Choosing the Perfect Extension Type for Your UK Home

What extensions add the most value to a home? Is an extension worth it in the UK? What size extension can I put on my house? These questions often pop up when considering a home extension. Extensions can significantly impact your home’s value and enhance its functionality.

While some people might see them as an afterthought, they are worth every investment and offer countless benefits, such as:

• Increased Living Space

Extensions provide more room for your family to grow and for various activities, whether it’s a new bedroom, a larger kitchen, or a home office.

• Enhanced Property Value

A well-planned and executed extension can significantly boost your home’s market value. Potential buyers often look for homes with additional living spaces.

• Improved Aesthetics

Modern extensions can refresh the look of your home, making it more appealing both inside and out. They can blend seamlessly with the existing structure or stand out as a unique feature.

• Adaptability

Tailor your home to meet changing needs. For example, a growing family might need extra bedrooms, or you might need a dedicated workspace if you start working from home.

However, home extensions require proper planning and professional consultation. 

Consulting with architects and builders ensures that your project is executed successfully and meets all regulatory requirements. 

This approach helps you avoid trouble with regulatory agencies. Given the regulatory guidelines and their constant reviews and updates, it’s always best to let professionals guide you through the process—from obtaining necessary permissions to design and execution.

Thankfully, YOOP Architects can assist you. All you have to do is book a free professional consultation. In this article, we will take you through everything you need to know about home extensions in the UK. 

We will explore the types and share expert tips to help you choose the best extension type for your home.

The Importance of Home Extensions in the UK

Home extensions play a crucial role in the UK housing market. First and foremost, they allow homeowners to expand their living space without the hassle of moving. 

With property prices on the rise, many people find it more cost-effective to extend their current homes rather than purchase a larger property.

Moreover, home extensions can significantly increase the value of a property. This means that investing in an extension now can lead to higher returns when it comes time to sell. 

Many potential buyers are drawn to properties with additional space, as it offers more versatility.

• Avoiding Moving Costs: Extensions can be more economical than the expenses associated with buying and moving to a new home.

• Customised Living Space: Tailor your home to your specific needs, whether it’s a home office, gym, or an extra bedroom.

• Better Use of Outdoor Space: Converting unused garden areas into functional living spaces can enhance your home’s utility and appeal.

• Sustainability: Modern extensions can incorporate energy-efficient designs and materials, reducing your carbon footprint.

Proper planning and professional guidance are essential for successful home extensions. Regulatory guidelines in the UK are strict, and staying compliant is crucial. 

Therefore, consulting architects and builders ensures that the extension not only meets your needs but also adheres to all regulations.

Understanding Different Types of Extensions

In the UK, various types of home extensions cater to different needs and architectural styles, each with its own set of benefits and considerations.

1. Single-Storey Extensions

Single-storey extensions are a popular choice for expanding living space on the ground floor. They can accommodate larger kitchens, dining areas, or additional bedrooms, providing flexibility for growing families. 

These extensions enhance the functionality of your home by seamlessly integrating new spaces with existing ones. 

When planning a single-storey extension, consider maximizing natural light and maintaining a cohesive design that complements your home’s aesthetics.

Planning Permission: Single-storey extensions typically fall under permitted development rights, allowing certain types and sizes without needing full planning permission. 

However, restrictions apply, especially in conservation areas or for listed buildings. It’s advisable to check with local planning authorities or consult professionals to ensure compliance.

2. Double-Storey Extensions

Double-storey extensions offer substantial additional living space by adding another floor to your home. They are ideal for households needing multiple bedrooms or extra living areas. 

These extensions can significantly increase property value and provide long-term benefits for growing families. 

Consider the structural implications and ensure the design integrates well with the existing architecture to create a harmonious living space.

Planning Permission: Double-storey extensions often require full planning permission due to their scale and impact on the property’s appearance and neighboring properties. 

Factors such as height, proximity to boundaries, and local planning guidelines influence permission requirements.

3. Rear Extensions

Rear extensions extend from the back of the property, often creating spacious open-plan living areas or expanding existing rooms like kitchens. 

They are perfect for enhancing living spaces while maintaining privacy from the street. 

Consider incorporating large windows or bi-fold doors to maximize natural light and connect indoor and outdoor areas seamlessly.

