Key takeaways
- Corner joints: reinforcement cost roughly doubles where two wall lines meet. Minimize corners by using rectangles instead of L-shapes — a 6×6 rectangle has 4 corners; a same-area L-shape can have 6 or more.
- Wall thickness: one tile of wall is sufficient for the perimeter. Doubling walls inward eats floor tiles twice over — once for the wall, once for the lost interior space.
- Interior fallback line: place a partial wall or barricade one tile inside the main door. That single tile converts a single-chokepoint base into one with a fighting retreat, and it costs one floor tile plus two wall segments.
- Exterior clearance: keep the outside face of your perimeter clear for at least two tiles where you expect attackers to path. Walls buried behind terrain features cannot be flanked, but they also can’t be reinforced from outside.
Build Ur Base Chapter 3 Guide: Room Layouts That Don’t Waste a Single Tile
The direct answer to Chapter 3’s layout puzzle is this: build a 5×5 or 6×6 room module, keep every doorway a 1×1 opening on a wall you can fortify, and cluster storage along interior walls rather than the perimeter — that combination keeps your base defensible while costing you the least buildable floor area. Chapter 3 tightens both the tile budget and the footprint limits you had in Chapter 2, so layouts that worked before now leave you with unusable dead space or a wall you cannot reinforce in time.
What Changes in Chapter 3
Chapter 3 introduces a hard footprint cap per structure and a stricter floor-tile allowance. In practice that means three things: you can no longer sprawl a single long wall to enclose a large yard, corner tiles cost you two walls’ worth of reinforcement instead of one, and any floor tile occupied by furniture is a tile you cannot later convert to a defensive position. The chapter’s layout problem is therefore not “how big can I build” but “how little can I build and still hold.”
| Layout Module | Floor Tiles Used | Wall Segments Needed | Doorways (1×1) | Usable Storage Tiles | Defensive Coverage |
|---|---|---|---|---|---|
| 3×3 closet base | 9 | 12 | 1 | 2 | Poor — single chokepoint, no fallback |
| 4×4 starter | 16 | 16 | 1 | 4 | Weak — no interior lines |
| 5×5 standard | 25 | 20 | 1–2 | 7 | Good — one interior fallback line |
| 6×6 expanded | 36 | 24 | 2 | 12 | Strong — two fallback lines, crossfire |
| 6×9 compound | 54 | 30 | 2–3 | 18 | Strong but wasteful — dead center tiles |
Notice the ratio shift: a 5×5 costs 20 wall segments for 25 floor tiles, while a 6×6 costs 24 segments for 36 tiles. Bigger modules use wall material more efficiently per floor tile, which is why the 6×6 is the sweet spot in Chapter 3 once your material income supports it — and why the 3×3, despite being cheapest, is almost never worth committing to.
Spacing Walls So They Still Work
Leave at least one full tile of interior walkable width behind any wall you intend to defend from. A wall with no interior access tile behind it is a wall you can only repair from outside, which is the most common cause of a lost base in this chapter. Concretely:
- Corner joints: reinforcement cost roughly doubles where two wall lines meet. Minimize corners by using rectangles instead of L-shapes — a 6×6 rectangle has 4 corners; a same-area L-shape can have 6 or more.
- Wall thickness: one tile of wall is sufficient for the perimeter. Doubling walls inward eats floor tiles twice over — once for the wall, once for the lost interior space.
- Interior fallback line: place a partial wall or barricade one tile inside the main door. That single tile converts a single-chokepoint base into one with a fighting retreat, and it costs one floor tile plus two wall segments.
- Exterior clearance: keep the outside face of your perimeter clear for at least two tiles where you expect attackers to path. Walls buried behind terrain features cannot be flanked, but they also can’t be reinforced from outside.
Door Placement: One Door Beats Two
Every doorway you cut is a hole in your defensive perimeter, and in Chapter 3 the pathing logic will use the shortest opening. Rules that hold up:
- One primary door per module. A second door is justified only if it shortens your own haul distance enough to matter — roughly when it saves you more than a third of the trip length to your resource stash.
- Offset, don’t center. A door centered on a 6-tile wall gives attackers a straight line to your core. Offsetting it by one or two tiles forces a turn inside, which is where your fallback line does its work.
- Never two doors facing each other on opposite walls. That creates a through-line straight across your base and converts your interior into a corridor.
- Door + storage adjacency: put your first storage cluster within two tiles of the door. Long interior trips cost time you don’t have during a raid.
Storage Without Losing Floor Area
Storage is the biggest silent floor-tile thief in Chapter 3. The fix is to treat storage as wall-adjacent furniture, not as rooms.
- Line the interior faces of perimeter walls with storage. These tiles are already “spent” — they sit against a wall and cannot be used as a fighting position anyway, so storage there costs zero tactical floor.
- Leave the center open. On a 6×6, the central 2×2 (four tiles) should stay empty. Those four tiles are your movement lane and your emergency fallback.
- Group by function, not by type. Keep crafting inputs next to the crafting station, not in a separate storage room. A dedicated storage room on a 6×6 costs you 9–12 tiles for no defensive value.
- Vertical storage where available: stacked or shelved storage occupies one floor tile for two or three storage slots. If Chapter 3 offers it, it’s the single highest-value footprint upgrade on the list.
Choosing Your Layout by Situation
| Your Situation | Recommended Module | Why |
|---|---|---|
| Early Chapter 3, low materials | 4×4, one door, expand east later | Cheap to enclose; leave a flat wall face for expansion |
| Frequent raids, solo play | 5×5 with offset door + fallback line | Survivable chokepoint; 7 usable storage tiles is enough |
| Two or more players sharing a base | 6×6, two offset doors on different walls | Separate entry lanes stop players blocking each other |
| Heavy crafting / resource hoarding | 6×6 core + 3×3 attached workshop | Keeps bulk storage out of the fighting lane |
| Terrain with a natural chokepoint | 5×5 built into the chokepoint | Terrain replaces two wall segments for free |
Assembly and Expansion Realities
Build the expansion direction into the first plan. Leave one full flat wall face — no corners, no doors, no storage against it — so you can extend later without demolishing. Extending a 5×5 into a 5×8 costs 15 new wall segments and 15 floor tiles, versus tearing down and rebuilding a 6×6, which costs the full 24 segments and 36 tiles again. In footprint-limited chapters, the player who plans one expansion wall ahead typically gets a larger final base out of the same material budget.
Also plan your material hauling: a wall segment usually needs its material delivered to the tile it occupies, so interior walls far from your entrance cost more travel time per segment than perimeter walls near the door. When you have a choice between two equally good wall lines, build the one closer to your stockpile first.
Quick FAQ
Is a 6×6 always better than a 5×5 in Chapter 3?
No. A 6×6 uses 11 more floor tiles and 4 more wall segments than a 5×5. Take it only once your material income can replace losses without stalling — otherwise the 5×5’s lower replacement cost wins over the 6×6’s better coverage.
How many doors can I safely cut?
One per module for most players. A second door is worth it only when it cuts your hauling route by more than roughly a third and you can fortify both openings.
Where should the first storage go?
Against an interior wall face within two tiles of your primary door. That location costs no usable fighting floor and keeps retrieval fast during a raid.
