diff --git a/README.md b/README.md
index 203b38a..3fc4db1 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,11 @@ A Rust desktop app for generating simple tabletop dungeon layouts.
 - Corridor controls:
   - `Corridor Randomness (%)` from `0` to `100`
   - `Dead-End Rooms (%)` from `0` to `50`
+- Door controls:
+  - `Door Frequency (%)`
+  - `Room/Hallway Door Chance (%)`
+  - `Locked Door Chance (%)`
+  - `Allow Middle Corridor Doors` toggle
 - Generate control:
   - Master seed input (`u64`)
   - `Random` seed button
@@ -28,6 +33,10 @@ A Rust desktop app for generating simple tabletop dungeon layouts.
 - Corridors are stored separately as vector line segments between grid cells.
 - Every generated room is connected into one navigable network when possible.
 - A master seed drives deterministic generation, and internal subsystems derive their own sub-seeds from it.
+- Doors are generated from corridor adjacency:
+  - Open doors are rendered in red
+  - Locked doors are rendered in green
+  - Doors are rendered as line segments on grid boundaries
 
 ### Corridor Randomness
 
diff --git a/src/layout.rs b/src/layout.rs
index 7b12f07..5c7f521 100644
--- a/src/layout.rs
+++ b/src/layout.rs
@@ -25,10 +25,27 @@ pub struct Corridor {
     pub path: Vec<(usize, usize)>,
 }
 
+#[derive(Debug, Clone)]
+pub struct Door {
+    pub from: (usize, usize),
+    pub to: (usize, usize),
+    pub locked: bool,
+    pub archway: bool,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct DoorSettings {
+    pub frequency_percent: usize,
+    pub room_hallway_percent: usize,
+    pub locked_percent: usize,
+    pub allow_middle_corridor_doors: bool,
+}
+
 #[derive(Debug, Clone, Default)]
 pub struct DungeonLayout {
     pub rooms: Vec<Room>,
     pub corridors: Vec<Corridor>,
+    pub doors: Vec<Door>,
 }
 
 pub fn generate_layout(
@@ -41,6 +58,7 @@ pub fn generate_layout(
     square_rooms_only: bool,
     corridor_randomness_percent: usize,
     dead_end_room_percent: usize,
+    door_settings: DoorSettings,
 ) -> DungeonLayout {
     let layout_salt = ((cols as u64) << 48)
         ^ ((rows as u64) << 32)
@@ -58,7 +76,11 @@ pub fn generate_layout(
     let mut corridors = Vec::new();
 
     if cols < 2 || rows < 2 || target_room_count == 0 {
-        return DungeonLayout { rooms, corridors };
+        return DungeonLayout {
+            rooms,
+            corridors,
+            doors: Vec::new(),
+        };
     }
 
     let mut min_size = min_room_size.max(2);
@@ -74,7 +96,11 @@ pub fn generate_layout(
     }
 
     if min_size == 0 || max_size < min_size {
-        return DungeonLayout { rooms, corridors };
+        return DungeonLayout {
+            rooms,
+            corridors,
+            doors: Vec::new(),
+        };
     }
 
     let max_attempts = target_room_count.saturating_mul(40).max(50);
@@ -121,7 +147,11 @@ pub fn generate_layout(
     }
 
     if rooms.len() < 2 {
-        return DungeonLayout { rooms, corridors };
+        return DungeonLayout {
+            rooms,
+            corridors,
+            doors: Vec::new(),
+        };
     }
 
     let randomness = (corridor_randomness_percent.min(100) as f32) / 100.0;
@@ -162,7 +192,64 @@ pub fn generate_layout(
         }
     }
 
