How Much To Build An Extension – Last year I asked our architects to design several extensions to my house and the brief was simple: “I want the house of my dreams”.
As I speak to homeowners on a daily basis, I thought it might be useful to create a guide explaining exactly how much it costs to build and extend in the UK.
How Much To Build An Extension
It gives average construction costs for many different types of popular extensions; I hope you find this useful.
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If you have just decided to extend your house, I recommend that you start with a rough calculation. First, calculate approximately the desired size of your extension in m2. Once you have this total, multiply it by the average construction cost per m2.
So if you calculate that your ground floor rear extension will be approximately 30m2, the total build cost will be: £45,000 – £75,000.
One of the biggest deciding factors when planning your extension is the type of finish you want. Some builders will take a little less time to complete but will also charge less. There are also high-end builders who are meticulous and spend much more time on details, but charge more to compensate for the extra time spent.
Where you live also plays a big role in how much builders will charge to build your extension.
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The cost of single storey side extensions is determined by the depth of your home. If you have a fairly wide and shallow house, it will cost you less. But if you have a narrow, fairly deep house, your side extension will have a larger footprint and will be more expensive to build.
Due to economies of scale, smaller side extensions are generally slightly more expensive per m2 than larger extensions.
It’s also important to think about what type of room you will include in your single-storey side extension. If you want to increase the size of an existing living room, the overall cost can be low.
If you want a new home office, main floor bathroom or laundry room, the materials and labor required will be greater and, therefore, the overall construction cost will be higher.
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It’s important to set a clear budget before starting your project, as expansion costs can quickly spiral out of control. It is also important to have an emergency fund. We recommend leaving 10-15% of your total budget in reserve in case you need it. Extensions can be complex and often involve unforeseen situations which may require creative thinking on the part of your architect and cost your builder more money.
As with all extensions, the quality of the finish is a determining factor. For example, what type of room will you have on the first floor? If it’s just one bedroom, the costs of carpeting and painting can be relatively inexpensive. However, if you want a large bathroom with a freestanding bathtub and stunning porcelain tiles, material costs can add up considerably.
Materials for such extensions are prefabricated off-site. This means that the time it takes to build them is much faster than the time it takes to build an extension with a single layer of bricks.
These are slightly more expensive than conservatories. The quality of construction will be much better than uPVC and aesthetically these extensions can look great.
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Orangeries can be more expensive than uPVC extensions as they are often part masonry. Windows are also usually made of hardwood and are often fitted with elaborate roof lanterns rather than a simple skylight. This option offers much more daylight but also provides a feeling of space thanks to the higher ceiling.
If you’re looking to add some much-needed extra space to your home, this is definitely the most cost-effective method. Since you are working within an existing structure, less labor and fewer materials will be required.
You may need to reinforce the floor and increase the insulation between your joists, but overall this is a very cost-effective option.
This type of loft extension is slightly more expensive than a Velux extension as your builder will need to remove part of your roof to add the new dormer window. It will take longer and the materials will cost more.
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The benefit of this type of loft extension is that it creates more usable living space in your loft because it increases the overall height in the area immediately below the skylight. So, the larger the dormer window, the more space you can create in your attic.
This option is one of the most common types of loft extensions available in the UK. This involves removing one side of your home’s roof and turning it into a vertical brick wall called a “gable.”
You can also combine this option with a rear dormer via Permitted Development. This creates a large amount of usable space in your attic.
The size of the space will be determined by the size of your existing attic and the height of your ridge. The bigger this space, the more things you can create. If you have a terraced or semi-detached house, this option will create a master bedroom and an adjoining shower room.
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This type of loft extension is less common and is usually found in more traditional homes. They consist of a horizontal roof and the rear part can be almost vertical.
This creates a large amount of attic space, but can cost more to build than the three options discussed above, as it requires rebuilding the entire roof.
This type of garage is a freestanding structure, but part of the garage rests on the structural support of an adjacent building, usually your home.
This type of garage is the most common to convert. As it is already attached to the main house, there will be less construction work. You can often use electricity and plumbing from the main house, which can be easily transferred to the new space.
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It’s also a very economical way to create much-needed living space, as you will only need to demolish the partition to increase the size of your living room.
A built-in garage is where your car is parked within the main structure of your home and has an interior door that opens into the main living space.
These are also very common and are the cheapest to convert as they are already part of the main house. This means you won’t need to rebuild the roof or wall like you would with an attached or detached garage.
A detached garage is where your vehicle is parked in a separate structure and therefore not attached to your home.
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This type of garage conversion is the most expensive of the three options, but is generally much cheaper than a side extension. Because it is not connected to the main house, it is more difficult to add water, electricity and plumbing. But if you want to create a beautiful home office where people in the main house will be less distracted, this is the perfect space.
This type of extension is the most expensive due to the amount of construction work and the expertise required to carry out the work.
There’s a lot of groundwork to be done: digging the basement, supporting the existing foundation, and protecting against moisture.
Extras: The cost above is within the budget range of the mid-range versions. But there are plenty of opportunities to add cool features to basements. For example, if you want a little more natural light, you can choose to walk on skylights. They are also perfect spaces for a gym or home theater.
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Labor: This is one of the largest costs when creating a new bathroom. This will include the removal of all old fixtures and fittings and all old tiles. Your plumber will then prepare for the first repair, usually carrying out all new pipework and fitting the shower pan, toilet and bathtub.
Your tiler will then have to carefully lay all of your tiles, whether on the floor or on the wall. Once this process is complete, your plumber will install the faucets, shower heads, etc. He will come back for the second revision where he will add things like.
Ingredients: These may vary depending on the quality of the product. On average, a toilet, shower, sink and bath can cost as little as £3,000; This is much less than the effort put into assembling them.
Tiling: Keep in mind that the cost of tiling can vary greatly. It’s also worth noting that if you opt for detailed mosaic tiles, these will be more expensive than larger porcelain tiles. They also bring in someone more knowledgeable to apply correctly.
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Frames and doors will likely be MDF
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