How Much Does a Loft Conversion Cost in the UK?

If you and your family need extra living space, a loft conversion could be the answer.

You can avoid the hassle and costs of moving to a new home, it’s affordable and most of the work is done from outside of the building, this means there’s very little disruption to the occupants of the property.

As an added bonus; a few years ago the government relaxed the planning permission rules for most types of loft conversions.

But how much does it cost to build a loft conversion?

In February 2017 and again in January 2018, we sent out price requests to specialist loft installers in the south of the United Kingdom.

The figures we have published on this page are based on that research.

We last updated the contents of this page on the .

Don’t forget; this is just one of hundreds of researched prices. You can explore our complete price list here.

What’s Normally Included in a Loft Conversion Quote? (read this first – not every quote is the same)

Here is a list of everything that is included in the loft conversion prices we sourced for our property.

If you are comparing your own quotes to the ones we received, please double check that they are comparable:

loft, black and white image

What is Quotation Check?

Quotation Check was launched in 2014 with the aim of casting light onto the prices charged by tradespeople and businesses in the UK home improvement sector.

To date, we have researched over 100 prices and published our findings on this site.

Our method is simple but effective; we gather written quotes from local tradespeople and businesses and then publish an average figure on our pages.

Our Loft Project

The loft we wanted quoted for is located on a two-bedroom Victorian semi-detached property. It will require the construction of a dormer to the rear side of the roof and two small roof windows to the front aspect.

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 and more likely to require full planning permission.

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

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 almost always higher than a loft with only roof windows.

The difference can be considerable. A loft with two dormers could cost up to twice that of a loft conversion with only roof windows.

See all of the Prices We Sourced

In total we contacted nine loft conversion companies and asked them to provide us with written quotes or price estimates for a loft conversion to our two-bedroom Victorian semi-detached property in Northeast Surrey.

The chart shown below displays all the quotes we received:

Converting a Loft – An Average Price

Roof inside a loft that has been convertedTo reach our guide price, we took an average of the above-mentioned quotes.

The figures below are for a double bedroom with en-suite shower unit and toilet. As you can see from the table below, the average loft conversion cost is £42000.

LocationSmall BusinessLarge Business (5+ employees)
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here
London AreaN/AN/A
South, SW and MidlandsN/A£42000
Outer Region and NorthN/AN/A



Comparing Our Figures to Others

It’s also worth noting that back in June 2016 we gathered quotes for a smaller loft conversion to a property in Camberley and the average cost was £31000.

The price checking service Which? suggests a price of £21400 for a small loft conversion with no dormer but 4 roof windows.

They also suggest a price of £29000 for a loft conversion with a dormer and one window.

They also believe a larger conversion with two dormers and two roof windows will cost approximately £41600. All of their figures exclude the cost (labour and materials) of the shower and toilet while our prices include the labour fee for these extras.

One of our colleagues recently had a one bedroom with en-suite loft conversion built on a property in west London and the final price was £47000.

We have also received an email from a website visitor located in Kent who sourced three loft conversion quotes (one room with en-suite) and the cheapest was £38000.

The variations in price emphasise how important it is to gather your own quotes.

Every loft is different and prices will vary by a considerable amount.

Get a Personalised Quote Today

We think our research is very insightful, but as every loft is different, it really isn’t a substitute for a custom quote.

Chances are that the specifications of your loft will be different to ours, the prices you receive could be very different indeed.

Use the service below and start comparing prices based on your loft:

  • You can submit specifics of your conversion project
  • Arrange a visit and receive a loft quote with no obligation
  • This is a FREE service
Get a Loft Conversion Price

Are You on a Tight Budget?

We’ve got some awesome tips to share with our visitors.

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 as this will incur significant additional cost and will almost certainly require full planning permission.

Do accept that not every loft is suitable for a conversion and in some cases the cost can outweigh the return.

Are Loft Conversions Cost Effective?

This is a good question and one that everyone thinking about a loft conversion should ask themselves.

Will 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 conversion 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 home’s 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, the building work is less disruptive and in most cases planning permission is either not required or is fairly straightforward to acquire.


Are you working in the trade? Or are you a consumer?

If you are a tradesperson or business, what would you typically charge for a 1 bed with en-suite loft conversion?

If you are a consumer, have you gathered quotes? What figures have you received so far?

You can leave a comment at the base of this page for others to see.

Compare Loft Conversion Prices With Rated People

If you want to source quotes for a loft conversion, we recommend Rated People:


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Not ready to get quotes? See all of our cost guides here

3 Responses to “How Much Does a Loft Conversion Cost in the UK?”

  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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