-    DungeonLayout { rooms, corridors }
+    let mut layout = DungeonLayout {
+        rooms,
+        corridors,
+        doors: Vec::new(),
+    };
+    apply_doors(&mut layout, seed, door_settings);
+    layout
+}
+
+pub fn apply_doors(layout: &mut DungeonLayout, seed: u64, settings: DoorSettings) {
+    layout.doors.clear();
+
+    let mut rng = SimpleRng::new(seed::derive_seed(seed, 0xD005_5EED_u64));
+    let base = (settings.frequency_percent.min(100) as f32) / 100.0;
+    let room_hall = (settings.room_hallway_percent.min(100) as f32) / 100.0;
+    let locked = (settings.locked_percent.min(100) as f32) / 100.0;
+
+    let mut seen_edges = HashSet::new();
+    for corridor in &layout.corridors {
+        for pair in corridor.path.windows(2) {
+            if pair[0] == pair[1] {
+                continue;
+            }
+            let edge = normalized_cell_edge(pair[0], pair[1]);
+            if !seen_edges.insert(edge) {
+                continue;
+            }
+
+            let a_in_room = room_index_at_cell(&layout.rooms, edge.0).is_some();
+            let b_in_room = room_index_at_cell(&layout.rooms, edge.1).is_some();
+            let is_room_hallway = a_in_room ^ b_in_room;
+            let is_middle = !a_in_room && !b_in_room;
+
+            if is_room_hallway {
+                let door_chance = base * room_hall;
+                let place_door = door_chance > 0.0 && rng.next_f32() <= door_chance;
+
+                layout.doors.push(Door {
+                    from: edge.0,
+                    to: edge.1,
+                    locked: place_door && rng.next_f32() <= locked,
+                    archway: !place_door,
+                });
+                continue;
+            }
+
+            if is_middle && settings.allow_middle_corridor_doors {
+                if base > 0.0 && rng.next_f32() <= base {
+                    layout.doors.push(Door {
+                        from: edge.0,
+                        to: edge.1,
+                        locked: rng.next_f32() <= locked,
+                        archway: false,
+                    });
+                }
+            }
+        }
+    }
 }
 
 fn build_room_connection_edges(
@@ -470,6 +557,19 @@ fn manhattan_distance(a: (usize, usize), b: (usize, usize)) -> usize {
     a.0.abs_diff(b.0) + a.1.abs_diff(b.1)
 }
 
+fn room_index_at_cell(rooms: &[Room], cell: (usize, usize)) -> Option<usize> {
+    rooms.iter().position(|room| {
+        cell.0 >= room.x
+            && cell.0 < room.x + room.width
+            && cell.1 >= room.y
+            && cell.1 < room.y + room.height
+    })
+}
+
+fn normalized_cell_edge(a: (usize, usize), b: (usize, usize)) -> ((usize, usize), (usize, usize)) {
+    if a <= b { (a, b) } else { (b, a) }
+}
+
 struct SimpleRng {
     state: u64,
 }
diff --git a/src/main.rs b/src/main.rs
index 69718f9..329ac25 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,7 +7,7 @@ use std::collections::HashSet;
 
 use eframe::egui;
 use egui::{Color32, Stroke};
-use layout::{DungeonLayout, shortest_path_cells};
+use layout::{DoorSettings, DungeonLayout, shortest_path_cells};
 use ui::{UiSettings, draw_side_panel};
 
 fn main() -> eframe::Result<()> {
@@ -39,6 +39,7 @@ impl Default for DungeonApp {
             settings.square_rooms_only,
             settings.corridor_randomness,
             settings.dead_end_rooms_percent,
+            door_settings_from_ui(&settings),
         );
         Self {
             settings,
@@ -92,6 +93,7 @@ impl DungeonApp {
             self.settings.square_rooms_only,
             self.settings.corridor_randomness,
             self.settings.dead_end_rooms_percent,
+            door_settings_from_ui(&self.settings),
         );
     }
 
@@ -185,6 +187,7 @@ impl DungeonApp {
         self.layout.rooms[drag.room_idx].x = new_x;
         self.layout.rooms[drag.room_idx].y = new_y;
         self.reroute_corridors_for_room(drag.room_idx);
+        self.refresh_doors();
     }
 
     fn reroute_corridors_for_room(&mut self, room_idx: usize) {
@@ -253,6 +256,15 @@ impl DungeonApp {
         };
 
         self.layout.corridors[drag.corridor_index].path = new_path;
+        self.refresh_doors();
+    }
+
+    fn refresh_doors(&mut self) {
+        layout::apply_doors(
+            &mut self.layout,
+            self.settings.seed,
+            door_settings_from_ui(&self.settings),
+        );
     }
 }
 
@@ -405,6 +417,23 @@ fn draw_layout(painter: &egui::Painter, geometry: &GridGeometry, layout: &Dungeo
         painter.rect_filled(room_rect, 0.0, room_fill);
         painter.rect_stroke(room_rect, 0.0, outline_stroke, egui::StrokeKind::Middle);
     }
+
+    for door in &layout.doors {
+        let color = if door.archway {
+            Color32::from_rgb(70, 130, 220)
+        } else if door.locked {
+            Color32::from_rgb(80, 200, 120)
+        } else {
+            Color32::from_rgb(220, 70, 70)
+        };
+        draw_door_line(
+            painter,
+            geometry,
+            door.from,
+            door.to,
+            Stroke::new(3.0, color),
+        );
+    }
 }
 
