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Estimated Cost For Loft Conversion

Ever wondered how much an upgrade to a loft cost?

If you’re searching for ways to add additional space to your house, take a look at our helpful guide.

We will cover everything you should learn about loft conversions, building materials, tradesman costs, and much more…


Ever wondered how much an upgrade to a loft cost?

If you’re searching for ways to add additional space to your house, take a look at our helpful guide.

We will cover everything you should learn about loft conversions, building materials, tradesman costs, and much more…

How Much Does a Loft Conversion Cost?

Many people who have loft space choose to convert it into living space.

However, how much will it cost for an extension of the loft in 2023?

This guide we’ll go over all the expenses you need to be aware of – from the amount you’ll have to spend on materials and installation, to extra loft conversion costs you could be able to incur.

Let’s get right to it.

While the cost of converting your loft will differ depending on the dimensions of your loft as well as the kind you pick The following is what you should anticipate.

A 20 square dormer loft conversion is priced approximately £25,000-£29,000 and an area of 30 square metres dormer loft extension will be priced between £38,000 and £44,000.

For any area larger than 40 square meters You should be prepared to pay between the £50,000 mark to £58,000.

Another popular loft transformation is called a hip-to Gable loft conversion. This usually costs between £30,000 and £50,000 for a tiny 20 square meters loft conversion.

If your space is between 30 and 30 square metres If you have a space of 30 square metres, you can expect to pay between £45,000 and £75,000, whereas an loft conversion that is larger than 40 square metre can cost upwards of £60,000-£100,000.

A popular and costly extension is the mansard loft transformation. The cost for this type of conversion starts from £45,000 to £50,000 for a small job and can go up to £55,000-£60,000, while the cost of a mansard loft conversion may be priced between £65,000 and £70,000 or higher.

Loft Conversion Prices

Type of Loft ConversionTotal Cost (Supply + Labour)
Dormer loft conversion£25,000 to £58,000
Hip to gable loft conversion£30,000 to £100,000
Mansard loft conversion£45,000 to £75,000

What are the Supply Costs of a Loft Conversion?

Are you looking to save a little cash while having your loft remodeled?

You might want to consider buying the materials from a store you can do it yourself.

In the next section we will discuss the different cost of loft conversions that you could anticipate.

Loft Conversion Flooring Cost

One of the primary expenses to think about is the flooring you choose for the loft conversion.

But the question is: What is the cost of loft conversion flooring?

Loft conversion flooring costs depend on the flooring you pick. For instance vinyl flooring can cost between £6-£14 per square meter, whereas laminate costs range from £7 to £25 per sq m.

Other popular choices for flooring for loft conversions are hardwoods – which are typically priced at £35 or £45 per square millimetre. If you’d like carpeting for your loft conversion you can expect to pay between £5 and £30 per sq m.

Loft Conversion Heating Cost

In order to ensure that you have your loft converted adequately heated it is necessary to install the new heating system into it.

This could include the cost of installing radiators, which could be installed on the ceiling of the loft in order to heat the loft space.

You can buy a standard vertical or horizontal radiator at any price from  £50 to  £900 as well as electrical radiators that vary between  £90 and up £400.

Another option is to install an underfloor heating.

However, there’s a catch.

The price of heating underfloor is more expensive and will have to be completed prior to the flooring can be laid.

Heating for underfloors that are wet costs between £60 up to £80 per square meter. It works with the help of pipes in order to heat the flooring.

The other option is the dry underfloor heating that costs between £30 up to  £40 per square metres. It includes electric mats as well as wires connected to the main electrical supply to warm the flooring.

Loft Conversion Lighting Cost

Lofts can be very dark.

This is why it’s essential to incorporate as much light as you can.

This can include ceiling lighting. They start at  £7 however they can go up to  £4000 If you’re searching for something more extravagant.

Other popular lighting options include lamps. They range between  £3 up to  £1000 for table lamps, and floor lamps usually range starting at £12 through  £1800.

Advanced lighting options include smart lighting. These are controlled by electronic devices (like smartphones) and help to reduce your energy consumption and decrease the carbon footprint of your home. Lightbulbs with smart technology can be bought at a cost of  £15 up to  £170.

Loft Conversion Stairs Cost

One of the biggest expenses to think about is the cost of a new staircase. This will allow you to get into your new living space after it has been built!

The cost of supplying a new staircase will differ based on the kind of staircase you select as well as the material.

