If you need more space, the two most popular options are a loft conversion or a house extension. Both add value to your home, but they serve different purposes, come with different costs, and create different types of benefits. Here’s how to decide which is right for you.
Advantages of a Loft Conversion
- Creates extra bedrooms or a home office without taking garden space.
- Often doesn’t need planning permission (if within permitted development).
- Adds resale value as extra bedrooms are in high demand.
- Typically quicker to complete than an extension.
Advantages of a House Extension
- Expands living space where families spend most time (kitchen, dining, lounge).
- More flexibility in design and layout.
- Ideal if your loft isn’t suitable for conversion (low head height or trussed roof).
Cost Comparison (2025)
- Loft conversion: £25,000 – £60,000 (depending on type and size)
- Rear extension: £20,000 – £50,000 (single-storey)
- Double-storey extension: £40,000 – £80,000+
👉 On a like-for-like basis, extensions are often cheaper per square metre than loft conversions, especially single-storey kitchen or dining extensions.
Value Added
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Loft conversion: adds 15–20% to property value (increasing the bedroom count is highly attractive to buyers).
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House extension: adds 10–15%, but the return depends heavily on location and build quality.
Which is Best?
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Choose a loft conversion if you want an extra bedroom, ensuite, or home office.
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Choose a house extension if you need more downstairs living space, such as a larger kitchen or family room.
Final Thoughts
Neither option is automatically “better.” The right choice depends on your home and lifestyle. A loft conversion is best for extra bedrooms, while a house extension improves day-to-day living space. Many families eventually do both to get the best of both worlds.
Learn more about our Loft Conversion Services and explore our Loft Conversion Guides & Ideas for inspiration.