diff --git a/apps/editor/components/build-tab.tsx b/apps/editor/components/build-tab.tsx
index 175f3c8a..32af88e0 100644
--- a/apps/editor/components/build-tab.tsx
+++ b/apps/editor/components/build-tab.tsx
@@ -1,6 +1,6 @@
 'use client'
 
-import { MaterialPaintPanel, useEditor } from '@pascal-app/editor'
+import { MaterialPaintPanel, triggerSFX, useEditor } from '@pascal-app/editor'
 import Image from 'next/image'
 import { useCallback, useEffect, useRef } from 'react'
 import {
@@ -131,7 +131,11 @@ export function BuildTab() {
                         ? 'bg-primary/10 ring-1 ring-primary/50'
                         : 'bg-muted/40 opacity-70 grayscale hover:bg-muted hover:opacity-100 hover:grayscale-0',
                     )}
-                    onClick={() => handleTypeClick(type)}
+                    onClick={() => {
+                      triggerSFX('sfx:menu-click')
+                      handleTypeClick(type)
+                    }}
+                    onMouseEnter={() => triggerSFX('sfx:menu-hover')}
                     type="button"
                   >
                     <Image
diff --git a/apps/editor/public/audios/sfx/grid_snap.mamd b/apps/editor/public/audios/sfx/grid_snap.mamd
new file mode 100644
index 00000000..1af25315
Binary files /dev/null and b/apps/editor/public/audios/sfx/grid_snap.mamd differ
diff --git a/apps/editor/public/audios/sfx/grid_snap_0.mp3 b/apps/editor/public/audios/sfx/grid_snap_0.mp3
new file mode 100644
index 00000000..3392aa58
Binary files /dev/null and b/apps/editor/public/audios/sfx/grid_snap_0.mp3 differ
diff --git a/apps/editor/public/audios/sfx/grid_snap_1.mp3 b/apps/editor/public/audios/sfx/grid_snap_1.mp3
new file mode 100644
index 00000000..ac2f764e
Binary files /dev/null and b/apps/editor/public/audios/sfx/grid_snap_1.mp3 differ
diff --git a/apps/editor/public/audios/sfx/grid_snap_2.mp3 b/apps/editor/public/audios/sfx/grid_snap_2.mp3
new file mode 100644
index 00000000..35a2a9a6
Binary files /dev/null and b/apps/editor/public/audios/sfx/grid_snap_2.mp3 differ
diff --git a/apps/editor/public/audios/sfx/item_pick.mp3 b/apps/editor/public/audios/sfx/item_pick.mp3
index b1998427..7bbd78e8 100644
Binary files a/apps/editor/public/audios/sfx/item_pick.mp3 and b/apps/editor/public/audios/sfx/item_pick.mp3 differ
diff --git a/apps/editor/public/audios/sfx/item_place.mp3 b/apps/editor/public/audios/sfx/item_place.mp3
index 17b94fff..c3df566e 100644
Binary files a/apps/editor/public/audios/sfx/item_place.mp3 and b/apps/editor/public/audios/sfx/item_place.mp3 differ
diff --git a/apps/editor/public/audios/sfx/item_rotate.mp3 b/apps/editor/public/audios/sfx/item_rotate.mp3
index e5c94a6a..6924a71a 100644
Binary files a/apps/editor/public/audios/sfx/item_rotate.mp3 and b/apps/editor/public/audios/sfx/item_rotate.mp3 differ
diff --git a/apps/editor/public/audios/sfx/menu_click.mp3 b/apps/editor/public/audios/sfx/menu_click.mp3
new file mode 100644
index 00000000..e79563b7
Binary files /dev/null and b/apps/editor/public/audios/sfx/menu_click.mp3 differ
diff --git a/apps/editor/public/audios/sfx/menu_hover.mp3 b/apps/editor/public/audios/sfx/menu_hover.mp3
new file mode 100644
index 00000000..ea1421b9
Binary files /dev/null and b/apps/editor/public/audios/sfx/menu_hover.mp3 differ
diff --git a/apps/editor/public/audios/sfx/structure_build_end.mp3 b/apps/editor/public/audios/sfx/structure_build_end.mp3
new file mode 100644
index 00000000..6fd51ee2
Binary files /dev/null and b/apps/editor/public/audios/sfx/structure_build_end.mp3 differ
diff --git a/apps/editor/public/audios/sfx/structure_build_start.mp3 b/apps/editor/public/audios/sfx/structure_build_start.mp3
new file mode 100644
index 00000000..5fd957cf
Binary files /dev/null and b/apps/editor/public/audios/sfx/structure_build_start.mp3 differ
diff --git a/packages/editor/src/components/editor/floorplan-panel.tsx b/packages/editor/src/components/editor/floorplan-panel.tsx
index f2da8a02..c7f2a466 100644
--- a/packages/editor/src/components/editor/floorplan-panel.tsx
+++ b/packages/editor/src/components/editor/floorplan-panel.tsx
@@ -7839,6 +7839,9 @@ export function FloorplanPanel() {
         return
       }
 
