diff --git a/addons/yt_world/models/yt_world_build_item.py b/addons/yt_world/models/yt_world_build_item.py
index 4024e75..26481ba 100644
--- a/addons/yt_world/models/yt_world_build_item.py
+++ b/addons/yt_world/models/yt_world_build_item.py
@@ -63,7 +63,7 @@ class YtWorldBuildItem(models.Model):
     # 设计最大等级（随素材制作进度迭代；由 data/yt_world_build_item_updates.xml 的
     # <function> 在每次模块升级时刷新——noupdate 记录无法用普通 record 覆盖）
     DESIGN_MAX_LEVELS = {
-        'cottage': 2,   # L2 素材已上线
+        'cottage': 4,   # L4 素材已上线（米白灰泥墙+青灰石板瓦+金饰升级外观）
     }
 
     @api.model
diff --git a/assets/buildings/spring/cottage/cottage_l3_l.png b/assets/buildings/spring/cottage/cottage_l3_l.png
new file mode 100644
index 0000000..2bc6204
Binary files /dev/null and b/assets/buildings/spring/cottage/cottage_l3_l.png differ
diff --git a/assets/buildings/spring/cottage/cottage_l3_r.png b/assets/buildings/spring/cottage/cottage_l3_r.png
new file mode 100644
index 0000000..481c546
Binary files /dev/null and b/assets/buildings/spring/cottage/cottage_l3_r.png differ
diff --git a/assets/buildings/spring/cottage/cottage_l4_l.png b/assets/buildings/spring/cottage/cottage_l4_l.png
new file mode 100644
index 0000000..2a8199d
Binary files /dev/null and b/assets/buildings/spring/cottage/cottage_l4_l.png differ
diff --git a/assets/buildings/spring/cottage/cottage_l4_r.png b/assets/buildings/spring/cottage/cottage_l4_r.png
new file mode 100644
index 0000000..e472fc9
Binary files /dev/null and b/assets/buildings/spring/cottage/cottage_l4_r.png differ
diff --git a/world.html b/world.html
index 6f44414..6af0223 100644
--- a/world.html
+++ b/world.html
@@ -2688,7 +2688,7 @@ const MICRO_BUILD_ITEMS = [
 // 建筑 / 设施 目录（兜底：未登录或 Odoo 未提供时直接用此；登录后由 /yt_world/api/micro/catalog 覆盖）。
 // flat=true 表示平面俯视，岛上压成菱形贴地；否则为 3/4 立绘，竖直站立。
 const MICRO_BUILD_EXTRA = [
-  { id: 'cottage',     cat: 'build', icon: 'assets/buildings/spring/cottage/cottage_l.png?v=6', levels: { 2: 'assets/buildings/spring/cottage/cottage_l2_l.png?v=1' }, name: '农舍', desc: '村民起居的基本居所，提供人口上限与夜间休息。', flat: false, w: 2, h: 2, statLevel: 1, statHp: 120, statYield: { population: 4 }, costGold: 20 },
+  { id: 'cottage',     cat: 'build', icon: 'assets/buildings/spring/cottage/cottage_l.png?v=6', levels: { 2: 'assets/buildings/spring/cottage/cottage_l2_l.png?v=1', 3: 'assets/buildings/spring/cottage/cottage_l3_l.png?v=1', 4: 'assets/buildings/spring/cottage/cottage_l4_l.png?v=1' }, name: '农舍', desc: '村民起居的基本居所，提供人口上限与夜间休息。', flat: false, w: 2, h: 2, statLevel: 1, statHp: 120, statYield: { population: 4 }, costGold: 20 },
   { id: 'windmill',    cat: 'build', icon: 'assets/buildings/spring/windmill/windmill_l.png?v=5',   name: '风车', desc: '利用风力磨粉与提水，提升粮食加工效率。',       flat: false, w: 3, h: 3, statLevel: 1, statHp: 110, statYield: { flour: 2 }, costGold: 60 },
   { id: 'blacksmith',  cat: 'build', icon: 'assets/buildings/spring/blacksmith/blacksmith_l.png?v=5',name: '铁匠铺', desc: '锻造工具与武器，产出金属制品。',           flat: false, w: 2, h: 2, statLevel: 1, statHp: 130, statYield: { metal: 2 }, costGold: 80 },
