diff --git a/build_3d.gh b/build_3d.gh
index b36e3ce..d6155cb 100644
Binary files a/build_3d.gh and b/build_3d.gh differ
diff --git a/rhino_packages/build_3d.py b/rhino_packages/build_3d.py
new file mode 100644
index 0000000..48f50d7
--- /dev/null
+++ b/rhino_packages/build_3d.py
@@ -0,0 +1,173 @@
+import Rhino.Geometry as geo
+from .constants import *
+from .utils import set_clockwise, offset_closed_crv_inside, offset_closed_crv_outside, extrude_crv, brep_boolean_difference
+from typing import List, Optional, Tuple
+
+def make_door_from_open_curve(d_crv, height, thickness):
+    if not d_crv:
+        return None
+
+    offset1 = d_crv.Offset(geo.Plane.WorldXY,  thickness/2, 0.01, geo.CurveOffsetCornerStyle.Sharp)
+    offset2 = d_crv.Offset(geo.Plane.WorldXY, -thickness/2, 0.01, geo.CurveOffsetCornerStyle.Sharp)
+    if not offset1 or not offset2:
+        return None
+
+    c1, c2 = offset1[0], offset2[0]
+
+    # 양 끝 연결
+    side1 = geo.Line(c1.PointAtStart, c2.PointAtStart).ToNurbsCurve()
+    side2 = geo.Line(c1.PointAtEnd,   c2.PointAtEnd).ToNurbsCurve()
+
+    # 닫힌 경계
+    curves = [c1, side2, c2, side1]
+    joined = geo.Curve.JoinCurves(curves)
+    if not joined or len(joined) == 0:
+        return None
+
+    profile = joined[0]
+    if not profile.IsClosed:
+        return None
+
+    # Extrude (높이)
+    extrusion = geo.Extrusion.Create(profile, height, True)
+    if not extrusion:
+        raise ValueError("not door extrusion")
+    return extrusion.ToBrep()
+
+def make_window_from_open_curve(w_crv, thickness, height, height_from_bottom):
+    if not w_crv:
+        return None
+
+    # 1. Offset (양쪽)
+    offset1 = w_crv.Offset(geo.Plane.WorldXY,  thickness/2, 0.01, geo.CurveOffsetCornerStyle.Sharp)
+    offset2 = w_crv.Offset(geo.Plane.WorldXY, -thickness/2, 0.01, geo.CurveOffsetCornerStyle.Sharp)
+    if not offset1 or not offset2:
+        return None
+
+    c1, c2 = offset1[0], offset2[0]
+
+    # 2. 양 끝점 잇기
+    side1 = geo.Line(c1.PointAtStart, c2.PointAtStart).ToNurbsCurve()
+    side2 = geo.Line(c1.PointAtEnd,   c2.PointAtEnd).ToNurbsCurve()
+
+    # 3. 닫힌 경계 만들기
+    curves = [c1, side2, c2, side1]
+    joined = geo.Curve.JoinCurves(curves)
+    if not joined or len(joined) == 0:
+        return None
+
+    profile = joined[0]
+    if not profile.IsClosed:
+        return None
+
+    # 4. 창 하단 높이만큼 Z 방향으로 이동
+    move = geo.Transform.Translation(0, 0, height_from_bottom)
+    profile_dup = profile.DuplicateCurve()
+    profile_dup.Transform(move)
+
+    # 5. Extrude (창 높이)
+    extrusion = geo.Extrusion.Create(profile_dup, height, True)
+    if not extrusion:
+        raise ValueError("not window extrusion")
+    return extrusion.ToBrep()
+
+def get_room_wall(segs, thickness, height):
+    # type: (list[geo.Curve], float, float) -> geo.Brep
+    """
+    벽들의 단일 세그먼트로부터, 두께와 높이만큼 벽을 만든다.
+    """
+    segs = set_clockwise(segs)
+    # TODO: segs에 순서대로 내부 세그, 외부 세그 나오도록 설정
+    walls = [] # type: list[geo.Brep]
+
+    for seg in segs:
+        inner_offset = offset_closed_crv_inside(seg, thickness/2)
+        outer_offset = offset_closed_crv_outside(seg, thickness/2)
+
+        inner_extrude = extrude_crv(inner_offset, height)
+        outer_extrude = extrude_crv(outer_offset, height)
+
+        wall = brep_boolean_difference(outer_extrude, inner_extrude)
+        walls.append(wall)
+    wall_unions = geo.Brep.CreateBooleanUnion(walls, 0.01)
+
+    if len(wall_unions) > 1:
+        raise ValueError("벽이 연결되어 있지 않습니다.")
+    wall_union = wall_unions[0]
+    return wall_union
+        
+def get_doors(segs, thickness, height):
+    # type: (list[geo.Curve], float, float) -> list[geo.Brep]
+    """
+    문들의 단일 세그먼트로부터, 두께와 높이만큼 문을 만든다.