+      // Every non-closing vertex is a "start" tick; closing the polygon above
+      // creates the zone and fires the structure-build (end) cue.
+      sfxEmitter.emit('sfx:structure-build-start')
       setZoneDraftPoints((currentPoints) => [...currentPoints, point])
       setCursorPoint(point)
     },
diff --git a/packages/editor/src/components/tools/roof/roof-tool.tsx b/packages/editor/src/components/tools/roof/roof-tool.tsx
index 2290a7f5..773aa396 100644
--- a/packages/editor/src/components/tools/roof/roof-tool.tsx
+++ b/packages/editor/src/components/tools/roof/roof-tool.tsx
@@ -295,6 +295,7 @@ export const RoofTool: React.FC = () => {
         useAlignmentGuides.getState().clear()
       } else {
         corner1Ref.current = [gridX, y, gridZ]
+        sfxEmitter.emit('sfx:structure-build-start')
         setPreview((prev) => ({
           ...prev,
           corner1: corner1Ref.current,
diff --git a/packages/editor/src/components/tools/zone/zone-tool.tsx b/packages/editor/src/components/tools/zone/zone-tool.tsx
index 0f0ae0e1..73006499 100644
--- a/packages/editor/src/components/tools/zone/zone-tool.tsx
+++ b/packages/editor/src/components/tools/zone/zone-tool.tsx
@@ -236,7 +236,9 @@ export const ZoneTool: React.FC = () => {
         mainLineRef.current.visible = false
         closingLineRef.current.visible = false
       } else {
-        // Add point to polygon
+        // Add point to polygon. Every non-closing vertex is a "start" tick;
+        // closing the polygon above fires the structure-build (end) cue.
+        sfxEmitter.emit('sfx:structure-build-start')
         pointsRef.current = [...pointsRef.current, clickPoint]
         updatePreview()
       }
diff --git a/packages/editor/src/components/ui/action-menu/action-button.tsx b/packages/editor/src/components/ui/action-menu/action-button.tsx
index cb48c309..6f4c4eb3 100644
--- a/packages/editor/src/components/ui/action-menu/action-button.tsx
+++ b/packages/editor/src/components/ui/action-menu/action-button.tsx
@@ -5,6 +5,7 @@ import {
   TooltipContent,
   TooltipTrigger,
 } from './../../../components/ui/primitives/tooltip'
+import { triggerSFX } from './../../../lib/sfx-bus'
 import { cn } from './../../../lib/utils'
 
 interface ActionButtonProps extends React.ComponentProps<typeof Button> {
@@ -17,7 +18,18 @@ interface ActionButtonProps extends React.ComponentProps<typeof Button> {
 
