diff --git a/src/util/skeleton-utils.js b/src/util/skeleton-utils.js
index 7d6b1b23..6a3c567e 100644
--- a/src/util/skeleton-utils.js
+++ b/src/util/skeleton-utils.js
@@ -394,79 +394,81 @@ export const skeletonBuilder = (roofId, canvas, textMode) => {
   const isClosedPolygon = (points) =>
     points.length > 1 && isSamePoint(points[0], points[points.length - 1])
 
-  const roofLinePoints = isClosedPolygon(roof.points) ? roof.points.slice(0, -1) : roof.points
   const orderedBaseLinePoints = isClosedPolygon(baseLinePoints) ? baseLinePoints.slice(0, -1) : baseLinePoints
 
-  console.log('roofLinePoints:', roofLinePoints)
-  console.log('baseLinePoints:', orderedBaseLinePoints)
-
-  // baseLinePoint에서 roofLinePoint 방향으로 45도 대각선 확장 후 가장 가까운 접점 계산
-  // 각 포인트의 dx, dy, sign 정보 수집
-  const contactData = orderedBaseLinePoints.map((point, index) => {
-    const roofPoint = roofLinePoints[index]
-    if (!roofPoint) return { dx: 0, dy: 0, signDx: 0, signDy: 0 }
-
-    const dx = roofPoint.x - point.x
-    const dy = roofPoint.y - point.y
-    return { dx, dy, signDx: Math.sign(dx), signDy: Math.sign(dy) }
-  })
-
-  // maxStep: 모든 포인트 중 가장 큰 45도 step
-  const maxStep = contactData.reduce((max, data) => {
-    return Math.max(max, Math.min(Math.abs(data.dx), Math.abs(data.dy)))
-  }, 0)
-
-  // baseLine 폴리곤의 중심 계산 (확장 방향 결정용)
+  // baseLine 폴리곤의 중심 계산 (offset 방향 결정용)
   const centroid = orderedBaseLinePoints.reduce((acc, p) => {
     acc.x += p.x / orderedBaseLinePoints.length
     acc.y += p.y / orderedBaseLinePoints.length
     return acc
   }, { x: 0, y: 0 })
 
-  // 모든 포인트를 동일한 maxStep으로 45도 확장
-  let roofLineContactPoints = orderedBaseLinePoints.map((point, index) => {
-    const data = contactData[index]
-    const { dx, dy } = data
-
-    // dx 또는 dy가 0인 경우 중심에서 바깥쪽 방향으로 확장
-    let signDx = data.signDx
-    let signDy = data.signDy
-    if (signDx === 0) {
-      signDx = point.x >= centroid.x ? 1 : -1
-    }
-    if (signDy === 0) {
-      signDy = point.y >= centroid.y ? 1 : -1
-    }
-
+  // baseLine을 offset만큼 바깥으로 평행이동
+  const offsetLine = (line) => {
+    const sp = line.startPoint, ep = line.endPoint
+    const offset = line.attributes?.offset ?? 0
+    const edx = ep.x - sp.x, edy = ep.y - sp.y
+    const len = Math.hypot(edx, edy)
+    if (len === 0) return { sp: { ...sp }, ep: { ...ep } }
+    let nx = -edy / len, ny = edx / len
+    const mid = { x: (sp.x + ep.x) / 2, y: (sp.y + ep.y) / 2 }
+    if (nx * (centroid.x - mid.x) + ny * (centroid.y - mid.y) > 0) { nx = -nx; ny = -ny }
     return {
-      x: point.x + signDx * maxStep,
-      y: point.y + signDy * maxStep
+      sp: { x: sp.x + nx * offset, y: sp.y + ny * offset },
+      ep: { x: ep.x + nx * offset, y: ep.y + ny * offset }
     }
+  }
+
+  // 두 직선의 교차점
+  const lineIntersect = (a1, a2, b1, b2) => {
+    const denom = (a1.x - a2.x) * (b1.y - b2.y) - (a1.y - a2.y) * (b1.x - b2.x)
+    if (Math.abs(denom) < 0.001) return null
+    const t = ((a1.x - b1.x) * (b1.y - b2.y) - (a1.y - b1.y) * (b1.x - b2.x)) / denom
+    return { x: a1.x + t * (a2.x - a1.x), y: a1.y + t * (a2.y - a1.y) }
+  }
+
+  // 각 꼭짓점에서 인접 두 baseLine의 offset 교차점으로 확장 좌표 계산
+  let changRoofLinePoints = orderedBaseLinePoints.map((point) => {
+    const adjLines = baseLines.filter(line =>
+      isSamePoint(point, line.startPoint) || isSamePoint(point, line.endPoint)
+    )
+    if (adjLines.length < 2) return { ...point }
+    const oL1 = offsetLine(adjLines[0]), oL2 = offsetLine(adjLines[1])
+    return lineIntersect(oL1.sp, oL1.ep, oL2.sp, oL2.ep) || { ...point }
   })
 
