This article we’ll review the various expenses you could expect in the case of flat roof extensions. We will discuss the total cost of a flat roof extension as well as the cost of supply as well as the labour expenses and the removal cost of a flat roof, and any other costs that could be incurred by this kind of project.
How Much Does a Flat Roof Extension Cost?
An extension can be the perfect way to upgrade your home. There are many possible possibilities to achieve with the extra space. When compared to other kinds of extensions, flat roof extensions tend to be an extremely cost-effective alternative.
Flat roof extensions can provide lots of space and are a good alternative to moving to a bigger house. This is crucial if you are happy with your home but need to make room for your expanding family.
As opposed to pitched roofs, flat roofs are a lot more simple to construct and offer the possibility of building an extension terrace on top of the flat roof extension and later time.
Additionally, any extension will increase the value of your house, which is great in the event that you want to sell your home in the near future.
We will also discuss the durations you can anticipate for this kind of work along with the different kinds of extensions as well as the benefits when you choose flat roof extensions. A renovation is a massive and lengthy task. This is why you should not think of any extension to be affordable.
But it is true that making the investment in your home is the best option for your family and prospective buyers in the near future. The cost you could expect to pay for an extension to your flat roof is between £30,000 and £75,000.
The cost will be determined by various aspects, including the dimensions of your extension accessibility, the materials employed, as well as the location of your home in the UK.
People who work in and around London areas are likely to pay higher for this kind of work than those who work in areas in the North or other regions in the UK.
Flat roof extensions are likely to cost about £1200-£2500 for a square metre, on an average. If you are aware of the extent of your expansion plans, this will give you an idea of the amount you could be able to expect to spend for the project.
What are the costs of supply for flat Roof Extension?
While it’s not recommended you finish an extension of your flat roof by yourself, you might be able to do parts of it yourself. This is an DIY project.
Additionally, if you’d prefer to purchase the materials separately, and then work with an expert contractor at an earlier date, you might be interested in knowing the costs of an extension of the flat roof.
| Type of Supply | Average Cost |
| Felt roofing materials | £2-£10 per square metre |
| Rubber roofing materials | £9-£12 per square metre |
| Fibreglass insulation materials | £6-£10 per square metre |
| PIR insulation boards | £5-£15 per square metre |
| Spray foam insulation | £5-£12 per spray can |
| Adhesive and sealant | £40-£60 |
| Edgings and drip edge for roof | £100-£200 |
| Roofing trims and batons | £90-£180 |
| Flooring installation | £7-£60 per square metre |
| Radiators | £60-£300 per radiator |
| Windows | £300-£800 per window |
| Internal doors | £50-£200 per door |
| External doors | £300-£500 per door |
| Lighting | £40-£100 per light fitting |
| Painting and decorating | £300-£600 |
What are the Additional Costs of Extending a Flat Roof?
In the case of an extension to your flat roof it is possible to incur additional expenses that you are required to budget for. In the following section we’ll discuss the other tasks that you might need to complete when you are considering an extension for your flat roof.
Painting the Exterior of a House:
No matter if your home is coated or not, it’s a good idea to have the entire house painted once you’ve completed an extension of your roof that is flat.
When you build extensions, your new portion of your home may be quite different from other parts of the home since the construction materials are fresh and unweathered.
The price for painting the exterior of your house is between £500-£1200 per square metre, based upon the dimensions of your house as well as the grade of paint.
Garden Waste Removal:
If you are planning to have an extension that is built in the rear of your house it is possible that your work produces lots of garden debris. The garden waste should be separated from the normal garbage.
If you’ve got a lot of it, then you’ll have to engage an expert to take it away for you. The typical cost of garden waste removal ranges from £100 to £200.
Underfloor Heating:
Underfloor heating can be an energy efficient method to warm your new room. As you’re working on building the extension it’s a good moment to install the underfloor heating to ensure you don’t need to remove the flooring in the future.
The typical cost for installing new underfloor heating in the extension you are considering is between £500 and £2000 depending on the size of your room and the kind of underfloor heating you decide to use.
Skip Hire:
A skip is a crucial aspect of having construction work done on your house. There’s going to be plenty of trash when installing an extension of the roof and it is essential to rent an appropriate skip for the job.
The typical cost for skip hire is between £250 and £450 in accordance with what size you want to hire the dumpster and the duration you’ll require it for.
Costs for Tradesmen to Extend an Flat Roof
If you are planning to install an extension for your roof that is flat you’ll need to contract with a variety of contractors to finish the job.
