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Richard Domenech

Cost to build a loft conversion 2023?

Updated: Jul 11, 2023

We often get asked this question on the phone. We need to survey the building and produce architectural drawings before we can start calculating construction costs as many different factors affect the cost.



Cost to build a loft conversion 2023?
Cost to build a loft conversion 2023?


Home building costs for loft conversion.

A dormer loft conversion typically costs between approx. £27,000 - £50,000 depending on the specification of the build. The average dormer loft conversion costs around £35,000–£45,000 for a London home.


The cost of a loft conversion varies on many factors such as size, type of loft, location and internal fitout.


Cost to build a loft conversion 2023?


Typical cost of different types of loft conversions.

Loft Pod (L-section Only) - £26k Approximate Cost

Skylight or Velux Loft Conversion - £24k - £32k Approximate Cost

Dormer Loft Conversion - £28k - £50k Approximate Cost

Hip To Gable Loft Conversion - £42k - £52k Approximate Cost

Mansard Loft Conversion - £50k Approximate Cost


Time frame for a home loft conversion construction from design to build.

Typically a loft conversion build time can take between 4 and 12 weeks depending on the type and size. Weather can delay the project but your contractor can work around the weather by erecting a scaffolding canopy.

How much does it cost to build a loft conversion?
How much does it cost to build a loft conversion?

Will a loft conversion increase my property Value and by how much?

Nationwide found that adding a loft conversion that includes a bathroom and a double bedroom would typically add around 20% to the value of a standard three-bed, one-bathroom property.


This is a Approximate cost for the build of a loft conversion and prices vary from contractor to contractor, building size and internal specifications. You will also have to consider the cost of 2nd fix materials which are not included within the price.

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