National Grid has just wrapped up the UK’s trial of 3D-printed concrete foundations for electrical substations – and the verdict is well worth paying attention to. Whether you’re laying down the foundation for a 132 kV compound or quoting for groundworks on a battery storage project, this game-changing tech is not far off on the horizon. So what do you need to know?
Key Takeaways
In early 2026, National Grid announced that their test run of 3D-printed concrete foundations passed with flying colours in both the lab and out in the field, marking a genuine UK first. The immediate focus is on lower-risk applications, like auxiliary equipment bases and cable trench covers, with a clear path carved out for more critical areas of the substation as the data starts to pile up over the coming years.
- 3D-printed concrete foundations work in a totally different way to the traditional poured equivalent – they use a custom-made concrete mix that’s extruded layer by layer on-site, and you can even do away with traditional formwork altogether.
- UK civil engineers delivering groundworks and earthworks on substations all over the country – England, Scotland, and Wales – need to stay on top of this now, even if it’ll be a couple of years before it becomes mainstream.
- The right foundation is crucial for a stable build – and 3D printing just gives you another tool to add to your belt rather than replacing everything that’s tried and tested.
- Keep an eye out for the benefits – including up to 56% less concrete used, faster build times, improved safety performance, and estimated reductions in embodied carbon of around 65% on bigger projects.
- Getting in early on pilot schemes and CPD training will give your civils team a real head start as this tech continues to mature.
Context: Why 3D-Printed Substation Foundations Matter in the UK
We’ve got a lot going on in the UK’s grid reinforcement programme – hundreds of new and upgraded substations are needed to connect renewable power, support electrification, and strengthen the transmission network, all between now and 2035. Meanwhile, civils teams are up against it with constrained budgets, supply chain pressures on cement and rebar, and, of course, well-documented skills shortages. Foundations take the weight of a structure and distribute the load evenly across the ground – and if you cut corners, you risk disaster. The question is, can we find a smarter way to build the foundation?
National Grid, working with Hyperion Robotics and the University of Sheffield, managed to get the country’s first validated 3D-printed concrete substation foundations live in the field in 2025-2026. They combined off-site 3D printing in Finland with full-scale structural load testing in Sheffield, followed by on-site verification at a live substation site. That’s 54 individual printed foundation units – manufactured, transported and tested.
Initially, the focus was on compressive strength, stiffness, dimensional tolerances and durability of printed foundation elements compared with traditional cast in site reinforced concrete. The results were pretty impressive – but this tech sits within a wider digitalisation trend in civil engineering, where BIM-integrated design, automated setting out, and robotic rebar tying are just a few of the tools being used on sites all over the country. This article’s going to keep things down to earth, though – what this means for foundation types, pouring concrete vs printing, specs and day-to-day site practice for civils teams.
From Traditional Concrete Foundations to 3D Printing
Think about a standard pad foundation in a typical 132 kV substation. You’d start by excavating the site, laying down a blinding layer, fixing a rebar cage, building the formwork, pouring concrete into the formwork, vibrating it to get rid of air pockets, finishing the surface and then just waiting for it to set. It’s reliable and well understood, but can be pretty labour-intensive. A 3D-printed equivalent changes the whole sequence – you can do without the formwork altogether and shift much of the work off-site or to a robotic process.
You’ve got your main foundation types: strip, pad, raft and pile. In the substations you’ll see in the UK, pad footings for steel structures, strip footings under load-bearing walls (strip foundations are used for load-bearing walls in most conventional building designs), concrete slab foundation bases for equipment, and pile foundations where the ground conditions are poor. Concrete’s a popular choice for foundations because it’s durable and versatile across all these foundation types.
The traditional process always runs like this: site prep involves clearing debris and levelling the ground, then you dig the foundation trench to the right depth and width. Put up the formwork to define the foundation’s shape and dimensions, lay steel reinforcement bars inside for extra strength, pour the concrete, vibrate to get rid of air pockets, achieve a smooth finish, and then let it set.3D concrete printing steps in to replace a lot of that. A gantry or robotic arm will squirt a custom-made concrete mix layer by layer to create the foundation shape without all the hassle of traditional formwork. The concrete mix used is specially designed to hold its shape well under the weight of all the extra layers on top, and to stay malleable enough that it can bond properly with the layers below. Reinforcement techniques are changing as well: instead of using traditional bar and mesh, some options now include printing ducts for post-tensioning in, or inserting vertical dowels into the gaps, or even hybrid approaches where you print one part and pour concrete into a cast for the other bit. This new level of design flexibility means you can create all sorts of intricate shapes and curves that would just be unaffordable with traditional methods.
