Quick Answer
A loft conversion is one of the most cost-effective ways to add a bedroom and bathroom to your home. It typically adds 10-20% to your property value and avoids losing garden space.Types of Loft ConversionVelux/rooflight conversion is the simplest and cheapest (£20,000-30,000). N...
Key Information
- Last Updated:
- 5 May 2026
- Category:
- Extensions
- Reading Time:
- 1 min read
A loft conversion is one of the most cost-effective ways to add a bedroom and bathroom to your home. It typically adds 10-20% to your property value and avoids losing garden space.
Types of Loft Conversion
Velux/rooflight conversion is the simplest and cheapest (£20,000-30,000). No structural changes to the roof. Dormer conversion extends the roof vertically (£30,000-50,000). The most popular type. Hip-to-gable extends a hipped roof to a gable wall (£35,000-55,000). Mansard conversion replaces the entire roof slope (£45,000-70,000).
Building Regulations
All loft conversions need building regulations approval. Key requirements: fire-safe staircase with 30-minute fire doors, adequate structural support, and minimum headroom of 2.2m.
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I'm thinking of a dormer conversion, but I noticed the prices vary quite a bit. Could someone clarify why there's such a range within this type? Cheers!
When planning your Velux conversion, consider using triple-glazed rooflights for better insulation and noise reduction. It's a small detail that can make a big difference.
Just had a Velux conversion done in Bristol for £28k. Added 15% to our house value. Top tip – don't forget about those fire doors!
Just wondering, would a Velux conversion still add value to my home if I only needed another bedroom and didn't bother with a bathroom? Cheers!
Good guide. For mansard conversions, consider using timber trusses for additional strength & improved aesthetics. Always ensure your design adheres to Part L of the Building Regulations.