Loft Conversion in London: What Are the Costs?

lofts conversion london aegle properties-pic

By Ema Globyte on Dec 24 2017

Opting for a loft conversion in London isn’t only a cost-effective way to use the full potential of your home – it is also a great way to substantially increase the value of your property.

But, how much can you expect to spend on converting your unused loft into a bright and airy living space? Are there particular types of loft conversion in London that are more affordable than others?

Generally, extending into your attic is one of the quickest and most practical ways to create extra space in your home, without the need to steal any from your garden. But there are multiple ways to do so, and some types of loft conversion in London will cost more than others.

To give you a better idea of which conversion type would be most suitable for your home and budget, we have listed four main types of loft conversion in order of cost, with the one that’s likely to require the smallest investment at the top.

Of course, prices may vary depending on the finishing touches, but this will help you understand what’s out there, and how much money you may need to put aside for a loft conversion in London.

Roof Light aka Velux Loft Conversion, £20k – £30k

A roof light, or a velux loft conversion, is one of the most popular types of loft conversion in London, possibly because it is one of the most cost-effective and least disruptive ways to transform unused roof space into living space. It involves only building on existing roof line of a property, so you don’t make any structural alterations to your home. As you won’t need to extend the space externally, roof light loft conversion can cost up to 25% less than a dormer or mansard conversion.

Dormer Loft Conversion, £30k – £35k

A dormer conversion is the homeowners’ most popular choice, perhaps because this conversion type offers more height and space in a room than roof light conversion, without costing you as much as a mansard conversion. A dormer loft conversion involves making an extension to your existing sloping roof, which projects vertically out to create the additional living space.

Mansard Loft Conversion, £35k – £40k

Loft Extension North London
A mansard conversion is one of the more traditional types of loft conversion in London – and the most versatile. This type of conversion has a flat roof, and is situated at the back of a home. Its back wall will slope inwards at an angle of 72 degrees, and the windows will usually be housed with small dormers. The mansard conversion may require a planning permission, due to the structural changes you will need to make.

Hip-to-Gable Loft Conversion, £38k – £45k

Hip-to-Gable conversions are increasing in their popularity in London. As many properties have a regular roof with a sloping side, existing space for loft conversion in London is often limited, making it difficult to convert your loft without extending the property. Hip-to-Gable extension provides the perfect solution for that, as it creates an extension from the sloped roof out to the external wall, filling in the space in between. It is a popular option for semi-detached or detached properties with a ‘hipped’ roof in London.

So, whether you are looking to create a beautiful and airy room where you can relax and unwind, or a guest room that makes your guests want to stay forever, a loft conversion could transform your unused roof space into your ideal space.

If you are considering a loft conversion in London, why not have a quick chat with us?

Drop us a call on 020 7193 6511 or an email (, and we’ll be happy to advise on where to start.