Loft Conversion Cost in London 2025

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Our Pricing

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Loft Conversion Price Calculator
Prices at a Glance

Please note that these are average prices, and as such should only be viewed as an estimate.
Step 1 of 5

Step 1: Basic Information

Step 2: Type of Property / Loft Conversion



  • L-Shape: for Victorian and Edwardian Terraced houses.
  • Doomer Conversion: for Terraced and End of Terraced houses.
  • Hip to Gable: for Semi Detached and End of Terraced houses.
  • Mansard: for Victorian Terraced and End of Terraced houses.

Step 3: Windows Details

Step 4: Loft Size

If you are unsure about the loft size, please provide the house width and length.
Alternatively, you may select “Don’t know” and request a free house/site visit from our expert for measurement and estimation.

Step 5: Contact Details


Type of Loft ConversionAverage CostTimescale (weeks)
Velux£30,0004-6
Dormer£45,0006-8
Hip-to-Gable£55,0006-9
Bungalow£75,00010-12
Mansard£58,0008-10
Shell Only£35,0005-7
L-Shaped£50,0006-9


Our Loft Conversion Plans Package
Stages of a Loft Conversion

We offer a complete package which takes our clients through a few different stages before and after the build, which are broken down into the main two below.

1
Loft Conversion Plans & Structural Calculations

We offer plans drawn up for any loft conversion, by an experienced architect. You will then be able to see laid out exactly what stages will happen and the changes to achieve the final product. A plan is an excellent way of seeing the structural changes that need to be made on the property. We will work with you every step of the way to achieve your desired final product.

2
Planning Permission & Application

We understand that planning permission can feel complicated and daunting to those who have not gone through the process before. We pride ourselves on our years of experience and expertise not only handling planning permission but also advising our customers on the best way to submit council application forms.

We offer the whole package as detailed above for a fixed price of

£1500 + VAT

Straightforward and Honest Pricing
Straightforward and Honest Pricing

Dormer Loft Conversions

Dormer loft conversions create a box like shape that completely replaces one of the slopes of the existing roof. This is a great choice and very popular amongst clients, as it means full sized windows can be added into the new space. As Dormers typically involve completely rebuilding one of the roof pitches, this means it will generally cost more than a rooflight or Velux conversion. We would generally suggest a price of between £35,000 and £55,000 for a typical dormer, whereas an L-Shaped dormer will need a corner built into it will will add more to the overall cost.

Hip to Gable Loft Conversions

Hip to Gable loft conversions are wonderful additions to any property with a roof terrace, and most homeowners feel very lucky to have one as there are many possibilities in creating more space for your home. If your home is part of a detached house, then you will have the option to create the loft conversion on either side of your property. Hip to Gable loft conversions means that the roof slope is completely replaced and a brick wall added with a dormer to make use of all available space. We would normally advise that such a loft conversion would be charged between £40,000 to £65,000 as a ballpark figure.

Mansard Loft Conversions


A typical Mansard loft conversion will be created with a flat roof space and could even add as much as an extra storey to your home, sat ontop of the existing building. Mansards will always require planning permission due to the scale of the project and as the overall outline of the property will change. Due to these additional elements a Mansard loft conversion is undoubtedly the most expensive option, but will always deliver the most amount of space for this kind of property. We would normally suggest a budget of between £50,000 to £70,000.


Our Services.
Our Services.
specialists in loft conversions

Dormers
Dormers
click here for more info
Hip to Gable
Hip to Gable
click here for more info
L-Shaped
L-Shaped
click here for more info
Terraced
Terraced
click here for more info


Our Testimonials.
Our Testimonials.

EXCELLENT WORD OF MOUTH REPUTATION

EXCELLENT WORD OF MOUTH REPUTATION



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