Designing a duplex house involves creating two separate living units within the same structure, typically with separate entrances and shared walls. Here’s a basic outline of considerations for designing a duplex house:

• Space Planning: Allocate space for each unit, considering factors like the number of bedrooms, bathrooms, kitchen size, living area, dining area, and storage space.
• Entrances: Each unit should have its own entrance to ensure privacy and independence for the occupants.
• Shared Walls: Since duplex units share walls, ensure proper insulation to minimise noise transfer between units.
• Floor Plan: Opt for an efficient floor plan that maximises space utilisation and functionality. You can choose between side-by-side or stacked layouts depending on the available land and your preferences.
• Utilities: Determine how utilities such as water, electricity, and gas will be shared or separated between units.
• Aesthetics: Decide on the exterior design that reflects the overall style and complements the surrounding neighbourhood. You may choose to make each unit look distinct or maintain a cohesive appearance.
• Parking: Allocate adequate parking space for each unit, whether it’s a garage, carport, or designated parking area.
• Outdoor Spaces: Consider incorporating outdoor spaces such as balconies, patios, or yards for each unit, providing residents with private outdoor areas.
• Legal Considerations: Ensure compliance with local building codes, zoning regulations, and any other legal requirements for duplex construction.
• Accessibility: If needed, design the duplex to be accessible for people with disabilities, considering features like ramps, wider doorways, and accessible bathrooms.
• Natural Light and Ventilation: Incorporate ample windows and ventilation to enhance the comfort and livability of both units.
• Privacy: Design the layout to maximise privacy between units, with considerations for window placements and shared outdoor spaces.
• Flexibility: Consider designing flexible spaces that can serve multiple purposes, adapting to the changing needs of the occupants over time.
• Sustainability: Integrate energy-efficient features and sustainable materials to reduce environmental impact and long-term operating costs.
• Consultation: Work with architects, engineers, and contractors experienced in duplex construction to ensure a well-designed and structurally sound building.

By carefully considering these aspects, you can create a well-designed duplex house that meets the needs and preferences of its occupants while adhering to practical and regulatory requirements.