Planning Permission

Rear extensions usually fall under permitted development if they meet specific criteria on height, depth, and impact on neighbors. 

However, certain conditions, such as conservation areas or listed buildings, may require planning permission.

4. Side Return Extensions

Side return extensions utilize underutilized space at the side of a property, typically transforming narrow corridors into functional spaces like kitchens or dining areas. 

They are popular in urban areas where land is limited, providing practical solutions to expand living space without compromising garden areas. 

When planning a side return extension, consider how it enhances your daily living and integrates with the existing layout for a cohesive home design.

Planning Permission: Side return extensions often fall under permitted development rights if within specific dimensions and do not exceed certain height limits. 

However, restrictions may apply in conservation areas or for listed buildings. 

5. Wrap-Around Extensions

Wrap-around extensions combine rear and side extensions, encircling the property to create a larger footprint. They offer extensive additional living space and can transform the entire layout of your home. 

These extensions are beneficial for creating versatile living areas and enhancing property value. 

Consider the impact on natural light and garden space when designing a wrap-around extension to ensure it complements your lifestyle and architectural style.

Planning Permission

Wrap-around extensions often require planning permission due to their scale and impact on the property’s appearance and neighboring properties. 

Factors such as height, proximity to boundaries, and local planning guidelines influence permission requirements.

6. Loft Conversions

Loft conversions convert underutilized attic space into functional rooms such as bedrooms, home offices, or playrooms. They are a cost-effective way to maximize space without altering the footprint of your home. 

Loft conversions often benefit from natural light and can enhance the overall aesthetic appeal of your property. 

Consider the structural feasibility and potential for adding value to your home when planning a loft conversion.

Planning Permission: Loft conversions usually fall under permitted development rights if specific conditions on size, height, and extension from the original roof are met. 

However, certain restrictions apply, especially in conservation areas or for listed buildings. 

7. Conservatories and Orangeries

Conservatories and orangeries are glazed extensions designed to bring natural light into the home, serving as additional living spaces or greenhouses. 

They provide a tranquil environment to enjoy garden views throughout the year. 

Consider the orientation and energy efficiency of the conservatory or orangery to ensure comfortable living conditions in all seasons. 

These extensions are perfect for enhancing your home’s connection with outdoor spaces while adding a unique architectural feature.

Planning Permission: Conservatories and orangeries often fall under permitted development rights if they meet specific size and design criteria. 

However, factors such as proximity to boundaries, impact on neighbors, and thermal efficiency may influence planning requirements.

Factors to Consider When Choosing an Extension Type

Choosing the right extension type for your UK home involves careful consideration of several key factors to ensure it meets your needs and complies with local regulations.

• Purpose and Functionality

Identifying the primary purpose of the extension, whether it’s for additional living space, a home office, or expanding the kitchen, is crucial. 

Matching the extension type to its intended use ensures it enhances your daily living and adds value to your home.

• Budget and Cost Implications

Each extension type comes with its own cost considerations. Assessing your budget and understanding the long-term value and return on investment helps in making a financially sound decision that aligns with your financial goals.

• Property Size and Layout

Evaluate the available space on your property and how each extension type would impact it. Consider the effect on your garden or outdoor areas and choose an extension that optimizes space without compromising outdoor living.

• Architectural Style and Aesthetics

Ensure the extension complements the existing architecture of your home. Blending the new extension seamlessly with the current design enhances visual appeal and maintains the overall aesthetic coherence of your property.

• Planning Permission and Building Regulations

Understanding local planning laws and regulations in the UK is essential. Take steps to obtain necessary permissions before starting construction to avoid legal issues and ensure compliance with building standards.

• Impact on Neighbours and Surroundings

Consider how the extension might affect neighbouring properties. Managing potential disputes or objections proactively can help maintain good relationships within the community and ensure a smoother construction process.

Considering these factors comprehensively allows you to make an informed decision when selecting the right extension type for your UK home.

