Learn all about side extensions in London, including planning, costs, design , and regulations. Maximise space and add value to your home with expert guidance.
1. What is a Side Extension?
A side extension involves extending the side of a property, often over an area referred to as a “side return” – a narrow strip of land running alongside a house. This type of extension is common in terraced and semi-detached properties, where space at the front or rear is limited. For many London homes, a side return extension can create a more open, connected space that enhances the flow and function of the home.
2. Why Choose Side Extensions in London?
Side extensions offer multiple benefits for homeowners in London, including:
Maximising space is especially crucial in the capital, where space comes at a premium. A side extension offers a smart solution to add valuable square footage to your home without altering its core layout. Not only does this provide extra room, but it can also significantly increase property value. According to industry reports, well-designed home extensions in London can boost a property’s value by 5% to 20%. Another key benefit is the enhancement of natural light.
By opening up the side of the house and incorporating features like large windows or bi-fold doors, homeowners can invite more natural light into the space, creating a brighter and more inviting atmosphere. Lastly, side extensions are often used to modernize homes, particularly in creating open-plan living spaces that blend kitchen and dining areas, offering a more contemporary and functional layout for everyday living.
3. Types of Side Extensions in London
When planning a side extension in London, there are several common types to consider:
Double-storey side extensions are an excellent way to add substantial space, offering the benefit of increased living areas on the ground floor as well as additional bedrooms or bathrooms upstairs. However, securing planning permission for these types of extensions can be more challenging due to potential concerns over height and neighbouring properties.
In contrast, single-storey side extensions are the most common choice, particularly in densely populated areas like London, where height restrictions are often imposed by local councils. These extensions are ideal for expanding kitchens, dining rooms, or creating open-plan living areas.
Lastly, wraparound extensions combine a rear and side extension, forming an L-shaped design that maximises space and transforms the layout of the home. While they offer the most room for improvement, they also demand careful planning due to their size and the structural considerations involved.
In London, many side extensions can be carried out under Permitted Development Rights, which means you may not need full planning permission. However, there are strict conditions to meet, including:
For larger or double-storey side extensions, full planning permission is typically required. Always check with your local council’s planning department before starting any work to ensure you’re in compliance with London’s planning regulations.
5. Cost of Side Extensions in London
The cost of a side extension in London varies depending on several factors, including the size of the extension, the materials used, and the complexity of the project. On average, homeowners can expect to pay between £1,500 and £3,000 per square metre for a single-storey side extension in London. Other cost considerations include:
Architect fees typically range from 5-10% of the total project cost, depending on the complexity and scale of the extension. This cost covers design work, consultations, and often project management. Additionally, planning application fees, which vary by local council, generally fall between £200-300, a necessary expense to gain approval for your extension. A structural engineer is also essential, especially for double-storey extensions, to assess the stability and safety of the building; their fees are required to ensure the structural integrity of your project. Finally, building control fees must be paid to ensure that your extension complies with UK building regulations, an important step to guarantee that all work meets the necessary safety and quality standards.
6. How to Finance Your Side Extension
There are several ways to finance a side extension in London:
Using savings is often the most straightforward and cost-effective way to fund a home extension. If you’ve been planning for some time, relying on your savings means you can avoid interest rates and the complexities of borrowing, keeping the financial process simple. Another popular option is remortgaging, where many homeowners choose to release equity from their property, particularly if its value has increased over time. This approach can provide a significant amount of funding, often at competitive rates. Lastly, home improvement loans are offered by many banks and lenders, designed specifically for renovation projects. These loans can be a good alternative if remortgaging isn’t suitable, giving you access to dedicated financing for your extension plans.
7. Building Regulations and Party Wall Agreements
In addition to planning permission, your side extension must comply with UK building regulations. These regulations ensure that the new extension is structurally sound and energy efficient. Some key considerations include insulation, fire safety, and structural stability.
If your property shares walls with a neighbour (common in terraced and semi-detached homes), you may also need a Party Wall Agreement. This agreement ensures that any work carried out does not negatively impact neighbouring properties.
When selecting a contractor for your project, it’s important to first check their qualifications. Ensure they are registered with professional bodies such as the Federation of Master Builders (FMB) or the Royal Institute of British Architects (RIBA). These affiliations can provide confidence in their expertise and adherence to industry standards. Additionally, review their past projects by asking for examples of similar extensions they have completed, ideally within London. This will demonstrate their familiarity with local planning regulations and the specific challenges associated with the area. Lastly, it’s advisable to get multiple quotes—at least three—so you can compare both the costs and the services offered by different contractors, ensuring you make an informed decision.
9. Design Considerations: Maximising Light and Space
When designing a side extension, consider ways to maximise light and space, which can make your home feel more expansive. Popular design features include:
Glass roof panels or skylights are an excellent choice for bringing in abundant natural light, especially in narrow side extensions where light can be limited. They create a bright and airy atmosphere, enhancing the overall aesthetic of the space. Another great option for maximizing the connection between indoor and outdoor spaces is the installation of bi-fold or sliding doors. These doors open up the space, providing seamless access to the garden or patio, making your home feel more expansive. Lastly, underfloor heating is an efficient way to maximise floor space by eliminating the need for bulky radiators. It provides warmth evenly throughout the room, ensuring comfort while maintaining a clean, uncluttered design.
10. Final Thoughts: Is a Side Extension Right for You?
A side extension can transform your London property, adding valuable space and enhancing the overall feel of your home. Whether you’re looking to extend a kitchen, create a new living area, or add bedrooms, the potential benefits are significant. However, it’s essential to plan carefully, budget appropriately, and comply with all relevant planning and building regulations.
With the right approach, a side extension can be a rewarding investment in both your home and lifestyle.