Steel Frame Garden Room Structures
Pre-Engineered Light Gauge Steel Frames — From £2,365
Pre-engineered galvanised steel frames for garden rooms, home offices, studios and extensions. Factory-cut, pre-drilled and ready to erect — with ground screw foundations, EPDM roofing and composite cladding available as a complete system.
Bespoke Steel Frame Garden Room Systems
Whether you need additional space for working, relaxing, entertaining or creating a dedicated home studio, Forti Nova supplies bespoke light gauge steel frame (LGSF) garden room systems designed around your project requirements. Combining modern aesthetics with precision-engineered steel framing, our garden room structures are designed to integrate seamlessly into a wide range of outdoor spaces while adding practical long-term value to your property.
Forti Nova works directly with homeowners, developers, installers and trade professionals across the UK, supplying complete steel frame garden room systems alongside waterproofing, roofing and external finishing solutions from one specialist supplier.
Classic Garden Rooms
Our standard garden room range offers a selection of popular layouts and sizes designed to suit many common applications. These systems are developed to simplify installation while maintaining a clean modern finish and excellent structural performance. Standard configuration availability and delivery timing are confirmed from Blackburn for each quotation.
Bespoke Garden Rooms
For projects requiring something more tailored, Forti Nova can supply bespoke steel frame garden room solutions designed around your exact requirements. Existing layouts can be adapted or entirely custom structures developed to suit your intended use, dimensions and finishes. Contact us to discuss your specification.
Single Storey Extensions & Garden Buildings
Our steel frame systems are engineered for strength, accuracy and long-term durability. Every project is designed to meet relevant structural requirements, making them suitable for a wide range of residential and commercial applications including:
What Is a Steel Frame Garden Room Structure?
A steel frame garden room uses light gauge steel framing (LGSF) — a modern construction system where cold-formed galvanised steel sections form the structural skeleton of the building. These sections are precision manufactured off-site and delivered ready for assembly, allowing faster and more accurate construction than traditional timber framing.
Each frame is factory-cut to the project specification, with members and connection points prepared for efficient site assembly. Final tolerances, site adjustments and installation sequence depend on the approved drawings, substrate, foundations and actual site conditions.
Steel frame structures are widely used in modern modular construction because they provide high structural strength, dimensional accuracy, rapid assembly and long-term durability. Because steel does not warp, rot or attract pests, it offers a reliable alternative to timber framing — and a structure designed to perform reliably for decades.
Forti Nova supplies pre-engineered light-gauge steel-frame garden-room systems from Blackburn, with standard configuration availability and nationwide delivery timing confirmed per quotation.
Galvanised steel
Galvanised light gauge steel avoids timber rot and pest attack. Final durability and maintenance expectations depend on the specified coating, environment and project detailing.
Efficient Site Assembly
Factory preparation can reduce on-site cutting and measuring. The frame still needs to be checked and erected to the approved drawings and actual site conditions.
Project Engineering Route
Structural calculations and design information can be supplied where included in the project scope. Building Control and certification requirements are confirmed for the specific project.
One supplier for everything
Ground screws, frames, roofing, insulation, cladding — all from our Blackburn depot. One invoice. One point of contact.
Supplied from Blackburn
Standard configurations are quoted with current availability, package dimensions and delivery timing confirmed per order.
Supply or contractor route
Order the agreed system scope or discuss a trained approved-contractor route for foundations, assembly, roofing and finishes.
Steel Frame Garden Room Structures — Standard Sizes
Review the standard configurations and published starting prices, then request a current quotation covering specification, VAT, availability and delivery.
Steel Frame 3 × 3m
Check Availability9m² floor area
Home office · reading room · small studio
£2,365 excl. VAT
View Details & Images →
Steel Frame 3 × 3.6m
Check Availability10.8m² floor area
Home office · hobby room
£2,398 excl. VAT
View Details & Images →
Steel Frame 3 × 4.2m
Check Availability12.6m² floor area
Garden room · art studio
£2,568 excl. VAT
View Details & Images →
Steel Frame 3.6 × 4.8m
Check Availability17.3m² floor area
Garden room · gym · therapy room
£2,900 excl. VAT
View Details & Images →
Steel Frame 4 × 4.8m
Check Availability19.2m² floor area
Large garden room · games room
£2,912 excl. VAT
View Details & Images →
Steel Frame 4 × 5.4m
Check Availability21.6m² floor area
Premium garden room · annex
£3,076 excl. VAT
View Details & Images →Need a size not listed? We work with custom specifications.
Call for Custom SizingKey Advantages
Benefits of Steel Frame Garden Rooms
Light gauge steel framing (LGSF) offers significant advantages over traditional construction methods — from lightweight engineering to complete sustainability.
Lightweight Construction
Light gauge steel framing can provide high strength relative to self-weight and is practical for prefabrication and handling. Foundation requirements still depend on the complete building loads, spans, ground conditions and structural design.
