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Planning a duplex or triplex house on your plot
A duplex is one home spread over two connected floors; a triplex spans three. They suit families who want bedrooms upstairs and living spaces below, or a rental unit on one floor and a duplex home above.
What to plan for
- Internal staircase: about 100–120 sq ft on each connected floor.
- Double-height living: a tall glass bay over the living area makes a duplex feel spacious; the 3D view shows it on the elevation.
- Floor areas: a 30×40 plot gives about 745 sq ft per floor (Stilt + 2), enough for a compact 2–3 BHK duplex across two floors; a 40×60 plot gives about 1,677 sq ft per floor.
- Vastu: staircases are commonly preferred in the south, south-west or west (general guidance).
Try it in the planner
Choose your floors, tick Duplex or Triplex and pick which floors connect (for example floors 1–2). The 3D elevation shows the double- or triple-height glazing, and the Floor-by-floor table lets you plan rooms on each connected floor.
Questions
What is the difference between a duplex and a triplex?
A duplex is one home over two connected floors with an internal staircase; a triplex spans three connected floors.
Can I build a duplex on a 30×40 plot?
Yes. With about 745 sq ft buildable per floor (Stilt + 2), a compact 2–3 BHK duplex across two floors is common.
Does a duplex change the setbacks?
No. Setbacks depend on your plot, road width and total building height, not on whether floors are connected as a duplex.
More guides
Figures are indicative, for early planning only. Confirm the final design, setbacks, heights and parking with GHMC, HMDA or your local authority and a qualified architect before you build.