How much does a loft conversion cost?
The average cost of loft conversion in London going into 2025 is between £50,000 and £90,000 depending on the design and specification of the build.
Here at Simply Loft, we have carried out thousands of loft conversions across London and the West Midlands and are therefore experts when it comes to the cost of an attic conversion. An average loft conversion cost can range anywhere from £50,000 – £90,000 and upwards. The typical cost of a loft conversion is based on many factors such as size, type of loft, where you are located in the UK and any internal specifications that are required such as windows, doors, bathrooms etc.
Because Simply Loft are part of the Simply Construction Group we can draw on experience from across our sister companies, including construction experts and architects, so we can offer an expert assessment of what is required for your project and even add ideas and innovations based on our experience in order to maximise the benefits and improvements the conversion will bring. For a truly accurate loft conversion cost, why not get a free quote today? By booking one of our no obligation quotations with a Simply Loft surveyor, you will receive a fully itemised quote, outlining the details of your loft conversion price.
Looking to Find Out More About Loft Conversion Costs?
At Simply Loft, every one of our loft conversions are bespoke. We design and build each loft conversion to our customer’s needs and that means that the price can change from one to the next so an accurate cost of a loft conversion cannot be given without a quote.
However, we have produced this guide to give you an average idea about much you can expect a loft conversion to cost.
How Much is a Loft Conversion?
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 cost of loft conversion London is between £50,000 to £70,000 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 loft extension structural design teams.
Loft Conversion Cost Breakdown
Loft conversion prices are inclusive of VAT. These loft conversion prices are a guide only, depending on the size of loft as well as internal and external specifications. Loft conversion costs include construction of a shell loft conversion to a plastered finish and includes all heating, plumbing and electrics. For an accurate quotation to find out how much a loft conversion costs for your home, book a free site survey with one of our Simply Loft loft extension surveyors.
How Much Does a Loft Conversion Cost in London?
In more recent times, loft conversion costs in London have increased due to labour shortages and material price increases. However, the cost of a loft conversion in London may still be a very viable option of adding much needed space to your home, without the time and expense of moving to a bigger property. Depending on the type of project you want to carry out to your home in London, average loft conversion costs are anywhere from £45K for basic project to £70K for more complex attic conversions. London loft conversion costs are also subject to VAT so it is important to factor this into your budgeting.
A loft conversion on a London property can add up to 20% to the value of the house, depending on its size and property location. Typically, you can expect to make back what you spend on having a loft conversion on your home and in some cases much more.
The average price for a loft conversion in London currently is around £50k including VAT, however they can be as little as £45k ranging to £100k+ depending on the size and complexity. The changing price of materials can affect these prices throughout the year, so it is always important to check with a Simply Loft representative for a detailed attic conversion cost.
How Can I Finance my Loft Conversion?
Types of Loft Conversions and Guide to Loft Conversion Prices in the UK
Skylight or Velux Loft Conversions Costs
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 to avoid high loft conversion costs as it does not alter the structure of your loft roofline. However, whilst this is the cheapest cost of a loft conversion, it may not maximise the space potential of your loft.
A skylight loft conversion is a basic 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 or skylight windows are added to maximise natural light. This is particularly important in a smaller space. Prices remain low for this sort of loft 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 and you can pass your project through permitted development, saving you much needed time.
If you’re on a tight budget, the cost of a skylight loft conversion could be the answer; and can cost as little as £45,000. As always, these figures are dependent on the size of your property and the scope of the project internally.
How Much Does a Dormer Loft Conversion Cost?
In 2025 a typical dormer loft conversion cost can vary between £50,000 up to £60,000 depending on the specification of the build. Average dormer loft conversion costs can vary quite dramatically depending on where you are located and the finer details of what you require internally in your loft conversion. For an accurate dormer loft conversion price, it is important that you seek the expertise of a loft conversion specialist. Here at Simply Loft we offer no-obligation free site surveys so you can feel safe that your loft conversion has been priced accurately and by experts. Get a free quote today.
One of the most common loft conversions we carry out are dormer loft conversions or rear dormer loft conversions, which are slightly more expensive than the skylight loft 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 or simply just for extra space; dormer loft conversions are amongst the most popular loft conversions.
With a dormer loft conversion, you don’t just maximise space by gaining an extra room in your attic; you also gain more head height. Dormer loft conversion spaces feel more spacious than lower cost equivalents such as Velux loft conversions; 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.
Average dormer loft conversion costs in London or the West Midlands vary from £50K and upwards, depending on the size of the loft extension project and the nature of the attic interior.
How Much Does a Hip to Gable Loft Conversion Cost?
Hip to gable loft conversion costs on average fall between £60,000 to £70,000 depending on the full specification. The price for a hip to gable loft conversion will vary depending on size, location in the UK and internal specifications.
Hip to gable loft conversions alter the structure of a roof and a typically found on detached or semi-detached properties. As the name suggest, this type of loft conversion is changing the edge of a roof from a hip angle to a gable end. This alteration provides property owners with plenty of extra space. Hip to gable loft conversions are often combined with rear dormer loft conversions for maximum space potential. The average cost of a hip to gable loft conversion in London is currently around £65K.
