diff --git a/asm/houseDoorExterior.s b/asm/houseDoorExterior.s
deleted file mode 100644
index 50b7a415..00000000
--- a/asm/houseDoorExterior.s
+++ /dev/null
@@ -1,418 +0,0 @@
-	.include "asm/macros.inc"
-
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start HouseDoorExterior
-HouseDoorExterior: @ 0x080866C0
-	push {lr}
-	ldr r2, _080866D4 @ =gUnk_081206B4
-	ldrb r1, [r0, #0xb]
-	lsls r1, r1, #2
-	adds r1, r1, r2
-	ldr r1, [r1]
-	bl _call_via_r1
-	pop {pc}
-	.align 2, 0
-_080866D4: .4byte gUnk_081206B4
-
-	thumb_func_start sub_080866D8
-sub_080866D8: @ 0x080866D8
-	push {r4, r5, r6, r7, lr}
-	mov r7, sb
-	mov r6, r8
-	push {r6, r7}
-	adds r6, r0, #0
-	ldrb r1, [r6, #0xc]
-	cmp r1, #0
-	bne _080866FE
-	movs r0, #1
-	strb r0, [r6, #0xc]
-	str r1, [r6, #0x68]
-	ldrb r1, [r6, #0xe]
-	adds r0, r6, #0
-	adds r0, #0x6c
-	strb r1, [r0]
-	adds r0, r6, #0
-	movs r1, #6
-	bl sub_0805E3A0
-_080866FE:
-	adds r0, r6, #0
-	adds r0, #0x6c
-	ldrb r0, [r0]
-	bl GetCurrentRoomProperty
-	adds r5, r0, #0
-	movs r0, #0
-	mov r8, r0
-	ldrh r0, [r5]
-	ldr r1, _080867C4 @ =0x0000FFFF
-	cmp r0, r1
-	beq _080867BA
-	mov sb, r1
-_08086718:
-	movs r7, #1
-	mov r1, r8
-	lsls r7, r1
-	ldr r0, [r6, #0x68]
-	ands r0, r7
-	cmp r0, #0
-	bne _080867A8
-	ldrb r0, [r5, #5]
-	bl sub_080867CC
-	cmp r0, #0
-	beq _080867A8
-	ldrh r0, [r5]
-	ldrh r1, [r5, #2]
-	movs r2, #0x20
-	movs r3, #0x20
-	bl sub_080562CC
-	cmp r0, #0
-	beq _080867A8
-	ldrb r1, [r5, #7]
-	ldrb r2, [r5, #6]
-	movs r0, #0x19
-	bl CreateObject
-	adds r4, r0, #0
-	cmp r4, #0
-	beq _080867A8
-	adds r0, #0x6c
-	mov r2, r8
-	strb r2, [r0]
-	ldr r1, _080867C8 @ =gRoomControls
-	ldrh r0, [r5]
-	ldrh r2, [r1, #6]
-	adds r0, r0, r2
-	adds r0, #0x10
-	strh r0, [r4, #0x2e]
-	ldrh r0, [r5, #2]
-	ldrh r1, [r1, #8]
-	adds r0, r0, r1
-	adds r0, #0x20
-	strh r0, [r4, #0x32]
-	str r6, [r4, #0x50]
-	ldrh r1, [r5]
-	adds r0, r4, #0
-	adds r0, #0x68
-	strh r1, [r0]
-	ldrh r0, [r5, #2]
-	adds r1, r4, #0
-	adds r1, #0x6a
-	strh r0, [r1]
-	ldrb r1, [r5, #4]
-	adds r0, r4, #0
-	adds r0, #0x38
-	strb r1, [r0]
-	ldrb r0, [r5, #5]
-	strb r0, [r4, #0xd]
-	adds r0, r4, #0
-	bl UpdateSpriteForCollisionLayer
-	ldr r0, [r6, #0x68]
-	orrs r0, r7
-	str r0, [r6, #0x68]
-	ldr r1, [r5, #8]
-	cmp r1, #0
-	beq _080867A8
-	adds r0, r4, #0
-	bl StartCutscene
-	adds r1, r4, #0
-	adds r1, #0x84
-	str r0, [r1]
-_080867A8:
-	adds r5, #0xc
-	movs r0, #1
-	add r8, r0
-	ldrh r0, [r5]
-	cmp r0, sb
-	beq _080867BA
-	mov r1, r8
-	cmp r1, #0x1f
-	bls _08086718
-_080867BA:
-	pop {r3, r4}
-	mov r8, r3
-	mov sb, r4
-	pop {r4, r5, r6, r7, pc}
-	.align 2, 0
-_080867C4: .4byte 0x0000FFFF
-_080867C8: .4byte gRoomControls
-
-	thumb_func_start sub_080867CC
-sub_080867CC: @ 0x080867CC
-	push {lr}
-	cmp r0, #0
-	beq _080867DE
-	cmp r0, #2
-	bne _080867DE
-	movs r0, #0x18
-	bl CheckGlobalFlag
-	b _080867E0
-_080867DE:
-	movs r0, #1
-_080867E0:
-	pop {pc}
-	.align 2, 0
-