Strong & Durable
Steel framing delivers excellent long-term durability and dimensional stability. Galvanised steel sections provide a robust structure suitable for modern insulated building systems and demanding environments.
Sustainable Construction
Steel is fully recyclable and offers a more sustainable construction approach compared with many traditional alternatives. Steel frame systems also help reduce material waste and support energy-efficient build-ups.
Precision Engineered
Using advanced CAD-based design and precision manufacturing processes, steel frame systems are produced accurately and consistently to support efficient installation and reliable structural performance.
Efficient Installation
Prefabricated steel frame systems can reduce on-site cutting and measuring. Actual erection and weather-tight programme depends on project size, crew, access, foundations, roof and envelope scope.
Whole-System Cost
Compare the frame, engineering, foundations, assembly, roof, insulation, finishes, delivery and maintenance on the same complete scope.
Steel Frame vs Timber Frame Garden Rooms
The comparison is clear. Here's why thousands of UK garden room installers and homeowners are switching to light gauge steel.
| Feature | Steel Frame (Forti Nova) | Timber Frame |
|---|---|---|
| Dimensional accuracy | Factory-cut to ±1mm tolerance | Varies — natural defects |
| Rot resistance | ✅ Immune — galvanised steel | ❌ Susceptible |
| Pest resistance | ✅ Steel is pest-proof | ❌ Timber attracts pests |
| Fire resistance | ✅ Non-combustible | ❌ Combustible |
| Warping / movement | ✅ None — dimensionally stable | ❌ Seasonal movement common |
| Load capacity | ✅ Higher load ratings | Lower by comparison |
| On-site cutting required | ✅ No — all pre-cut | ❌ Yes — adds time and cost |
| Speed of assembly | ✅ Faster — all pre-drilled | Slower — more on-site labour |
| Durability | Galvanised steel; project-specific | Depends on timber grade, treatment and exposure |
| Consistency batch to batch | ✅ Identical every time | ❌ Varies by batch |
Complete Garden Room System
The Modern Garden Room Build System
Many modern garden room builds now follow a modular construction approach — combining five engineered systems for a faster, stronger, more consistent build. Forti Nova supplies them all.
Many Customers Combine These Systems
Most garden room builds combine ground screws, steel frame structures, EPDM roofing and composite cladding to create a complete modular building system. Forti Nova supplies all four from one depot.
Ground Screw Foundations
No-dig foundation systems for suitable sites, coordinated around the frame layout and project-specific load requirements.
Explore Ground Screw FoundationsSteel Frame Structure
Pre-engineered light gauge steel — galvanised, pre-cut and prepared for efficient site assembly. The structural skeleton the building is built around.
← You are hereEPDM Rubber Roofing
A durable sheet-membrane roofing route for suitable flat and low-slope roofs. FlexiProof EPDM can be coordinated with the frame, roof deck, drainage and detailing as part of the wider build.
Explore EPDM Roofing SystemsComposite Cladding
Modern, low-maintenance composite boards for the exterior. Weather resistant, colour stable and available in a range of finishes to suit any style.
Explore Composite CladdingPriviFilm Smart Glass
Switchable privacy film for garden offices, therapy rooms and studios. Instant clear-to-private at the touch of a button.
Explore PriviFilm Smart GlassOne supplier for the complete system. Ground screws, steel frame, EPDM roofing, composite cladding — all from our Blackburn depot. One order. One invoice. One point of contact.
Discuss Your Complete SystemComplete System Supply
Forti Nova can also support projects beyond the structural frame itself, supplying systems that integrate seamlessly with your steel frame garden room.
Ground Screws & Foundations
Hydraulic no-dig foundation solutions designed around your frame specification.
EPDM Roofing Systems
Market-leading flat roof membranes with exceptional weather resistance and longevity.
Liquid Waterproofing Systems
Spray-grade and brush-grade liquid rubber systems for complete weatherproofing.
Composite Cladding & External Finishes
Contemporary low-maintenance boards in a range of colours and textures.
Fascia, Soffit & Rainwater Products
Complete external finishing systems to protect and enhance your structure.
Insulation-Compatible Roofing Build-ups
Complete roofing systems designed for thermal performance and condensation control.
This allows homeowners, installers and developers to source multiple compatible systems through one supplier — simplifying logistics, reducing coordination issues and ensuring all components work together seamlessly.
Discuss Your Complete SystemStage 1 · Foundation System
Foundations for Steel Frame Garden Rooms
Every steel frame structure requires a stable foundation. Many modern garden room builders prefer ground screw foundations — installed hydraulically in hours, with no excavation, no concrete and no curing delays.
Ground screws create a level structural base capable of supporting modular buildings, and they're designed to coordinate precisely with your steel frame specification. Foundation and frame layouts can be coordinated around the same project information, reducing avoidable site coordination issues.
- No concrete curing stage
- Reduced excavation on suitable sites
- Can suit sloping sites with project-specific design
- Designed around your frame spec
- Potentially removable subject to site and structure
Materials & Finishes
Complete Your Garden Room Build
Once your steel frame is up, finish the build with the right roofing, cladding and glass systems — all available from Forti Nova.