For example:

  • A staircase made of softwood could cost between £380 for straight sets of stairs up to £800 for z-shaped staircases.
  • A staircase made of wood is more costly, with prices beginning at  £1400 for a single-winder staircase, and increasing up to £1900 when you have triple-winder staircases.
  • If you want a modern look it is possible to consider glass stairs. Glass staircases are priced between  £2500 up to £4000.
  • Another option that is unique is the step made of metal, and are usually priced between  £1000 up to £3000.

Loft Conversion Windows Cost

There’s one last point to be considered:

Conversion windows for lofts to be installed.

The price of windows for loft conversion will differ in accordance with the design you prefer.

If you’re planning to install a loft conversion to a dormer You will have to think about the price of windows for dormers. They are typically priced at £150 for a small window, however larger dormers could cost as high as £300 for each window.

Another well-known loft conversion window style includes Velux rooflights. They’re a bit more expensive and cost between  £320 up to  £550. They can help create a modern and spacious living space, and can greatly enhance the look of.

What are the Additional Costs of a Loft Conversion?

What other costs of conversion should you be aware about?

Here are some.

New Boiler Cost

When you’re converting your loft you might need to engage an engineer for heating to see whether your current boiler could be connected to the new area of living. In the event that it is not possible, they might recommend the installation of the new boiler.

This is the offer.

This is a significant expense. The cost of installing a new boiler can vary based on the kind of boiler you pick because some are more difficult to install than others.

The most popular boilers are combi boilers that are priced between  £1500 to  £3500 and a heat-only boiler is priced in the range of  £1500 or £2500. You can also consider the installation of a boiler system that typically costs between  £1500 or £2800.

Underfloor Heating Cost

Lofts tend to feel less warm in winter – which is why installing underfloor heating may be beneficial to warm your new home.

As we’ve mentioned before the price of underfloor heating can vary according to the type of method you select.

The first option is to use subfloor heating that is wet.

This is a pipework system that is set beneath your flooring, allowing water to flow through. If you are hiring a professional to install it is to pay between  £90 or £190 per square meter.

Another alternative is to use the dry heating of your underfloor.

This is the process of installing electrical mats (or wires) that connect to your main electric supply within your home. Underfloor heating is the less expensive of the two options, since it ranges from £40 or £80 per square meter.

Loft Conversion Insulation Cost

Another cost to think about is the cost of installing insulation into the new loft extension.

The final cost depends on the kind of insulation you select.

For instance:

  • Sheet insulation can cost between  £15 up to  £25 per square meter.
  • Loose-fill insulation varies between  £5 and up £15 per square Meter.
  • An alternative that is more costly is blanket insulation, which has the highest thickness and typically costs  £12 up to £27 per square meter.

Tradesmen Costs for a Loft Conversion

Here’s the truth.

The cost of labour for the conversion of a loft is crucial to think about, since the work requires a variety of tradesmen. Each will offer different estimates.

To give you an understanding of costs of loft conversion work Here are the costs you can expect for every type of tradesman.

Joiner Costs

To build the loft conversion you’ll require the assistance of an expert joiner. They can help you build and set up the frame for the loft, and also assist in setting up the new frame for your staircase doors, door frames, and many more.

If you are planning a major project, like the conversion of a loft, one can expect to spend between £160 or £240 daily.

Painter & Decorator Costs

When your walls are finished then you can think about hiring a decorator or painter for painting (or wallpaper) your walls to improve the look that your loft has been converted to.

Painters and decorators typically cost anywhere from  £100 or £300 per day for decorating the look of a new area for living.

Electrician Costs

You’ll have to engage an electrician who is certified to make sure the electrical components (such as lights, appliances, lights, or floor heating) are properly installed.

Electricians typically provide a daily price between  £170 up to £340.

Plumber Costs

If you’re planning to have the bathroom fitted into your conversion of your loft, plumbing experts will be needed to put in everything – which includes the sink, toilet and shower.

In this case you can expect to pay plumbers between £200- £400 per day.

Kitchen Fitter Costs

A kitchen installation inside your loft conversion requires the expertise of a kitchen installer. They will put in kitchen cabinets as well as worktops and appliances.

A typical kitchen fitter will charge approximately £120 to £200 each day to install the average size kitchen.

Heating Engineer Costs

An engineer for heating will install an new boiler, set up radiators and connect the dry underfloor heating.

The average daily wage for a heating engineer is about PS150 to PS500 per day.

