Garage conversion vs loft conversion: which is cheaper?
A garage conversion is the cheaper way to add a room: typically about £14,000, against roughly £45,000 for a loft conversion. The garage route uses space you already have at ground level, while a loft adds a bedroom upstairs, often with room for an en-suite, and keeps your ground floor. If budget is the priority the garage wins; for an extra bedroom that adds the most value, a loft usually does more.
Garage conversion vs Loft conversion: the cost
| Option | Range | Typical | Priced |
|---|---|---|---|
| Garage conversion | £7,500 to £20,000 | £14,000 | for the conversion |
| Loft conversion | £22,000 to £75,000 | £45,000 | for the project |
Costwise guide prices, reviewed June 2026, not quotes. Note the two are quoted on different bases, so the figures above are not a like-for-like comparison on their own.
Garage conversion vs Loft conversion: the difference
| Factor | How they compare |
|---|---|
| Typical cost | Garage conversion about £14,000; loft conversion about £45,000 for the project. |
| What you gain | Garage: a ground-floor room such as an office or snug. Loft: a bedroom upstairs, often with space for an en-suite. |
| Trade-offs | A garage conversion loses your garage and any off-street parking. A loft keeps the garage but costs more and needs head height. |
| Best for | Garage: the lowest-cost way to add a room. Loft: an extra bedroom and usually more added value. |
Common questions
Yes, usually by a wide margin. A single garage conversion is typically around £14,000, while a loft conversion averages about £45,000, because the loft needs structural work, a staircase and often a dormer.
A loft conversion that adds a double bedroom usually adds more value than a garage conversion, though losing a garage and parking can put some buyers off. It depends on your property and area.
These are independent guide prices based on typical UK jobs in 2026. Your actual cost depends on your property, spec, access and where you live. Always get at least three written quotes before committing.