London's Leading Loft Conversion Specialist

How much does a London loft conversion cost?

Looking to find out more about London loft conversion costs? At Simply Loft, every one of our loft conversions in London is bespoke. We design and build each loft conversion to the customer’s needs and that means prices change from one to the next.

However we have produced this guide to give you an average idea about much you can expect a Loft Conversion in London to cost.

A loft conversion is a great way of adding extra space and value to any home so they are great investments not only in terms of finance but to your quality of life. Depending on the size of a loft, an average loft conversion in London can cost between £30,000 to £50,000 and above for larger and more complex projects, but this is dependent on many different factors such as fixtures and fittings, size and type of loft conversion build and whether you require our professional services such as architectural and structural design teams.

Loft Pod
(L-section Only)
Approximate Cost*

Skylight or Velux Loft Conversion
Approximate Cost*
£25k - 30k

Dormer Loft Conversion
Approximate Cost*
£27k - 50k

Hip To Gable Loft Conversion
Approximate Cost*
£42k - 50k

Mansard Loft Conversion
Approximate Cost*
£40k Upwards

* Prices Exclusive of VAT. Prices are a guide only depending on the size of loft as well as internal and external specifications. Prices include construction of loft conversion to a plastered finish, includes all heating, plumbing and electrics. For an accurate quotation book a free site survey with one of our Simply Loft surveyors.

Types of Loft Conversions and Guide Prices

Skylight or Velux Loft Conversions

The most cost effective way of converting your loft is to carry out a skylight loft conversion if your property allows, which is the cheapest method as it does not alter the structure of your loft roofline.  However whilst this is the cheapest it may not maximise the space potential of your loft.

A Skylight loft Conversion is a basic London loft conversion which can be installed in most properties provided there is enough head height from floor joists to the bottom of the ridge beam (2.2m).

Velux windows are added to maximise natural light. This is particularly important in a smaller space. Costs remain low for this sort of conversion because Simply Loft are not required to change the structure of the roof. As if that wasn’t enough, the added benefit is that planning permission is generally not required.

If you’re on a tight budget a skylight loft conversion could be the answer; and can cost as little as £30,000. This is dependent upon the size of the property and the internal specifications.

skylight loft conversion cost

Midrange – Dormer Loft Conversion

One of the most common loft conversions we carry out are dormer loft conversions which are slightly more expensive than the skylight conversion, but with the benefit that it comes with more space potential.

Ideal for families looking to add another bedroom to make room for new additions, dormer loft conversions are amongst the most popular loft conversions in London.

With a dormer loft conversion, you don’t just maximise space by gaining an extra room; you also gain more head height. Loft spaces feel more spacious than lower cost equivalents; and planning permission is still not usually required unless the property is a flat or in a conservation area.

Dormer loft conversions are usually built to the rear of the property but can also be carried out to the side or as window dormers which work well in some conservation areas.

Dormer loft conversions in London usually cost anywhere between £32,000 and £50,000 depending on the size of the project and the nature of the interior.

dormer loft conversion cost

Higher Cost – Mansard Loft Conversion

In terms of the exterior of a property, these breathtaking mansard loft conversions are often considered the most aesthetically pleasing. Perhaps unsurprisingly, they’re also usually the most expensive.

A mansard roof features a slope of at least 72 degrees. It’s practically vertical and this maximises the space available within.  In most cases planning permission is required and when all is said and done a mansard loft conversion will usually cost at least £45,000 and upwards depending on the size and the nature of any custom specifications required.

mansard loft conversion cost

Other Types of Loft Conversions

For a more comprehensive list and descriptions of types of loft conversions click on our Types of Loft Conversion section.  If you are searching for something more unique or you feel your loft conversion could be more complex than the average, then take a look at our complex loft conversions section of our website.

Whatever loft conversion you are searching for, Simply Loft has carried out hundreds across the entire city of London and is more than likely to be able to cater for your needs.

We can also provide rates and costs for kitchen extensions, side return extensions, basement conversions and refurbishments all over London through our sister companies Simply Extend and Simply Basement, who are also part of the Simply Construction Group.

Contact Simply Loft today for a Free Quotation

Simply Loft is the leading builder of loft conversions in London, specialising in 100% bespoke home improvement projects.  We offer something for just about every budget. For a truly accurate cost, why not talk to us today by calling 0800 917 7571 to discuss your project or fill out our simple online enquiry form.

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