When you are weighing up the costs of a loft conversion, it is important that you seek specialist advice from a loft conversion expert like Simply Loft. With Simply Loft, you can book a free site survey, where a member of our team will meet with you on site and produce an accurate loft conversion cost and quote.
How Much Does a Mansard Loft Conversion Cost?
In terms of the exterior of a property, these breath-taking 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 the loft conversion. In most cases planning permission is required and when all is said and done a mansard loft conversion will usually be priced at least £60,000 and upwards depending on the size and the nature of any custom specifications required internally and externally.
Mansard loft conversions are sometimes required in order to gain planning permission in certain London boroughs or in conservation areas. It is important that you speak to the team at Simply Loft if you think your loft conversion design could be affected by local planning laws. The complexity of a mansard loft conversion in comparison to other types subsequently means they are one of the costliest loft conversions to implement.
Other Types of Loft Conversions Costs
For a more comprehensive list and descriptions of types of loft conversions, visit our Types of Loft Conversion section on our website. This is particularly useful, if you are not sure what type of loft conversion you will need for the type of property you live in. 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 thousands of loft conversions across London and the West Midlands and is more than likely to be able to cater for your needs.
Terraced House Loft Conversion Cost
A terraced house loft conversion will cost between £45,000 to £60,000 depending on a variety of factors. The price of a terraced house loft conversion is dependent on its size, location as well as internal specifications. Terraced house loft conversions can typically be on the smaller side versus larger, detached properties and therefore the price of a loft conversion can therefore be lower. Get a free quote today from one of our loft conversion experts.
Semi-Detached Loft Conversion Cost
Semi-detached properties can have the option of many different types of loft conversions carried out on them, including rear dormer loft conversions, skylight loft conversions and hip to gable loft conversions. If your semi-detached property also includes an outrigger at the back, then it may also be possible to carry out an l-shaped loft conversion, adding two valuable bedrooms to your home.
Depending on which of these types of loft conversion you choose, as well as the size of your roof and the type of cladding and internal finishes you require, it is hard to calculate an accurate cost of a semi-detached loft conversion.
In these instances, it is important to book a survey from a member of the Simply Loft team, so that we can take measurements on site and produce a detailed quotation with itemised loft conversion costs.
Small Loft Conversion Cost
A small loft conversion may cost as little as £45,000 depending on where you live and the exact specifications of the conversion. Small loft conversions are typically classed as skylight loft conversions (where less materials are needed) and loft pods or l-section only loft conversions. The costs of a small loft conversion project are therefore at the lower end of the scale.
How Common are Loft Conversions in London
Loft conversions are relatively common in London, as they provide an effective way to create additional living space without the need for extensive structural work or the purchase of a new property. According to a 2020 survey by the Nationwide Building Society, loft conversions are the most popular type of home improvement project in the UK, with around 28% of respondents having carried out a loft conversion or planning to do so in the future.
In London specifically, the high property prices and limited space make loft conversions even more popular. Many homeowners in London choose to convert their loft space into an additional bedroom, office, or living area to increase the value of their property and make it more functional for their needs. Additionally, loft conversions can provide stunning views of the city skyline, which is a major attraction for many homeowners.
How much value does a loft extension add to a property
The value that a loft extension can add to a property can vary widely depending on a number of factors, including the location of the property, the quality of the extension, and the local housing market. In general, however, a well-designed and executed loft extension can add significant value to a property, particularly in areas where, as is the case in London in particular, there is high demand for housing and limited space for new construction. According to a study by the Nationwide Building Society in 2019, a loft conversion can add an average of 20% to the value of a property in London, which is higher than the national average of 10%. However, it’s worth noting that this is just an average and the actual value added could be higher or lower depending on the specific circumstances of the property and the local market conditions.
Contact Simply Loft Today for a Free Quotation and an Accurate Loft Conversion Cost
Simply Loft is the leading builder of attic and loft conversions in London and the West Midlands, specialising in bespoke designs and backed up with excellent customer service and industry leading technology to track and monitor your project. We offer loft conversions for varying budgets. For a truly accurate loft conversion cost, why not talk to us today by calling 0203 285 7369 to discuss your project or fill out our simple online enquiry form to the right of this page.
We can also provide rates and costs for kitchen extensions, side return extensions, basement conversions and bathroom and room refurbishments through our sister companies Simply Extend and Simply Basement, who are also part of the Simply Construction Group.
For a comprehensive loft conversion cost breakdown, contact the Simply Loft team today!
How much value do loft conversions add London?
A loft conversion on a London property can add up to 20% to the value of the house, depending on its size and property location. Typically, you can expect to make back what you spend on having a loft conversion on your home.
What is the average price for a loft conversion?
The average price for a loft conversion currently is around £50k including VAT, however they can be as little as £40k ranging to £100k+ depending on the size and complexity. The changing price of materials can affect these prices throughout the year.