EPDM Rubber Roofing
FlexiProof EPDM provides a sheet-membrane roofing route for suitable flat and low-slope roofs. The membrane, deck, adhesive, drainage and detailing should be specified together for the actual garden room build.
Explore EPDM Roofing Systems
Composite Cladding
Modern, low-maintenance composite boards for the exterior. Weather resistant, colour stable and available in a range of finishes to suit any garden room or extension.
Explore Composite Cladding Systems
PriviFilm Smart Glass
Switchable smart privacy film for garden offices, therapy rooms and studios. Instant clear-to-private at the touch of a button — the premium upgrade for high-end garden room projects.
Explore PriviFilm Smart FilmWhat Our Steel Frames Are Used For
Our steel frames suit a wide range of applications — from compact home offices to large leisure spaces.
Garden Home Offices
A common use for steel-frame garden rooms, creating a dedicated workspace separate from the main house. Planning, insulation, services and Building Regulations depend on the specific project.
Garden Gyms
Steel frames can be designed for the project loads associated with gym equipment. Final floor and frame capacity must be checked against the actual equipment and structural design.
Art & Music Studios
A dedicated creative space with controlled acoustics and temperature. Steel framing allows wide, clear spans without internal posts interrupting your layout.
Leisure & Cinema Rooms
Create a retreat separate from the house. Steel frames give you the confidence to hang heavy screens, projector equipment and speaker systems safely.
Therapy & Treatment Rooms
Compliant, professional-grade spaces for therapists, counsellors, beauticians and clinicians working from home.
Extensions & Outbuildings
Our frames aren't just for garden rooms — we supply steel structural frames for extensions, garages, annexes and commercial outbuildings.
How It Works
From first enquiry to finished structure — here's the simple process.
Enquire
Call or email us with your project details — size, use, location. We'll confirm stock and give you a full quote including delivery.
Frame Specified
We confirm your frame size, coordinate with ground screws if needed, and prepare your order with assembly drawings.
Delivery Confirmed
Package details, current availability, unloading requirements and delivery timing are confirmed in the accepted quotation.
Assembly Route Agreed
The customer or named approved contractor follows the accepted drawings and written responsibility schedule.
What Our Customers Say
Homeowners, contractors and installers across the UK.
"Ordered the 4×4.8m frame for a garden office. Delivered next day, everything pre-cut exactly as described. Our builder had it up in a day. Absolutely no issues — would order again."
James H.
Manchester
"The team at Forti Nova walked us through the whole spec — frame, ground screws, EPDM roof. One call, one order. The finished room is fantastic and the price was very competitive."
Sarah T.
Preston
"We've now used Forti Nova frames on three garden room projects. Consistent quality, fast delivery, and the BaseShield rodent barrier is a nice touch. Highly recommended to any installer."
R. Collins
Leeds
Download Information & Technical Support
If you would like to learn more about our steel frame garden room systems, installation methods or compatible waterproofing and external finishing options, contact Forti Nova for technical guidance, quotations and project support.
Supplying Steel Frame Garden Rooms Across the UK from Blackburn, Lancashire
Forti Nova is based at our purpose-built depot and showroom in Blackburn, BB1 3DL. We supply light gauge steel frame garden rooms to homeowners, contractors and developers nationwide — with approved-contractor routing available for suitable ground screw projects across the North West and beyond.
Our location at Bridgewater Business Park means we're easily accessible from the M65 motorway network, and UK delivery can be arranged, with availability, package size, unloading requirements and timing confirmed per quotation.
Whether you're in Manchester, Preston, Leeds, Liverpool, Sheffield, Birmingham or anywhere across England and Wales — your steel frame is a quick order away. Call us on 01254 433987 to discuss delivery and installation options for your area.
Visit Our Showroom
Unit 1–3 Bridgewater Business Park
Gladstone Street
Blackburn, BB1 3DL
Steel Frame Garden Room Structures Across the UK
Forti Nova supplies steel frame garden room structures to homeowners, builders and installers across the UK. Delivery from Blackburn is arranged against the frame size, project location and current transport availability.
Steel frame projects can also be coordinated with ground screw foundations and EPDM roofing systems, helping the foundation, frame and roof package follow one clearly defined project route.
Steel Frame Garden Room FAQs
Everything you need to know before buying a steel frame garden room from Forti Nova.
Steel Frame Garden Rooms by Location
Supply and installation of steel frame garden rooms across the North West. Click your location for local service and pricing.
Ready to Order Your Steel Frame Garden Room?
Standard configurations with ground screw, EPDM roofing and composite cladding options. Request a current complete-system quotation. Trade and public welcome.
Call 01254 433987 · Mon–Fri 7:30am–4:30pm · Sat 8am–12pm · Unit 1–3 Bridgewater Business Park, Blackburn BB1 3DL