Flat Pack Extension Cost

Looking to buy a flat pack extension?

This guide covers everything you need to know about flat pack extensions, from how much they cost to things you need to consider that impact their price.

Depending on the type of extension assembly required, you can expect to pay in the region of £25,000 for a flat pack extension.

Ready for a quote?

We have a range of builder near you who are ready to give you a free quote!

To find out everything you need to know ahead of your flat pack extension project, keep reading.

How Much Are Flat Pack Extensions?

Flat pack extensions can range in cost from £25,000 to £35,000, depending on the exact dimensions, materials, and the complexity of the structure. This price is considering a single-storey 25 square metre flat pack extension, for supply costs only.

Your costs will rise in line with the size of your flat pack extension, as well as any additional jobs you're having added on as a result of the build.

This could include additional plumbing costs, ranging from £250 to £375 per day, home survey costs which start at £400, and your builder labour costs, which can range from £150 to £250 per day.

Flat Pack Extension Prices

Let's take a closer look at a complete quote for flat pack extensions in the UK:

This quote gives a complete overview of the costs you can expect when starting work on a flat pack extension. As well as the actual 'kit' price for the extension itself, you will need to consider additional costs, such as homebuyer surveys, plumbing, and electrician costs.

For example, the cost of light fixtures and fittings can be in excess of £400 if an electrician needs to add new sockets, light fittings, and switches.

It's important to also note the difference between flat pack extensions and modular extensions:

• Modular extensions are built entirely off-site, delivered to your property in one complete unit.
• Flat pack extensions which are supplied as 'kits', where ready-made sections are delivered to you and assembled on-site.
• There is also a distinct difference between flat pack extensions and regular house extensions — the latter of which are far more expensive.

Additional Flat Pack Extension Costs

There are a few things to consider before planning a flat pack extension. Your property may require some structural changes such as removing current supporting walls or fixing an uneven wall. The cost of removing a load bearing wall is around £1,500.

You might need a chartered surveyor to inform you of the condition of your property before the extension, so remember to factor this cost in as well. Home surveys, as noted in the table above, cost around £400.

You’ll have to hire someone to unearth the foundations and install the plumbing, electric, and gas before the extension can be put in place, like a standard house extension. You’ll need to factor this into the time scale, with the complexity of your structural changes adding a few days onto the job as well as extra costs.

It’s worth noting that a timber frame extension can be done within a week and is the cheapest material to use. Other materials, such as an oak frame flat pack extension, tend to be more expensive as they take longer to put together.

You’ll also have to work with the expert to make sure your extension matches the décor of the rest of your house as closely as possible as this could make the value of your home decrease when it comes to selling your home.

Find Tradespeople, compare up to 3 quotes!

It's FREE and there are no obligations

Get started

What Impacts the Cost of Flat Pack Extensions?

The price you'll pay for your flat pack extension will depend on your choices:

• Size and dimensions: As with all home renovation projects, the larger your build, the higher your price will be.
• Quality of build: The higher the quality of materials, the higher your costs will be. Opting for eco-friendly materials and energy-efficient insulation will bump your price up when compared to entry-level materials.
• Choice of flat pack extension manufacturer: There are high- and low-end flat pack extension manufacturers - the more premium the company, the higher your costs.
• Additional work requirements: If your land needs significant work before the flat pack extension can be brought on-site, such as garden landscaping, garden levelling, or garden waste removal, the extra jobs will add more to your final project costs in labour fees.

With this being said, it can be cost-efficient to tab on extra garden labour work to your flat pack extension project to make the most of the labourers and gardeners already on-site to avoid further call-out fees.

Flat Pack Extension Costs vs Other House Extensions

By now, we know that flat pack extension costs are lower than those of single storey extension - but by how much?

While a single-storey flat pack extension can cost in the region of £25,000 to £35,000, you can expect costs upwards of £30,000 for a basic quality single-storey house extension, while premium quality for the same size can set you back by £65,000.

Let's take a closer look:

What Are the Benefits of Flat Pack Extensions?

Every homeowner will need extra space in their home at some point in their lives, with many people packing up and moving to a new house to gain that extra room. The additional costs you'll pay by moving house for extra space are practically endless, from stamp duty to estate agent fees, making it an expensive process.

Flat pack extensions are a great way of adding extra space to your home for a fraction of the cost of moving house, as well as being cheaper than the price of a traditional extension. But, not only are you going to have a whole extra room in your house, flat pack extensions will add significant value on to your home when you decide to eventually sell it.

Most of the building work for the extension will be done away from your home, avoiding noise, mess and disruption to your everyday life. You could have your new flat pack extension installed within a week, depending on the complexity of the situation.

Let's take a look at the pros and cons of flat pack extensions to help you decide:

Pros of Flat Pack Extensions

• ✔ Cheaper than traditional home extensions, up to 25% in some cases.
• ✔ Most building is done off-site, meaning less noise and disruption while the work takes place.
• ✔ Adds value to your home, while giving you extra space for living.

Cons of Flat Pack Extensions

• ✖ Fewer choices for more bespoke designs.
• ✖ Less availability for flat pack extensions in the UK, leading to reduced choice of manufacturer.
• ✖ Lead times may be long to get the prefab extension brought to you.

Ask a Trade

Got a question that only a tradesperson can answer? We have thousands of trades ready to answer any question you may have.

Ask your question

Can I Build a Flat Pack Extension Myself?

Whilst you could build your own flat pack extension yourself, it would take a lot of time, money and effort. It’s advised to leave a job this big to the professionals, as they are experienced and skilled in sourcing the correct materials for the extension.

It would be difficult to know where to begin doing this job yourself, and by the time you’ve got the materials, equipment and building plans together, you’d be spending the same amount of money but an awful lot more time to get the extension built and installed.

You will have to purchase a flat pack extension kit for your prefabricated extension. A timber frame extension is one of the most popular flat pack extensions, and it's also environmentally friendly.

You would have to unearth the foundations and install plumbing, electricity and gas for the extension. We recommend comparing up to 3 quotes from professionals to make sure you get the best deal for your flat pack extension.

Checklist: Hiring a Flat Pack Extension Builder in the UK

When you're ready for that extra space, don’t forget to compare up to 3 quotes from professional tradespeople. Here's what we suggest when looking to hire a builder to construct your flat pack extension:

• Remember to shop around for your quotes - even if your first price is low. Comparing at least 3 quotes will give you a good idea of the price range for builders near you.
• Make sure you take a look at the builder's portfolio of previous prefab extension builds to see the kind of quality you can expect. Look for photos, videos, and be sure to read any customer reviews to get a feel for their work ethic.
• Ensure you get a written agreement. No matter how quickly you may want the job done, a written agreement will ensure you're covered against verbal agreements as the terms are laid down in writing for both parties, helping to mitigate any potential problems during the work.
• Be sure to check if your chosen builder is insured, and holds the relevant liability for the work they're planning to undertake.

FAQs

Sources

https://www.planningportal.co.uk/permission/common-projects/extensions/planning-permission
https://www.sips.uk.com/news/the-pros-and-cons-of-a-flat-pack-house