 export const ActionButton = React.forwardRef<HTMLButtonElement, ActionButtonProps>(
   (
-    { className, children, label, shortcut, isActive, tooltipContent, tooltipSide, ...props },
+    {
+      className,
+      children,
+      label,
+      shortcut,
+      isActive,
+      tooltipContent,
+      tooltipSide,
+      onClick,
+      onMouseEnter,
+      ...props
+    },
     ref,
   ) => {
     return (
@@ -25,6 +37,14 @@ export const ActionButton = React.forwardRef<HTMLButtonElement, ActionButtonProp
         <TooltipTrigger asChild>
           <Button
             className={cn('relative h-11 w-11 transition-all', className)}
+            onClick={(event) => {
+              triggerSFX('sfx:menu-click')
+              onClick?.(event)
+            }}
+            onMouseEnter={(event) => {
+              triggerSFX('sfx:menu-hover')
+              onMouseEnter?.(event)
+            }}
             ref={ref}
             {...props}
           >
diff --git a/packages/editor/src/components/ui/item-catalog/item-catalog.tsx b/packages/editor/src/components/ui/item-catalog/item-catalog.tsx
index 7e3abb64..8d5206e8 100644
--- a/packages/editor/src/components/ui/item-catalog/item-catalog.tsx
+++ b/packages/editor/src/components/ui/item-catalog/item-catalog.tsx
@@ -9,6 +9,7 @@ import {
   TooltipContent,
   TooltipTrigger,
 } from './../../../components/ui/primitives/tooltip'
+import { triggerSFX } from './../../../lib/sfx-bus'
 import { cn } from './../../../lib/utils'
 import useEditor, { type CatalogCategory } from './../../../store/use-editor'
 import { CATALOG_ITEMS } from './catalog-items'
@@ -94,10 +95,12 @@ export function ItemCatalog({
             )}
             key={index}
             onClick={() => {
+              triggerSFX('sfx:menu-click')
               setSelectedItem(item)
               setTool('item')
               setMode('build')
             }}
+            onMouseEnter={() => triggerSFX('sfx:menu-hover')}
             type="button"
           >
             <div className="relative aspect-square w-full overflow-hidden rounded-lg">
diff --git a/packages/editor/src/components/ui/sidebar/panels/items-panel/function-tree-panel.tsx b/packages/editor/src/components/ui/sidebar/panels/items-panel/function-tree-panel.tsx
index 851170b8..54b0002e 100644
--- a/packages/editor/src/components/ui/sidebar/panels/items-panel/function-tree-panel.tsx
+++ b/packages/editor/src/components/ui/sidebar/panels/items-panel/function-tree-panel.tsx
@@ -4,6 +4,7 @@ import type { AssetInput } from '@pascal-app/core'
 import { Root as TooltipRoot } from '@radix-ui/react-tooltip'
 import NextImage from 'next/image'
 import { useMemo, useState } from 'react'
+import { triggerSFX } from '../../../../../lib/sfx-bus'
 import { cn } from '../../../../../lib/utils'
 import { ItemCatalog } from '../../../item-catalog/item-catalog'
 import {
@@ -132,7 +133,11 @@ export function FunctionTreePanel({
                         ? 'bg-primary/10 ring-1 ring-primary/50'
                         : 'bg-muted/40 opacity-70 grayscale hover:bg-muted hover:opacity-100 hover:grayscale-0',
                     )}
-                    onClick={() => selectRoot(root.slug)}
+                    onClick={() => {
+                      triggerSFX('sfx:menu-click')
+                      selectRoot(root.slug)
+                    }}
+                    onMouseEnter={() => triggerSFX('sfx:menu-hover')}
                     type="button"
                   >
                     {root.iconUrl ? (
diff --git a/packages/editor/src/components/ui/sidebar/panels/items-panel/index.tsx b/packages/editor/src/components/ui/sidebar/panels/items-panel/index.tsx
index 6f3c61d2..df81988a 100644
--- a/packages/editor/src/components/ui/sidebar/panels/items-panel/index.tsx
+++ b/packages/editor/src/components/ui/sidebar/panels/items-panel/index.tsx
@@ -3,6 +3,7 @@
 import type { AssetInput } from '@pascal-app/core'
 import NextImage from 'next/image'
 import { useEffect, useState } from 'react'
+import { triggerSFX } from '../../../../../lib/sfx-bus'
 import { cn } from '../../../../../lib/utils'
 import type { CatalogCategory } from '../../../../../store/use-editor'
 import useEditor from '../../../../../store/use-editor'
@@ -206,7 +207,11 @@ function LegacyItemsPanel({
                   : 'text-muted-foreground hover:bg-sidebar-accent/50 hover:text-foreground',
               )}
               key={cat.catalogCategory}
-              onClick={() => selectCategory(cat.catalogCategory)}
+              onClick={() => {
+                triggerSFX('sfx:menu-click')
+                selectCategory(cat.catalogCategory)
+              }}
+              onMouseEnter={() => triggerSFX('sfx:menu-hover')}
               type="button"
             >
               <NextImage
diff --git a/packages/editor/src/components/ui/sidebar/tab-bar.tsx b/packages/editor/src/components/ui/sidebar/tab-bar.tsx
index 3e3f5b05..446d17b8 100644
--- a/packages/editor/src/components/ui/sidebar/tab-bar.tsx
+++ b/packages/editor/src/components/ui/sidebar/tab-bar.tsx
@@ -1,6 +1,7 @@
 'use client'
 
