What is the cost of a Loft Conversion?

How much does a loft conversion actually cost?


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Loft conversion types & their cost

The costs below are guidelines only, costs can and will vary from project to project. For your free site survey, written quotation & sketch drawings please contact us today.

L Shape Mansard loft conversion

L Shape Mansard

From £45,000+VAT
L shape mansard loft conversions could provide your home with an extra 410 sq. feet of floor space. Plenty of space for a master bedroom, bathroom and additional bedroom/study!

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Hip to Gable loft conversion

Hip to Gable

From £40,000+VAT
Hip to gable loft conversions could provide your home with an extra 410 sq. feet of floor space. Plenty of space for a master bedroom, bathroom and additional bedroom/study.

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L Shape Dormer loft conversion

L Shape Dormer

From £42,000+VAT
L shape dormer loft conversions could provide your home with an extra 410 sq. feet of floor space. Plenty of room for a master bedroom, bathroom and additional bedroom/study.

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Single Dormer loft conversion

Single Dormer

From £35,000+VAT
Single dormer loft conversions could provide your home with an extra 260 sq. feet of floor space. Plenty of room for a master bedroom and bathroom.

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Double Mansard loft conversion

Double Mansard

From £65,000+VAT
Double mansard loft conversions could provide your home with an extra 350 sq. feet of floor space. Plenty of space for two bedrooms and a bathroom.

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Single Mansard loft conversion

Single Mansard

From £40,000+VAT
Single mansard loft conversion could provide your home with an extra 260 sq. feet of floor space. Plenty of room for a master bedroom and bathroom.

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Costing examples

The cost of a Dormer Loft Conversion

You have an 'average width' 4.8m (16 feet) London Victorian terrace house for example - a loft conversion here to include a full width rear dormer is likely to be in the region of 35k + VAT - to include:

  • ‘Drawings'… measured survey, architect consultation and detailed construction drawings
  • Building Regulations
  • Scaffolding - with appropriate temporary weathering as required
  • ‘Building works’...
    • 1st fix work – roof works to include; rear dormer, steel work, new floor, walls, velux window(s), casement windows in dormer, stairs etc.
    • 2nd fix work – insulation, plasterboard, skim coat finish, fire doors, skirting, electrics, radiator(s) etc.
  • 'Bathroom'… services, drainage, plumb in client supplied bathroom suite and tiling

Effectively everything… just a lick of paint and flooring (i.e. carpet) will be required to finish!

Variations to the above:

  • L shaped dormers are normally IRO 42k + VAT
  • Single mansards are normally IRO 40k + VAT
  • L shaped mansards are normally IRO 45k + VAT
  • Dormers - with 'hip to gable' roof extensions are normally IRO 40k + VAT

The cost of a Velux / Rooflight Conversion

The range of prices you might expect to pay for a velux loft conversion may be in the region of 25-30k + VAT – this includes:

  • Construction drawings
  • Scaffolding
  • Steel beams
  • New supporting and bracing rafters
  • Flooring
  • Stairs
  • Velux window
  • Fire doors
  • Insulation, plasterboard and skim coat finish
  • Skirting and architrave
  • Electrics and smoke detectors
  • Radiator

Basically everything but finished flooring (carpet, laminate etc) and decoration.

Some 'extra over' options:

  • Exterior roofing works
  • Bathroom / cloakroom suites
  • Painting and decorating
  • Moving water tanks and/or upgrading to combi or megaflow cylinder
  • Finished flooring - carpet, timber, laminate, vinyl etc
  • Built in cupboard and wardrobes

Please note - we are not interested in 'bodge jobs' or illegal conversions - all projects must be fully compliant with Building Regulations.


Loft conversion costs are guidelines

The costs illustrated above are guide prices. We are sure you can appreciate lofts come in all shapes, sizes and conditions, so costs can and will vary from project to project. For your free site survey, written fixed price quotation and sketch drawings please contact us.


Still not convinced? Compare our prices.

Take a look at the Whatprice online 'forum' to see what other people have been paying for their loft conversions & how we compare…

http://www.whatprice.co.uk (opens in new window)
http://www.whatprice.co.uk/prices/building/loft-conversion-whole-project.html (opens in new window)


Contact us today:

We are Londons best loft conversion company call us now on 0208 166 5145 to discuss your roof light / velux loft conversion project, or Contact us now ›


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  • Pay NO DEPOSIT just 3 x 25% stage payments - balance on job completion
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  • FREE Architect service
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  • We guarantee our builds for 10 years
  • We offer a free survey & advice when you want
  • We invite you to visit previously completed jobs
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