How Much Does a Side Extension Cost for a Bungalow?
Extending a bungalow with a side extension can be a fantastic way to add valuable living space, improve functionality, and increase your home's overall value. But one of the first questions homeowners ask is: how much will it cost? Understanding the typical expenses involved can help you plan your project more effectively and avoid surprises along the way.
What Is a Side Extension?
A side extension is an addition built to the side of a property, often used to create extra rooms such as kitchens, living areas, or bedrooms. For bungalows, which are single-storey homes, side extensions are especially popular because they maintain the single-level living space while significantly increasing the footprint.
These extensions are ideal for properties with ample space on either side, allowing for a seamless blend between the original structure and the new addition.
One of the key advantages of a side extension is the flexibility it offers in terms of design. Homeowners can choose from a variety of architectural styles, ensuring that the new space complements the existing structure. Whether opting for a modern glass extension that floods the interior with natural light or a more traditional brick-and-mortar design, the possibilities are vast. Additionally, side extensions can often be tailored to meet specific needs, such as incorporating open-plan layouts that enhance the flow of the home, or adding features like bi-fold doors that connect indoor and outdoor living spaces.
Furthermore, a side extension can also increase the overall value of a property. In many cases, well-designed extensions can yield a significant return on investment, particularly in sought-after neighborhoods. Homebuyers are often attracted to properties that offer additional living space without the need for moving, making a side extension a strategic choice for homeowners looking to enhance their living environment and market appeal. As urban living continues to evolve, side extensions provide a practical solution for families seeking more room while staying within the confines of their existing property boundaries.
Typical Costs of Side Extensions for Bungalows
The cost of a side extension can vary widely depending on factors such as size, design complexity, materials, and location. However, recent data suggests that side extensions generally cost between £2,000 and £4,000 per square metre.
For example, a 25 square metre side extension could cost anywhere from £50,000 to £100,000. This range reflects the variability in project scope and finishes, so it's essential to get detailed quotes tailored to your specific plans.
Why Do Costs Vary So Much?
Several factors influence the final price of a side extension:
- Structural Complexity: Side-return extensions often require bespoke structural work, especially if they involve altering load-bearing walls or working within tight spaces. This can push costs towards the higher end of the scale, typically between £2,400 and £3,500 per square metre.
- Access and Site Conditions: Limited access to the side of the bungalow or challenging ground conditions can increase labour and equipment costs.
- Materials and Finishes: The choice of materials, from standard bricks to high-end cladding or bespoke windows, significantly impacts the budget.
- Location: Building costs vary across the UK, with London and the South East generally more expensive than other regions.
In addition to these factors, the design and architectural style of the extension can also play a crucial role in determining costs. For instance, a contemporary glass extension may require specialized contractors and materials that can elevate the overall expense. Furthermore, if the extension is designed to blend seamlessly with the existing structure, it may necessitate more intricate craftsmanship, which can further increase costs. Homeowners should also consider the potential for additional expenses related to planning permissions and building regulations, which can vary significantly based on local authority requirements.
Another important aspect to consider is the potential for unforeseen costs during construction. Issues such as discovering damp, outdated wiring, or plumbing problems can arise, leading to additional work and expenses. It’s wise to set aside a contingency budget, typically around 10-20% of the total project cost, to accommodate these unexpected challenges. Engaging with experienced builders and architects can help mitigate some of these risks, as they can provide insights into potential pitfalls and ensure that the project stays on track and within budget.
Additional Costs to Consider
Beyond the basic construction cost, there are other important expenses to factor into your budget:
Design and Planning Fees
Hiring an architect or architectural technician to design your side extension is highly recommended to ensure the project meets your needs and complies with regulations. Design fees typically range from 4% to 8% of the construction costs. If you choose to have the architect manage the entire project, fees can rise to around 15%.
Planning Permission and Building Control
Most side extensions require planning permission, which in England costs around £258 and slightly less in Wales at £190. Additionally, Building Control fees for extensions between 10m² and 40m² are approximately £600. These fees cover the inspections and approvals needed to ensure your extension is safe and compliant.
Why Choose a Side Extension for Your Bungalow?
Side extensions are particularly popular for bungalows because they allow homeowners to:
- Maintain Single-Storey Living: Unlike adding a second storey, side extensions keep everything on one level, which is ideal for accessibility and future-proofing.
- Maximise Garden Space: By extending sideways rather than rearward, you can preserve more of your garden.
- Enhance Property Value: Adding well-designed living space can significantly increase your home's market appeal and value.
Recent Trends in Extension Costs
According to recent industry reports, the cost of home extensions in the UK in 2025 varies depending on the type of extension:
- Single-storey extensions, like those typical for bungalows, generally range from £1,800 to £3,500 per square metre.
- Side-return extensions, which are a common form of side extension, tend to be more bespoke and cost between £2,400 and £3,500 per square metre due to the structural work involved.
These figures align well with the broader cost range for side extensions and highlight the importance of considering the specific nature of your project.
Tips for Managing Your Side Extension Budget
To keep your side extension project on track financially, consider these practical tips:
- Get Multiple Quotes: Always obtain detailed quotes from several builders to compare prices and services.
- Plan Thoroughly: Clear plans and specifications help avoid costly changes during construction.
- Consider Phased Work: If budget is tight, discuss with your builder whether the project can be split into stages.
- Factor in Contingencies: Set aside at least 10% of your budget for unexpected costs.
Final Thoughts
Adding a side extension to a bungalow is an excellent way to create more space and enhance your home’s functionality. While costs can vary, understanding the typical price per square metre and additional fees will help you plan effectively.
Remember that bespoke structural work and site conditions can influence the final cost, so consulting with professionals early on is key. With careful budgeting and planning, your side extension can become a valuable and enjoyable addition to your bungalow.