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Cost Estimator

How Much Does a Loft Conversion Cost?

Estimate loft conversion costs based on conversion type and location.

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Factors that affect cost

  • Conversion type โ€” mansard and hip-to-gable involve more structural work
  • Whether planning permission is required (permitted development limits apply)
  • Staircase design and position โ€” a new staircase adds ยฃ3,000โ€“ยฃ8,000
  • Standard of finish and whether an en-suite is included

๐Ÿ’ก Money-saving tips

  • 1.A dormer loft conversion offers the best balance of cost and extra space
  • 2.Check with your local council โ€” many conversions are permitted development
  • 3.Always use a structural engineer; their fee (ยฃ500โ€“ยฃ1,500) can prevent costly errors
  • 4.A loft conversion typically adds 20% to property value โ€” one of the best ROI home improvements

Frequently asked questions