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Doors & Windows

Doors and Windows are separate shape categories in Buildopia, each with their own dedicated sidebar section that appears when that shape is active. Both share two features — Combine and Position — that make touching pieces line up cleanly and let you control how deep within a cell the piece sits.

Selecting Door or Window

Select Door or Window in the Shape section of the sidebar. The material palette updates immediately to show only materials compatible with that shape, and the corresponding Door or Window section appears below Shape with shape-specific controls.

The Door Section

With the Door shape active, the Door section reveals the Combine toggle and Position controls. Select your door material from the palette to get started — most door materials work with Combine, with a few exceptions noted below.

Door Combine

When two doors are placed side by side, the Combine option mirrors their handles to the shared side, so they form a proper double doorway. Without Combine, both doors would have handles on the same side (or whichever side each door's model defaults to), which doesn't read as a set of double doors.

Combine is on by default whenever you switch to the Door shape. Turn it off if you want individual single doors that don't interact with their neighbours.

Four door materials don't support Combine: Shutter, Wooden Gate, Swinging Doors, and Iron Gate. For these, the Combine button is hidden. Reasons vary: Swinging Doors is already a double-leaf design; Wooden Gate and Shutter don't have handles in an edge position where combining would be meaningful; Iron Gate's design has no combine variant.

Door Position

Position controls where the door sits within its cell along the depth axis:

This matters when you're placing a door in a wall — you might want it flush with the exterior face, flush with the interior face, or centred in the wall's thickness. Middle works for most cases; Front and Back are for when you need the door to line up exactly with one face of the wall.

Not all door materials support all three positions — some only offer Middle. The buttons for unavailable positions will be greyed out.

The Window Section

Switching to the Window shape reveals the Window section with its own Combine and Position controls. The controls work the same way as for Door, with a few differences noted below.

Window Combine

Window Combine merges the shared edge between two touching Wooden Window frames, hiding the join so a run of windows reads as one continuous wide window instead of several separate frames with visible dividers between them.

Unlike Door Combine, which works across most door materials, Window Combine only affects Wooden Window — it's the only window material with a combine variant. The Combine button appears automatically when Wooden Window is selected, and disappears for all other window materials.

If you repaint a combined Wooden Window to a different material, it automatically un-combines, since the other materials don't have combine variants.

Window Position

Window Position works like Door Position, with one addition. Most window materials offer Front, Middle, and Back. Some materials also offer Top and Bottom positions, for pieces like hatches that sit flat rather than upright — these position the piece at the top or bottom face of the cell rather than the front or back.

Glass Window is an exception: it's always centred in the middle of its cell and doesn't offer any position controls.

DLC 1 Additions

DLC 1 adds three new window materials — Submarine Window, Hatch, and Ornate Window — and four new door materials — Interior Door, Submarine Door, Ornate Door, and Ocean Door. All four new doors support Combine, mirroring handles at the shared side just like the base door materials. For the full DLC 1 breakdown, see the DLC 1 Materials guide.