-	thumb_func_start sub_080867E4
-sub_080867E4: @ 0x080867E4
-	push {r4, lr}
-	adds r4, r0, #0
-	adds r0, #0x68
-	ldrh r0, [r0]
-	adds r1, r4, #0
-	adds r1, #0x6a
-	ldrh r1, [r1]
-	movs r2, #0x20
-	movs r3, #0x20
-	bl sub_080562CC
-	cmp r0, #0
-	bne _08086814
-	ldr r2, [r4, #0x50]
-	adds r0, r4, #0
-	adds r0, #0x6c
-	movs r1, #1
-	ldrb r0, [r0]
-	lsls r1, r0
-	ldr r0, [r2, #0x68]
-	bics r0, r1
-	str r0, [r2, #0x68]
-	bl DeleteThisEntity
-_08086814:
-	adds r0, r4, #0
-	bl sub_0808681C
-	pop {r4, pc}
-
-	thumb_func_start sub_0808681C
-sub_0808681C: @ 0x0808681C
-	push {r4, r5, lr}
-	adds r5, r0, #0
-	ldrb r4, [r5, #0xc]
-	cmp r4, #0
-	beq _0808682C
-	cmp r4, #1
-	beq _08086868
-	b _0808688C
-_0808682C:
-	movs r2, #1
-	movs r0, #1
-	strb r0, [r5, #0xc]
-	movs r0, #8
-	strb r0, [r5, #0xe]
-	ldrb r1, [r5, #0x18]
-	subs r0, #0xc
-	ands r0, r1
-	orrs r0, r2
-	strb r0, [r5, #0x18]
-	strb r4, [r5, #0x1e]
-	ldr r0, _08086864 @ =gUnk_081206AC
-	str r0, [r5, #0x48]
-	ldrb r1, [r5, #0xd]
-	cmp r1, #1
-	bne _08086852
-	movs r0, #2
-	strb r0, [r5, #0xc]
-	strb r1, [r5, #0x1e]
-_08086852:
-	ldrb r1, [r5, #0x10]
-	movs r2, #2
-	adds r0, r2, #0
-	ands r0, r1
-	cmp r0, #0
-	beq _080868AA
-	strb r2, [r5, #0xc]
-	b _0808688C
-	.align 2, 0
-_08086864: .4byte gUnk_081206AC
-_08086868:
-	adds r0, r5, #0
-	bl sub_08086954
-	lsls r0, r0, #0x18
-	cmp r0, #0
-	bne _0808688C
-	ldrb r0, [r5, #0xc]
-	adds r0, #1
-	strb r0, [r5, #0xc]
-	strb r4, [r5, #0x1e]
-	movs r0, #0x10
-	movs r1, #0
-	movs r2, #1
-	bl sub_08078AC0
-	ldr r0, _080868AC @ =0x00000111
-	bl PlaySFX
-_0808688C:
-	ldrb r1, [r5, #0x10]
-	movs r0, #2
-	ands r0, r1
-	cmp r0, #0
-	beq _080868AA
-	adds r4, r5, #0
-	adds r4, #0x84
-	ldr r1, [r4]
-	adds r0, r5, #0
-	bl ExecuteScriptCommandSet
-	ldr r1, [r4]
-	adds r0, r5, #0
-	bl sub_080868EC
-_080868AA:
-	pop {r4, r5, pc}
-	.align 2, 0
-_080868AC: .4byte 0x00000111
-
-	thumb_func_start sub_080868B0
-sub_080868B0: @ 0x080868B0
-	push {r4, r5, lr}
-	adds r5, r0, #0
-	ldrb r0, [r5, #0xc]
-	cmp r0, #0
-	bne _080868D2
-	movs r2, #1
-	movs r0, #1
-	strb r0, [r5, #0xc]
-	ldrb r1, [r5, #0x18]
-	subs r0, #5
-	ands r0, r1
-	orrs r0, r2
-	strb r0, [r5, #0x18]
-	ldr r0, _080868E8 @ =gUnk_081206AC
-	str r0, [r5, #0x48]
-	movs r0, #8
-	strb r0, [r5, #0xe]
-_080868D2:
-	adds r4, r5, #0
-	adds r4, #0x84
-	ldr r1, [r4]
-	adds r0, r5, #0
-	bl ExecuteScriptCommandSet
-	ldr r1, [r4]
-	adds r0, r5, #0
-	bl sub_080868EC
-	pop {r4, r5, pc}
-	.align 2, 0
-_080868E8: .4byte gUnk_081206AC
-
-	thumb_func_start sub_080868EC
-sub_080868EC: @ 0x080868EC
-	push {r4, r5, lr}
-	adds r3, r0, #0
-	ldr r2, [r1, #8]
-	movs r0, #0
-	str r0, [r1, #8]
-	cmp r2, #0
-	beq _0808691E
-	movs r5, #0x80
-	lsls r5, r5, #1
-	movs r4, #0
-	movs r1, #1
-_08086902:
-	mvns r0, r2
-	adds r0, #1
-	ands r0, r2
-	eors r2, r0
-	cmp r0, #0x80
-	beq _08086914
-	cmp r0, r5
-	beq _08086918
-	b _0808691A
-_08086914:
-	strb r4, [r3, #0x1e]
