Ground Screws Are Here to Stay. But Is the Industry Ready?

It was only a matter of time before I started talking about ground screws!

Having spent a good part of my working life involved with them, it would be a little strange if they didn't make an appearance here sooner or later.

And while Work in Progress certainly isn't intended to be another construction industry blog, there are a few things I've experienced, learned and occasionally found frustrating over the years that I think are worth talking about.

So, bear with me. This one's a little more work-related, but I promise not to turn it into a technical manual.

I've spent a good part of my working life involved in modular construction and ground screw foundations, and if there's one thing I've become increasingly convinced of, it's that ground screws aren't going anywhere.

And nor should they.

We're operating in a construction industry that's under increasing pressure to build more efficiently, reduce environmental impact and find practical solutions to increasingly difficult building sites.

Ground screws have a genuine part to play in that.

But there's something that's been bothering me about the direction of the industry.

I'm not entirely convinced that the standards and working practices have kept pace with the growing popularity of the product.

From sheds to structural foundations

Go back a few years, and many people would have associated ground screws with putting up a shed, building some decking or installing a garden room.

And there's absolutely nothing wrong with those applications.

But today we're seeing ground screws being considered and specified for much more substantial structures, including permanent residential extensions and modular buildings.

Architects and structural engineers are increasingly recognising their potential.

That changes things.

When you're supporting a shed, the engineering requirements are obviously different from those involved in supporting someone's home.

Yet, in my experience, there are parts of the ground screw industry that haven't fully made that transition.

It's relatively straightforward to purchase ground screws and installation equipment. There are suppliers operating across the UK, and the market has become increasingly competitive.

Competition is generally a good thing, but the difficulty comes when price starts taking precedence over engineering, testing and installer competence.

It's one thing to sell a ground screw.

It's quite another to demonstrate that it forms part of a suitable structural foundation.

Why I believe in them

I've seen ground screws provide solutions where traditional foundations would have been extremely difficult, expensive or disruptive.

One project involved a relatively straightforward ground-floor extension. Because of the nearby trees and clay conditions, conventional foundations were expected to require excavation exceeding three metres in depth.

Anyone familiar with domestic construction will appreciate the practical difficulties involved.

Deep excavation, potentially unstable trench sides, spoil removal, restricted access and the cost of getting everything safely completed.

In this particular case, the arboriculturist recommended ground screws as a less invasive alternative.

It wasn't simply a case of choosing ground screws because they were quicker.

The arboricultural constraints had made the conventional approach particularly problematic, and Building Control ultimately accepted the alternative foundation proposal.

That's where I believe this technology comes into its own.

It can provide a way of constructing foundations while potentially reducing excavation and disturbance to the surrounding environment.

There may also be embodied-carbon advantages, but those need to be demonstrated through meaningful comparisons between equivalent foundation designs, rather than enthusiastic marketing figures.

And equally, I'm not suggesting ground screws are the answer to every project.

Sometimes conventional foundations or other piling systems will be more appropriate.

That's construction. You choose the foundation to suit the building and the ground, not simply the product you happen to sell.

So what's the problem?

My concern is that the increasing availability of ground screws and installation equipment has made it too easy to confuse being able to install a screw with being competent to deliver a structural foundation.

There's a significant difference.

A professional installation needs to consider the structure being supported, the ground conditions, the loads involved and how the foundation's suitability will be verified.

It needs engineering, records, testing and accountability.

And the whole process needs to be capable of standing up to scrutiny.

Because when Building Control questions an installation and the necessary evidence isn't available, it doesn't just create a problem for that contractor.

It risks damaging confidence in the wider industry.

Where do we go from here?

I don't believe the answer is to make ground screws unnecessarily difficult to use.

Quite the opposite.

I want to see them become a properly recognised and consistently accepted foundation solution.

But that requires the industry to acknowledge that its responsibilities have evolved alongside the applications.

We need more consistency in how foundations are specified, installed, tested and documented.

We need to recognise the distinction between products intended for simple DIY applications and engineered systems intended to support permanent structures.

And we need installers who understand that the job doesn't finish simply because the screw has gone into the ground.

I've seen first-hand what this technology can achieve, and that's precisely why I feel so strongly about getting it right.

Ground screws are here to stay.

The question is whether we're prepared to establish the confidence and consistency needed to support their future.