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The TVO Duplex design offers two mirror-image tiny homes joined together to look like a single-family dwelling. This approach works well for in-law apartments, ADUs, or multi-generational living situations where family members want their own space while staying on the same property.
Each 340-square-foot unit includes a living room, kitchen, bathroom, downstairs bedroom, and upper loft. The sleek, modern design features plenty of windows for natural light and clean lines throughout. The plans are International Residential Code compliant, making permitting easier than many tiny house designs.
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680 Sq Ft Duplex Cabin with Two Independent Units
Images via Small House Catalog
Clean Lines and Modern Interior Design
Images via Small House Catalog
Large Operable Windows for Natural Light and Ventilation
Images via Small House Catalog
Mirror-Image Floor Plans for Each Unit
Images via Small House Catalog
Complete Living Space in Each 340 Sq Ft Unit
Images via Small House Catalog
Single-Family Dwelling Appearance from Exterior
Images via Small House Catalog
Design Details
- Plan Name: TVO Duplex
- Total Size: 680 sq ft conditioned space (both units combined)
- Unit Size: 340 sq ft per unit
- Configuration: Two mirror-image units
- Dimensions: 20′ x 38′
- Wall Height: 9′-0″
- Per Unit: 1 bedroom, 1 bathroom, 1 loft, living room, kitchen
- Walls: 2×6 R-21+ insulation
- Roof: Trussed R-49+ insulation
- Foundation: Insulated slab
- Heating/Cooling: Mini-split system
- Water Heating: Tankless
- Optional: Wood or gas fireplace
- Code Compliance: International Residential Code compliant
- Plans Format: Instant PDF download
- License: Build one house per purchase
Lessons from This Duplex Tiny House Design
The TVO Duplex offers insights for multi-family tiny living:
- Duplex designs can look like single-family homes – Mirror-image layouts create unified exteriors that fit residential neighborhoods
- ADU regulations are expanding – More communities now accept in-law apartments and accessory dwelling units
- IRC compliance simplifies permitting – Building to International Residential Code standards eases the approval process
- 340 sq ft can include all essentials – Bedroom, bathroom, kitchen, living room, and loft fit in each unit
- High insulation values improve efficiency – R-21 walls and R-49 roof reduce energy costs
- Mini-splits provide efficient climate control – Ductless systems work well in small spaces
- Tankless water heaters save space – No storage tank means more usable square footage
- Lofts add flexible space – Upper areas can serve as sleeping, storage, or office space
- Multi-generational living works with separation – Private units allow family proximity without sacrificing independence
- Rental income potential offsets costs – One unit can generate income while you live in the other
Learn More
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Alex
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