-	b _0808691A
-_08086918:
-	strb r1, [r3, #0x1e]
-_0808691A:
-	cmp r2, #0
-	bne _08086902
-_0808691E:
-	ldrb r0, [r3, #0x1e]
-	cmp r0, #0
-	bne _0808692A
-	adds r0, r3, #0
-	bl sub_0800445C
-_0808692A:
-	pop {r4, r5, pc}
-
-	thumb_func_start sub_0808692C
-sub_0808692C: @ 0x0808692C
-	push {lr}
-	adds r2, r0, #0
-	ldrb r1, [r2, #0x10]
-	movs r0, #0xfd
-	ands r0, r1
-	strb r0, [r2, #0x10]
-	movs r0, #2
-	strb r0, [r2, #0xb]
-	ldrb r0, [r2, #0x1e]
-	movs r1, #2
-	cmp r0, #0
-	bne _08086946
-	movs r1, #1
-_08086946:
-	strb r1, [r2, #0xc]
-	movs r0, #0
-	strb r0, [r2, #0xd]
-	movs r0, #8
-	strb r0, [r2, #0xe]
-	pop {pc}
-	.align 2, 0
-
-	thumb_func_start sub_08086954
-sub_08086954: @ 0x08086954
-	push {r4, lr}
-	adds r4, r0, #0
-	bl sub_0800445C
-	cmp r0, #0
-	beq _0808699C
-	adds r0, r4, #0
-	movs r1, #6
-	movs r2, #0x14
-	bl sub_0806ED9C
-	cmp r0, #0
-	blt _080869A0
-	ldr r0, _08086994 @ =gLinkEntity
-	ldrb r0, [r0, #0x14]
-	cmp r0, #0
-	bne _080869A0
-	ldr r2, _08086998 @ =gLinkState
-	adds r0, r2, #0
-	adds r0, #0x90
-	ldrh r1, [r0]
-	movs r0, #0x80
-	lsls r0, r0, #3
-	cmp r1, r0
-	bne _080869A0
-	ldrb r0, [r2, #2]
-	cmp r0, #0
-	bne _080869A0
-	ldrb r0, [r4, #0xe]
-	subs r0, #1
-	b _0808699E
-	.align 2, 0
-_08086994: .4byte gLinkEntity
-_08086998: .4byte gLinkState
-_0808699C:
-	movs r0, #8
-_0808699E:
-	strb r0, [r4, #0xe]
-_080869A0:
-	ldrb r0, [r4, #0xe]
-	pop {r4, pc}
-
-	thumb_func_start sub_080869A4
-sub_080869A4: @ 0x080869A4
-	push {r4, r5, lr}
-	adds r4, r0, #0
-	adds r5, r1, #0
-	movs r0, #0
-	str r0, [r5, #0x14]
-	adds r0, r4, #0
-	bl sub_08086954
-	lsls r0, r0, #0x18
-	cmp r0, #0
-	bne _080869C2
-	movs r0, #8
-	strb r0, [r4, #0xe]
-	movs r0, #1
-	str r0, [r5, #0x14]
-_080869C2:
-	pop {r4, r5, pc}
\ No newline at end of file
diff --git a/include/entity.h b/include/entity.h
index e717c9e1..03dd4772 100644
--- a/include/entity.h
+++ b/include/entity.h
@@ -26,7 +26,8 @@ typedef struct {
 } BoundingBox;
 
 typedef struct Entity {
-    /*0x00*/ u32* field_0x0;
+    /*0x00*/ u16 unk0;
+    /*0x02*/ u8 filler2[0x2];
     /*0x04*/ struct Entity* field_0x4;
     /*0x08*/ EntityType entityType;
     /*0x0c*/ u8 action;
diff --git a/include/functions.h b/include/functions.h
index 40ebac66..da093417 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -204,4 +204,5 @@ extern u32 sub_0800445C(Entity*);
 extern void sub_0807A108(void);
 extern void sub_0801766C(Entity*);
 extern void sub_08004168(Entity*);
+extern void ExecuteScriptCommandSet(Entity*, void *);
 #endif
\ No newline at end of file
diff --git a/linker.ld b/linker.ld
index f652d64f..2bec115f 100644
--- a/linker.ld
+++ b/linker.ld
@@ -692,7 +692,7 @@ SECTIONS {
 		asm/floatingPlatform.o(.text);
 		asm/object17.o(.text);
 		asm/evilSpirit.o(.text);
-		asm/houseDoorExterior.o(.text);
+		src/object/houseDoorExterior.o(.text);
 		src/object/object1A.o(.text);
 		src/object/greatFairy.o(.text);
