Loft Conversion Cost in London: What to Expect in 2025

One of the first questions homeowners ask when considering a loft conversion is: how much will it cost? The answer depends on your property type, the scope of work, and where in London you're based.

Typical Cost Ranges

Basic loft conversions (Velux/rooflight style) typically start from around £25,000–£35,000. Dormer conversions, which add more headroom and floor space, often range from £35,000–£55,000. Larger projects with rear dormers or hip-to-gable conversions can exceed £60,000.

What Affects the Price?

• Property type (terraced, semi-detached, detached)
• Roof structure and access
• Whether you need planning permission or building regulations
• Finishes: basic vs premium
• Location within London (labour and material costs vary)

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