How much does a Loft Conversion Cost in London?


Loft Conversion- A Dream Space in your house

Do you have such space that is absolutely free and is unused? Do you want to utilize the free space in your house? This unused space in the house is deployed for a guest bedroom, a home cinema, a library, a study room or whatever you might willing it to convert into. Loft conversion in London is very much in fashion in every house in U.K. It gives valuable feeling in your ambiance that adds extra value to your property and increase the beauty of home décor system too. London loft conversion gives fine and best returns to your investment when it comes to extend the property from a project to a valuable conversion of a free unused area in your house, says Becke Livesey, who is the director at Econoloft, one of the leading London Builders that give wings to your dreams.

Cost of Loft Conversion in London:

The type of loft conversion depends on the amount of area present in the house followed by the actual cost in conversion involved simultaneously. Small companies charge around 10-15 % less than the big companies i.e. top companies. So there are several payable amounts like A Certificate of Lawfulness or planning fees cost £86 and £172 respectively are kept separated from the loft conversion company contract and are paid by the homeowner by his own. Building Control fees i.e. around £500 in addition with VAT is also paid by home owner to the local authority or government independent company.

  • £1,150-£1,350 per square meter for a basic roof light conversion
  • £1,250-£1,450 per square meter for a dormer conversion
  • £1,350-£1,550 per square meter for some other complex options

For a two rooms and one bathroom loft conversion:

  • Mansard Conversion- £35,000–£45,000
  • Dormer Conversion- £30,000–£40,000
  • Hip to gable conversion- £25,000–£30,000
  • Roof Light Conversion- £20,000–£30,000


  • When you want to install a new Loft Staircase the design may vary from a simple wooden one to a glass one and cost of it also depend on the scale and design of your staircase. For example, if you go for simple plain timber staircase it costs around £250 whereas a staircase made from glass panels and modern banister will cost £25,000.
  • Bidvine, a best London Loft Conversion builders construct your loft room either renovating it or building a whole new room, the cost varies accordingly. The basic loft room conversion costs £11,000.
  • Loft Dormer Extension on Bidvine for base costs around £2,000. It gradually increases from 10-20% if you are going to install a new dormer on your home because the amount of construction work increases with the labour cost too.

The quotes from https://builderinlondon.uk gives suggested costs of loft conversions depending upon the types of loft conversions by London Builders.

  • Velux is the type of loft conversion that requires least cost ranging from £21,000-£41,000 involving fixing of 2 windows to roof.
  • Dormer is the most common kind of loft extension today prevailing in UK, the standard dormer costs is from £31,000-£58,000 and the L-shaped Dormer is around £40,000-£60,000.
  • Hip to Gable- In this loft conversion both the sloping ends of roof are replaced by gable wall and cost comes out to be £42,000-£65,000.
  • Mansard is the most extensive option of London Loft Conversion where one side of the roof is converted into a straight wall and flat roof, which forms a whole together new storey. The cost of this is £45,000-£75,000.

All these loft conversions are subject to change depending upon the availability of space, design and architecture, builders involved and labour involved depending on the time period.