 import type { ReactNode } from 'react'
+import { triggerSFX } from './../../../lib/sfx-bus'
 import { cn } from './../../../lib/utils'
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '../primitives/tooltip'
 
@@ -33,7 +34,11 @@ export function TabBar({ tabs, activeTab, onTabChange }: TabBarProps) {
                 : 'text-muted-foreground hover:bg-accent/50 hover:text-foreground',
             )}
             key={tab.id}
-            onClick={() => onTabChange(tab.id)}
+            onClick={() => {
+              triggerSFX('sfx:menu-click')
+              onTabChange(tab.id)
+            }}
+            onMouseEnter={() => triggerSFX('sfx:menu-hover')}
             type="button"
           >
             {tab.label}
@@ -77,7 +82,11 @@ export function IconRail({ tabs, activeTab, collapsed, onIconClick }: IconRailPr
                       ? 'bg-accent text-foreground shadow-sm [&_img]:opacity-100 [&_img]:grayscale-0'
                       : 'text-muted-foreground hover:bg-accent/50 hover:text-foreground [&_img]:opacity-60 [&_img]:grayscale hover:[&_img]:opacity-100 hover:[&_img]:grayscale-0',
                   )}
-                  onClick={() => onIconClick(tab.id)}
+                  onClick={() => {
+                    triggerSFX('sfx:menu-click')
+                    onIconClick(tab.id)
+                  }}
+                  onMouseEnter={() => triggerSFX('sfx:menu-hover')}
                   type="button"
                 >
                   {tab.icon ?? tab.label.charAt(0)}
diff --git a/packages/editor/src/lib/sfx-bus.ts b/packages/editor/src/lib/sfx-bus.ts
index 8dae92f4..109cb539 100644
--- a/packages/editor/src/lib/sfx-bus.ts
+++ b/packages/editor/src/lib/sfx-bus.ts
@@ -10,9 +10,12 @@ type SFXEvents = {
   'sfx:item-pick': undefined
   'sfx:item-place': undefined
   'sfx:item-rotate': undefined
+  'sfx:structure-build-start': undefined
   'sfx:structure-build': undefined
   'sfx:structure-delete': undefined
   'sfx:snapshot-capture': undefined
+  'sfx:menu-hover': undefined
+  'sfx:menu-click': undefined
 }
 
 /**
@@ -36,9 +39,12 @@ export function initSFXBus() {
   sfxEmitter.on('sfx:item-pick', () => playSFX('itemPick'))
   sfxEmitter.on('sfx:item-place', () => playSFX('itemPlace'))
   sfxEmitter.on('sfx:item-rotate', () => playSFX('itemRotate'))
-  sfxEmitter.on('sfx:structure-build', () => playSFX('structureBuild'))
+  sfxEmitter.on('sfx:structure-build-start', () => playSFX('structureBuildStart'))
+  sfxEmitter.on('sfx:structure-build', () => playSFX('structureBuildEnd'))
   sfxEmitter.on('sfx:structure-delete', () => playSFX('structureDelete'))
   sfxEmitter.on('sfx:snapshot-capture', () => playSFX('snapshotCapture'))
+  sfxEmitter.on('sfx:menu-hover', () => playSFX('menuHover'))
+  sfxEmitter.on('sfx:menu-click', () => playSFX('menuClick'))
 }
 
