diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index 32a5429977..5417294eaf 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -34,6 +34,7 @@
 - Fix: [#15377] Entrance/exit ghost doesn't work on different stations without touching them first.
 - Fix: [#15476] Crash when placing/clearing small scenery.
 - Fix: [#15487] Map animations do not work correctly when loading an exported SV6 file in vanilla RCT2.
+- Fix: [#15490] Tile inspector needlessly updates clearance height when changing surface slopes.
 - Fix: [#15496] Crash in paint_swinging_inverter_ship_structure().
 - Fix: [#15503] Freeze when doing specific coaster merges with block brakes.
 - Fix: [#15514] Two different “quit to menu” menu items are available in track designer and track design manager.
diff --git a/src/openrct2/world/TileInspector.cpp b/src/openrct2/world/TileInspector.cpp
index 56c5613875..fcb3a3798f 100644
--- a/src/openrct2/world/TileInspector.cpp
+++ b/src/openrct2/world/TileInspector.cpp
@@ -587,49 +587,37 @@ namespace OpenRCT2::TileInspector
         if (isExecuting)
         {
             const uint8_t originalSlope = surfaceElement->GetSlope();
-            const bool diagonal = (originalSlope & TILE_ELEMENT_SLOPE_DOUBLE_HEIGHT) >> 4;
-
             uint8_t newSlope = surfaceElement->GetSlope() ^ (1 << cornerIndex);
-            surfaceElement->SetSlope(newSlope);
-            if (surfaceElement->GetSlope() & TILE_ELEMENT_SLOPE_ALL_CORNERS_UP)
-            {
-                surfaceElement->clearance_height = surfaceElement->base_height + 2;
-            }
-            else
-            {
-                surfaceElement->clearance_height = surfaceElement->base_height;
-            }
 
             // All corners are raised
-            if ((surfaceElement->GetSlope() & TILE_ELEMENT_SLOPE_ALL_CORNERS_UP) == TILE_ELEMENT_SLOPE_ALL_CORNERS_UP)
+            if ((newSlope & TILE_ELEMENT_SLOPE_ALL_CORNERS_UP) == TILE_ELEMENT_SLOPE_ALL_CORNERS_UP)
             {
-                uint8_t slope = TILE_ELEMENT_SLOPE_FLAT;
-
-                if (diagonal)
+                newSlope = TILE_ELEMENT_SLOPE_FLAT;
+                if ((originalSlope & TILE_ELEMENT_SLOPE_DOUBLE_HEIGHT) != 0)
                 {
                     switch (originalSlope & TILE_ELEMENT_SLOPE_ALL_CORNERS_UP)
                     {
                         case TILE_ELEMENT_SLOPE_S_CORNER_DN:
-                            slope |= TILE_ELEMENT_SLOPE_N_CORNER_UP;
+                            newSlope |= TILE_ELEMENT_SLOPE_N_CORNER_UP;
                             break;
                         case TILE_ELEMENT_SLOPE_W_CORNER_DN:
-                            slope |= TILE_ELEMENT_SLOPE_E_CORNER_UP;
+                            newSlope |= TILE_ELEMENT_SLOPE_E_CORNER_UP;
                             break;
                         case TILE_ELEMENT_SLOPE_N_CORNER_DN:
-                            slope |= TILE_ELEMENT_SLOPE_S_CORNER_UP;
+                            newSlope |= TILE_ELEMENT_SLOPE_S_CORNER_UP;
                             break;
                         case TILE_ELEMENT_SLOPE_E_CORNER_DN:
-                            slope |= TILE_ELEMENT_SLOPE_W_CORNER_UP;
+                            newSlope |= TILE_ELEMENT_SLOPE_W_CORNER_UP;
                             break;
                     }
                 }
-                surfaceElement->SetSlope(slope);
 
-                // Update base and clearance heights
                 surfaceElement->base_height += 2;
-                surfaceElement->clearance_height = surfaceElement->base_height + (diagonal ? 2 : 0);
+                surfaceElement->clearance_height = surfaceElement->base_height;
             }
 
+            surfaceElement->SetSlope(newSlope);
+
             map_invalidate_tile_full(loc);
 
             if (auto* inspector = GetTileInspectorWithPos(loc); inspector != nullptr)
@@ -653,18 +641,6 @@ namespace OpenRCT2::TileInspector
         {
             uint8_t newSlope = surfaceElement->GetSlope() ^ TILE_ELEMENT_SLOPE_DOUBLE_HEIGHT;
             surfaceElement->SetSlope(newSlope);
-            if (surfaceElement->GetSlope() & TILE_ELEMENT_SLOPE_DOUBLE_HEIGHT)
-            {
-                surfaceElement->clearance_height = surfaceElement->base_height + 4;
-            }
-            else if (surfaceElement->GetSlope() & TILE_ELEMENT_SLOPE_ALL_CORNERS_UP)
-            {
-                surfaceElement->clearance_height = surfaceElement->base_height + 2;
-            }
-            else
-            {
-                surfaceElement->clearance_height = surfaceElement->base_height;
-            }
 
             map_invalidate_tile_full(loc);