+    """
+    doors = [] # type: list[geo.Brep]
+    for seg in segs:
+        door = make_door_from_open_curve(seg, thickness, height)
+        doors.append(door)
+
+def get_windows(segs, thickness, height, height_from_bottom):
+    # type: (list[geo.Curve], float, float, float) -> list[geo.Brep]
+    """
+    창문들의 세그먼트로부터, 바닥의 높이에서 창문의 높이, 두께만큼 만든다.
+    """
+    windows = [] # type: list[geo.Brep]
+    for seg in segs:
+        window = make_window_from_open_curve(seg, thickness, height, height_from_bottom)
+        windows.append(window)
+    return windows
+
+def get_bottom_slab(wall_region, thickness):
+    # type: (geo.Curve, float) -> geo.Brep
+    """
+    천장 슬래브
+    """
+    outside_offset_crv = offset_closed_crv_outside(wall_region, thickness/2)
+    extrusion = geo.Extrusion.Create(outside_offset_crv, -thickness, True)
+    if not extrusion:
+        raise ValueError("not bottom extrusion")
+    return extrusion.ToBrep()
+
+def get_top_slab(wall_region, thickness, wall_height):
+    # type: (geo.Curve, float, float) -> geo.Brep
+    """
+    바닥 슬래브
+    """
+    outside_offset_crv = offset_closed_crv_outside(wall_region, thickness/2)
+    base = outside_offset_crv.DuplicateCurve()
+    move = geo.Transform.Translation(0, 0, wall_height)  # 벽 높이만큼 위로 이동
+    base.Transform(move)
+
+    extrusion = geo.Extrusion.Create(base, thickness, True)
+    if not extrusion:
+        raise ValueError("not top extrusion")
+    return extrusion.ToBrep()
+
+def build(wall_regions, door_segs, window_segs):
+    # type: (list[geo.Curve], list[geo.Curve], list[geo.Curve]) -> tuple[list[geo.Brep], list[geo.Brep], list[geo.Brep]]
+    """
+    문과 창문을 제외한 벽체를 생성한다.
+    """
+
+    wall = get_room_wall(wall_regions, wall_thickness, wall_height)
+    doors = get_doors(door_segs, 300, 3000)
+    windows = get_windows(window_segs, wall_thickness, window_height, window_height_from_bottom)
+
+    print(doors)
+    print(windows)
+
+    if not doors:
+        doors = []
+    if not windows:
+        windows = []
+
+    cutters = doors + windows
+    refined_wall = geo.Brep.CreateBooleanDifference([wall], cutters, TOL)
+
+    bottom_slabs = [get_bottom_slab(wr, slab_thickness) for wr in wall_regions]
+    top_slabs = [get_top_slab(wr, slab_thickness, wall_height) for wr in wall_regions]
+
+    bottom_slab = geo.Brep.CreateBooleanUnion(bottom_slabs, 0.01)
+    top_slab = geo.Brep.CreateBooleanUnion(top_slabs, 0.01)
+
+    return refined_wall, bottom_slab, top_slab
\ No newline at end of file
diff --git a/rhino_packages/constants.py b/rhino_packages/constants.py
new file mode 100644
index 0000000..220316c
--- /dev/null
+++ b/rhino_packages/constants.py
@@ -0,0 +1,13 @@
+TOL = 0.01
+
+# 벽 두께, 벽 높이
+wall_thickness = 200
+wall_height = 3000
+
+# 바닥에서 창문까지 높이
+window_height_from_bottom = 500
+# 창문 높이
+window_height = 500
+
+# 슬래브 두께
+slab_thickness = 300
\ No newline at end of file
diff --git a/rhino_packages/parsing.py b/rhino_packages/parsing.py
new file mode 100644
index 0000000..90c626e
--- /dev/null
+++ b/rhino_packages/parsing.py
@@ -0,0 +1,86 @@
+import Rhino.Geometry as geo
+from typing import Union, Optional, List, Dict, Any
+
+
+class JsonToGeometry:
+    """
+    JSON 구조(rooms, doors, windows)를 받아
+    Rhino.Geometry Curve 객체로 변환하는 클래스
+    """
+
+    def __init__(self, data: Dict[str, Any]):
+        self.data = data
+        self.rooms: Dict[str, geo.Curve] = {}
+        self.doors: List[geo.Curve] = []
+        self.windows: List[geo.Curve] = []
+        self._parse_all()
+
+    # --- 내부 유틸 ---
+    def _parse_coords(self, coord_str: str) -> List[geo.Point3d]:
+        pts: List[geo.Point3d] = []
+        for c in coord_str.split(","):
+            nums = list(map(float, c.strip().split()))
+            if len(nums) == 2:  # x, y만 있는 경우 → z=0
+                x, y = nums
+                pts.append(geo.Point3d(x, y, 0.0))
+            elif len(nums) == 3:
+                x, y, z = nums
+                pts.append(geo.Point3d(x, y, z))
+            else:
+                raise ValueError(f"좌표 포맷 오류: {nums}")
+        return pts
+
+    def parse_polygon(self, wkt: str) -> geo.Curve:
+        coords = wkt.replace("POLYGON ((", "").replace("))", "")
+        pts = self._parse_coords(coords)
+        return geo.Polyline(pts).ToPolylineCurve()
+
