The Cost of a Loft Conversion

There are many factors to think about when understanding the cost of a loft conversion. Things like the size of your loft and/or property, the type of loft conversion required and its location and internal specifications will all help decide the overall cost of the project.

To understand these factors a little better, we have broken down the main things to consider when you find yourself asking; so how much does a loft conversion cost?

Loft Conversion Costs

First Fix Loft ConversionDormer Loft ConversionL-Shaped Dormer Loft ConversionMansard Loft ConversionL-Shaped Mansard Loft ConversionHip to Gable Loft Conversion
  £10K – 15K cheaper than the other conversion types listed*    £35K – 40K*  £38K – 48K*  £38K – 48K*  £42K – 50K*  £45K – 55K*

*approximate costs

First Fix Loft Conversion Cost

One solution available for those working to a tighter budget is the “first fix” conversion. This allows all major preliminary work on your home to take place by us, think of it as building the new shell to your property’s roof and loft. Then, once this is completed, you are then able to make any further finishes to your new loft conversion.

Depending on the style of your property’s loft and the amount of work carried out, the cost for this type of loft conversion can be anywhere between £10K – £15K cheaper than if you opted for a full build loft conversion project.

Dormer Loft Conversion Cost

This type of loft conversion is typically the most common and a great affordable option for those looking to expand their home’s size. The average dormer loft conversion will increase the property’s size and room quantity by one extra bedroom and one extra bathroom.

Depending on the style of your property’s loft and its initial specifications, the average cost of a dormer loft conversion can be anywhere between £35K – £40K.

For exterior Dormer loft conversion ideas

For interior Dormer loft conversion ideas

L-Shaped Dormer Loft Conversion Cost

Should your property’s loft size and/or layout cater for an l-shaped dormer build, these types of loft conversions make great value for money and as an investment for your home.

Whilst the cost of an l-shaped dormer may be anywhere between 25-30% dearer than a typical dormer loft conversion, the l-shaped dormer will generally give you enough space for either two bedrooms and one bathroom, or, one luxury sized master bedroom and bathroom. They also, generally speaking, do not require planning permission and thus making them an extremely popular option that maximises on the space available.

Depending on the style of your property’s loft and its initial specifications, the average cost of an l-shaped dormer loft conversion can be anywhere between £38K – £48K.

For exterior L shaped Dormer loft conversion ideas

For internal L shaped Dormer loft conversion ideas

Mansard Loft Conversion Cost

This type of loft is mostly built in instances where planning permission is required, as a mansard loft is a great alternative that still offers a full-width conversion and ample space for the homeowner. 

Whilst the cost of a mansard loft conversion is typically around the same price point as an l-shaped dormer, the main difference here is the party wall. When a mansard loft conversion is constructed, the party wall is built up with new brickwork, allowing the conversion’s structure and internal layout to provide at least one extra bedroom and one extra bathroom.

Depending on the style of your property’s loft and its initial specifications, the average cost of a mansard loft conversion can be anywhere between £38K – £48K.

For Exterior Mansard loft conversion ideas

For Internal Mansard loft conversion ideas

L-Shaped Mansard Loft Conversion Cost

Should you require more space than what a mansard loft conversion can provide, then another great alternative is the l-shaped mansard loft conversion, which returns greatly both in size and as an investment on the property.

Whilst the cost of an l-shaped mansard loft conversion may come in approximately 25% higher than a typical mansard build, this type of loft will generally give you enough space for two large sized bedrooms and a bathroom. Alternatively, you could also have one luxury sized master bedroom and/or home office with en-suite to really make it something special.

Depending on the style of your property’s loft and its initial specifications, the average cost of an l-shaped mansard loft conversion can be anywhere between £42K – £50K.

For Exterior L shaped Mansard loft conversion ideas

For Internal L shaped Mansard loft conversion ideas

Hip to Gable Loft Conversion Cost

This type of loft conversion is more commonly built on properties of a larger scale that also tend to have bigger roofs, and are either semi-detached or detached buildings.

Whilst the hip to gable loft conversion may typically cost more than any of the other types of loft conversion, the main reason for this is the complexity of the build and its resulting newly added abundance of living space.

Once completed, the hip to gable loft conversion will give the homeowner enough space for either two large master bedrooms and sizable bathroom, or alternatively, if you’re looking to build something much more dramatic; a grand-sized entire loft bedroom with en-suite.

Depending on the style of your property’s loft and its initial specifications, the average cost of a hip to gable loft conversion can be anywhere between £45K – £55K.

For Exterior Hip to Gable loft conversion ideas

For Internal Hip to Gable loft conversion ideas

Extra Costs to Consider

When calculating everything for the final cost of your potential new loft conversion, there are also some other things that are worth considering.

For instance, fees relating to the architect’s drawings can also up the price for the project. However, Absolute Lofts will always aim to have these included in the project’s initial quotation and not added on thereafter.

Some other factors to consider include:

  • Planning Fees – £205
  • Certificate of Law Fees – £138
  • Additional Party Wall Costs – up to approximately £2,000
  • French Doors / Juliet Balcony / Bi-Fold Doors – £500 to £2,000

Now that the average property in London costs in excess of half a million pounds, the cost of having a loft conversion built on your home generally amounts to the same price as the solicitor’s fees, stamp duty and moving costs should you instead move home.

Therefore, not only is having a loft conversion a smart financial decision for the future, but it’s also less hassle than moving house completely!

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