24hrs
Shell up in a single day
No weeks of bricklaying. The home stays weather-tight almost immediately — ideal for occupied homes, with minimal disruption to family life. Complete in around 7 days.
#1 reason homeowners choose us
System 7 · Now recruiting UK installers
Months of building. Done in days.
Superstrux™ System 7 is the precision-engineered steel shell for house extensions — erected in 24 hours, finished in around 7 days, and up to 40% cheaper than a traditional build.
40%Cost savings
3×Faster build
24hrsTo erect shell
100%Recyclable
Scroll to build
Why System 7
Traditional extensions lose weeks to weather, wet trades and waiting. System 7 deletes all three.
Superstrux™ System 7 is a next-generation method for building house extensions and garden rooms. Every frame is fabricated to millimetre accuracy from your architect's drawings, delivered as pre-built steel cassettes, and erected on site in as little as 24 hours.
No mortar curing. No scaffold marathons. No weather delays. Just a precision shell that's watertight in a day and finished — brick, render, timber or cladding — in about a week.
For your business that means faster handovers, predictable margins and more jobs through the book every year. Install it for your existing customers or grow with it — registered installers unlock trade pricing and instant quoting tools.
40%
Lower build cost vs traditional
24hrs
To a watertight shell
~7days
To a finished extension
Inside the shell
Engineered like a product.
Engineered like a product.
Built like a house.
System 7 replaces wet, weather-dependent masonry with a factory-precise steel structure — without ever looking modular once finished.
SYS.7 — Wall build-up
01
Precision steel frame
High-strength, millimetre-accurate and lightweight. Spans wide openings for bi-folds and sliders without bulky supports — and often avoids costly foundation upgrades.
02
High-performance insulation
Designed to exceed Building Regulations with airtight construction and excellent thermal performance. Lower heating bills, year-round comfort.
03
Weatherproof membranes
Air and vapour barriers plus breather membrane seal the shell — watertight in 24 hours, whatever the UK weather is doing.
04
Any finish you like
Brick slips, render, timber or cladding. Flat or pitched roofs. The finished extension matches the house — it never looks modular.
The 7-day build
One week.
One week.
Start to handover.
While a traditional build is still waiting on brick deliveries, a System 7 crew has already handed the keys back.
DAY 0
Delivered flat-packed
The engineered shell arrives on site, fabricated to your architect's drawings.
DAY 1
Shell up. Watertight.
Pre-built steel cassettes are bolted together, boarded and wrapped — watertight in as little as 24 hours.
DAYS 2–6
Finishes go on
Glazing, roofing and your chosen finish — brick, render, timber or cladding.
DAY 7
Handover
No drying-out period. Furniture in, kettle on — the space is ready to live in.
Why choose Superstrux™
Every advantage.
Every advantage.
Engineered in.
A high-performance extension installed in days, not months — saving money, reducing disruption and delivering precision-built results.
Cost certainty
Fixed pricing with fewer unknowns. Reduced labour, less delay risk, no lengthy scaffold hire — no budget creep.
Structural strength
The high-strength frame spans wider openings without bulky supports. Perfect for big bi-folds, sliders and open-plan living.
Finished System 7 interior
Factory precision
Millimetre-accurate fabrication delivers better fit, better finish and faster snag-free completion.
All-weather build
No waiting for mortar to cure, less downtime from rain or cold. Built year-round — ideal for the UK climate.
Energy performance
Exceeds Building Regulations with excellent insulation, airtight construction and lower heating bills.
Lightweight & versatile
Lighter than masonry — often avoids costly foundation upgrades. Suits tight access, rear gardens and urban sites.
Sustainable choice
100% recyclable, less site waste and lower embodied carbon than masonry. A Modern Method of Construction.
Design flexibility
Brick, render, timber or cladding. Flat or pitched roofs. Matches existing aesthetics — never looks modular.
Planning friendly
Fully Building Control compliant with structural calculations included. Mortgage and insurance friendly.
Compare methods
Superstrux™ vs traditional build
Same architect's drawings. Same Building Regs. Wildly different timelines.
Superstrux™ System 7
~7 days
Traditional build
10–12 weeks
The Superstrux™ way
System 7
- Time to build 7 days
- Building Regs approved ✓
- Architect design ✓
- Weather delays None
£29,000
inc. VAT — average 6m × 3m
The old way
Traditional build
- Time to build 10–12 weeks
- Building Regs approved ✓
- Architect design ✓
- Weather delays Strong possibility*
£45,000
inc. VAT — average 6m × 3m
*Most traditional builds are affected by rain and wind, causing major delays. Superstrux™ System 7 can be built year-round with little to no constraints.
What you hand over
Spaces built on System 7
For builders & trades
Finish in days.
Finish in days.
Fit more jobs into every year.
Faster handovers, fixed pricing and precision components mean happier customers and a fuller order book. Register as a Superstrux™ installer to unlock trade pricing.
Become an Installer →
Get certified
Become a Superstrux™ installer
Register now to unlock massive trade savings. Here's how it works:
Apply in two minutes
Tell us who you are, where you work and what you build. No obligation.
Unlock trade pricing
Approved installers get access to trade prices and the quoting tools.
Quote & build
Use the configurator to generate instant quotes with your trade discount.
Also from Superstrux™
Garden rooms.
Garden rooms.
Same system. Same speed.
The same System 7 shell builds freestanding garden rooms — a garden office, studio or gym, watertight in 24 hours and complete in around 7 days. Fixed prices, instant online quotes.
Explore Garden Rooms →
Questions
Everything installers ask us
How much cheaper is Superstrux™ compared to a traditional build?
Superstrux™ System 7 reduces material and labour costs by up to 40% compared
to traditional masonry builds. A 6m x 3m extension starts from £29,000
including VAT versus approximately £45,000 for a traditional equivalent.
How long does a Superstrux™ extension take to build?
The Superstrux™ shell is erected in as little as 24 hours and a complete
extension is typically finished in around 7 days — compared to 10–16 weeks
for a traditional build.
Is Superstrux™ System 7 Building Regulations compliant?
Yes. Superstrux™ System 7 is fully Building Control compliant with structural
calculations included. It is also mortgage and insurance friendly.
What finishes are available with Superstrux™?
Superstrux™ extensions can be finished with brick, render, timber, or cladding.
Flat and pitched roofs are both available. The finished result does not look
modular.