When it comes to screw piles, most people think of them being used for the likes of shed, deck, and garden room installation. They’re used to provide good, solid foundations with minimal work. But sheds, decks, and garden rooms aren’t necessarily intended to last forever. Home extensions are a completely different proposition. Not only does a home extension typically cost a whole lot more than the other applications. But it’s expected to last a whole lot longer. And if it goes wrong, the stakes are considerably higher – while a collapsing deck shouldn’t pull your front wall down, a collapsing extension might.

So, should you use screw piles for an extension?

Screw Piles for Extensions: Your Questions Answered

What are screw piles used for?

Screw piles were devised as a low-impact alternative to traditional foundations. Screwing deep into the ground, they provide a secure anchor for structures to be built upon. Allowing for construction to take place without the need for extensive groundworks. And in locations where conditions dictate that standard cement foundations may not be viable.

Can you use screw piles for an extension?

Yes. Screw piles can be used as foundations for a whole range of structures. From garden sheds to festival stages, and seaside piers. They are strong, versatile, and durable – typically lasting in the region of 75 years. And they can be replaced in the future, if necessary. As long as you use the right screw piles in the right way, and the right number, there is no reason why you shouldn’t use them for a home extension.

How many screw piles do you need for an extension?

The answer here obviously depends on the size of your intended extension. But in most instances, you will need to install a screw pile every 8 to 10 feet throughout your structure, depending upon the projected load. For an accurate quote, contact UK Helix.

How much do screw piles cost?

The cost of screw piles will vary, depending upon the conditions you’re working with and the length of pile you require. If you need to price up a project, get in touch with an expert supplier.

Are screw piles cheaper than concrete?

In the vast majority of cases, screw piles will be cheaper than concrete. Largely because they’re much quicker and easier to install. If you wish to, you can even install screw piles yourself by hand. If you’re working with a builder for an extension project, and you have the room for a skid steer on-site, then you can complete the installation in a few hours. And in most conditions, they will be ready for you to work with the same day.

Are screw piles any good?

Well, we think so! There are many reasons why the use of screw piles has grown in popularity. They’re low-impact, so they won’t interfere with existing structures – something particularly relevant when erecting a home extension. Screw piles are reusable and recyclable, which makes them better for the environment. As previously mentioned, they’re cheaper than traditional cement foundations. And screw piles can be installed without the need for any major site clearing or groundworks, which reduces the need for site waste disposal.  

Helical screw piles have a broad range of applications. And for home extensions, screw piles make a good choice. But it’s important to get the right equipment for the job. So, if you’re not absolutely certain, it always makes sense to seek professional advice.

UK Helix provides a full range of screw piles, brackets, and extensions. Get in touch to discuss your home extension project. 

Disclaimer –Information in this blog does not in any way constitute building advice or guidance for private or commercial building projects.


  1. Barry

    Is Building Control ok with these being used for a single storey extension? If so, do they come out and check, or just pre-approve it? Thanks.

    1. David

      I’d like to know that too!

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