Building a multi-story floor plan
Real homes have more than one floor. Add storeys (and basements) that stack automatically, connect them with stairs, and walk between them in 3D.
Most homes aren't a single floor. RoomSketch3D lets you stack multiple storeys — a second floor, a loft, a basement — that line up automatically and connect with stairs you can walk up in 3D.
The workflow is simple: build the ground floor, add the next floor and shape it over the one below, then drop in the stairs to connect them.
Step by step
- 1
Build the ground floor
Draw your ground floor as usual — exterior walls, rooms, doors, windows, and fixtures. This is the floor every other storey stacks on, so get its outline right first.
- 2
Add a floor
Open the Floors panel (top-left) and Add Floor. You get three choices: Copy first floor (same outline as the ground floor, minus its interior walls), Draw from scratch (a blank canvas with the floor below shown as a guide), or Add a loft (a smaller partial floor above). New storeys stack on top automatically; you can also add a basement below.
Three ways to add a floor: copy the ground floor, start blank, or add a loft. - 3
Shape the new floor over the one below
The new floor opens in the editor with a faint guide underlay showing the floor below, so you can line up exterior walls and stair openings. Drag each corner to shape the floor over the rooms below — for a loft, position it above the part of the home you want to overlook.
The “FIRST FLOOR” underlay lets you align the new floor over the one below. - 4
Add stairs to connect the floors
Back on the lower floor, place a staircase (Build Panel → Stairs) where you want to reach the floor above — for a loft, the center of the living room works well. As you draw, the editor tints the floor above in blue and prompts you to drop the stair head onto it, so the two floors connect exactly where they should. Add railings down the side.
The blue “FLOOR ABOVE” guide snaps the staircase to where the two floors meet. - 5
Build out the upper floor
Add the upper floor's interior walls, doors, windows, and fixtures — everything works exactly as it does on the ground floor. For a loft, make the open edge a pony wall (select the wall → Style → Railing → Pony) so it overlooks the floor below, and add an opening where the stairs arrive.
- 6
Walk between floors in 3D
Switch to 3D View. The floors render stacked, the stairs connect them, and in walk mode you can climb between floors.
The finished two-story home in 3D — loft, staircase, and ground floor together. - 7
Export per floor or the whole house
Export a per-floor PNG for each level, or the whole house as a 3D model (GLB).
Tips
Add the floor, then the stairs
Add and shape the upper floor first, then draw the staircase on the lower floor — the blue floor-above guide lets you connect the stairs to exactly the right spot.
Use the underlay to align walls
Trace the upper floor's exterior walls directly over the guide underlay so the storeys stack cleanly and the roofline looks right in 3D.
Frequently asked questions
Can I design a two-story house?
Yes. Add a second floor from the Floors panel; it stacks on top of the ground floor automatically. You can add more storeys and a basement too.
How do floors connect?
With stairs. Place a staircase on the lower floor and it auto-links to the floor above, leaving the opening. In 3D walk mode you can climb between floors.
Can I see the floor below while drawing the next one?
Yes — a 2D guide underlay shows the floor below so you can align exterior walls and stair openings as you draw.
Can I export each floor separately?
Yes — export a per-floor PNG for each level, or the whole house as a 3D GLB model.
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