Barn conversion Cost Calculator
A UK barn conversion costs £1,500–£3,000 per m² in 2026 for the conversion works, rising to £2,200–£4,000/m² for a high-specification, glass-heavy finish. In whole-project terms that's roughly £150,000–£300,000 for a small 100m² barn, £300,000–£600,000 for a typical 200m² barn, and…
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2 steps, using the figures from our cost guide.
How this calculator works
Every figure in this calculator is the one published in the cost table on our barn conversion guide. Pick the option that matches your job and the calculator returns that published range, adjusted for your region - it does not model anything the guide does not already say.
That is deliberate. A calculator whose rates drift from the page it sits under is worse than no calculator, because two numbers on the same site disagree.
What it cannot know: access, the condition of what is already there, and anything structural. Those are what separate three real quotes from each other.
Published barn conversion costs (2026)
| Option | Typical 2026 cost | Notes |
|---|---|---|
| Small (100m²), standard finish | £150,000–£200,000 | |
| Medium (200m²), standard finish | £300,000–£400,000 | |
| Large (300m²), standard finish | £450,000–£600,000 | |
| Small (100m²), mid-range finish | £200,000–£280,000 | |
| Medium (200m²), mid-range finish | £400,000–£560,000 | |
| Large (300m²), mid-range finish | £600,000–£840,000 | |
| Small (100m²), high-end finish | £280,000–£400,000 | |
| Medium (200m²), high-end finish | £560,000–£800,000 |
These are the figures from our barn conversion cost guide.
Barn conversion calculator — FAQs
It uses the same published figures as the cost guide it sits under, adjusted for your region. It is a budgeting estimate, not a quote - only a site visit produces one of those.
Related cost guides
- Barn conversion cost guide — The full price guide
- All builders services — Browse the hub
- All BestBuilders services — Every trade we cover
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