Should I Do a Single or Double-Storey Extension?

March 4, 2025

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by Archability

When planning a home extension, one of the biggest decisions you’ll face is whether to build a single or double-storey addition. Each option comes with its own benefits, costs, and design considerations. Let’s explore the factors to help you decide which is right for your home.

Budget and Cost Considerations

Single-storey extensions are generally more affordable, as they involve simpler structural work and fewer materials. However, if you’re already investing in foundations and structural elements, adding a second storey might be more cost-effective in the long run. While double-storey extensions are pricier, they can significantly increase your home’s value and usable space, making them a worthwhile investment for many homeowners.

Space and Functionality

If you’re looking to expand your living space — like adding a larger kitchen, dining area, or lounge — a single-storey extension may be sufficient. On the other hand, if you need extra bedrooms, a home office, or a second bathroom, a double-storey extension offers much more flexibility. Think about your family’s current and future needs when deciding how much space to add.

Planning Permission and Design Impact

Single-storey extensions often fall under permitted development rights, making the planning process quicker and easier. Double-storey extensions are more likely to require formal planning permission, especially if they affect neighboring properties’ light or privacy. Working with an architect familiar with local planning rules can help streamline the approval process and ensure your design meets all requirements.

Outdoor Space and Aesthetic Balance

Consider how your extension will impact your garden or outdoor area. Single-storey extensions take up more ground space, which might be a concern if you have a small garden. Double-storey extensions, on the other hand, preserve more outdoor space but can affect your home’s exterior proportions. A skilled architect can help design a structure that blends seamlessly with your existing home, regardless of the size.

The Final Decision

Ultimately, the choice between a single or double-storey extension comes down to your budget, space needs, and long-term goals. A single-storey might be perfect for a kitchen expansion, while a double-storey could future-proof your home for a growing family. By carefully weighing the pros and cons and consulting with an experienced design and build team, you can make the best choice for your home and lifestyle.

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