Cost to build a dormer loft conversion in SY23

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Add extra space to your SY23 home from £41,608

Dormer loft conversions are ideal if you want to add lots of extra space to your home. Adding a box-like structure or structures to the roof, you essentially extend the roofline to add significant square footage to your loft space. This makes dormer loft conversions one of the most popular loft conversion types, as they're ideal for adding a new main bedroom with en-suite or even a self-contained living space.

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Build a dormer loft conversion cost in SY23

Cost of dormer loft conversions in SY23

Estimates for build a dormer loft conversion near SY23

In SY23, prices for dormer loft conversions range from £41,608 (SP Coupland Ltd based in SY25) to £41,616 (DRAGON CONSTRUCTION T/A based in SY25), but how much your conversion costs will vary depending on the size of your property, how easy access to your roof is and what you want to use the space for.

The best way to get an accurate price is to compare quotes from extension builders in SY23. Post your job on HaMuch now and we'll put you in touch with available extension builders.

Estimates for common extension builder jobs in SY23;

Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building

Underpin a building - £17,112

Two storey extension

Two storey extension - £87,418

Build a timber frame extension

Build a timber frame extension - £25,612

Build a swimming pool

Build a swimming pool - £80,612

Single storey extension

Single storey extension - £47,240

Side return extension

Side return extension - £37,135

Install an RSJ

Install an RSJ - £1,812

Outbuilding

Outbuilding - £9,612

Build a Mansard loft conversion

Build a Mansard loft conversion - £51,612

Loft conversion

Loft conversion - £30,113

Build a kitchen extension

Build a kitchen extension - £41,612

Hip to gable loft conversion

Hip to gable loft conversion - £41,612

Granny annexe

Granny annexe - £86,612

Garden office

Garden office - £9,612

Convert a Garage

Convert a Garage - £15,612

Garage

Garage - £18,112

Build a flat roof extension

Build a flat roof extension - £21,612

Build a dormer loft conversion

Build a dormer loft conversion - £41,612

Concrete foundations

Concrete foundations - £5,862

Convert a bungalow loft

Convert a bungalow loft - £28,612

Convert a basement

Convert a basement - £33,135

More extensions & conversions cost guides...