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Attic Conversion Costs and prices

The average cost of an attic conversion is around £40,000 but some will be considerably cheaper than this - £15,000-£20,000 - and others in excess of £50,000 if you are going for a Mansard conversion or a full roof lift conversion. This article outlines the cost of an attic conversion and the associated cost factors. 

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The property market has been ticking along quite steadily in the last two to three years although the uncertainty over Brexit hadn’t helped encourage buoyancy and optimism. Now the Coronavirus has plunged the world into an economic recession which is shaping up to be far worse than 2008; house prices will certainly be affected and many people are losing their jobs or are worried for their long-term security. If you don’t want to move then why not consider an attic conversion to create extra space? Prices for attic conversions vary depending on the size of your property and your plans for the internal accommodation. Adding a kitchen or bathroom will significantly increase the overall sum but the costs for a more modest roof bedroom are relatively modest in comparison.

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Staying put and not moving is going to become a reality for many people but happily, if you do need more space, then the option of an attic conversion is open to just about anyone. Even if you think your roof height is too low there are dormer or mansard loft conversions which can solve this problem or even roof lift conversions which involve removing the old roof and adding a new, higher-pitched roof all set up and ready to convert to accommodation inside. Our in-depth conversion guide takes you through everything you need to know about converting your attic space.

Factors that affect the cost of an attic conversion

The style of your attic conversion, the size of the roof and the choice of internal accommodation are the three key influencers on the cost of an attic conversion. Estimates are divided in simple terms into labour and materials; the larger the roof and the more complicated the job the longer it will take, and the more materials you use will clearly have an impact on the final price.

Any attic conversion estimate you receive should have a detailed breakdown of the work including a very thorough and itemised description of all the materials. It’s easy to focus on the just the interior conversion but there are other cost factors to take into account:-

  • Dormers and roof lights are ideal to flood the space with natural light but can be a considerable cost with the attendant work required on the roof structure to install them (read more about dormer window costs here).
  • A staircase will be required from the top storey to gain access to the attic and this can require remodelling work depending on where it is sited
  • Plumbing and heating will need to be extended and possibly re-routed so some people factor in a boiler upgrade. An extra bedroom won’t be too much strain on the household heating supply but a granny annexe or bedroom with ensuite could require some costly plumbing and heating alterations
  • If your water tank is in the roof then it will need to be relocated and replaced with either a sealed system or an unvented system which removes the need for a header tank
  • If you are opting for Velux windows, dormers or a mansard conversion then this will involve extensive work to the roof and many homeowners use this as an opportunity to refurbish their roof at the same time. Read more about Velux loft conversions here
  • A traditional framed roof usually found in pre-1960s houses is the easiest and most suitable for loft conversions but the rafters might need to be reinforced or upgraded to bear the extra weight. Trussed roofs require greater structural adjustment and reinforcement as generally, they support less weight and this can impact significantly on cost
  • Roofing material can alter the costings with slate roofs usually being pricier to alter than those with concrete tiles

Are there any other attic conversion cost factors?

In addition to the labour and materials, there are some additional costs which could include:-

  • Hire charges – the cost of the scaffolding and crane hire if you are opting for a roof lift attic conversion
  • Waste disposal charges – the charge for disposing of waste from the project which can be significant if you also choose to refurbish your roof or opt for a completely new roof on a roof lift conversion
  • Professional fees – a surveyor or architect will be required to draw up your plans for the conversion and their fees typically average around £1,000 plus VAT. You may also need to pay the costs for a Party Wall Surveyor if your house is terraced or semi-detached and you need a Party Wall Award. Under the Party Wall Act of 1996, you are liable for the fees of your neighbour’s surveyor too if they choose to instruct one and you will also have to pay for any damage, remedial work or making good to their home as part of the construction project
  • Surveys and consents – simple loft conversions do not need planning permission but there will be costs associated with a Buildings Inspector to conduct stage checks to ensure the construction complies with building regulations. These typically cost in the region of £400 to £800 and are organised through the local authority. More complex conversions that change the structure of the roof will certainly require planning permission as will an attic conversion in any house which is listed and/or in a conservation area. The fee for this is currently just over £170. If you live in a location where you have bats then you will need to pay for a Bat Survey which can cost anything up to £400. Bats are a protected species and any attic conversion has to be undertaken with this in mind

Why are homeowners adding attic conversions?

Converting redundant space in the roof is one of the most space-efficient and financially attractive options to create more room in your home; it avoids having to build an extension which is not always possible or desirable. No wonder so many people are doing it. Here are some of the many benefits:-