Conversion Build Costs

Loft Conversion

(Best roof type for the loft extension is a gabled roof (2 sides slope) rather than a hipped roof (all 4 sides slope))

Types of Loft Conversions

• Room Loft Conversion
  Budget from £15,000
• Dormer Loft Extension
  Budget from £20,000 or from £35,000 with the inclusion of an en suite
• ‘Raising the Roof’ or Changing the Roof Structure
  Budget from £40,000
• Hip to Gable Roof Extension
  Budget from £25,000

Converting a Garage/Basement

Turning an existing basement/garage into a usable living space costs from £700 per square meter for the build costs

Extension Build Costs

The main governing factor of the cost of an extension is square footage or square meterage – how big it is. So, the bigger it is, the more it’s going to cost. 

Typically if you worked out a square meter at £1500, that’s a good base price for basic quality; £1900 per square meter for good quality and £2200 per square meter for excellent quality.

Rear/Side Extension Type (Single Storey)

For an average single storey extension of 20 square metres, the build cost would be from £30,000 for basic quality, from £38,000 for good quality and from £44,000 for excellent quality.

Double Rear Extension (Two Storey)

Budget from £53,000

Second-Floor Addition

If the ground floor’s existing foundations can take the load, then you may have the option to build a second-floor addition on top of an existing room. 

This is much more cost-effective than building a new extension type but will need planning permission if the addition is at the front of the property (i.e. above a garage)

Budget from £15,000

Additional Storey

Build costs start from £2,000 per square meter so for an average additional storey extension of 100 square meters, the build cost would be from £200,000. 

Another £7,500 to £12,000 worth of work needs to be added for lower-ground floor works like stair access and plumbing.

Additional costs that you may need to consider include:

• Permission fees

You’ll need to submit a ‘Prior Approval Application’ if you’re planning to build a larger single-storey rear extension type or an additional storey. 

If your renovation work or extension comes under permitted development and you don’t require prior approval, then you don’t need to make an application for planning permission – you can just start building. 

However, we recommend that you apply for a lawful development certificate to prove that the work is covered by permitted development.

• Professional fees (If you need an architect/structural engineer/project management)

• Reports about your property (Tree/Flood Risk/Ecology etc)

• Building Regulations Approval
  (You don’t need to get approval yourself if you use someone registered with a competent person scheme.)

• Party Wall Agreement
  (Covers shared walls/structures and protects both yourself and your neighbours whilst work is being carried out)

• Build Over Agreement

(If you’ve got a shared drain running across the back of your garden and you’re going to build over it or within three meters proximity)

• Insurance

If you are carrying out conversion/extension works you should arrange specialist insurance to cover the new works and the existing structure as most home insurers won’t cover works if contracts exceed £50,000. 

For expert advise on this and any other insurance exposures, please contact Gary Philip at GPS Insurance Brokers on 020 8207 7385. GPS Insurance 

Practical Tips for a Successful Home Extension

Successfully extending your home in the UK requires careful planning and execution. 

Here are key tips to ensure your project goes smoothly:

• Hiring a Professional Architect and Builder

Engage experts who can provide design creativity, technical expertise, and project management skills. They ensure your extension meets regulatory requirements and maximizes space effectively.

• Setting a Realistic Timeline

Plan your project timeline meticulously from design to completion. Anticipate potential delays and manage expectations to keep your project on track.

• Staying Within Budget

Effective budgeting is crucial. Allocate funds for design, materials, labor, and contingencies to avoid financial surprises during the project.

• Ensuring Quality and Compliance

Use high-quality materials and ensure compliance with building standards and regulations. This ensures a durable and legally compliant extension that enhances your home’s value.

PS: Always check with your local planning authority if you’re not sure whether or not you have any planning restrictions in place.

(For full details, please see https://www.legislation.gov.uk/uksi/2015/596/contents or contact Yoop Architects for further clarification/advice)

Conclusion 

If after taking into consideration what you need from your home and how much you want to spend, you’re still not sure what extension type would be right for you, contact an architect. 

There are two main groups of architects – those who do the Design & Planning of buildings and those who do the Delivery of buildings (some architects do both).

A ‘Design & Planning’ architect will be able to look at what you need from your home, the existing structure in place, your budget, local building rules and regulations etc and put together a variety of options that achieve your desired result.

At Yoop Architects, we achieve this by taking a measured survey of your property, which captures all the information. 

Then we draw it all up in 3D and create sketches to show sometimes five or six options so the process is very visual and easy to see and imagine what the finished result would be like. 

If you have any questions about renovating, planning an extension or just about creating your dream home in general, go ahead and book a free call with Yoop.