Thinking about adding an extension, but want more space than a single floor can offer? A double-storey extension could be the solution you are looking for. This architectural design provides you with the extra space you need while adding significant value to your property.

In this article, we'll explore everything you need to know about double-storey extensions, including the benefits, planning considerations and cost implications of embarking on a project of this scale.

Benefits of a Double-Storey Extension

Let’s start by looking at the benefits of adding a double-storey extension to your home:

• Maximise space. A double-storey extension is an excellent way to maximise the available space in your property. Unlike single-storey extensions, which only expand horizontally, a double-storey structure increases both the ground and first-floor areas. This approach is particularly beneficial for growing families needing additional bedrooms, bathrooms or even a home office.
• Enhance property value. Investing in a double-storey extension can substantially increase your home's market value. Properties with additional living space are highly attractive to potential buyers, ensuring a good return on investment. As a result, a well-designed extension can make your home stand out in the competitive UK property market.
• Improve aesthetic appeal. Finally, a double-storey extension can dramatically improve your home's kerb appeal. Modern architectural designs can blend with your existing structure, creating a cohesive and visually appealing façade. The added space also offers an opportunity to modernise interiors, incorporating contemporary design elements that enhance the overall aesthetic of your home.
  
  

Planning Your Double-Storey Extension

Before embarking on a double-storey extension, it's important to first assess your needs and goals. Consider how the additional space will be used and what specific features you require. Working with an experienced architect can help you visualise the potential of your extension and guarantee that it meets your expectations.

You will also more than likely need to apply for planning permission before starting construction. The only exception where UK planning permission is not required for a double-storey extension is if it falls under Permitted Development Rights. However, these rights come with stringent criteria and limitations:

• Location. Two-storey and first-floor extensions are only permitted at the rear of the property.
• Height. The height of the double-storey extension must not exceed the height of the existing house eaves.
• Area. The double-storey extension must cover less than 50% of the total free area around the house.
• Width. The width of the double-storey extension must be less than 50% of that of the existing house
• Length. The maximum length of a rear double-storey extension is 3m for terraced or semi-detached houses and 4m for detached houses
• Appearance. The exterior appearance must blend in with the existing house and surrounding properties.

If your double-storey extension does not meet all the above criteria, then you will need to apply for planning permission.

Finally, regardless of whether or not you need planning permission, your double-storey extension will need to meet all UK building regulations. These regulations cover aspects including structural integrity, fire safety, insulation and energy efficiency. Working with a professional builder who understands these regulations will ensure your double-storey extension meets all necessary standards.

How Much Does a Double-Storey Extension Cost?

How much does a double-storey extension cost on average? And what are your options in terms of financing?

Costs can vary widely depending on size, complexity and location. However, to give you an idea, on average, homeowners in the UK can expect to spend between £1,500 and £2,500 per square metre. Above all, make sure you set a realistic budget and include a contingency fund for unexpected expenses.

In terms of financing, you have a few options. These include savings, home improvement loans and remortgaging. It’s always best to consult with a financial advisor who can help you choose the best option for your circumstances and ensure you have the necessary funds to complete your project.

Finally, while a double-storey extension represents a significant investment, it's important to consider the long-term value it adds to your property. In addition to the immediate benefits of increased space and improved living conditions, the enhanced property value can provide substantial financial returns if you decide to sell your home in the future.

Design Considerations

A key consideration when designing your double-storey extension is making sure it blends in with your existing structure. This involves matching materials, rooflines and architectural styles. Good integration enhances the visual appeal of your double-storey extension and ensures the new space feels like a natural extension of your home.

Lighting is another important aspect to consider when you design your double-storey extension. For instance, incorporating ample windows and skylights can maximise natural light and create bright, airy interiors. Consider using modern glazing solutions to improve energy efficiency and reduce heat loss, making your home more sustainable.

In terms of layout, consider the flow between rooms and how the extension will connect with your existing layout. Open-plan designs are popular for their spacious feel, while strategically placed partitions can create cosy, private areas.

Potential Challenges

It’s also important to anticipate potential challenges and delays when you plan your double-storey extension as these can impact your timeline and budget. 

For instance, it can often take a long time to obtain planning permission for a double-storey extension, so make sure you submit your application as early as possible and stay in close communication with your local planning authority to address any issues as soon as they arise. Additionally, compliance with building regulations can introduce further delays, particularly if adjustments need to be made to your plans to meet safety and structural standards.

Aside from the above, unexpected costs can arise during any construction project. To avoid budget overruns, it's important to set a realistic budget and include a contingency fund for unforeseen expenses. In addition, regularly review your budget and keep track of all expenses to help you stay on track financially.

Lastly, consider the potential disruption to your daily life during construction. Plan your project timeline carefully and communicate any concerns to your builder to minimise this disruption. In some cases, you might need to temporarily relocate during the most intensive phases of construction.

The Importance of Hiring Skilled Professionals

Hiring skilled professionals for your double-storey extension is essential for a smooth and successful project. Experienced architects, builders and project managers bring valuable knowledge and expertise, which are crucial for handling the complexities of the design and construction process.

For instance, an experienced architect can help you design a space that meets your needs and complies with local planning rules and building regulations. They know how to make the most of your space, choose the right materials and ensure the structural soundness of your extension.

Professional builders, in turn, are vital for turning the architect's plans into reality. They have the skills to manage the construction work efficiently and make sure that everything is built to high standards and within the agreed timeframe. They also adhere to safety regulations, which is important for the well-being of both the construction team and the occupants of the house.

Lastly, a good project manager can oversee the entire process, coordinating between architects, builders and other tradespeople. They help keep the project on track, handle any issues that arise, and stay within budget.