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  • Flat Pack Extensions Cost

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

    Average Cost of a Flat Pack Extensions

    Depending on the complexity of the job, a flat pack extension usually takes 7-9 days.


    Every home owner 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 endless, from stamp duty to estate agent fees, it’s 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 the price of a traditional extension. Installing a flat pack extension is certainly going to save you a lot of money by not moving house for that extra space.

    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.

    When you’re ready for that extra space, don’t forget to compare up to 3 quotes from professional tradespeople. Not only are they reliable and trusted, but you will get the best deal by simply entering the details of your job in this quick and easy form. To give you peace of mind, you can also read reviews of the tradespeople before choosing one.

    Cost of a Flat Pack Extension

    Job Description Duration Material Cost Labour Cost
    Single storey 25 square metre flat pack extension 7+ days £25,000-£35,000 £150-£250 per day
    Homebuyer survey 1 day £400+ N/A
    Plumbing 1-4+ days depending on complexity £300+ £250-£375 per day

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    Things to Consider with a Flat Pack Extension

    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. 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.

    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. You’ll need to factor this in to the time scale, with the complexity of your structural changes adding a few days on to 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 whilst materials such as an oak frame flat pack extension tend to be more expensive, taking longer to build and install.

    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.

    Doing it Yourself

    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 whilst also being environmentally friendly.

    You would have to unearth the foundations and install plumbing, electric 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.

    Get up to 3 Quotes from Local Tradesmen Submit a Job

    Get up to 3 Quotes from Local Tradesmen
    Submit a Job

    Hiring a Tradesman Checklist

    • Always get at least 2 quotes before hiring.
    • Never pay the full amount upfront.
    • Get the quote in writing.
    • For any payment you make, always get a receipt.
    • On more expensive jobs, ask for references.
    • Check if the tradesman is a member of any trades associations.
    • Make sure the tradesman has public liability insurance.

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