Created a basic procedural generator. I'm going to rework it as a lot should be improved upon.

.editorconfig

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+[*.cs]
+
+# IDE0051: Remove unused private members
+dotnet_diagnostic.IDE0051.severity = none

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Assets/Scenes/SampleScene.unity

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Assets/Scripts/EditorInterface/GizmosHelper.cs

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+using UnityEngine;
+
+public static class GizmosHelper
+{
+    public static void DrawLine(Transform transform, Vector3 from, Vector3 to) => DrawPoints(transform, new Vector3[2]
+    {
+        from,
+        to
+    });
+    public static void DrawPoints(Transform transform, Vector3[] points)
+    {
+        // Apply rotation and position.
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+        for (int i = 0; i < points.Length; i++)
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+            Gizmos.DrawLine(points[i], points[(i + 1) % points.Length]);
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+    public static void DrawRect(Transform transform, Bounds bounds) => DrawPoints(transform, new Vector3[4]
+    {
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+        new Vector2(bounds.max.x, bounds.min.y),
+        new Vector2(bounds.max.x, bounds.max.y),
+        new Vector2(bounds.min.x, bounds.max.y)
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Assets/Scripts/ObjectModels/Singleton.cs

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+using UnityEngine;
+
+public abstract class Singleton<T> : MonoBehaviour
+    where T : Singleton<T>
+{
+    public static T Instance { get; private set; }
+
+    private void Awake()
+    {
+        if (Instance != null)
+        {
+            Debug.LogWarning($"Duplicate instance of {nameof(T)}! Ignoring this one.");
+            Destroy(this);
+            return;
+        }
+        Instance = (T)this;
+    }
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Assets/Scripts/RoomGeneration/DungeonGenerator.cs

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+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+public class DungeonGenerator : Singleton<DungeonGenerator>
+{
+    // TODO: Add a weighting system.
+
+    public Transform DungeonRoot;
+    public string StartingRoomId;
+    public Vector2Int RoomCountRange;
+
+    private RoomObject[] possibleRooms;
+
+    private void Start()
+    {
+        possibleRooms = Resources.LoadAll<RoomObject>("Rooms");
+        Debug.Log($"Loaded {possibleRooms.Length} room assets.");
+        MakeDungeon();
+    }
+
+    public void MakeDungeon()
+    {
+        int rooms = Random.Range(RoomCountRange.x, RoomCountRange.y + 1);
+        Debug.Log($"{rooms} rooms will be generated.");
+
+        List<RoomDoor> emptyDoors = new List<RoomDoor>();
+        RoomObject activeRoom = GetRoomById(StartingRoomId, true);
+        emptyDoors.AddRange(activeRoom.Doors);
+
+        while (rooms > 0 && emptyDoors.Count > 0)
+        {
+            // Pick random empty door and spawn a room there.
+            RoomDoor door = emptyDoors[Random.Range(0, emptyDoors.Count)];
+            RoomDoor matchingDoor = GetRoomDoorByTag(door.Tag, true);
+            if (matchingDoor == null)
+            {
+                emptyDoors.Remove(door);
+                continue;
+            }
+
+            matchingDoor.SetRoomRotationByDoor(door.transform.rotation.eulerAngles);
+            matchingDoor.SetRoomPositionByDoor(door.transform.position);
+
+            List<RoomDoor> extraDoors = new List<RoomDoor>(matchingDoor.Room.Doors);
+            extraDoors.Remove(matchingDoor);
+            emptyDoors.AddRange(extraDoors);
+
+            rooms--;
+        }
+    }
+
+    public RoomObject GetRoomById(string id, bool instantiate)
+    {
+        RoomObject[] could = possibleRooms.Where(x => x.Identifier.StartsWith(id)).ToArray();
+        RoomObject chosen = could[Random.Range(0, could.Length)];
+
+        if (instantiate) return Instantiate(chosen, DungeonRoot);
+        else return chosen;
+    }
+    public RoomDoor GetRoomDoorByTag(string tag, bool instantiate)
+    {
+        RoomObject[] could = possibleRooms.Where(x => x.Doors.Any(y => y.Tag.StartsWith(tag))).ToArray();
+        if (could.Length == 0) return null;
+
+        RoomObject chosen = could[Random.Range(0, could.Length)];
+        if (instantiate) chosen = Instantiate(chosen, DungeonRoot);
+
+        RoomDoor[] couldDoors = chosen.Doors.Where(x => x.Tag.StartsWith(tag)).ToArray();
+        return couldDoors[Random.Range(0, couldDoors.Length)];
+    }
+}