Plasterer Costs

Before your walls are decorated, it is recommended to employ a plasterer to prep your walls. This will allow you to keep them safe and prepare them (regardless whether they’re being wallpapered or painted).

Plasterers usually offer the daily cost between  £150 and  £220.

Builder Costs

Engaging a builder is among the most crucial steps to do when you are building loft conversions as they’ll be responsible for laying the foundations and construction of your new home.

A typical builder’s daily cost can vary from  £130 up to £260.

How Long Does It Take to Build a Loft Conversion?

The duration of an loft extension is essential to think about – since it will impact the final price. The longer the project takes to complete, the more costly it will become.

The amount of time needed will vary based on the kind of loft conversion that you are looking for as well as the size of your living space. Below is a table that outlines the different durations for various types of loft conversions.

The type of loft conversionSmall (20sqm)Medium (30sqm)Large (40sqm)
Dormer6 – 7 Weeks7.8 to 7 weeksFrom 8 – 9 weeks
MansardBetween 8 and 9 weeksNine to ten weeksBetween 10 and 11 weeks
From hip to the gableBetween 6 and 7 weeksBetween 7 and 8 weeksBetween 8 and 9 weeks
Lights for the roofFrom 4 to 5 WeeksFrom 5 to 6 WeeksBetween 6 and 7 weeks

Types of Loft Conversion

Have you considered the kind of loft conversion you’d like to see?

In this article we’ll discuss what kinds of loft conversions you can get, the amount they’ll cost along with the advantages and disadvantages of each.

Dormer Loft Conversion Cost

Dormer loft conversions are typically affixed to the roof of a building that is sloped vertically. It typically has vertical walls as well as a horizontal ceiling.

The cost of converting a dormer loft can range from  £25,000 to around  £58,000.

What are the advantages of converting a dormer loft?

It also gives a lot of additional space. This makes it the perfect choice for a new bedroom with a bathroom. The extra space allows the natural light to flow into the room, which makes the space appear bigger and more pleasing to the eye.

It gets better and better.

There are no restrictions since dormer loft conversions typically can be considered permitted developments if they comply with the size requirements.

This is what they say:

Because a dormer conversion requires altering the current roof, it can take more time to build as compared to other loft conversions. It could also require more structural modifications than a roof lighter loft conversion.

The most distinctive feature of the mansard loft conversion has a roof that is flat that has an inward-sloping wall that slopes 72 degrees.

Mansard loft conversions cost between  £45,000 and  £70,000.

One benefit of converting a loft into a mansard is that it’s a flexible extension that is suitable with a range of different types of properties. It’s also able to be built to complement the house.

What’s the negative?

Mansard attic extensions require planning permission prior to building it as it will require substantial modifications to the roof and the structure of the building. It’s also one of the most costly loft conversions, and could take as long as 11 weeks to finish.

Hip to Gable Loft Conversion Cost

Loft conversions from hip to gable involve converting a sloping hip roof into the flat gable ends.

The cost of a hip-to-gable loft conversion varies from  £30,000 to  £100,000.

The primary benefit of converting a gable to hip loft conversion is the fact that it increases the roof area dramatically – since hipped roofs generally have a limited amount of space. This allows for the installation of the staircase as well as a living space, and also boosts the value of your house.


The loft conversion requires you to obtain planning permission because it is regarded as an extensive roof change. It could also be costly if you have a huge roof area.

Roof Light Loft Conversion Cost

A loft conversion that is a roof light is among the most basic extensions since it doesn’t require modifications in the roofing. It merely changes to the interior and outside of your attic.

A rooftop light loft conversion is priced between  £23,000 and £54,000. In comparison to other options that cost more, this is a relatively affordable loft conversion.

That’s why many homeowners decide to go with an upgrade to their loft or roof light. It’s one of the most affordable options and will take anywhere from 4 to 6 weeks to finish.

It’s also great for those living in an area designated as a conservation zone which are not required to have approval for planning.

There are some limitations with this type of conversion, however since the roof won’t be extended, you will not benefit from additional living space, as you do with other kinds that convert lofts.

How Much Does It Cost to Remove a Loft Conversion?

Consider these suggestions:

If you have a problem in your loft conversion it could be necessary to have it taken away.

The most efficient and simple method to take down the loft is to take off the staircase and replace it with the standard loft hatch. It will cost you between  £500 or £1000.

It is also possible to look into the costs of waste removal. It could cost you between  £70 to  £180 per day for a professional firm to eliminate the unwanted items.



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