How The Uk’s First 3D-Printed Substation Foundations Were Put Through Their Paces
The validation process kicked off in the lab in 2024 with some small scale pilot tests in a test yard, then graduated to full-size printed foundations that were monitored in real time on a live National Grid substation site in 2025-26. All in all, the whole process was pretty methodical and quite cautious.
UK civil engineers were instrumental in figuring out what to test. They needed to make sure that it could meet all the same standards as existing designs: ultimate strength, serviceability, how much it would settle, and all that sort of thing. Of course, this meant putting the printed foundations through a range of tests: compressive strength, how well the layers of concrete stuck together, how well they held up to being flexed like a wall, how they’d hold up to freezing and thawing, and how well they’d resist corrosive chemicals. That was all pretty grueling.
To top it off, the validation process also covered a comparison between factory-printed units that got hauled to the site and units that were printed on site within designated areas of the substation itself. This was all so that they could see how the two approaches stacked up in terms of logistics and quality control. And the results were really telling: smaller printed foundations ended up with an eight-fold safety margin above the test criteria, while the medium and large ones ended up with a bearing capacity roughly three times better than what they expected. On-site overturning tests passed with flying colours.
Once they’d got all the test results sorted, National Grid decided to roll it out on non-critical bits first – cable trench covers, auxiliary equipment plinths, and non-load bearing architectural screens – just to build up some operational confidence before tackling the really critical elements.
Technical Comparison: 3D-Printed vs Poured Concrete Foundations
Now the burning question is: does it actually perform better, worse, or just differently from what we’re used to doing? To be honest, that is “differently, with some clear advantages and a few things still to prove”.
Material behaviour: The concrete mix that gets printed is tweaked to be low-viscosity enough to pump through the robotic arm but still high enough in thixotropy that it stiffens up nice and quickly once it’s been squirted out. The mix also has some special admixtures that help it gain strength a lot faster. Of course, all of this depends on the project and what loads it’s going to be under – and the type of printed mix used will have to balance all that out. Many trials have been using super low-CO2 binders and even geopolymer as an alternative to regular cement to try and cut the carbon footprint.
Structural performance: Printed specimens get tested at 7 and 28 days to see how their compressive strength, tensile split strength, and flexural strength stack up. We know from the UK trials that in at least some cases, the stuff printed in this way can actually outdo what we’d normally use. But there’s a bit of a catch – because the concrete is made up of layers, it develops what’s called anisotropy – the strength depends on the direction you’re testing it in. So the bond strength between layers ends up being the real deciding factor when it comes to structural performance.
Durability: Moisture creeping into the gaps between the layers, freezing and thawing, and the like – all those things are a major concern for printed concrete, particularly in the UK’s climate. You have to class the exposure and make sure you’re using the right type of mix – XC, XD, XF, you know the drill. To be honest, it’s still a bit early days for getting really solid data on this sort of thing.
Quality control and tolerances: Because the robotic arm and digital models do so much of the heavy lifting, setting out issues and rework are way down. And because you can control the digital models so tightly, the dimensions turn out tighter than you’d ever get from site-cast concrete – which means it’s way easier to get the switches and steelwork all properly aligned.
Constructability: And by doing away with all the formwork and shuttering, you end up having to rethink how the site is run. Fewer manual handling operations, less people working at height, and less temporary works all add up to a safer job. And that in turn means the whole groundworks and temporary works processes get overhauled – the ground still needs to be right, but once that’s done the rest of it just gets a lot easier.
Cost, Programme, And Carbon: What 3D-Printed Foundations Could Change
It’s still early days yet, but the early pilots are certainly suggesting some real savings to be had. National Grid’s own trial reported that the printed foundations used something like 56% less concrete than the traditional ones, which would cut the embodied carbon by about 65%. If that gets rolled out across all their substations, it’s looking like we could save around 705 tons of concrete, and around 323 tons of CO2 in the next decade alone – which would work out to about 1.7 million pounds in savings for the consumer.Programme Gains – A Real Game Changer
Once a 3D printer’s all fired up and rolling, foundation production can happen much faster than the traditional methods, and by a fair bit – we’re talking 50% fewer hours on site, and 80% less soil being moved around. For bigger projects where you’ve got loads of identical sub stations to build along a transmission line, this speed advantage really starts to add up, making 3D printing a cost effective way to go – especially for sites where you’re laying down multiple similar foundations.
When it comes to working out operational costs for contractors, it’s all about weighing up the price of the printer or hire fees against the savings on labour and formwork materials. Clients on the other hand really value the fact that 3D printing means fewer trucks on the road, less noise on site and better safety records thanks to less manual handling.
