Our System & Specification
Every installation is built with strength and longevity at its core.
Typical specification includes:
- 4” to 6” deep steel frame (depending on load requirements)
- Joist centres at 400mm to 600mm
- 1.2m structural fixings/screw system for maximum rigidity
- Fully galvanised steel construction
- Installed onto appropriate ground supports or piles
- Custom layout based on your project
This results in a structure that is far stronger than standard timber decking frames and significantly exceeds typical deck build requirements.
Pricing
- £180 per m² (Supply & Fit Only) * subject to survey
- Minimum project value: £1,800
This includes:
- Materials
- Ground preparation (where required)
- Full installation
- Structural setup and levelling
No supply-only — we install every system ourselves to ensure it’s done properly.
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Faster, Cleaner Installation
Precision components allow for a more efficient install process with consistent results across the entire structure.
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Future-Proofed Design
The open structural design allows for easy integration of:
- Lighting
- Drainage
- Services
Without weakening the frame.
Why Choose The Diggerman?
- Specialists in groundwork and structural installs
- Supply & fit only — no corners cut
- Heavy-duty builds designed for real-world use
- Honest pricing with clear minimums
- Built once, built properly
We don’t install decking frames that need replacing in a few years — we build structures that last.
Ideal For
This system is perfect if you:
- Want a premium alternative to timber frames
- Are installing composite or porcelain decking
- Need to support heavy loads like hot tubs
- Are preparing for future structures (e.g. glass rooms)
- Want peace of mind the job is done right
Get a Quote
Every project is bespoke.
Get in touch today to discuss your project and receive a fixed price based on your requirements.
Sub Base Frequently Asked Questions
Do you offer a free survey and quotation?
Yes — we provide a free site survey and no-obligation quotation.
We’ll visit your property, assess the ground conditions, discuss your plans, and recommend the most suitable specification for your project.
Do you supply the frame only?
No. We operate on a supply and fit only basis.
This ensures every structure is installed correctly, to our standards, and built to last.
How is pricing calculated?
Our pricing starts from £180 per m², with a minimum project value of £1,800.
Final costs depend on factors such as:
- Ground conditions
- Access
- Size and layout
- Load requirements (e.g. hot tubs or structures)
What depth frame will I need?
We typically install 4” to 6” deep steel frames, depending on the intended use.
Heavier loads such as hot tubs or glass extensions will require a deeper, reinforced structure.
What joist spacing do you use?
We install joists at 400mm to 600mm centres, significantly stronger than many standard decking builds.
This provides a solid, long-lasting base for all types of decking finishes.
What makes your system different from timber decking frames?
Our steel systems are:
- Stronger and more rigid
- Resistant to rot, warping, and movement
- Built to exceed standard decking specifications
- Designed for long-term performance with minimal maintenance
Can your frames support heavy loads like hot tubs?
Yes. Our systems are designed to handle high load requirements, including hot tubs and future structures, provided this is specified at the design stage.
How long does installation take?
Most projects are completed much faster than traditional timber builds, thanks to the engineered system.
We’ll give you a clear timeframe during your quotation.
Most projects are completed much faster than traditional timber builds, thanks to the engineered system. We’ll give you a clear timeframe during your quotation.
Yes — we can handle ground preparation, levelling, and support installation as part of the full service, ensuring the structure is installed on a solid base.
Can you install the decking as well?
Our core service is the structural subframe installation, but we can discuss finishing options depending on your project.
Where do you cover?
We cover a wide local area. Contact us to confirm availability in your location and arrange your free survey.
