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Ground Screw Pull Testing & Load Testing

On-site testing that tells you exactly what your ground screws can hold — before you build on them.

Verified, Not Estimated

What Is Ground Screw Pull Testing?

Every site is different. Soil type, moisture content, depth of bearing layer — they all affect what a ground screw can actually carry. A pull test measures the real load capacity at your specific location, rather than relying on a general specification estimate.

We carry a portable load testing kit capable of applying up to 60kN — around 6 tonnes — of vertical force. The test takes under 10 minutes per screw and produces hard data that you can pass directly to your structural engineer or use for building control sign-off.

Tests pull-out resistance and compressive load capacity
Results on-site in under 10 minutes per screw
Suitable for 1m, 1.25m, 1.5m and 2m screws
Data provided in a format suitable for your structural engineer
Enquire About Load Testing
Ground screw installation and testing equipment set up on a garden lawn, ready for load test
When It's Needed

Who Needs a Pull Test?

Load testing isn't required on every project — but for certain situations it's essential, and for others it just gives you the confidence to proceed.

Larger Garden Rooms & Structures

Bigger structures put more load on each foundation point. A pull test confirms your ground screws have the capacity to match the design load.

Projects Requiring Structural Sign-Off

If your project needs approval from a structural engineer or building control, verified load data is what they need. General spec sheets won't always cut it.

Uncertain Ground Conditions

Soft ground, filled land, sloped sites or unusual soil profiles. Testing removes the guesswork and gives you confidence in the foundation before you build.

Commercial & Multi-Unit Projects

Any commercial installation or multi-unit development where risk needs to be managed precisely and documentation is required.

Don't need a load test? For most standard garden room projects on normal ground, a pull test isn't necessary — our 1.25m screws are a proven specification. If you're unsure, just ask us and we'll tell you honestly whether testing is worth it for your project.
The Test

What Gets Measured

Tensile / Pull-Out Resistance

The upward force required before the screw begins to move. Critical for structures exposed to wind uplift, or where the building's frame creates uplift loads on the foundation.

Compressive Load Capacity

How much downward load the installed screw can carry before deformation. The primary figure for vertical load-bearing foundations — what most structural engineers will ask for.

Lateral Stability (if required)

Horizontal resistance can be assessed where wind or lateral loads are a specific concern for the structure. Not always required but available on request.

Maximum Test Capacity

Our equipment can apply up to 60kN (approximately 6 tonnes) of vertical tensile load — comfortably covering the safe working load requirements for garden rooms, larger structures and most commercial applications.

How We Can Help

Our Load Testing Service Options

We offer testing as a standalone service or combined with installation.

Most Popular

Testing + Full Installation

We install a test screw first, run the load test and confirm the capacity is right for your project — then proceed with the full installation on the same visit. The most efficient option if you're going ahead with us for the foundations.

Load tested before full installation begins
Everything done in one visit
Data provided alongside completed foundations
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Pre-Project

Testing Only

Need load data before committing to a full installation? We'll come to site, install a test screw, run the test and provide the figures. Useful if you need data for a structural engineer before making foundation decisions.

Site-specific load data
No commitment to full installation required
Pricing on application
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Simple & Fast

How the Test Works

The whole process is quick, on-site and doesn't require any specialist preparation from you.

1
Test Screw Installed

A ground screw is driven to the required depth at a representative location on your site using our specialist equipment.

2
Load Applied

Our calibrated testing kit applies measured increments of force — recording movement and resistance at each stage.

3
Results Recorded

Safe working load figures are produced from the measured data. The test is completed in under 10 minutes per screw.

4
Data Provided

You receive verified load capacity data — ready to pass to your structural engineer, building control or for your own records.

Close-up of ground screw installation machine driving a screw into gravel Large field project with ground screws installed across a wide open site Ground Down installer in hi-vis working with installation equipment
Need Load Testing?

Get in Touch to Discuss Your Project

Tell us what you're building, your location and why you need a pull test. We'll come back with options and pricing.

Send an Enquiry Call 07840 092397

Or see our main supply and installation service for standard garden room foundations.