 fn cell_rect(geometry: &GridGeometry, col: usize, row: usize) -> egui::Rect {
@@ -495,3 +524,38 @@ fn simplify_path_loops(path: &mut Vec<(usize, usize)>) {
     }
     *path = out;
 }
+
+fn door_settings_from_ui(settings: &UiSettings) -> DoorSettings {
+    DoorSettings {
+        frequency_percent: settings.door_frequency_percent,
+        room_hallway_percent: settings.room_hallway_door_percent,
+        locked_percent: settings.locked_door_percent,
+        allow_middle_corridor_doors: settings.allow_middle_corridor_doors,
+    }
+}
+
+fn draw_door_line(
+    painter: &egui::Painter,
+    geometry: &GridGeometry,
+    a: (usize, usize),
+    b: (usize, usize),
+    stroke: Stroke,
+) {
+    if a.0.abs_diff(b.0) + a.1.abs_diff(b.1) != 1 {
+        return;
+    }
+
+    if a.0 != b.0 {
+        let x = geometry.rect.left() + (a.0.max(b.0) as f32) * geometry.cell_size;
+        let row = a.1;
+        let y0 = geometry.rect.top() + row as f32 * geometry.cell_size;
+        let y1 = y0 + geometry.cell_size;
+        painter.line_segment([egui::pos2(x, y0), egui::pos2(x, y1)], stroke);
+    } else {
+        let y = geometry.rect.top() + (a.1.max(b.1) as f32) * geometry.cell_size;
+        let col = a.0;
+        let x0 = geometry.rect.left() + col as f32 * geometry.cell_size;
+        let x1 = x0 + geometry.cell_size;
+        painter.line_segment([egui::pos2(x0, y), egui::pos2(x1, y)], stroke);
+    }
+}
diff --git a/src/ui.rs b/src/ui.rs
index c9f2cf3..4eb888f 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -27,6 +27,10 @@ pub struct UiSettings {
     pub square_rooms_only: bool,
     pub corridor_randomness: usize,
     pub dead_end_rooms_percent: usize,
+    pub door_frequency_percent: usize,
+    pub room_hallway_door_percent: usize,
+    pub locked_door_percent: usize,
+    pub allow_middle_corridor_doors: bool,
     active_tab: Tab,
 }
 
@@ -42,6 +46,10 @@ impl Default for UiSettings {
             square_rooms_only: false,
             corridor_randomness: 0,
             dead_end_rooms_percent: 0,
+            door_frequency_percent: 30,
+            room_hallway_door_percent: 70,
+            locked_door_percent: 25,
+            allow_middle_corridor_doors: false,
             active_tab: Tab::Generate,
         }
     }
@@ -227,4 +235,65 @@ fn draw_layout_tab(ui: &mut egui::Ui, settings: &mut UiSettings, result: &mut Si
             )
             .changed();
     });
+
+    ui.add_space(12.0);
+    ui.separator();
+    ui.add_space(8.0);
+    ui.label(RichText::new("Door Settings").strong());
+    ui.add_space(8.0);
+
+    ui.label("Door Frequency (%)");
+    ui.horizontal(|ui| {
+        result.settings_changed |= ui
+            .add(egui::Slider::new(&mut settings.door_frequency_percent, 0..=100).show_value(false))
+            .changed();
+        result.settings_changed |= ui
+            .add(
+                egui::DragValue::new(&mut settings.door_frequency_percent)
+                    .speed(1.0)
+                    .range(0..=100),
+            )
+            .changed();
+    });
+
+    ui.add_space(8.0);
+    ui.label("Room/Hallway Door Chance (%)");
+    ui.horizontal(|ui| {
+        result.settings_changed |= ui
+            .add(
+                egui::Slider::new(&mut settings.room_hallway_door_percent, 0..=100)
+                    .show_value(false),
+            )
+            .changed();
+        result.settings_changed |= ui
+            .add(
+                egui::DragValue::new(&mut settings.room_hallway_door_percent)
+                    .speed(1.0)
+                    .range(0..=100),
+            )
+            .changed();
+    });
+
+    ui.add_space(8.0);
+    ui.label("Locked Door Chance (%)");
+    ui.horizontal(|ui| {
+        result.settings_changed |= ui
+            .add(egui::Slider::new(&mut settings.locked_door_percent, 0..=100).show_value(false))
+            .changed();
+        result.settings_changed |= ui
+            .add(
+                egui::DragValue::new(&mut settings.locked_door_percent)
+                    .speed(1.0)
+                    .range(0..=100),
+            )
+            .changed();
+    });
+
+    ui.add_space(8.0);
+    result.settings_changed |= ui
+        .checkbox(
+            &mut settings.allow_middle_corridor_doors,
+            "Allow Middle Corridor Doors",
+        )
+        .changed();
 }