Upgrade path

Red Iron Door→ 1× Steel Door →Steel Door

Hit a placed block with a stone axe, claw hammer or nail gun while carrying the material of the next step: 6 hits per upgrade.

Crafting

Craft at Backpack · makes 1

Crafted as Iron Door: pick this one of its variants when you place it.

Harvest drops

Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.

Drops when destroyed

When it collapses

Falling, it leaves Scrap Metal Pile (75% of the time) where it lands.

Where to find (3 POIs)

Coleman's Drive-In (tier 4), Soyer Family Farm (tier 3), The Asgård Residence (tier 2).

Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.