 /**
diff --git a/packages/editor/src/lib/sfx-player.ts b/packages/editor/src/lib/sfx-player.ts
index 8c177996..a510642d 100644
--- a/packages/editor/src/lib/sfx-player.ts
+++ b/packages/editor/src/lib/sfx-player.ts
@@ -5,7 +5,8 @@ import useAudio from '../store/use-audio'
 // so a rate range of ~0.88–1.12 reads as a subtle ±2 semitones — enough to kill the
 // machine-gun feeling when the same SFX fires in rapid succession.
 type SFXConfig = {
-  src: string
+  // One file, or several pre-rendered variations cycled round-robin per play.
+  src: string | string[]
   // Random playback-rate range applied per play (1 = unchanged).
   rateRange?: [number, number]
   // Random volume multiplier range applied per play (1 = unchanged).
@@ -24,10 +25,15 @@ const DEFAULT_MIN_INTERVAL_MS = 30
 // SFX sound definitions
 export const SFX: Record<string, SFXConfig> = {
   gridSnap: {
-    src: '/audios/sfx/grid_snap.mp3',
-    rateRange: [0.94, 1.06],
-    volumeRange: [0.92, 1.0],
+    src: [
+      '/audios/sfx/grid_snap_0.mp3',
+      '/audios/sfx/grid_snap_1.mp3',
+      '/audios/sfx/grid_snap_2.mp3',
+    ],
+    rateRange: [0.98, 1.02],
+    volumeRange: [0.5, 0.6],
     panJitter: 0.15,
+    minIntervalMs: 50,
   },
   itemDelete: {
     src: '/audios/sfx/item_delete.mp3',
@@ -37,13 +43,13 @@ export const SFX: Record<string, SFXConfig> = {
   },
   itemPick: {
     src: '/audios/sfx/item_pick.mp3',
-    rateRange: [0.92, 1.08],
+    rateRange: [0.95, 1.05],
     volumeRange: [0.92, 1.0],
     panJitter: 0.15,
   },
   itemPlace: {
     src: '/audios/sfx/item_place.mp3',
-    rateRange: [0.98, 1.06],
+    rateRange: [0.98, 1.02],
     volumeRange: [0.9, 1.0],
     panJitter: 0.15,
   },
@@ -53,8 +59,16 @@ export const SFX: Record<string, SFXConfig> = {
     volumeRange: [0.92, 1.0],
     panJitter: 0.15,
   },
-  structureBuild: {
-    src: '/audios/sfx/structure_build.mp3',
+  // Fired when a structure draft begins (first click of a wall/slab/etc).
+  structureBuildStart: {
+    src: '/audios/sfx/structure_build_start.mp3',
+    rateRange: [0.95, 1.05],
+    volumeRange: [0.88, 1.0],
+    panJitter: 0.15,
+  },
+  // Fired when a structure is committed (segment placed / polygon closed).
+  structureBuildEnd: {
+    src: '/audios/sfx/structure_build_end.mp3',
     rateRange: [0.95, 1.05],
     volumeRange: [0.88, 1.0],
     panJitter: 0.15,
@@ -69,6 +83,23 @@ export const SFX: Record<string, SFXConfig> = {
     // Shutter should sound consistent — no variation.
     src: '/audios/sfx/snapshot_capture.mp3',
   },
+  // Soft tick when hovering a main category in the Build / Items panels.
+  // Kept quiet and rate-locked so sweeping across the grid reads as texture,
+  // not a melody.
+  menuHover: {
+    src: '/audios/sfx/menu_hover.mp3',
+    rateRange: [0.98, 1.02],
+    volumeRange: [0.2, 0.3],
+    panJitter: 0.1,
+    minIntervalMs: 0,
+  },
+  // Fired when a main category in the Build / Items panels is clicked.
+  menuClick: {
+    src: '/audios/sfx/menu_click.mp3',
+    rateRange: [0.98, 1.02],
+    volumeRange: [0.5, 0.6],
+    panJitter: 0.1,
+  },
 } as const
 
 export type SFXName = keyof typeof SFX
@@ -77,26 +108,32 @@ function randomInRange([min, max]: [number, number]): number {
   return min + Math.random() * (max - min)
 }
 
-// Preload all SFX sounds
-const sfxCache = new Map<SFXName, Howl>()
+// Preload all SFX sounds. Each variation gets its own Howl so they can overlap
+// and be cycled round-robin.
+const sfxCache = new Map<SFXName, Howl[]>()
 const lastPlayedAt = new Map<SFXName, number>()
+const lastVariation = new Map<SFXName, number>()
 
