Built for More Than Just Decking
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 Detail
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.
Please check out our price indication calculator below.
05
Faster, Cleaner Installation
Precision components allow for a more efficient install process with consistent results across the entire structure.
- Site clearance
- Ground levelling
- Installing supports or piles
- Setting accurate levels
- Full base installation ready for the next stage
This ensures your base is ready for immediate use by you or your chosen contractor.
06
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 install bases for garden buildings as well as decking?
Yes — while we do install steel sub-frame systems for decking, a large part of our work is creating strong, level bases for garden buildings. This includes garden rooms, home offices, workshops, sheds, summer houses and more.
What types of garden buildings can your base systems support?
Our steel base systems are suitable for a wide range of outdoor structures, including:
- Home offices and workspaces
- Beauty salons and treatment rooms
- Man caves and hobby rooms
- Summer houses
- Garden sheds and storage units
- Workshops
- Home gyms
- Guest accommodation
- Hot tub bases
- Pergolas
Each base is designed based on the intended use, size and weight of the structure.
Are your bases only for decking projects?
No — decking is just one application. Our systems are designed to support a wide range of outdoor builds, particularly garden buildings where a solid, long-lasting base is essential.
Do you carry out ground preparation as part of the installation?
Yes — we can handle the full groundwork required, including levelling, preparation and installing the correct supports to ensure a stable and durable base.
Can your systems support heavy structures like hot tubs or insulated garden rooms?
Yes — all installations are specified based on load requirements.
Whether it’s a hot tub, fully insulated garden room or workshop, the structure is designed to provide the necessary strength and stability.
What makes your system better than a traditional timber base?
Our steel sub-frame systems offer:
Greater strength and load capacity
Long-term durability
Resistance to rot, warping and movement
A more precise and level finish
Reduced maintenance over time
This makes them ideal for higher-value garden buildings and premium outdoor spaces.
Do you cover my area?
We regularly install bases in:
- Warwickshire
- Stratford-upon-Avon
- Warwick
- Leamington Spa
- Rugby
- Redditch
- Coventry
- Southam
- Banbury
- The Cotswolds and surrounding areas
If you’re nearby but not listed, just contact us — we may still be able to help.
Can you work with other contractors or garden room suppliers?
Yes — we regularly work alongside garden building suppliers, landscapers and other trades to ensure the base is installed correctly and ready for the next stage of the project.
How do I get a quote for a garden building or decking base?
Simply get in touch with details of your project, including size, intended use and location. We can then provide guidance and a tailored quote based on your requirements.
What is a steel sub-frame base system?
A steel sub-frame base system is a structural framework made from galvanised steel that creates a strong, level platform for decking, garden buildings and other outdoor structures. It replaces traditional timber frames with a more durable and stable solution.
Why choose steel instead of a timber base?
Steel offers significantly better durability and performance compared to timber. It won’t rot, warp or shrink over time, and provides a stronger, more stable base — particularly important for garden buildings and heavier installations.
Do you carry out ground preparation as part of the installation?
Yes — we can handle the full groundwork required, including site clearance, levelling and installing the correct supports to ensure a stable and durable base.
What ground types can you install on?
Our systems can be installed on a variety of ground conditions, including soil, uneven terrain and prepared surfaces. Each installation is assessed to determine the most suitable support method.
How is the base supported?
The base is typically supported using appropriate ground supports or piles, depending on the site conditions. This ensures stability, correct load distribution and long-term performance.
What spacing do you use for the frame?
Joist centres are typically set between 400mm and 600mm, depending on the requirements of the project and the load being supported.
Can your systems support heavy structures like hot tubs or insulated garden rooms?
Yes — all installations are specified based on load requirements. Whether it’s a hot tub, fully insulated garden room or workshop, the system is designed to provide the necessary strength and stability.
What makes your system better than a traditional timber base?
Our steel sub-frame systems offer:
- Greater strength and load capacity
- Long-term durability
- Resistance to rot, warping and movement
- A more precise and level finish
- Reduced maintenance over time
This makes them ideal for higher-value garden buildings and premium outdoor spaces.
Do you only install the frame, or can you complete the full project?
We specialise in the base and groundwork side of the project. However, we can work alongside your chosen contractor or garden building supplier to ensure everything is ready for the next stage.