Foundation Types – Where 3D Printing Fits In
Foundations can be broadly split into shallow ones or deep ones. In the UK, the main types used in energy infrastructure are shallow pads, strip footings and raft foundations – which are like giant slabs that spread the load across the whole footprint of the building. Then you’ve got deep foundations that push loads right down to the bedrock, and pile foundations used in places where the soil’s too weak to support multi story buildings. Other types include crawl space foundations that keep buildings off the ground, full-depth basement foundations, and T-shaped foundations for areas where frost is a concern.
Costs of course vary – slab on grade foundations are $4 to $14 per square foot, crawl space ones range from $7 to $16 per square foot, basement foundations can be $10 to $40 per square foot, pile foundations average $1,500 to $3,000 per pile, T-shaped foundations cost between $10 to $20 per square foot and mat foundations can run from $10 to $20 or more per square foot.
For the next little while at least, 3D printed foundations are best suited to shallow foundations, less heavily loaded bits and pieces, repetition-heavy details and architectural walls or screens rather than transformer bases or complex structures that need deeper foundations. Specific substation examples include bases for cable sealing ends, inverter skids on solar-grid connection sites or precast-printed hybrid trenches where the printed top bit is concrete and the base is cast conventionally. Printed elements can also work with piles – like a printed pile cap sitting on a conventional CFA pile.
Not every site will be a good fit for 3D printing though. Sites that are really tight, or have super soft ground that’s prone to shifting, or are home to structures that are real sensitive to movement might still be better off sticking with traditional methods.
Navigating UK Foundation Regulations and Standards with New Tech
Just because the printing process is new doesnt mean the foundations dont still have to meet all the usual rules and regulations. Safety margins stay the same, you still have to make sure the foundations are structurally sound and durable.
In the UK, key standards include Building Regulations Part A for structural safety, the Eurocode suite ( EN 1990, 1992 and 1997, plus the National Annexes and the National Grids own tech specs. The British Standards Institution lays down the line on foundation regulations and building regulations make sure foundations are up to the job and can withstand uneven settling, water and pests. And as for testing of printed elements – its pretty much the same as for conventional reinforced concrete.
The approvals process for utility clients involves type testing of printed elements, third party certification and getting in early with building control, warranty providers and insurers. Also, UK civil engineers need to document material performance, quality control procedures and inspection regimes clearly in design risk assessments and method statements whenever they’re proposing 3D-printed foundations on any construction project.
Practical Step-by-Step Process: From Design to Installed 3D-Printed Foundation
Here’s a step by step guide on how to do a 3D-printed substation foundation, from concept to commissioning.
Stage 1 – Concept and Feasibility: Figure out which foundations would be good candidates for printing, considering geometry, loading, soil conditions and repeatability across the project. Not everything needs printing – focus on where 3D printing can add real value to your project.
Stage 2 – Geotechnical and Earthworks Interface: Get a soil survey done to figure out how strong the ground is, and whether any ground improvement or pile foundations are needed. The same rules apply as traditional foundations – bearing capacity, settlement predictions and platform design all have to be taken into account.
Where the soil’s a bit weak, or too sensitive to movement, you might still need to use traditional methods – ground improvement or piles, for instance.Stage 3 – Digital Design: Take the foundation and reinforcement strategy and turn it into a 3D model, and then convert it into a format the printer can use – all lined up with the same BIM models that the rest of your design team is working with. This is the point where the building design and the foundation design both get merged with digital fabrication.
Stage 4 – Material Selection: Figure out what kind of concrete will print best and hold up over time, including how you mix it with admixtures or add in fibres to get the right balance of printability & long-term durability for the real world.
Stage 5 – Trial Prints & Calibration: Any new construction project should include testing elements to tweak those print settings, like layer height and speed, and the mix parameters before you start printing actual foundations. It’s way easier to deal with problems then rather than after you’ve already put them on the site.
Stage 6 – Site Preparation & Groundworks: Civil engineers still do all the excavation, blinding, drainage, ducts and tolerance checks on the formation level. Building a solid foundation, whether it’s printed or poured, needs proper ground preparation.
Stage 7 – Printing & Supplementary Pouring Concrete: On-site printing brings in inserts and anchor bolts as you go, and if you need to follow up with some poured concrete, that gets used to create composite elements for when you need extra structural performance.
Stage 8 – Curing, Protection & Inspection: Foundations need a solid 7 days of curing to get to their full strength – and covering them in plastic sheeting really helps with that. In extreme weather you need to adapt the site procedures for the special mix, just like with standard concrete. Keep thorough records of how things went.
Stage 9 – Handover & Monitoring: For the next few years, early projects are going to have some enhanced monitoring – crack tracking, settlement surveys, and strain gauges to build a library of performance data for future designs and keep everyone in the regulatory loop.
