How much does a loft conversion cost? How long will a loft conversion take?

Loft conversion cost

​The price of a loft conversion depends on lots of factors: the type of loft conversion you want, your house type (terraced, semi-detached, detached, bungalow), quality of construction, added features, roof lights, shower rooms, glazing, size, location, existing roof structure (traditional cut roof or truss roof) etc.

The following costs can be added additionally to every loft conversion costs:

• Drawings and structural calculations for planning and building regulations (£900-£3000)
• Party wall agreement (around £1000 if it is agreed surveyor), Insurance cost
• Bat survey costs (around £400)
• New boiler system and removing water tank, removing asbestos
• Roof repair cost, Render/clad existing wall cost (as you have scaffolding available)

Adding a loft room cost or Velux loft conversion cost:
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If you have good headroom in your loft (2.2m or more) you may convert your roof to a loft room. This is the cheapest and most straight forward option but still requires some work, for example: the reinforcement of the floor, a couple of skylights, added insulation, a staircase to the loft, electrics, lighting and heating, fire safety measures to comply with Building Regulations such as fire doors and smoke alarms.

This type of loft conversion’s cost will start from £20000.
Loft conversion will take 6 weeks to 8 weeks.

Dormer loft conversion cost:

You will need min 2.2m headroom in your loft or you may have to drop the existing ceiling to gain some headroom (this will add a minimum of £6000 to the final loft conversion cost). The loft conversion cost will vary with the size of dormers, structural change, materials, en-suite, complexity of the construction etc.

This type of loft conversion’s cost will start from £25000:

• A mid-terrace loft conversion starting cost is £35,000
• A semi-detached loft conversion starting cost is £45,000
• For a detached loft conversion  starting cost is £55,000 (depending on changing the roof shape to a hip to gable end )

​Loft conversion will take 12 weeks to 14 weeks.
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Mansard loft conversion cost​:

This type of loft conversion will change the whole roof and, therefore, is the most expensive loft conversion you can carry out.  This type of loft conversion’s cost will start from £50000.
These are for only guidance. 
Remember, it's important to get multiple quotes for loft conversions!

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