 		asm/greatFairy.o(.text);
diff --git a/src/object/houseDoorExterior.c b/src/object/houseDoorExterior.c
new file mode 100755
index 00000000..c68f6b23
--- /dev/null
+++ b/src/object/houseDoorExterior.c
@@ -0,0 +1,187 @@
+#include "global.h"
+#include "entity.h"
+#include "flags.h"
+#include "functions.h"
+#include "room.h"
+
+typedef struct {
+    /*0x00*/ u16 unk0;
+    /*0x02*/ u16 unk2;
+    /*0x04*/ u8 unk4;
+    /*0x05*/ u8 unk5;
+    /*0x06*/ u8 unk6;
+    /*0x07*/ u8 unk7;
+    /*0x08*/ u8 *unk8;
+} unk_DoorProperty;
+
+typedef struct {
+    /*0x00*/ u8 filler0[0x8];
+    /*0x08*/ u32 unk8;
+} unk_80868EC;
+
+static void sub_080868EC(Entity* entity, unk_80868EC* arg1);
+static bool32 sub_080867CC(u32);
+static void sub_0808681C(Entity*);
+static u8 sub_08086954(Entity*);
+
+extern u32 sub_080562CC(u32, u32, u32, u32);
+extern void sub_08078AC0(u32, u32, u32);
+extern void* GetCurrentRoomProperty(u8);
+
+extern void (*const gUnk_081206B4[])(Entity*);
+extern BoundingBox gUnk_081206AC; // TODO: should be const
+
+void HouseDoorExterior(Entity* this) {
+    gUnk_081206B4[this->entityType.parameter](this);
+}
+
+void sub_080866D8(Entity* this) {
+    unk_DoorProperty* prop;
+    Entity* entity;
+    u32 i;
+
+    if (this->action == 0) {
+        this->action = 1;
+        *((u32 *)(&this->field_0x68)) = 0;
+        this->field_0x6c.HALF.LO = this->actionDelay;
+        sub_0805E3A0(this, 6);
+    }
+
+    prop = GetCurrentRoomProperty(this->field_0x6c.HALF.LO);
+    for (i = 0; prop->unk0 != 0xFFFF && i < 32; prop++, i++) {
+        int mask = 1 << i;
+        if ((*((u32 *)(&this->field_0x68)) & mask) == 0 &&
+            sub_080867CC(prop->unk5) &&
+            sub_080562CC(prop->unk0, prop->unk2, 32, 32)) {
+            entity = CreateObject(0x19, prop->unk7, prop->unk6);
+            if (entity) {
+                entity->field_0x6c.HALF.LO = i;
+                entity->x.HALF.HI = gRoomControls.roomOriginX + prop->unk0 + 16;
+                entity->y.HALF.HI = gRoomControls.roomOriginY + prop->unk2 + 32;
+                entity->parent = this;
+                entity->field_0x68.HWORD = prop->unk0;
+                entity->field_0x6a.HWORD = prop->unk2;
+                entity->collisionLayer = prop->unk4;
+                entity->previousActionFlag = prop->unk5;
+                UpdateSpriteForCollisionLayer(entity);
+                *((u32 *)(&this->field_0x68)) |= mask;
+                if (prop->unk8) {
+                    *((u32 **)(&entity->cutsceneBeh)) = StartCutscene(entity, prop->unk8);
+                }
+            }
+        }
+    }
+}
+
+static bool32 sub_080867CC(u32 arg0) {
+    if (arg0 == 0) {
+        return TRUE;
+    }
+    if (arg0 != 2) {
+        return TRUE;
+    }
+    return CheckGlobalFlag(TATEKAKE_HOUSE);
+}
+
+void sub_080867E4(Entity* this) {
+    if (!sub_080562CC(this->field_0x68.HWORD, this->field_0x6a.HWORD, 32, 32)) {