  • Create more space without having to move house – moving is stressful, expensive and ultimately not very attractive in these current challenging times
  • You might love your home and not want to move, the location is perfect and you have spent time and money decorating and refurbishing so your house is just how you want it, all you need is a little more room
  • Attic conversions can help soak up the demands of an expanding family – create a home office or studio for a business, a cinema room for all the family freeing up a reception room downstairs for another purpose, a bedroom with en-suite or a granny annexe, the choices of how to use the space are almost endless and can have a huge impact on family life
  • Loft conversions create the option of moving away from the standard style of accommodation in a Victorian or early 20th-century property and provide a blank canvas to create something open plan, original and contemporary whilst retaining the traditional styling in the main house
  • Building extensions are not always possible or permitted at the back or side of your home or you may have already extended and still need more space. Extensions are expensive for the additional accommodation you can create and also require planning permission which a straightforward attic conversion may not, providing you are not altering the roof structure or live in a listed property
  • If you have a valued garden or limited space at the back of your home, a rear or side extension will encroach on this whereas an attic conversion makes use of what is truly a redundant space
  • Using modern Velux windows, even a straightforward attic conversion that doesn’t use dormer windows can create an incredible aspect to your new rooms which are just not possible with a rear extension. Open up stunning views of the cityscape or your rural surrounds with a real wow factor using roof windows that convert into balconies but sit flush with the roofline when closed or insert French windows into your Mansard attic conversion. The new accommodation will not just offer extra space but become a valuable design feature
  • Attic conversions will increase the value of your home; Nationwide Building Society quotes a figure of 21% but some industry studies think this is on the conservative side and the real added value is even higher

What are the different types of attic conversion and the average cost of each?

Attic conversion costs will be very specific to the individual conversion, the size of the roof and the choice of interior fittings but it is possible to work on some average figures. Attic or loft conversions are broken down into different types:-

  • Loft rooms – the simplest of conversions in a loft that already has sufficient headroom so a measurement of at least 2.2 metres or more when you calculate the distance from the bottom of the ridge timber to the top of the ceiling joist. Just add a staircase for access, any necessary reinforcements to the floor, roof lights to suit your interior styling and insulation plus final fitting and decoration. An average cost for this would be £15,000-£20,000 but much depends on the choice of interior design
  • Dormer loft conversions – these are probably the most popular type of structural attic conversion. They extend outwards from the existing roof adding sections with vertical walls from the roof to create both ceiling height and floor space to the interior. They are very popular in Victorian terraced houses which tend to have lower attic voids than later properties and often limited space to extend at ground floor level. For what you can gain, a dormer loft conversion offers some of the best value for money and are priced on average between £30,000 and £60,000 depending on the final choice of internal fittings and the size of the conversion. A reasonable estimate would be somewhere in the region of £45,000
  • Hip to gable conversions – a style which is appropriate for semi-detached and detached properties where the roof has at least three slanting sides. A single hip to gable conversion fills out one of the sides by adding a vertical end wall. A double hip to gable attic conversion just means building out on both sides. Hip to gable conversions are usually done on larger roofs and are more complicated which means they start at around £40,000 and can head northwards in excess of £60,00 with an average cost of around £55,000
  • Mansard roof conversions – these are the most visually dramatic style of conversion and alter the entire structure of the roof adding a flat roof with sloping walls at an angle of 72 degrees. They can also have dormer windows. These create a vast amount of internal space but will significantly change the external aesthetic of the property. Of all current roof conversions, the Mansard is the most expensive starting at just shy of £50,000 and increasing to £70,000 on average. Read more about mansard roof conversion costs here. 
  • Roof lift loft conversions – this is a route taken by some homeowners who don’t have the headroom to currently convert their attic into accommodation. The existing roof on the house is removed completely and replaced with a new one which is engineered off-site and lifted into position by a crane. The roof is constructed to perfectly create pre-planned room designs and can literally be swapped over in the course of a couple of days. The average cost will be somewhere in the region of £30,000-£50,000 depending on the usual variables such as the roof size, choice of internal accommodation and window styling

What are the stages involved in adding an attic conversion?

It is useful to understand how the works progress for an attic conversion but the costs typically will not be broken down in a staged way to mirror this. However, if the project is expensive and complicated, most homeowners will pay the roofing company or builder in stage payments as each section of the work is satisfactorily completed.

Here is the likely programme of works:-

  • Drawing up plans – this is usually done by an architect or surveyor. The drawings will specify exactly what the final conversion will look like and incorporate all of the structural changes which need to be made
  • Apply for planning permission – this is not necessary for all attic conversions, it depends on the scope and scale of the work. If you have a listed property or a house in a conservation area then you are almost certainly going to need planning permission even if your attic conversion is minimal and doesn’t outwardly change the external appearance of the property
  • Building regulations compliance – irrespective of and independent of your planning status is the requirement for the work to be inspected to ensure it complies with building regulations. This is organised through the local authority. Building regulations cover things like floor strength and fire safety. The Buildings Inspector will not only want to look at the plans but also arrange staged on-site inspections as the work progresses
  • Work commences – once the plans are approved and all the necessary consents are in place, then the work can begin. Usually, scaffolding is erected first to allow external access to the roof and sometimes a roof cover is used whilst windows are being fitted particularly if the weather is bad
  • Access to the attic from the interior – this usually starts with the floor being strengthened and water and heating pipes re-routed if necessary. Then the dormers are constructed or roof lights fitted using a combination of working from within and from outside.
  • Interior walls – these are fitted and insulated and the new staircase added. Electrics and plumbing are added followed by carpentry and plastering. The work is inspected for the final time before interior decoration and fitting take place

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Frequently Asked Questions

Learn more about to cost of an attic conversion below.