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Assets/Scripts/RoomGeneration/RoomDoor.cs

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+using UnityEngine;
+
+public class RoomDoor : RoomItem
+{
+    public string Tag;
+
+    public void SetRoomRotationByDoor(Vector3 desiredDoorRotation)
+    {
+        Room.transform.rotation *= Quaternion.FromToRotation(Room.transform.rotation.eulerAngles, desiredDoorRotation);
+    }
+    public void SetRoomPositionByDoor(Vector2 desiredDoorPosition)
+    {
+        Vector2 curPos = transform.position;
+        Vector2 diff = desiredDoorPosition - curPos;
+
+        Room.transform.position += (Vector3)diff;
+    }
+}

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Assets/Scripts/RoomGeneration/RoomItem.cs

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+using UnityEngine;
+
+[ExecuteAlways]
+public abstract class RoomItem : MonoBehaviour
+{
+    public RoomObject Room { get; private set; }
+
+    private void Awake()
+    {
+        Room = GetComponentInParent<RoomObject>();
+    }
+
+    private void Update()
+    {
+        if (!Application.isPlaying)
+        {
+            EditorUpdate();
+            return;
+        }
+    }
+    private void EditorUpdate()
+    {
+        Awake();
+        if (Room == null)
+        {
+            Debug.LogError("A room item must have a parent room.");
+            return;
+        }
+    }
+
+    private void OnDrawGizmosSelected()
+    {
+        Room.OnDrawGizmosSelected();
+    }
+}

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Assets/Scripts/RoomGeneration/RoomObject.cs

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+using UnityEngine;
+
+[ExecuteAlways]
+public class RoomObject : MonoBehaviour
+{
+    public string Identifier;
+    public Bounds Bounds;
+    public RoomDoor[] Doors;
+
+    private void Awake()
+    {
+        Doors = GetComponentsInChildren<RoomDoor>();
+    }
+
+    private void Update()
+    {
+        if (!Application.isPlaying)
+        {
+            EditorUpdate();
+            return;
+        }
+    }
+    private void EditorUpdate()
+    {
+        Awake();
+        if (Bounds.extents.z != 0 || Bounds.center.z != 0)
+        {
+            Bounds.extents = (Vector2)Bounds.extents;
+            Bounds.size = (Vector2)Bounds.size;
+        }
+    }
+
+    internal void OnDrawGizmos()
+    {
+        // Draw room mesh.
+        Gizmos.color = new Color(1, 0.5f, 0); // Orange
+        foreach (RoomDoor roomDoor in Doors)
+        {
+            GizmosHelper.DrawLine(transform, roomDoor.transform.localPosition, Bounds.center);
+        }
+    }
+    internal void OnDrawGizmosSelected()
+    {
+        // Draw room bounds.
+        Gizmos.color = Color.white;
+        GizmosHelper.DrawRect(transform, Bounds);
+
+        // Draw each door.
+        Gizmos.color = Color.green;
+        Bounds doorBounds = new Bounds(Vector2.zero, new Vector2(2, 1));
+        foreach (RoomDoor door in Doors)
+        {
+            GizmosHelper.DrawRect(door.transform, doorBounds);
+        }
+    }
+}

Assets/Scripts/RoomGeneration/RoomObject.cs.meta

@@ -0,0 +1,11 @@
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+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
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