How Much Does it Cost to Convert a Loft?

Thank you for visiting our website here at Quotation Check and our loft conversion cost guide. Our site contains over 100 pages of researched cost and price guides for various jobs around the home. You can see our full price list here. This page was last updated on .

Up until now, we have avoided researching the cost of larger projects that can vary in price.

However, due to several requests from visitors to this site, we decided to investigate average loft conversion prices in the UK. We used a property in Camberley, Surrey for our price guide.

We hope this conversion price guide is useful for you, but don’t forget that every loft is different and the prices given to you could be very different to the figures we received.

The Loft

Loft dormer and roof window

Typical attic dormer and roof window on the same aspect

The loft we have is on a two bedroom semi detached property. It will require the construction of a dormer to the rear side of the roof and two roof windows to the opposite side. We want one double bedroom with an en-suite with a bath/shower unit.

It’s important to understand that there are several different types of loft construction:

  1. Roof windows but no dormer – good light penetration but compromises on size/space. These are usually the cheapest.
  2. Roof windows and dormer – extra space/headroom and extra light through roof windows.
  3. Dormers but no roof windows – maximum possible space but also more expensive.

Roof windows are secured at the same angle of the roof thus allowing extra light into the area.

Want to know how much a Velux-type roof window costs to install?

Dormers protrude from the roof and create extra space and more importantly headroom.

You may have to install a dormer to meet building regulations for headroom at the top of the staircase. This depends on the location of the stairs, whether it’s in the centre of the loft or slightly to the side where headroom is reduced.

The cost of a loft conversion that requires a dormer is higher than a loft with only roof windows. The difference can be considerable.

Loft Conversion Cost

We contacted eleven loft conversion companies and asked them to provide us with written quotes or estimates for a loft conversion to our two bedroom semi-detached property in Camberley, Surrey.

The figures below are for a double bedroom with en-suite, we only gathered quotes for one property in Camberley, so apologies for not being able to show typical examples from different locations around the UK. As you can see from the table below, the average loft conversion cost is £31000.

LocationSmall BusinessLarge Business (5+ employees)
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London AreaN/AN/A
South, SW and MidlandsN/A£31000
Outer Region and NorthN/AN/A

What is Included in the Figures Above?

Here is a list of everything that we included in our loft conversion cost estimate:

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If you liked our guide to loft conversion costs, you can explore more of our research here:

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How Reliable are the Figures on This Site?

The prices you see on Quotation Check are based on written estimates and quotes given to us by real businesses trading in the UK.

This site’s goal is to shed light on prices charged by tradespeople in the UK so you can avoid rogue traders who overcharge.

Our service is a great resource for those wishing to budget for home improvement projects, we have also been cited and referenced in several publications both on and offline:

I’m on a Tight Budget – Help!

Here are some tips for homeowners that are on a tight budget and want to maximise their profits on a loft they wish to convert:

Understand that bathrooms, shower units and dormers are the most expensive part of the loft conversion. If you can avoid some or all of these you can make a saving.

Can you do some of the work yourself? Such as painting and decorating? Some DIY enthusiasts may even want to install their own bathroom, carpets or flooring. You could get the loft converted and all the electrics and plumbing installed, anything remaining could be done by yourself or someone you know in the trade who could complete the work at a lower price.

Avoid things like increasing the height of the original roof, this will incur significant additional cost and planning permission. Accept that not every loft is suitable for a conversion and in some rare cases the cost can outweigh the return.

Is Converting the Loft Space Cost Effective?

This is the question every homeowner should try to answer; would you get back more than you spent if you were to sell the property?

Here are some simple steps we suggest you follow before instructing a company to convert your loft:

  1. Look at houses in the neighbouring area, note down any that have had the lofts converted.
  2. Check past sold prices on Rightmove and compare these to houses on the same street that haven’t had the loft work done.
  3. By comparing the difference in price you should get a rough idea of how much value a loft conversion will add to your property. Be aware that prices fluctuate over time.
  4. Also look at larger houses in your area, if you have a 2-bed semi then look at 3 bed semis that have been sold recently.
  5. Avoid looking at Estate Agent asking prices, instead look at sold prices which are more accurate of the true value.

Also, do bear in mind that bathrooms or en-suite bathrooms/showers are the most expensive part of the conversion. Can you convert the loft into just one or two bedrooms? Do you really need that extra bathroom?

Based on our experience and research, loft conversions are a great way to add space and value to your home. They are usually cheaper than a typical extension and in most cases planning permission is either not required or is fairly straight forward to acquire.

Don’t Forget This:

The roof used in our cost example is constructed from trussed timbers, so additional strengthening is required. This is in the form of floor and roof ridge steel joists. If your property was constructed pre 1970’s then the roof may have been constructed with framed timbers which require less strengthening.

Trussed lofts are more expensive to convert than older houses with a framed roof construction.

Our loft conversion was for only one dormer, there was scope for a second dormer to the front of the property. This would have allowed enough space for two bedrooms instead of one. We estimate that this would cost somewhere in the region of £40-42,000.


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3 Responses to “How Much Does it Cost to Convert a Loft?”

  1. SamMay 1, 2016 at 6:51 pm #

    Need a
    Log double sided ext
    Rear Lshape ext

  2. SamMay 1, 2016 at 6:53 pm #

    Need to build loft
    Double sided ext
    Rear L shape ext

  3. Kenneth FerchAugust 16, 2016 at 11:23 pm #

    This quotes seem in line with this article I found on the web, [link removed]

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