The table below shows the fees per hour and day that you will be charged for different contractors.
| The type of contractor | HOURLY RATE | DAILY RATE |
| Builder | £20-£35 | £100-£180 |
| Tiler | £20£40 | £100-£200 |
| Plumber | £35-£45 | £100-£200 |
| Electrician | £50-£100 | £150-£300 |
| Plasterer | £30-£50 | £120-£200 |
| Decorator | £20-£50 | £100-£200 |
| Joiner | £35-£45 | £100-£200 |
| Roofer | £30-£40 | £100-£180 |
| Kitchen fitter | £20-£30 | £100-£180 |
How long Does it Take to Construct a Roof Extension?
If you’re having an extension of your flat roof constructed and you’re wondering how long it will take.
The duration of an extension can vary based on many factors like the extent of your extension as well as the amount of contractors that are working at time, as well as any extra work you are working on simultaneously like an installation for a bathroom or kitchen installation.
On the average, expect an extension of your flat roof to take anywhere from 8-14 weeks. It is advisable to talk to your contractor before construction starts to give you an idea of the timeline.
The contractor you choose should be able give you an overview of what has to be completed and how long it will take.
Types of Flat Roof Extensions
Flat roofs were traditionally simple in the sense that they were a kind of extension of the home with flat roofs. A contemporary flat roof extension However, it can also include other features to make it seem more attractive. In the following section we’ll look at different kinds of roof extension with flat roofing, and the advantages and disadvantages of each.
Flat Roof Extension with Lantern:
An extension of the roof that is flat that has the lantern has a big window at the center of the roof extension. This is very beneficial for those who want to bring plenty of light into your room.
Furthermore, this kind of roof extension with a flat roof is extremely attractive. There is only one issue: the window on top will have to be maintained regularly since it will accumulate lots of dirt and other debris.
Pros:
- Attractive and aesthetic
- It allows a lot of light into your home.
- Modern design
Cons:
- It must be cleaned often
- Costly
Overhang Flat Roof Extension:
Overhang flat roof extension is exactly as the name implies, it is an overhang component of the roofing. This is beneficial if contemplating having doors and windows fitted on the flat roof extension as it will prevent rain from entering unclosed windows or doors.
Many people opt to build a huge overhang, which keeps the room cool and shaded. It also gives an area in which you can relax under the shade.
Pros:
- Shades the sun
- Ideal for extensions with big windows and doors.
- It keeps the elements out of the extension area
- Overhangs that are large can offer an attractive shaded area for sitting outdoors
Cons:
- It can be costly
- Might not allow enough sunlight.
The Benefits of a flat Roof Extension
Flat roof extensions can offer many possibilities for your family’s home. They allow you to fully customize your home, and offer plenty of space for growing families.
One of the great things when you build an extension to the flat roof is the fact that there are many benefits associated with this kind of project.
Below are a list of advantages of putting in an extension with a flat roof for your home:
- Provides extra living space
- Enhances the worth of your house
- Perfect for families that are growing.
- Unique and customizable area
- Provides extra storage space
- You may also add an outdoor terrace to the floor above
- Certain types allow plenty of light to come into the house
A flat roof extension for a myriad of things. You may have an idea of what you would like to accomplish with the extra space. If you’re still not sure then take a look at the below list of ideas for flat roof extensions for some inspiration.
Here are a few of the most commonly used applications for flat roof extensions:
- Extra storage space
- Office space
- The home fitness area
- Bathrooms with additional bathrooms
- Bedroom spare
- Additional living space
- Utility room
- Conservatory
These are only the most frequent uses of the extra space. You aren’t restricted in possibilities for what you can do using the extra space that is provided by an extension. With just an imagination, you could make whatever you like with the extra space.
How Much Does it Cost to Remove a Flat Roof?
There are many reasons you may need to get rid of the flat roof. For instance, if you’ve recently moved into a property with an extension of the roof that is flat that you’re not satisfied with, you might want to take it off it, or substitute it for a different one.
The removal of the flat roof extension could be quite a big undertaking depending on the kind of extension and the way it was built on the property.
The cost for removing the extension of a flat roof is between £3000-£5000. The flat roof extension cost to remove will cover all the necessary costs associated with this type of job, including making payments to contractors, covering the entire equipment needed to remove the existing extension, and taking away all the debris. When the flat extension of your roof is removed, you’ll be required to decide what you would like to do with the remaining wall.
It’s likely you’ll have to engage a contractor to do some extra building work in order to seal off the open wall. The builder is usually charged between £20 and £35 per hour to construct a brand new wall within the opening.
