Single Storey Rear Extensions: A Complete Guide to Expanding Your Home
Homeowners today are increasingly looking for practical ways to gain more space without the stress and cost of moving. One of the most effective solutions is a single storey rear extension, a design approach that allows you to expand your living space while maintaining the character of your home. Whether you want a larger kitchen, an open-plan dining area, or a brighter family space, a rear extension can completely change how your home functions.
This guide explains everything you need to know about single storey rear extensions, including design ideas, planning considerations, costs, and how they compare with options such as a single story wrap around extension. If you are planning a home improvement project, this article will help you make informed decisions with confidence.
Key Takeaways
- Single storey rear extensions are a practical and cost-effective way to add space
- They improve light, layout, and connection to outdoor areas
- A single story wrap around extension offers even more flexibility where space allows
- Good design and planning are essential for long-term value
- Professional guidance ensures compliance, quality, and efficiency
What Is a Single Storey Rear Extension?
A single storey rear extension is an addition built at the back of a property, extending the existing ground floor space. It is commonly used to enlarge kitchens, dining rooms, or living areas while improving the connection between indoor and outdoor spaces.
Unlike multi-storey extensions, this type of extension keeps the structure low-profile, making it ideal for terraced, semi-detached, and detached homes. It also tends to be more cost-effective and quicker to build.
Many homeowners choose this option because it delivers maximum impact with minimal disruption, particularly when carefully designed by experienced professionals such as Studio20 Architects.
Why Homeowners Choose Single Storey Rear Extensions
There are several reasons why rear extensions remain one of the most popular home improvements:
1. Improved Living Space
A well-designed extension creates a more open and practical layout. Large kitchens with dining and seating areas are now a priority for modern families.
2. Increased Natural Light
Incorporating roof lights, skylights, or large glass doors allows daylight to flood the space, making the home feel larger and more welcoming.
3. Better Connection to the Garden
Rear extensions often open directly onto outdoor areas, improving flow between the home and garden.
4. Added Property Value
When designed and built correctly, a single storey rear extension can significantly increase the value of your property.
Single Storey Rear Extensions vs Single Story Wrap Around Extension
While a rear extension expands the back of the property, a single story wrap around extension extends both the rear and side of the home. This option is ideal for properties with side access, particularly corner plots or semi-detached homes.
Key Differences
Rear ExtensionWrap Around ExtensionExtends only at the backExtends at rear and sideLower construction costHigher cost but more spaceIdeal for terraced homesBest for properties with side accessMinimal external changesGreater design flexibility
Both options can transform a home, but the right choice depends on your property layout, budget, and long-term goals.
Design Ideas for Single Storey Rear Extensions
Thoughtful design is essential to ensure your extension feels like a natural part of your home rather than an add-on.
Open-Plan Living
Open layouts are one of the most popular choices. Removing internal walls and extending at the rear creates a seamless kitchen, dining, and living area.
Flat Roof with Rooflights
Flat roofs paired with rooflights are a practical solution for bringing in natural light while maintaining clean architectural lines.
Pitched Roof Extensions
A pitched roof can blend more easily with traditional properties and offer better drainage and insulation.
Large Glazed Doors
Bi-fold or sliding glass doors allow light to flow in and create a strong visual connection to the garden.
Material Choices
Using complementary materials such as brick, render, or timber cladding helps the extension integrate with the original structure.
At Studio20 Architects, design decisions are guided by both aesthetics and function, ensuring each extension supports modern living while respecting the existing home.
Planning Permission and Building Regulations
One of the advantages of single storey rear extensions is that many fall under permitted development rights, meaning full planning permission may not be required.
Permitted Development Rules
- Maximum depth of 3–4 metres depending on property type
- Height restrictions typically up to 4 metres
- Materials should match the existing property
- No extension beyond the rear boundary
However, planning permission may still be required in conservation areas or for larger extensions. Building regulations approval is always necessary to ensure safety, insulation, and structural standards.
Consulting experienced architects early in the process helps avoid delays and ensures compliance from the start.
How Much Does a Single Storey Rear Extension Cost?
Costs vary depending on size, materials, location, and design complexity. As a general guide:
- Basic build: £1,500–£2,200 per square metre
- Mid-range finish: £2,200–£2,800 per square metre
- High-end design: £3,000+ per square metre
Additional costs may include:
- Architectural design and planning
- Structural engineering
- Party wall agreements
- Interior finishes and fittings
While budget is important, focusing solely on cost can compromise long-term value. Well-designed extensions often pay for themselves through improved lifestyle and increased property worth.
Common Mistakes to Avoid
Many extension projects encounter issues due to lack of planning or professional guidance. Avoid these common mistakes:
- Underestimating the total budget
- Poor lighting design
- Ignoring storage needs
- Choosing unsuitable materials
- Failing to consider future resale value
Working with experienced professionals like Studio20 Architects helps prevent these issues and ensures a smooth project from concept to completion.
Sustainability and Energy Efficiency
Modern rear extensions should not only look good but also perform well. Sustainable design choices include:
- High-performance insulation
- Energy-efficient glazing
- Low-energy lighting
- Improved ventilation
These features reduce running costs and create a more comfortable living environment.
Frequently Asked Questions
Do single storey rear extensions add value?
Yes. A well-designed extension can significantly increase property value, particularly when it improves kitchen and living areas.
How long does construction take?
Most projects take between 10 and 16 weeks, depending on size and complexity.
Can I live in my home during construction?
In many cases, yes, although some disruption should be expected during key stages.
Is planning permission always required?
Not always. Many rear extensions fall under permitted development, but professional advice is recommended.
Ready to Expand Your Home?
A carefully planned rear extension can completely transform how you live in your home. If you are considering a single storey rear extension or a single story wrap around extension, working with experienced architects ensures the best possible outcome.
Studio20 Architects specialise in designing thoughtful, high-quality residential extensions that balance functionality, style, and long-term value.
👉 Start Planning Your Home Extension Today
Explore how a well-designed rear extension can enhance your living space and add lasting value to your home.