A modelled 2026 planning range for a loft conversion renovation in Cardiff is £20,000 to £60,000, with a mid-range reference point near £40,000. This is a currency-adjusted planning baseline, not a local contractor quote. Room size, scope, labour, permits and finish choices can move real bids materially.
Loft Conversion renovation cost (Cardiff, 2026)
| Budget level | Typical cost | What you get |
|---|---|---|
| Budget | £20,000 | Refresh: decorating, light updates, keep existing layout and fittings. |
| Mid-range | £40,000 | Most popular: new fittings and finishes, quality materials, professional labour. |
| Luxury | £60,000 | High end: premium or bespoke materials, layout changes, specialist trades. |
What affects the cost
- Room size — larger loft conversions need more materials and labour.
- Quality of finishes — budget, mid-range and premium materials vary widely in price.
- Labour and location — tradespeople in Cardiff charge different day rates.
- Structural changes — moving walls, plumbing or electrics adds significantly to the cost.
- How much you keep — retaining the existing layout and sound fittings saves the most.
Frequently asked questions
How much does a loft conversion renovation cost in Cardiff?
In 2026 a loft conversion renovation in Cardiff usually costs between £20,000 and £60,000, with a typical mid-range project around £40,000.
What is the cheapest way to renovate a loft conversion?
Keeping the existing layout, refreshing rather than replacing fittings, and doing decorating yourself keeps a loft conversion renovation near the budget end of around £20,000.
What pushes a loft conversion renovation towards the luxury end?
Premium materials, bespoke joinery, moving services or walls, and high-end labour push costs towards the luxury range of about £60,000 or more.
Can I preview my loft conversion redesign before paying for the work?
Yes. Remodelling Centre lets you upload a photo of your loft conversion and preview a full redesign with AI in about 30 seconds, so you can plan the look and budget before committing.