Can you add an attic conversion to every house?

Some houses do not have sufficient standing headroom but this can be remedied by using a dormer or mansard attic conversion or a roof lift conversion. There isn’t really an attic space which can’t be converted, it just depends on how much you want to spend. Do you own a bungalow? Click here to see loft conversion costs for a bungalow.

What is the minimum height required to add am attic conversion?

The standard measurement is a minimum of 2.2 metres at the highest part of the roof pitch.

Do I need planning permission?

A simple attic conversion with roof lights which do not abut from the roof plane will not require planning permission. Anything which structurally changes the roof and/or abuts from the roof outside beyond a specified distance will require permission. If your house is listed or within a conservation area or both then you will require planning permission for even a simple attic conversion.

How can I keep the costs of my attic conversion low?

  • Pick interior accommodation which is cheaper to fit so a bedroom or workspace; if you start adding kitchens and bathrooms then this will impact enormously on the final bill and can also impact on the heating and plumbing systems in the rest of the house
  • Reducing the type and number of roof windows or roof lights can also help lower the cost of an attic conversion.
  • Sometimes looking at the bigger picture can drive down costs too. Doing more extensive construction works can sometimes represent better value for money as work can be completed more quickly than undertaking laborious and fiddly conversions which just cause the labour bill to mount up. An experienced roofing contractor will be able to advise you on the different pricing models
  • Following current plumbing and wiring routes into the attic space can save time and money in re-routing these services
  • Use professional and reliable tradesmen who are experienced and have a demonstrable track record at successfully managing and completing attic conversions. They will be able to tackle any unforeseen problems quickly and efficiently and always represent the best value for money
  • Project manage the conversion yourself and hire in different trades as you need them – this can save money but is also fiddly and complicated and can ultimately impact on how long the job takes

How long will an attic conversion take?

On average, an attic conversion will take between six to eight weeks depending on the size, scale and complexity of the project. This is a timescale calculated from when the works commence and does not include the period spent instructing the architect, negotiating with neighbours and successfully achieving planning permission.

Can I stay in the house whilst the works are being carried out?

Remaining in situ is not usually a problem with attic conversion works. Although there is always some disruption to the rooms on the upper storey, the rooms on the ground floor should remain unaffected.

Can I add an en-suite bathroom or kitchen?

You can add anything to an attic conversion providing the plans support it but bear in mind this will add to the cost of the attic conversion. If you change your mind and want to use the accommodation for something else then the plans will need to be re-drawn to reflect this and you may also need to adjust the planning permission or submit a fresh application. En-suite bathrooms are a very popular addition in an attic conversion and can make a big impact on family life as well as significantly increasing the value added by the conversion over say accommodation like extra bedrooms or office space. With enough room, an open plan living area and kitchen can be married with an en-suite bedroom below to create a self-contained unit for an adult family member such as a grown-up child or elderly relative.

Will it increase the value of my home?

An attic conversion will uplift the value of your home by anywhere from around one fifth to one quarter of its current value so it really is money well spent. The choice of final accommodation will dictate the actual increase; bathrooms and kitchens will add the most value. The cost of the attic conversion will most likely be offset by the increase in value to your property.

How can I fund an attic conversion?

Attic conversions represent a significant financial outlay and many people obtain finance based on the security of their home as a means of raising funds. You can approach your current mortgage lender for a Further Advance or Home Improvement loan providing there is sufficient equity in the property and you can satisfy the lender’s affordability criteria for the additional monthly payments. Typically, the cost of the borrowing is spread over the remaining term of the mortgage but this is still an attractive option bearing in mind the uplift in the property’s value when the work is completed.

Some homeowners will obtain funding from their roofing contractor or construction company in much the same way that you can be offered finance packages to buy a new car or three-piece suite. Not all roofing companies offer this and those that do tend to work in partnership with a third-party financial institution. Finance is usually subject to status and some schemes will be zero deposit with higher interest-bearing monthly payments whereas others which require a significant deposit of up to 50% may be zero interest with the remaining payments scheduled over just 12 or 24 months.

Middle-aged and elderly homeowners who have paid off their mortgage can raise funds via Equity Release Schemes which is a smart way to create capital sums for home improvement works and other projects or plans. There are a number of options available in managing the cost of an attic conversion.

Can I use an attic conversion to work from home?

More and more people are working from home now and Coronavirus is likely to create a permanent sea change in the working lives of many people. There are so many benefits because home working can offer the ultimate in flexibility for the family and also a huge saving in both commuting time and costs not to mention a big tick from environmentalists as a carbon-neutral option. You don’t require planning consent to work from home however, if you run a business from home from your new attic conversion there may be implications. Depending on the nature of the business, you could require planning permission; the key test is whether the overall character of the dwelling will change as a result of the business and whether your business will disturb your neighbours or create some other form of nuisance such as noise or smells. There may also be implications when it comes to Council tax and you might be required to apportion the dwelling so that some of it is subject to business rates whilst the rest remains under the auspices of residential accommodation and within the Council Tax system.

We hope this article has helped you to establish attic conversion costs. Good luck with your project!

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