq m for avarage quality

    Up to £2,400 per sq m for top quality

  • What are the Benefits of adding a House Extension or a Kitchen Extension to your Home?
  • As well as the obvious advantages for you and your family of an extension, such as more space to co-habit in, it will also add light to the existing structure (thanks to all that glass), making it feel like a space you’ll all want to gravitate too. This can help make your home feel more communal. Financially, yes, an extension can be a lot of money to fork out, but you will undoubtedly get your money back when it comes time to sell and move on, since it will most certainly have added to the value of your home.

    Are you thinking about building a house extension but haven't yet quite decided what you would use your newly gained space for? To provide you with some inspiration, we have put together a list of bespoke ideas on how to turn an ordinary room into an extraordinary living space where the whole family will love spending their free time and which all your friends will want to visit regularly.

    Contact Details

    Call Us:  0208 200 2327


    Our Office

    Kingsbury House 
    468 Church Lane
    NW9 8UA