+        *((u32 *)(&this->parent->field_0x68)) = *((u32 *)(&this->parent->field_0x68)) & ~(1 << this->field_0x6c.HALF.LO);
+        DeleteThisEntity();
+    }
+    sub_0808681C(this);
+}
+
+static void sub_0808681C(Entity* this) {
+    switch (this->action) {
+        case 0:
+            this->action = 1;
+            this->actionDelay = 8;
+            this->spriteSettings.b.draw = 1;
+            this->frameIndex = 0;
+            this->boundingBox = &gUnk_081206AC;
+            if (this->previousActionFlag == 1) {
+                this->action = 2;
+                this->frameIndex = 1;
+            }
+            if (this->flags & 0x2) {
+                this->action = 2;
+            }
+            break;
+        case 1:
+            if (!sub_08086954(this)) {
+                this->action++;
+                this->frameIndex = 1;
+                sub_08078AC0(16, 0, 1);
+                PlaySFX(0x111);
+            }
+            break;
+    }
+
+    if (this->flags & 0x2) {
+        ExecuteScriptCommandSet(this, *(u32 **)&this->cutsceneBeh);
+        sub_080868EC(this, *(void **)&this->cutsceneBeh);
+    }
+}
+
+void sub_080868B0(Entity* this) {
+    if (this->action == 0) {
+        this->action = 1;
+        this->spriteSettings.b.draw = 1;
+        this->boundingBox = &gUnk_081206AC;
+        this->actionDelay = 8;
+    }
+    ExecuteScriptCommandSet(this, *(u32 **)&this->cutsceneBeh);
+    sub_080868EC(this, *(void **)&this->cutsceneBeh);
+}
+
+static void sub_080868EC(Entity* entity, unk_80868EC* arg1) {
+    u32 var0 = arg1->unk8;
+    arg1->unk8 = 0;
+    while (var0 != 0) {
+        u32 rightMostSetBit = var0 & (~var0 + 1);
+        var0 ^= rightMostSetBit;
+        switch (rightMostSetBit) {
+            case 0x80:
+                entity->frameIndex = 0;
+                break;
+            case 0x100:
+                entity->frameIndex = 1;
+                break;
+        }
+    }
+
+    if (entity->frameIndex == 0) {
+        sub_0800445C(entity);
+    }
+}
+
+void sub_0808692C(Entity* this) {
+    this->flags &= 0xFD;
+    this->entityType.parameter = 2;
+    this->action = this->frameIndex == 0 ? 1 : 2;
+    this->previousActionFlag = 0;
+    this->actionDelay = 8;
+}
+
+static u8 sub_08086954(Entity* this) {
+    if (sub_0800445C(this)) {
+        if (sub_0806ED9C(this, 6, 20) >= 0 &&
+            gLinkEntity.animationState == 0 &&
+            (u16)gLinkState.field_0x90.HALF.LO == 0x400 &&
+            gLinkState.jumpStatus == 0) {
+            this->actionDelay--;
+        }
+    } else {
+        this->actionDelay = 8;
+    }
+    return this->actionDelay;
+}
+
+// TODO: Second arg is some unknown struct.
+void sub_080869A4(Entity* entityA, u32* entityB) {
+    entityB[5] = 0;
+    if (!sub_08086954(entityA)) {
+        entityA->actionDelay = 8;
+        entityB[5] = 1;
+    }
+}