-  const maxContactDistance = Math.hypot(maxStep, maxStep)
-
-  let changRoofLinePoints = orderedBaseLinePoints.map((point, index) => {
-    const contactPoint = roofLineContactPoints[index]
-    if (!contactPoint) return point
-
-    const dx = contactPoint.x - point.x
-    const dy = contactPoint.y - point.y
-    const len = Math.hypot(dx, dy)
-
-    // 거리가 0이면 이미 같은 위치
-    if (len === 0) return point
-
-    const step = maxContactDistance
-    if (step === 0) return point
-
-    const nextX = point.x + (dx / len) * step
-    const nextY = point.y + (dy / len) * step
-    return {
-      x: nextX,
-      y: nextY
+  // 중복 좌표 및 일직선 위의 불필요한 점 제거 (L자 확장 시 사각형으로 단순화)
+  const simplifyPolygon = (pts) => {
+    let result = [...pts]
+    let changed = true
+    while (changed) {
+      changed = false
+      for (let i = result.length - 1; i >= 0; i--) {
+        const next = result[(i + 1) % result.length]
+        if (Math.abs(result[i].x - next.x) < 0.5 && Math.abs(result[i].y - next.y) < 0.5) {
+          result.splice(i, 1)
+          changed = true
+        }
+      }
+      for (let i = result.length - 1; i >= 0 && result.length > 3; i--) {
+        const prev = result[(i - 1 + result.length) % result.length]
+        const curr = result[i]
+        const next = result[(i + 1) % result.length]
+        const cross = (curr.x - prev.x) * (next.y - prev.y) - (curr.y - prev.y) * (next.x - prev.x)
+        if (Math.abs(cross) < 1) {
+          result.splice(i, 1)
+          changed = true
+        }
+      }
     }
-  })
+    return result
+  }
+  changRoofLinePoints = simplifyPolygon(changRoofLinePoints)
+
+  let roofLineContactPoints = [...changRoofLinePoints]
+
+  console.log('baseLinePoints:', orderedBaseLinePoints)
+  console.log('changRoofLinePoints:', changRoofLinePoints)
 
   //마루이동
   if (moveFlowLine !== 0 || moveUpDown !== 0) {
@@ -489,7 +491,7 @@ export const skeletonBuilder = (roofId, canvas, textMode) => {
     // 스켈레톤 데이터를 기반으로 내부선 생성
     roof.innerLines = roof.innerLines || []
     roof.innerLines = createInnerLinesFromSkeleton(roofId, canvas, skeleton, textMode)
-    //console.log("roofInnerLines:::", roof.innerLines);
+    console.log("roofInnerLines:::", roof.innerLines);
     // 캔버스에 스켈레톤 상태 저장
     if (!canvas.skeletonStates) {
       canvas.skeletonStates = {}