Single storey side extensions offer a practical and cost-effective way to expand your living space. Whether you’re looking to add a new kitchen, create a spacious living area, or build a utility room, this comprehensive guide covers everything you need to know about planning and building your side extension.
Single Storey Side Extension Examples and Design Ideas
One of the most enjoyable aspects of planning a side extension is deciding on the layout, design, and finishing touches. Here are some popular ways to design and utilise your single storey side extension to maximise both functionality and aesthetics.
Transform Your Kitchen with a Side Extension
Kitchen extensions have become increasingly popular in recent years as homeowners seek to create more spacious, modern cooking and dining areas. Extending your kitchen to the side provides valuable additional space that’s perfect for entertaining guests, creating a welcoming atmosphere, or enjoying family meals together.
A well-designed side extension kitchen can include dining areas with plenty of natural light, modern appliances, and seamless integration with your existing home. This type of extension works particularly well for families who love cooking and entertaining, transforming a modest amount of new space into a hub of activity and connection.
Create a Stunning Living Area
A beautiful, spacious living room is a valuable addition to any home. With thoughtful design and layout planning, you can transform your living area into an impressive space perfect for spending quality time with family and friends, or enjoying peaceful moments alone.
Modern side extension living rooms often feature broken-plan designs that combine multiple functional zones, glass ceiling elements with exposed frameworks for added visual interest, and extensive glazing to maximise natural light. These features create a sense of space and openness while maintaining practical separation between different living areas.
Add a Utility or Storage Room
Your side room extension can also serve practical purposes such as a utility room, storage area, or additional bathroom. The specific use depends entirely on your family’s needs and lifestyle. Whether you need space for laundry equipment, a secondary bathroom, storage for household items, or a dedicated workspace, a side extension provides flexibility.
If you’re planning a utility room, it’s essential to discuss requirements with your architect or builder regarding additional plumbing, electrical connections, and ventilation systems that may be necessary.
Maximise Natural Light
Regardless of how you plan to use your extension—whether as a kitchen, living area, or multi-purpose room—make the most of natural lighting by incorporating skylights, roof lanterns, or large glazed doors. When effectively utilised, natural light creates striking visual effects, opens up the room, and gives the space the impression of being significantly larger than it actually is. This not only enhances the aesthetics but also improves energy efficiency and wellbeing.
How Much Does a Single Storey Side Extension Cost?
Understanding the cost of a single storey side extension is important for budget planning. However, providing a specific figure is challenging because numerous factors influence the final cost of your project.
Key Factors Affecting Extension Costs
- Size of the extension: Larger extensions require more materials and labour
- Materials used: Premium materials cost more than standard alternatives
- Location of your home: Property location significantly impacts costs
- Purpose of the extension: Different uses may require specialised installations
- Quality of finishing: High-end finishes and bespoke features increase costs
- Structural requirements: Ground conditions and existing structures affect costs
- Complexity of design: Intricate designs require more skilled labour
Cost Estimates by Region
In London: Costs typically range from £45,000 to £195,000 depending on the factors listed above.
Outside London: Costs generally start from around £37,000.
Please note that these are rough estimates based on average market rates. Your actual project costs may vary significantly depending on your specific requirements and circumstances.
For a more accurate assessment of your project’s potential cost, it’s advisable to contact experienced builders who can provide detailed quotations based on your specific plans and requirements.
Building Regulations for Single Storey Side Extensions
Before commencing construction on your side extension, you must obtain building regulations approval. You can apply for this through either your local authority service or through an approved inspector. Working with an approved inspector is often recommended as the process is typically faster and more streamlined.
What Building Regulations Cover
Building regulations ensure that your extension meets safety standards and doesn’t pose any hazards to inhabitants or the environment. They cover essential aspects including:
- Drainage and water management systems
- Insulation and thermal performance
- Sound proofing and acoustic performance
- Structural integrity and safety
- Fire safety measures
- Waste management provisions
- Access and accessibility requirements
- Electrical safety and installations
- Ventilation and air quality
Compliance with building regulations is not optional and is legally required for all construction work. Failing to obtain approval can result in enforcement action and may affect your property’s resale value and insurability.
What Planning Permission Do I Need for My Side Extension?
Many single storey side extensions can be built under permitted development rights. This means you may not need to submit a full planning application if your project meets specific criteria set by your local authority. However, you’ll still need written confirmation from your local authority that your development qualifies as permitted development.
Permitted Development Criteria for Side Extensions
To qualify for permitted development, your side extension must meet all of the following criteria:
- Height restriction: The extension cannot exceed four metres in height
- Single storey only: The side extension can only be one storey
- Location requirement: The proposed extension must not be located between the house and a highway
- Width restriction: The extension must not exceed half the width of the original house
- Material compliance: Exterior materials should be similar to the existing property
- Roof design: The roof should normally be pitched if the main property has a pitched roof
When You May Need Full Planning Permission
Even if your extension meets the standard criteria, there are specific circumstances where permitted development rights don’t apply, and you’ll need to apply for full planning permission. These situations include:
- Properties that are apartments or flats
- Maisonettes
- Listed buildings or listed properties
- Homes located in conservation areas
- Properties in areas of outstanding natural beauty
- Properties subject to Article 4 Directions
It’s essential to check with your local planning authority to determine whether your specific property and proposed extension will require full planning permission. They can provide definitive guidance based on your property’s location and designation.
The Extension Process: From Concept to Completion
Taking your home extension from initial concept through to completion can be complex and overwhelming, especially if you’re managing it alone. There are numerous considerations including planning, building regulations, design, financing, and contractor selection.
The journey typically involves:
- Initial design consultations with architects or designers
- Planning permission applications (if required)
- Building regulations submission and approval
- Obtaining accurate cost estimates and project timelines
- Arranging project financing if needed
- Selecting and vetting contractors
- Managing the construction process
- Final inspections and sign-offs
Ready to Start Your Extension Project?
Blenheim Constructions specialises in high-quality home extensions and renovations. Our experienced team can guide you through every stage of your project, from initial planning through to completion.
Key Takeaways
- Single storey side extensions offer flexible space for kitchens, living areas, or utility rooms
- Costs vary widely (£37,000-£195,000+) depending on size, materials, and location
- Building regulations approval is mandatory and covers safety and environmental standards
- Many extensions qualify for permitted development, avoiding the need for full planning permission
- Professional guidance ensures your project complies with all regulations and meets your requirements
- Working with experienced builders streamlines the entire process from design to completion