loft conversion
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How Much Does a Loft Conversion Cost? 

Typical costs for a loft conversion start at £25k but this figure can be far higher for larger or more complicated conversions.  

These costs are for a fully managed service from start to finish, from an idea about your empty roof space to a beautifully finished room, including: 

  • Interior Design 
  • Structural Design 
  • Planning Permission Submissions 
  • Building Regulations Approval 
  • Building Materials 
  • Labour 

These costs assume that we are taking empty roof space and turning it into a finished, habitable room with: 

  • Heating 
  • Lighting 
  • Electric sockets 
  • Insulation 
  • Decorated walls and floors 
  • At least one window 
  • A staircase down to the next level of your property 

The cost of a loft conversion will depend on many factors, including the size and shape of the existing property, but mostly on what type of conversion is chosen. 

Type and Costs of Loft Conversion 

Loft conversions can be grouped into 4 different types, each with their own approximate cost bands: 

  • Roof Light Conversion (£25k - £35k) 
  • Dormer Conversion (£27k - £50k) 
  • Hip-to-Gable Conversion (£42k - £50k) 
  • Mansard Conversion (£40k upwards) 

Roof Light Conversion (£25k - £35k) 

A roof light conversion is the cheapest and most straightforward type of loft conversion because it doesn't require any changes to the shape of the roof. With this type of conversion, skylights are added to the roof as well as a floor and a staircase. 

Conversions of this type can only work if you have a large roof space to begin with. Many houses don't have enough space and extend the roof space using dormers. 

Dormer Conversion (£27k - £50k) 

A dormer loft conversion is an extension which protrudes from the slope of the roof. 

These are the most popular types of loft conversion as they are suitable for just about any house with a sloping roof. 

Dormer conversions add a lot of floor space and headroom to a loft, but they do require structural modifications to the roof, hence why they are more expensive than roof light conversions. 

Hip-to-Gable Conversion (£42k - £50k) 

A Hip-to-Gable conversion is where the sloping 'hip' of a roof is removed and replaced with a pitched roof or pitched-plus-dormer configuration. 

This type of loft conversion can only be used on detached or semi-detached properties because terraced houses do not have a sloping side roof which can be extended. 

Hip-to-gable loft conversions create a lof of usable floor space but require significant remodelling of the roof structure, hence why they are more expensive than dormers. 

Mansard Conversion (£40k upwards) 

A mansard loft conversion is where the shape of the entire roof is changed to create more living space. The roof is made to slope at two different angles; a very shallow (or even flat) section in the middle and a very steep section around the edges. 

This type of loft conversion effectively creates an entirely new floor of living space on your property but doing so requires the roof to be all but completely replaced, hence why it is the most expensive option. 

If you are thinking about having a loft conversion but don't know what type would suit your property best, get in touch with us, we'd be happy to help.

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