+    def parse_linestring(self, wkt: str) -> geo.Curve:
+        coords = wkt.replace("LINESTRING (", "").replace(")", "")
+        pts = self._parse_coords(coords)
+        if len(pts) == 2:
+            return geo.Line(pts[0], pts[1]).ToNurbsCurve()
+        return geo.Polyline(pts).ToPolylineCurve()
+
+    def parse_point(self, wkt: str) -> geo.Point3d:
+        coord = wkt.replace("POINT (", "").replace(")", "")
+        nums = list(map(float, coord.strip().split()))
+        if len(nums) == 2:
+            x, y = nums
+            return geo.Point3d(x, y, 0.0)
+        elif len(nums) == 3:
+            x, y, z = nums
+            return geo.Point3d(x, y, z)
+        else:
+            raise ValueError(f"좌표 포맷 오류: {nums}")
+
+    def parse(self, wkt: str) -> Optional[Union[geo.Curve, geo.Point3d]]:
+        if wkt.startswith("POLYGON"):
+            return self.parse_polygon(wkt)
+        elif wkt.startswith("LINESTRING"):
+            return self.parse_linestring(wkt)
+        elif wkt.startswith("POINT"):
+            return self.parse_point(wkt)
+        return None
+
+    # --- 메인 파서 ---
+    def _parse_all(self) -> None:
+        """JSON 구조 전체 파싱"""
+        # rooms
+        for r in self.data.get("rooms", []):
+            geom = self.parse(r["geom"])
+            if isinstance(geom, geo.Curve):
+                self.rooms[r["room_name"]] = geom
+
+        # doors
+        for d in self.data.get("doors", []):
+            geom = self.parse(d["geom"])
+            if isinstance(geom, geo.Curve):
+                self.doors.append(geom)
+
+        # windows
+        for w in self.data.get("windows", []):
+            geom = self.parse(w["geom"])
+            if isinstance(geom, geo.Curve):
+                self.windows.append(geom)
+
diff --git a/rhino_packages/utils.py b/rhino_packages/utils.py
new file mode 100644
index 0000000..f67b37e
--- /dev/null
+++ b/rhino_packages/utils.py
@@ -0,0 +1,73 @@
+import Rhino.Geometry as geo
+
+def set_clockwise(crvs):
+    update_crvs = [] # type: list[geo.Curve]
+    for crv in crvs:
+        orientation = crv.ClosedCurveOrientation(geo.Plane.WorldXY)
+        if orientation == geo.CurveOrientation.CounterClockwise:
+            update_crvs.append(crv)
+        else:
+            crv.Reverse()
+            update_crvs.append(crv)
+    return update_crvs
+
+def is_crv_clockwise(crv):
+    orientation = crv.ClosedCurveOrientation(geo.Plane.WorldXY)
+    if orientation == geo.CurveOrientation.CounterClockwise:
+        return True
+    elif orientation == geo.CurveOrientation.Clockwise:
+        return False
+    else:
+        return None
+
+def _try_get_plane(crv):
+    plane = geo.Plane.Unset
+
+    ok, plane = crv.TryGetPlane()
+    return (ok, plane)
+
+def offset_closed_crv_inside(crv, dist):
+    ok, plane = _try_get_plane(crv)
+    if not ok or not crv.IsClosed:
+        return None
+    if is_crv_clockwise(crv):
+        dist = -dist
+    segs = crv.Offset(plane, dist, 0.01, geo.CurveOffsetCornerStyle.Sharp)
+    if not segs: return None
+    joined = geo.Curve.JoinCurves(segs, 0.01)
+    if len(joined) != 1: return None
+    return joined[0]
+
+def offset_closed_crv_outside(crv, dist):
+
+    ok, plane = _try_get_plane(crv)
+    if not ok or not crv.IsClosed:
+        return None
+    if not is_crv_clockwise(crv):
+        dist = -dist
+    segs = crv.Offset(plane, dist, 0.01, geo.CurveOffsetCornerStyle.Sharp)
+    if not segs: return None
+    joined = geo.Curve.JoinCurves(segs, 0.01)
+    if len(joined) != 1: return None
+    return joined[0]
+
+def extrude_crv(crv, height):
+    if not crv: return None
+    ext = geo.Extrusion.Create(crv, height, True)
+    return ext.ToBrep() if ext else None
+
+def brep_boolean_difference(base_brep, cutter_brep):
+    if not base_brep or not cutter_brep:
+        return None
+    if isinstance(base_brep, list) and len(base_brep) > 0:
+        base_brep = base_brep[0]
+    if isinstance(cutter_brep, list) and len(cutter_brep) > 0:
+        cutter_brep = cutter_brep[0]
+    try:
+        tol = Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance
+    except:
+        tol = 1e-3
+    result = geo.Brep.CreateBooleanDifference(base_brep, cutter_brep, tol)
+    if result and len(result) > 0:
+        return result[0]
+    return None
\ No newline at end of file