   { id: 'grocery',     cat: 'build', icon: 'assets/buildings/spring/grocery/grocery_l.png?v=5',      name: '杂货铺', desc: '交易日用物资的小型商铺，促进经济流通。',   flat: false, w: 2, h: 2, statLevel: 1, statHp: 90,  statYield: { coin: 2 }, costGold: 50 },
@@ -3667,7 +3667,14 @@ function microDrawPlaced(ctx, b, it, cell, ew, eh) {
   const isRoad = it && it.cat === 'road';
   const flat = !!(it && it.flat);
   const rot = (b && b.rot) || 0;
-  const lvl = (b && b.level) ? b.level : 1;
+  // 升级外观切换时序：数据等级(b.level)落库后立即更新，但画布"视觉等级"延迟到
+  // 升级特效进入 complete 阶段才切换（UF.phase==='complete' 时按 UF.toLevel），
+  // 实现"先播升级动画、动画完成外观才变"。未就绪(visualLevel 为 null)时保持旧外观，
+  // 无特效(UF 为空)/已结束则直接用真实等级——避免异常分支卡在旧图。
+  let lvl;
+  if (b && b.visualLevel != null) lvl = b.visualLevel;
+  else if (UF && UF.building === b && UF.phase === 'complete' && UF.toLevel) lvl = UF.toLevel;
+  else lvl = (b && b.level) ? b.level : 1;
   const lvlIcon = (it && it.levels && it.levels[lvl]) ? it.levels[lvl] : null;
   const baseIcon = (b && b.sub) || lvlIcon || (it && it.icon);
   const icon = (!isRoad && !flat) ? microIconForRot(baseIcon, rot) : baseIcon;
@@ -6547,6 +6554,8 @@ function _ufPushRings(uf, n) {
 }
 function _ufEnterComplete(uf) {
   uf.phase = 'complete'; uf.t0 = _ufNow();
+  // 升级动画进入"完成"这一刻：才把建筑视觉等级切到目标等级 → 外观此时才变
+  if (uf.building) uf.building.visualLevel = uf.toLevel;
   uf.floats.push({ kind: 'level', text: 'Lv.' + uf.toLevel, color: '#ffffff', t0: _ufNow(), life: UPGRADE_FX.durations.complete, vy: -0.022 });
   if (uf.reward) uf.floats.push({ kind: 'reward', text: uf.reward, color: UPGRADE_FX.colors.reward, t0: _ufNow(), life: UPGRADE_FX.durations.complete + 220, vy: -0.04 });
   if (!_ufLowEnd()) _ufSpawnParticles(uf, UPGRADE_FX.particleCount, false);
@@ -6802,6 +6811,10 @@ async function microBuildingAct(type, action, label) {
     const _was = microOpenBuilding.level;
     microOpenBuilding.level = res.level;
     microOpenBuilding.exp = res.exp;
+    // 视觉等级延迟切换：数据已落库升级，但画布外观先保持旧等级，
+    // 等升级特效进入 complete 阶段（microUpgradeFxDraw 自动推进）才换上新外观。
+    // 特效被关闭(UF 为空)时无法承载动画，直接切到新等级降级为旧行为（不卡旧图）。
+    microOpenBuilding.visualLevel = (UF ? _was : res.level);
     // 升级即时换肤：主动确保新等级贴图（含左右视角）已加载，不依赖进入微观时的预加载时机
     const itU = microBuildItemById(microOpenBuilding.type);
     if (itU && itU.levels && itU.levels[res.level]) {
@@ -8463,7 +8476,10 @@ async function flushBuildSave() {
   if (!microState) return;
   const t = microState.tile;
   const items = microBuildings[t.q + ',' + t.r] || [];
-  const res = await API.saveMicroBuild(t.q, t.r, items);
+  // 剥离运行时视觉等级字段(visualLevel)：它只在升级动画期间临时存在，
+  // 不能持久化进存档，否则动画未播完就存档、重开后会卡在旧外观。后端只认真实 level。
+  const clean = items.map(b => { const c = Object.assign({}, b); delete c.visualLevel; return c; });
+  const res = await API.saveMicroBuild(t.q, t.r, clean);
   if (!res || !res.ok) {
     if (res && res.error === 'auth') {
       microToast('建造未保存：请先登录游戏（建造需登录 Odoo）');