 // Initialize all sounds
 Object.entries(SFX).forEach(([name, config]) => {
-  const sound = new Howl({
-    src: [config.src],
-    preload: true,
-    volume: 0.5, // Will be adjusted by the bus
-  })
-  sfxCache.set(name as SFXName, sound)
+  const sources = Array.isArray(config.src) ? config.src : [config.src]
+  const sounds = sources.map(
+    (src) =>
+      new Howl({
+        src: [src],
+        preload: true,
+        volume: 0.5, // Will be adjusted by the bus
+      }),
+  )
+  sfxCache.set(name as SFXName, sounds)
 })
 
 /**
  * Play a sound effect with volume based on audio settings
  */
 export function playSFX(name: SFXName) {
-  const sound = sfxCache.get(name)
-  if (!sound) {
+  const sounds = sfxCache.get(name)
+  if (!sounds || sounds.length === 0) {
     console.warn(`SFX not found: ${name}`)
     return
   }
@@ -110,6 +147,15 @@ export function playSFX(name: SFXName) {
   if (last !== undefined && now - last < minInterval) return
   lastPlayedAt.set(name, now)
 
+  // Pick a random variation, avoiding an immediate repeat of the last one so
+  // consecutive plays don't land on the same file.
+  let index = Math.floor(Math.random() * sounds.length)
+  if (sounds.length > 1 && index === lastVariation.get(name)) {
+    index = (index + 1) % sounds.length
+  }
+  lastVariation.set(name, index)
+  const sound = sounds[index]!
+
   const { masterVolume, sfxVolume, muted } = useAudio.getState()
 
   if (muted) return
@@ -137,7 +183,9 @@ export function updateSFXVolumes() {
   const { masterVolume, sfxVolume } = useAudio.getState()
   const finalVolume = (masterVolume / 100) * (sfxVolume / 100)
 
-  sfxCache.forEach((sound) => {
-    sound.volume(finalVolume)
+  sfxCache.forEach((sounds) => {
+    sounds.forEach((sound) => {
+      sound.volume(finalVolume)
+    })
   })
 }
diff --git a/packages/nodes/src/ceiling/tool.tsx b/packages/nodes/src/ceiling/tool.tsx
index 2eda4f68..ee445086 100644
--- a/packages/nodes/src/ceiling/tool.tsx
+++ b/packages/nodes/src/ceiling/tool.tsx
@@ -201,6 +201,9 @@ export const CeilingTool: React.FC = () => {
         setPoints([])
         useAlignmentGuides.getState().clear()
       } else {
+        // Every non-closing vertex is a "start" tick; the closing click above
+        // fires the structure-build (end) cue.
+        triggerSFX('sfx:structure-build-start')
         setPoints([...points, clickPoint])
       }
     }
diff --git a/packages/nodes/src/door/move-tool.tsx b/packages/nodes/src/door/move-tool.tsx
index fd9e8d57..6256d706 100644
--- a/packages/nodes/src/door/move-tool.tsx
+++ b/packages/nodes/src/door/move-tool.tsx
@@ -349,7 +349,7 @@ const MoveDoorTool: React.FC<{ node: DoorNode }> = ({ node: movingDoorNode }) =>
       useLiveTransforms.getState().clear(movingDoorNode.id)
       useScene.temporal.getState().pause()
 
-      triggerSFX('sfx:item-place')
+      triggerSFX('sfx:structure-build')
       hideCursor()
       useViewer.getState().setSelection({ selectedIds: [placedId] })
       exitMoveMode()
diff --git a/packages/nodes/src/door/tool.tsx b/packages/nodes/src/door/tool.tsx
index d50eff37..e579246e 100644
--- a/packages/nodes/src/door/tool.tsx
+++ b/packages/nodes/src/door/tool.tsx
@@ -323,7 +323,7 @@ const DoorTool: React.FC = () => {
       useScene.getState().createNode(node, event.node.id as AnyNodeId)
       useViewer.getState().setSelection({ selectedIds: [node.id] })
       useScene.temporal.getState().pause()
-      triggerSFX('sfx:item-place')
+      triggerSFX('sfx:structure-build')
       alignmentCandidates = collectAlignmentAnchors(useScene.getState().nodes, '')
       useAlignmentGuides.getState().clear()
 
