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We specialise in everything from interior design to garden landscaping, offering customised designs for homes and gardens alike.


Working with top-class architects and contractors, BGR offers construction services, including timber-frame design, home extensions, and garden transformations.

Single Storey Extensions: What You Need To Know

Keep reading our comprehensive guide to single-storey extensions – from planning and design through to construction and costs – to discover all you need to know.

What is a single-storey extension?

A single-storey extension is a ground-floor extension that expands a property horizontally to create more space on one level. It involves extending the footprint of buildings, often across the whole rear width and sometimes wrapping around the side. Its flexibility means single-storey extensions can create large kitchens, combined kitchen/dining areas, living spaces, homes, offices, play areas and more – they’re the ultimate in customisable living spaces – all without the cost and complexity of a multi-storey addition.

What are the main benefits of a single-storey extension?

Added space

One of the primary benefits of a single-storey extension is that it offers additional space. By extending outwards, homeowners can expand their living area without encroaching on outdoor space or altering the flow of their property. This extra space is perfect for expanding families, creating versatile living areas, and enhancing the property’s functionality.

Increased home value

Adding square footage, improving functionality and increasing the home’s appeal can significantly add value. Often, well-designed and built extensions can offer a solid return on investment. Single-storey extensions that are in keeping with the original building and don’t overshoot the amount of land available are very saleable and can raise the price of your home by more than it costs to build the extension.

Enhanced lifestyle

A single-storey extension can transform your lifestyle by providing the additional space you need to create a space that meets your needs perfectly. From creating a spacious kitchen for entertaining or accommodating to a dedicated home office to enable remote working, extending can help you create extra space and a more comfortable living environment.

Planning your extension

Initial considerations

When planning a single-storey extension, several initial considerations are essential:

  • Assess needs and goals for the extension

  • Check local planning regulations and obtain permits

  • Evaluate available space, considering orientation and access

  • Consider existing structural elements and how the extension will integrate

  • Determine budget and establish a timeline for the project

  • Consult with professionals, such as architects and contractors, for guidance and expertise

  • Develop a comprehensive plan that aligns with your vision and meets regulatory requirements
Planning your extension

Navigating planning permissions

Securing planning permission typically involves introducing the proposal to your local planning authority as an application. This is generally required if the extension is likely to alter the property’s external appearance or impact neighbouring properties.

Your starting point should be to consult your local authority’s planning policies and guidelines to establish what’s acceptable. You’ll then need to prepare detailed drawings and other documents explaining the proposed extension’s design, dimensions and specifications. While planning officers take these away to process your application, it may help your case to engage neighbours in discussions to identify any concerns they might have.

Building regulations for a single-storey extension

Single-storey extensions in the UK must comply with the building regulations, which are in place to ensure structural strength, energy conservation and accessibility. In meeting the building regulations for a new extension, the following key areas are covered:

  • Structural integrity: The design and materials used for the extension’s structure will need to meet the building standards for stability and safety.

  • Fire safety: The design and the materials used should provide adequate protection and escape routes to prevent fire spread and allow occupants to escape safely.

  • Thermal performance: To ensure the insulation levels will meet the required standard to help reduce energy usage and heat loss through walls, windows and roofs.

  • Ventilation: To ensure that there is adequate background and rapid ventilation where needed to maintain good indoor air quality and to prevent internal condensation.

  • Accessibility: For any disabled people, if applicable, to ensure that they can gain access and use the building and its facilities.

How long does a single-storey extension take to build?

Building a single-storey extension can take as little as a couple of months, depending on the size and complexity of your property, the weather, and builder availability. On average, a they take around 3 to 6 months, but larger, more intricate builds may take longer.

How long does a single-storey extension take to build?

How much value does a single-storey extension add to a property?

The value added by a single-storey extension depends on various factors such as location, size and quality, with well-designed extensions able to add anything from 5% to 20% to a property’s value. This figure is, however, highly variable.

In an area of high demand and limited housing stock, an extension that’s been thoughtfully and expertly executed could well command a higher premium. In a saturated market, its impact on value might be less clear-cut. Understandably, owners are best advised to consult local specialist estate agents who can provide insights into the true impact extended living spaces are likely to have on the specific market dynamics and trends affecting property values in their area.

Key takeaways

In conclusion, single-storey extensions provide homeowners with an adaptable solution for expanding living space, enhancing the functionality of their property, and boosting its market value. With the right planning and execution, these extensions can make a home more suited to changing needs and contemporary lifestyles, whether that’s more room for family gatherings, a cute home office or a modern kitchen connected to the garden.

A professionally designed, thought-through extension can make all the difference. For expert guidance and custom design solutions that are tailored to your extension project, you need BGR Designs. Why not contact us now to arrange a consultation and start the process of turning your extension dreams into reality?