10 Popular Townhouse Extensions in London

Home Extensions Kingdon Carpentry & Construction

London’s rich architectural history and the ever-growing need for extra space have led to a surge in townhouse extensions. Homeowners are looking for creative and stylish ways to add value to their property, enhance its functionality, and improve the overall living experience. In this article, we’ll explore Ten Popular Townhouse Extensions in London, their unique features, and the benefits they offer.

Glass Box Extensions

Glass box extensions have become increasingly popular in recent years. These stunning additions are made from glass panels, allowing for an abundance of natural light and unobstructed views of the outdoors.

Benefits of Glass Box Extensions

The primary benefit of a glass box extension is the seamless connection between the interior and exterior spaces, creating a bright and open living area. Additionally, the modern design adds a touch of elegance to the property.

Side Return Extensions

Side return extensions involve extending the property into the narrow alleyway at the side of the house. Commonly found in Victorian and Edwardian townhouses, this type of extension can significantly increase the ground floor living space.

Benefits of a Side Return Extension

By extending the property into the side return, homeowners can create a larger kitchen, dining area, or open-plan living space. The additional space often enhances the property’s value and improves the overall flow of the ground floor.

Rear Extensions

Rear extensions involve expanding the back of the house to create extra living space. They can be designed in various styles, such as single or double-height, and can incorporate different materials like brick, glass, or timber.

Benefits of a Rear Extension

Rear extensions can significantly increase the living area, making them ideal for families who need extra space for a growing household. They can also add value to the property and improve the connection between indoor and outdoor spaces.

Loft Conversions

Loft conversions are a popular way to add an extra bedroom, home office, or living space to a townhouse. This type of extension involves converting the unused attic space into a functional area.

Benefits of a Loft Conversion

Loft conversions can increase the property’s value and provide additional living space without altering the building’s exterior. They also make use of otherwise wasted space and can be customised to suit the homeowner’s needs.

Basement Conversions

Basement conversions involve transforming an existing cellar or basement into a habitable living area. These extensions are becoming more popular in London as homeowners look for ways to maximise their property’s potential without extending the building’s footprint.

Benefits of a Basement Conversion

Basement conversions offer additional living space, such as a home cinema, gym, or guest suite, without altering the property’s exterior appearance. They can also include natural light sources like light wells or sunken courtyards.

Two-Storey Extensions

Two-storey extensions involve adding an extra floor to an existing single-storey extension or building a new extension that spans two floors. These extensions can provide a considerable amount of additional space for growing families.

Benefits of a Two-Storey Extension

A two-storey extension can drastically increase a property’s living space and value. It also offers more design flexibility; homeowners can add bedrooms, bathrooms, or open-plan living spaces across two levels.

Terrace Extensions

Terrace extensions involve extending the property onto an existing terrace or creating a new outdoor living space. These extensions can include features such as a roof terrace, balcony, or outdoor kitchen.

Benefits of a Terrace Extension

Terrace extensions offer homeowners the opportunity to enjoy outdoor living and entertainment. They can also enhance the connection between indoor and outdoor spaces, improve the property’s aesthetic appeal, and increase its value.

Wraparound Extensions

Wraparound extensions combine side return and rear extensions to create an open-plan living space that wraps around the property. This extension type is ideal for homeowners looking to maximise their living area on the ground floor.

Benefits of a Wraparound Extension

Wraparound extensions significantly increase living space and can transform the property’s layout. They also allow for better integration of indoor and outdoor spaces and can add considerable value to a property.

Pod Extensions

Pod extensions are small, standalone structures that sit in a property’s garden. These versatile extensions can serve as home offices, guest rooms, or even private retreats.

Benefits of a Pod Extension

Pod extensions allow homeowners to create additional living spaces without compromising the main property. They can also be designed to match the property’s aesthetic, adding both visual appeal and value.

Green Roof Extensions

Green roof extensions involve installing a living, vegetative roof on top of an existing or new extension. These eco-friendly roofs can provide a range of benefits, including improved insulation and biodiversity.

Benefits of a Green Roof Extension

In addition to their environmental benefits, green roof extensions can improve the property’s energy efficiency, reduce noise pollution, and add visual appeal. They can also increase the property’s value and provide a unique selling point.


Townhouse extensions in London offer homeowners a variety of options to expand their living spaces and add value to their properties. From glass box extensions to green roof extensions, there’s a solution for every need and style preference. By considering factors such as space requirements, budget, and aesthetic preferences, homeowners can choose the perfect extension to transform their townhouse into a dream home.


How long does it take to complete a townhouse extension in London?

The duration of a townhouse extension project depends on the type and complexity of the extension, as well as the planning and construction process. On average, a simple extension can take around 12-16 weeks, while more complex projects may take 6-12 months.

Do I need planning permission for a townhouse extension in London?

Townhouse extensions often fall under Permitted Development rights, meaning planning permission is not required. However, it is essential to check with your local planning authority. Certain extensions may require permission, especially if the property is located in a conservation area or if the extension exceeds specific size limits.

How much does a townhouse extension in London cost?

The cost of a townhouse extension in London varies depending on the type of extension, materials used, and the overall complexity of the project. On average, a simple extension can cost around £1,000 to £2,000 per square meter, while more complex extensions may cost upwards of £3,000 per square meter. Obtaining quotes from multiple contractors is important to estimate your specific project accurately.

Can I live in my townhouse during the extension process?

Homeowners can often continue living in their townhouse during the extension process. However, depending on the scale and complexity of the project, temporary relocation may be necessary. Discussing this with your contractor to determine the best course of action for your situation is essential.

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