What This Means for UK Civil Engineers and Groundworks Contractors
Let’s be honest with this: over the next 5-10 years, your work is going to change a bit. Not overnight, and there’s not going to be a single moment where your old knowledge is outdated – but it’ll still change. After all, concrete foundations can last for years with the right care – and regular inspections for cracks can sort out any issues before they become real problems. Whether your foundation was made with traditional or 3D printing methods, maintenance needs to keep being a priority.
UK Civil Engineers are going to need to know about both old & new ways of doing foundations, advising when 3D printing is a good move and when it’s not. Your role is going to evolve: more digital, less manual shuttering, and more working in partnership with 3D printing experts. And that’s a pretty cool kind of professional development, if you ask me.
For groundworks & civils SMEs there’s real opportunities waiting: you could team up with the printers, offer hybrid solutions, and stand out when it comes to bidding for those substation & renewable packages. Contractors who can smoothly bridge the two worlds are going to be ahead of the game.
Looking Ahead: From Substation Pilots to Large-Scale Infrastructure Adoption
If pilots keep performing well through 2027 and beyond, 3D-printed concrete foundations could well become the norm in specific infrastructure areas. The drivers for adoption – carbon targets, skills shortages, construction pressure – aren’t going away anytime soon.
Lessons from substation pilots could carry over to other big infrastructure projects: renewable power upgrades, battery storage facilities, onshore wind farms, solar parks and even major roads. Plus, more integration is on the way – AI-optimised designs, on-site renewable power for the printers, and robots that check the foundation for any cracks.
Treat 3D printing the same way you treat any other tool in your toolbox – it’s not a replacement for all reinforced concrete work. The fundamentals remain the same: you still need to do a solid job of ground investigation, detailing & site management. It’s just new ways to deliver safe & durable foundations.
Frequently Asked QuestionsAre 3D-printed concrete foundations allowed under current UK building regulations?
The short answer is – no rules against them. You just need to prove that your printed foundations will match or beat the performance in the building regulations, and that usually involves some serious testing, independent certification and getting in early with building control & the client’s technical experts.
Do 3D-printed foundations eliminate the need for reinforcement?
Most current 3d printed foundations are still all about the reinforcement – conventional bars, fibres, post-tensioning – even for substation and infrastructure loads. That is, unless you’re dealing with something as mundane as a cable trench cover, where a lightly loaded non-structural item can get by with just printed concrete. Still, when it comes to the critical stuff – the structural elements that actually hold everything together – you can bet your bottom dollar they’re going to need a proper reinforcement strategy to keep them stable under load.
How does 3D printing actually affect foundation inspection and maintenance?
From the outside, the inspection process isn’t all that different. Engineers are still looking out for cracks, movement, and water seeping in at joints and interfaces – regardless of whether the foundation was printed or poured into place. Early 3d printed installations might come with a few extra monitoring tools – we’re talking sensors, or more frequent site visits – so the owner can see how it’s all performing over time and use that information to tweak their design for future projects.
Is 3d printed concrete really suitable for every UK soil and weather condition?
Look, the geotechnical principles behind this stuff haven’t changed one jot. If you’ve got poor ground, well, you’ll still need to sort that out with pile foundations or ground improvement – the printed element will just sit on top as a structural cap or beam. Same old, same old. And when it comes to the UK weather – low temps, wind, rain – you’ll still need to adapt your print mixes and site procedures to get the job done. Soil movement and all that malarkey still require the same level of engineering nous as always.
What sort of training will site teams need to get up to speed with 3d printed foundations?
Well, you’ll need plant operators and site engineers to be comfortable with the printer controls – getting the thing calibrated, troubleshooting when it all goes wrong. And then you’ve got the supervisors and quality managers who need to understand the new testing and acceptance criteria. And really, what it boils down to is that UK civil engineers need to get upskilled with some CPD, grab some training from the manufacturers, and maybe even join in on some early pilot projects to get some real world experience before it becomes standard practice on every site.
From Tech to Reality on Site: The Role of Specialist Contractors
The arrival of 3D printed substation foundations marks a proper game-changer for UK civil engineering – but let’s be honest, any innovation only really pays off when it actually gets turned into real, safe, & proper jobs on site. That’s where specialist contractors step in and make a real difference. MAC Group Ltd, the UK Civil Engineering specialists have built a name for themselves by making sure that the fancy new tech is properly integrated into the day-to-day of their groundworks and civil engineering services. With a sharp focus on bulk earthworks, deep drainage, adoptable highways & getting those precision foundations just right, they work out of a base in central Lincolnshire & serve clients all over the country. Just like the pioneering work being done by National Grid & their partners, MAC Group Ltd brings together technical know-how with super-tight safety standards, and all the right accreditations ( CHAS Premium Plus, Constructionline Gold – you name it) & a really collaborative approach that says “yes we can”.