Factors that determine the cost of a Side Return Extension

Side return extensions are a great way to transform underutilised spaces into functional, stylish living areas. For properties such as Victorian homes, where narrow alleyways often run alongside the house, a side return extension provides an opportunity to create larger kitchens, open-plan dining areas, or even multi-functional spaces that seamlessly connect the indoors with the outdoors. However, there are several factors that need to be taken into consideration when determining the cost of such a project that ranges from the size of the extension and material choices to site conditions, professional fees and more, which we will explore further in this guide as below.

1. Size and Scale of the Extension

The size of your side return extension is the primary driver of cost. Naturally, the larger the extension, the more materials, time and labour it will require. However, the scale also depends on how you intend to use the space. For instance consider the following;

Small extensions – A modest side return extension that creates additional space for a kitchen or a family dining area will typically cost less but may vary based on other factors such as your choice of materials and finishes.

Larger extensions – Larger projects such as those that combine the side return with the rear of the house to create expansive, open-plan areas, will require additional construction work and also involve changes to the layout such as the removal of walls which also contribute toward the cost.

Height of the extension – Cost may also vary based on whether you opt for a single or a double-story extension where factors such as structural work and planning permissions need to be taken into account.

2. The Choice of Materials

The materials you choose for your side return extension will have an impact on both the cost and the overall aesthetic. From budget-friendly options to premium finishes, there’s a wide range to suit different preferences and budgets that include;

Standard materials – Materials such as bricks are more cost-effective and work well for seamless integration with existing structures.
Premium finishes – Premium material such as natural stone or slate roofing provides a luxurious finish.
Roofing options – Flat roofs are more budget-friendly, while pitched roofs or glass panels with roof lights add character but can impact the cost.

3. Design Complexity and Features

The design and features you incorporate into your extension also play a role in determining the cost. Below are a few such elements that can determine the cost of your side return extension;

Structural changes – Removing walls to integrate your side return extension with a larger project which change layout and structural changes contributes to the overall cost yet opens up incredible design opportunities.
Glazing options – Skylights, roof lanterns, or large bi-fold doors are excellent for maximising natural light, making the space feel brighter and more spacious.
Connecting indoor and outdoor spaces – Features like sliding doors create a seamless flow between your home and garden, enhancing usability and appeal.
Bespoke finishes – Customised shelving and premium interior finishes add style and functionality but require specialist work.
Heating and lighting – Adding underfloor heating, lighting, or smart home systems enhances comfort and functionality.

4. Planning Permissions and Building Regulations

The cost of your side return extension may be influenced by planning and regulatory requirements. Fortunately, many side return extensions fall under permitted development, meaning you may not need formal planning permission as long as the extension meets specific criteria, such as size and height restrictions. However, there are exceptions where if your property is listed, located in a conservation area, or you plan to exceed permitted development limits, you will need to apply for planning permission, which may carry associated costs.

5. Site Conditions and Structural Work

The existing condition of your home and site can also influence the overall cost of the extension. For example, older properties such as that of Victorian homes may require additional structural reinforcements to accommodate the new extension, particularly if walls need to be removed to create an open-plan layout.

Similarly, ground conditions can add complexity such as drainage issues, or existing utilities that need relocating which will require additional work and materials. While these factors may seem overwhelming, they are often manageable with careful planning and an experienced project management team.

Reimagining Your Living Space with a Side Return Extension from Good Design & Build

At Good Design & Build, we specialise in helping homeowners transform their spaces with bespoke side return extensions. Our team of experts is committed to blending contemporary designs with your home’s existing structure, ensuring that the final result is both stunning and practical. If you’re ready to create a space that works beautifully for your lifestyle, contact us today to discuss your project.

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