House Extensions London

Home and Kitchen Extension Builders in North London

If you live in London or Hertfordshire, extending your home can give you more space and increases the value of your property too. At Marriott Construction, we offer two types of building packages. Design and Build - when our architect works closely with you to prepare the architectural and structural drawings, and then submits the plans to your Local Authority. Once the application is approved, our skilled construction team will complete your extension to the highest standards. If you already have hired an architect to do the design, we can build your extension following their drawings and specifications. Upon completion, we provide all our clients with ten-year structural warranty and all the necessary building certificates.

With our North London house extension services, our experienced team of extension specialists work with you, taking into account your personal design preferences to create your perfect kitchen or living space. As building contractors, we have developed an extensive range of home extensions project in London, showcasing the bespoke services that we have been providing to our clients by offering a solution to their space problems. The latest projects include a rear house extension in Marriott Road, Barnet, two storey extension in Hampstead, and a kitchen extension in Hadley Wood, North London. 

House Extension Design

When it comes to designing your extension, you will usually be restricted to four basic variations: a single or a double-storey extension with a flat or a pitched roof. To get an idea if your plans are likely to be accepted, take a look around your area to see what types of extensions other people have built. Your design might even qualify under the Permitted Development, in which case you will not need to apply for Planning Permission

Home and kitchen extension are very versatile and comparatively cost-effective, so without having to move or buying another house, you can opt for this kind of renovation and get a new room or the kitchen you have always envisioned.

3D render of a singley storey wrap around extension in Hampstead

Single Storey House and Kitchen Extensions

A single-storey extension is a popular type of home improvement project, as it visually connects the house with the garden. You can choose between a rear, a side return and a wrap-around house extension. (pictured).

While most one storey rear and side extensions qualify under the Permitted Development, wrap around extensions always require Planning Permission. You could use your new space to create a large open-plan kitchen, making a connection with your back garden, a bright lounge area with a fireplace, or your private gym. 

Double storey house extension in Welwyn Garden City, Hertfordshire

Double Storey House Extensions

A double-storey house extension might be more cost-effective than a single storey, as the roof and the foundations usually tend to be the most expensive parts of the build overall. 

You can add a two-storey extension to the back or the side of the property (the latter will usually need to have a pitched roof similar to the existing one in order to comply with planning regulations). You could extend your kitchen, and add an extra bedroom, a playroom for the children, or an office upstairs.

3D Visualisation of your Home or Kitchen Extension Plans

Our clients' satisfaction is our number one priority. We have teamed up with several architects in North London and Hertfordshire, including Alan Cox Associates, to offer an accurate exterior and interior 3D visualisations of your extension plans. Bellow is a 3D walkthrough render of a rear house extension in Barnet, which was turned into reality by our friendly and professional team of building specialists. 

How much does a House Extension Cost?

This type of project is growing in popularity due to the high demand for larger homes. It's an innovative and affordable construction method for the people who decide to add extra space. Different types of house extensions can get you many benefits.

The price will mostly depend on the quality of the finish. While you can build a basic extension for around £1500 per square metre, if you want a high-end finish, the cost can go up to £3500 per sq. m. A high-quality extension can increase the value of your London or Hertfordshire home by up to 25 per cent. 

Our recent house extension projects in London and Hertfordshire

Rear house extension in London Marriott Road

Rear House Extension in Marriott Road, London

Large kitchen extension in London

Kitchen Extension in Barnet, North London

Double storey extension in North West London Hampstead

Two Storey Extension in Hampstead, NW London

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183 Edgware Road


0208 205 8173

We operate across all of North London and North West London including Hampstead, Mill Hill, Finchley, Edgware and Barnet. We also cover parts of Hertfordshire including Bushey, Elstree, Potters Bar, and St. Albans.