diff --git a/packages/nodes/src/fence/tool.tsx b/packages/nodes/src/fence/tool.tsx
index 6d071664..f7074b79 100644
--- a/packages/nodes/src/fence/tool.tsx
+++ b/packages/nodes/src/fence/tool.tsx
@@ -569,6 +569,7 @@ export const FenceTool: React.FC = () => {
         startingPoint.current.set(snappedStart[0], event.localPosition[1], snappedStart[1])
         endingPoint.current.copy(startingPoint.current)
         buildingState.current = 1
+        triggerSFX('sfx:structure-build-start')
         previewRef.current.visible = true
         setDraftMeasurement(null)
       } else {
diff --git a/packages/nodes/src/shelf/tool.tsx b/packages/nodes/src/shelf/tool.tsx
index 740feaf4..997e8276 100644
--- a/packages/nodes/src/shelf/tool.tsx
+++ b/packages/nodes/src/shelf/tool.tsx
@@ -181,7 +181,7 @@ const ShelfTool = () => {
       })
       useScene.getState().createNode(shelf, activeLevelId)
       useViewer.getState().setSelection({ selectedIds: [shelf.id] })
-      triggerSFX('sfx:structure-build')
+      triggerSFX('sfx:item-place')
       // The placed shelf is now a valid alignment target for the next one;
       // refresh the candidate pool and drop the guide from this drop.
       alignmentCandidates = collectAlignmentAnchors(useScene.getState().nodes, previewNode.id)
diff --git a/packages/nodes/src/slab/tool.tsx b/packages/nodes/src/slab/tool.tsx
index e80cc372..e751ea25 100644
--- a/packages/nodes/src/slab/tool.tsx
+++ b/packages/nodes/src/slab/tool.tsx
@@ -178,6 +178,9 @@ export const SlabTool: React.FC = () => {
         setPoints([])
         useAlignmentGuides.getState().clear()
       } else {
+        // Every non-closing vertex is a "start" tick; the closing click above
+        // fires the structure-build (end) cue.
+        triggerSFX('sfx:structure-build-start')
         setPoints([...points, clickPoint])
       }
     }
diff --git a/packages/nodes/src/wall/tool.tsx b/packages/nodes/src/wall/tool.tsx
index 083ce0a2..0d8825d2 100644
--- a/packages/nodes/src/wall/tool.tsx
+++ b/packages/nodes/src/wall/tool.tsx
@@ -538,6 +538,7 @@ export const WallTool: React.FC = () => {
         startingPoint.current.set(snappedStart[0], event.localPosition[1], snappedStart[1])
         endingPoint.current.copy(startingPoint.current)
         buildingState.current = 1
+        triggerSFX('sfx:structure-build-start')
         // Visibility is owned by `updateWallPreview` — it flips
         // `mesh.visible` based on segment length. Setting it here
         // (before any geometry data has been written) draws the
diff --git a/packages/nodes/src/window/move-tool.tsx b/packages/nodes/src/window/move-tool.tsx
index 52c59d93..9d5ba082 100644
--- a/packages/nodes/src/window/move-tool.tsx
+++ b/packages/nodes/src/window/move-tool.tsx
@@ -381,7 +381,7 @@ const MoveWindowTool: React.FC<{ node: WindowNode }> = ({ node: movingWindowNode
       useLiveTransforms.getState().clear(movingWindowNode.id)
       useScene.temporal.getState().pause()
 
-      triggerSFX('sfx:item-place')
+      triggerSFX('sfx:structure-build')
       hideCursor()
       useViewer.getState().setSelection({ selectedIds: [placedId] })
       exitMoveMode()
diff --git a/packages/nodes/src/window/tool.tsx b/packages/nodes/src/window/tool.tsx
index 0850ff07..36d718d0 100644
--- a/packages/nodes/src/window/tool.tsx
+++ b/packages/nodes/src/window/tool.tsx
@@ -331,7 +331,7 @@ const WindowTool: React.FC = () => {
       useScene.getState().createNode(node, event.node.id as AnyNodeId)
       useViewer.getState().setSelection({ selectedIds: [node.id] })
       useScene.temporal.getState().pause()
-      triggerSFX('sfx:item-place')
+      triggerSFX('sfx:structure-build')
       alignmentCandidates = collectAlignmentAnchors(useScene.getState().nodes, '')
       useAlignmentGuides.getState().clear()