74Mtr Square Prefabricated 20 40Ft Folding Container House Expandable Granny Flat With Off Grid Solar Panel System Bruny Island

Product Description

Expandable House Exterior
Expandable House Overview
Technical Specifications
Option sizeSmall 20ft, 20ft, 30ft, 40ft, etc. Special size available for 2.9M height.
Main materialGalvanized steel structure with sandwich panel wall and doors, windows, etc.
Weight3200 kgs
Service life30-40 years
ColorWhite, blue, green, brown, or customized
Steel structure3mm Hot galvanized steel structure with 4 corner casts; 18mm fiber cement board; 1.6mm PVC flooring; 50mm rock wool, eps or PU sandwich panel; Galvanized steel base plate.
Wall50/75/100mm EPS/Rock wool/PU Sandwich Panel
Roof3-4mm Hot galvanized steel structure with Galvanized steel roof covering and 50mm-70mm sandwich panel.
DoorSteel/aluminum frame (W870*H2040mm) with handle lock or sliding glass door (W1500*2000mm).
WindowPVC/aluminum frame (W800*H1100mm) with double glass (5/8/5mm).
Electricity3C/CE/CL/SAA Standard, with distribution box, lights, switch, sockets, etc.
AdvantagesFast installation (2 hours/set), Anti-rust, Waterproof, Fireproof (Grade A), Wind-resistant (Level 11), Anti-seismic (Grade 9).
Structural Strength
🚀 Our house weighs more than 3 tons while others weight only 1.5 tons.
Full Customization Available
Interior Customization
Layout Customization
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Internal Flooring: Features a 20mm calcium silicate board and anti-corrosive multi-layer bamboo-wood composite board with waterproof coating.
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Wall Construction: 75mm EPS sandwich panels with lightweight steel frame for fire resistance, thermal insulation, and seismic safety.
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Advanced Sealing: We use polyurethane adhesive sealant instead of traditional oil-based sealants to ensure zero leakage.
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Glass & Windows: Aluminum alloy materials and double-layer insulated glass offer thermal efficiency and sound insulation.
Systems: Pre-installed plumbing and electrical systems compliant with international safety standards.
Interior & Exterior Gallery

70% of expandable houses sold in Australia and the United States come from our production facility. Our structures weigh twice as much as standard container houses on the market.

Production Advantage
Modern Living Solutions

✨ Smart Expandability: One-click expansion design allows for standard container size transport while doubling or tripling living space upon deployment.

🚀 Plug-and-Play: Pre-assembled and fully furnished. Simply level and connect utilities for move-in within 1-2 days.

🏗️ Durable & Secure: Constructed with high-quality weathering steel. Earthquake, wind, fire, and theft resistant with a service life exceeding 20 years.

🌿 Eco-Friendly: Modular design for repeated relocation and recyclable materials. Ideal for campsites, offices, and emergency housing.

Modular Design
Living Space Configuration

Prefabricated Options: 37m² or 74m² layouts available.

Open Plan Living: Includes a beautiful lounge and kitchen area with a full-size bathroom. The unit literally folds out into a home.

Insulation & Comfort: Galvanized steel framing with 75mm EPS panels keeps the interior cool in summer and warm in winter. Compliant with international design certificates.

Standard Inclusions List
✅ 3.6m Kitchen with cupboards, stone bench tops, and stainless-steel sink.
✅ 18mm Marine plywood base floor with quality PVC coverings.
✅ SAA Approved wiring, power points, light switches, and fittings.
✅ Full Bathroom: Vanity, mirror cabinet, 900x900mm shower cubical, and toilet.
✅ 9 Double-glazed aluminum sliding windows with fly screens.
✅ 10-Year structural warranty on galvanized steel framing.
Interior Details
Frequently Asked Questions
How long does it take to expand and how many people are needed?
It is very quick! 4-6 people can complete the expansion in approximately 10-15 minutes.
Is the structure watertight and draft-proof?
Yes. We use a multi-layer sealing design including high-performance sealing strips, waterproof rain curtains, and drainage channels, all rigorously tested for airtightness.
Can it be used in extremely cold or hot regions?
Absolutely. The 75mm polyurethane insulation layer outperforms traditional brick walls. With standard HVAC systems, it remains comfortable in most global climates.
How stable is the house during strong winds?
The house is extremely stable. The expansion section is securely locked to the main steel frame using multiple mechanical locking devices, professionally tested for high wind resistance.
Can the house be relocated multiple times?
Yes. The house can be retracted back into its container form and loaded onto a truck. It is designed to be disassembled and reassembled an unlimited number of times.
Is this an environmentally friendly building solution?
Yes, it uses recyclable steel, minimizes on-site construction waste through factory prefabrication, and features high thermal efficiency to reduce energy consumption.

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