Corten Steel Exterior
Constructed using industrial-grade Corten steel walls treated with marine-grade protective coatings, delivering decades of resistance against weathering, moisture, and pests.
318 SQ FTTotal Living Area
Studio / 1 BathEfficient Layout
20 ft ISO SteelUpcycled Container Frame
OR CCB / WA CLLicensed Construction
Compact & Sustainable Engineering
Why the SADU City 20′ is the Ideal Compact Container ADU
Designed for urban lots, secondary suites, and eco-friendly guest accommodations, the SADU City 20′ optimizes every square inch of space without sacrificing structural integrity or comfort.
Engineered from upcycled ISO shipping containers, the SADU (pronounced "say-dew") features a robust structural Corten steel exterior combined with energy-efficient interior framing, climate insulation, and high-end residential finishes. Its compact footprint makes it eligible for standard urban backyard placement in Oregon, Washington, and international markets requiring modular efficiency.
The SADU City 20′ includes an open-concept living area, a fully functional kitchen equipped with an induction cooktop, dedicated space for a washer/dryer combination, and a full three-piece bathroom with modern fixtures. Multiple roofline configurations—including sloped and flat modern profiles—are available to match local municipal zoning requirements and architectural aesthetic preferences.
SADU City 20′ Architectural Floor Plan
318 sq ft total footprint with optimized spatial flow, full bathroom, kitchen wall, and integrated utility connections.
Quality Craftsmanship
Built to Code Standards with Premium Components
Every unit is built inside our controlled manufacturing facility, ensuring precision assembly and rigorous quality control before delivery to your site.
Thermal & Energy Efficiency
Insulated beyond baseline residential code using high-performance closed-cell spray foam, preventing thermal bridging and minimizing heating/cooling energy requirements.
Natural Daylighting & Airflow
Strategic placement of dual-pane low-E glass windows maximize interior daylighting while maintaining thermal resistance and privacy on dense residential lots.
Durable Modern Interiors
Outfitted with commercial-grade scratch and moisture-resistant floorings, solid quartz countertops, custom cabinetry, and brushed metal hardware suited for high-occupancy use.
Turnkey & Shell Delivery Options
Available as a move-in-ready factory build or as a structural steel shell unit complete with framing, doors, and window installations for local trade completion.
International & Site Delivery
Engineered for simple transport via standard container chassis and site placement via crane, ideal for urban infill sites or remote locations worldwide.
Interior & Exterior Details
Explore the SADU City 20′ Experience
Take a closer look at completed units, interior layouts, and exterior structural finishes.
Model Lineup
Explore Other Container Floor Plans
Compare the SADU 20′ with our expanded 20ft and 40ft modular home options.
40ft Container Ramona 40′
Efficient single-bedroom layout offering expanded living area and full kitchen facilities.
1 bed1 bath453 sq ft
20ft Container De Lux Bungalow 20′
Bright single-bedroom bungalow designed with expanded side bump-outs for residential comfort.
1 bed1 bath517 sq ft
20ft Container De Lux River 20′
Spacious one-bedroom container design built for primary residences or vacation rentals.
1 bed1 bath599 sq ft
Frequently Asked Questions
Technical Specifications & Procurement FAQ
Answers to common structural, permitting, and international procurement questions regarding the SADU 20′.
What are the exact dimensions and footprint of the SADU 20′?
The SADU City 20′ is fabricated using standard 20-foot ISO shipping container dimensions combined with architectural roof and wall extensions, delivering approximately 318 square feet of interior usable floor space.
Does the SADU 20′ comply with local building codes and ADU zoning regulations?
Yes. Relevant Buildings designs and constructs homes in full compliance with state and municipal building codes in Oregon (CCB# 187113) and Washington (CL# RELEVBC785L9). International buyers can receive engineering plans formatted for regional approval.
Can global buyers purchase the SADU 20′ as a structural shell?
Yes, we export and deliver units as completed turnkey residences or as prefabricated structural shells (fully fabricated steel body, cutouts, framing, doors, and windows pre-installed) for cost-effective overseas shipping and local interior finishing.
What foundation type is required for container ADU placement?
The SADU 20′ can be installed on concrete piers, slab foundations, or helical pile systems depending on site soil conditions, local structural requirements, and accessibility.
Start Your Container ADU Project Today
Whether you need an urban backyard ADU, a modern guest house, or a commercial modular deployment, our engineering team is ready to assist with specs, logistics, and pricing.
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