Single vs Double Storey Extensions: Which One’s Right for Your Home?

 Choosing between single and double storey extensions can shape your home’s future. Whether you're seeking more space, adding value, or updating layout, the right decision matters. Each option offers unique advantages. Your budget, lifestyle, and property type will help decide the best fit. Let’s break down the pros, cons, and considerations for both styles.



What Is a Single Storey Extension?

A single storey extension involves building outwards at ground level. These are usually added to the rear or side of a house. They can create extra space for a kitchen, dining area, playroom, or even a home office.

One major benefit is cost. Single storey builds typically require less structural work. As a result, they are quicker and more affordable than double storey extensions. Also, they are often less disruptive during construction.

However, a single level extension uses up more garden space. If outdoor space is limited, this might not suit your needs. You’ll also only gain one floor of extra room, which could feel limiting long-term.

What Is a Double Storey Extension?

A double storey extension adds two floors above the original footprint. Usually built on the back or side of a property, it provides room on both the ground and first floor. This is ideal for growing families or homeowners needing multiple spaces.

This type of extension offers more value per square metre. You double the usable space without doubling the cost. That makes it a more efficient investment if you plan to stay in your home long-term.

The main drawback is cost and complexity. Double storey builds require more planning and stronger foundations. They also tend to take longer to complete. Additionally, planning permission is more likely to be needed due to the increased impact on neighbours.

Planning Permission Considerations

Whether you choose single or double storey extensions, planning permission may apply. For single storey builds, permitted development rights often cover rear extensions up to 4 metres (detached homes) or 3 metres (others).

Double storey builds, however, almost always need approval. You must consider privacy, sunlight, and neighbour objections. Always check with your local planning authority before you begin.

Also, listed buildings or properties in conservation areas have stricter rules. Consult an architect or planner for tailored advice before moving forward.

Comparing Costs: What’s More Budget-Friendly?

In terms of upfront cost, single storey extensions win. They’re simpler and require fewer materials. Average costs range from £1,500 to £2,500 per square metre.

Double storey builds cost more overall but are more cost-effective per square metre. Expect prices from £2,000 to £3,000 per square metre, depending on design and materials. If you're planning to add both a bedroom and an office, the long-term value can outweigh the upfront cost.

If your budget is tight and you only need one new space, a single storey might be the better option. But if you're thinking long term, a double storey can offer greater flexibility and value.

Design Flexibility and Use of Space

With single storey extensions, open-plan living is easy to achieve. You can merge a new kitchen with dining and lounge areas, making one large, social zone. Roof lights and sliding doors help bring in light and garden views.

Double storey extensions offer more room but need careful planning. You must think about how both floors connect with the rest of the house. It’s the best option if you want an extra bedroom, bathroom, or study space upstairs while extending downstairs too.

Your choice should reflect how your family uses the space. If sleeping and working space is needed upstairs, a two-level build is best. But if your kitchen feels cramped or you want to open up living areas, a single level may work.

Impact on Property Value

Extensions often boost property value—when done well. Double storey extensions typically offer a greater increase in value, as they add both living and sleeping space. Buyers find this highly attractive, especially in urban areas.

That said, single storey additions can also appeal to buyers. Open-plan kitchens, garden rooms, or home offices are in high demand. The key lies in quality design and seamless integration with the original structure.

Keep in mind that overextending can hurt value if it removes too much outdoor space. Always aim for balance.

Which One Should You Choose?

There’s no one-size-fits-all answer. A single storey extension is ideal for those who:

  • Need quick results

  • Have a smaller budget

  • Want to extend living space

  • Prefer keeping bedrooms as-is

A double storey is better if you:

  • Need more space both up and down

  • Want better value for investment

  • Plan to stay long term

  • Have no issue with a longer build time

Discuss your needs with a professional to create a plan that fits your lifestyle and property type.

Conclusion

Choosing between single and double storey extensions comes down to your goals, space, and budget. Both types can enhance your home's function and increase its value. A single storey is faster, cheaper, and ideal for living space improvements. Meanwhile, a double storey offers twice the space and long-term value, but requires more investment and planning.

Location: London, UK

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