diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index e7258ae73a..686171df05 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -72,9 +72,10 @@
 - Fix: [#18009] Visual glitch with litter at edge of sloped path.
 - Fix: [#18025] Fix land ownership in Six Holland, Six Flags Magic Mountain, North America - Grand Canyon and Asia - Great Wall of China Tourism Enhancement scenarios. 
 - Fix: [#18026] Park rating drops to 0 with more than 32k guests, total ride excitement or intensity.
-- Fix: [#18051] Visual glitch with Mine Ride's large unbanked turn.
 - Fix: [#18032] All non-interactive widgets (labels, groupboxes) produce sound when clicked.
 - Fix: [#18035] Favourited servers don’t get their online status updated.
+- Fix: [#18051] Visual glitch with Mine Ride's large unbanked turn.
+- Fix: [#18059] [Plugin] Width and height of custom window not changeable via script.
 
 0.4.1 (2022-07-04)
 ------------------------------------------------------------------------
diff --git a/distribution/openrct2.d.ts b/distribution/openrct2.d.ts
index ceb687adf6..be3f141b22 100644
--- a/distribution/openrct2.d.ts
+++ b/distribution/openrct2.d.ts
@@ -2666,20 +2666,29 @@ declare global {
     }
 
     interface Window {
-        classification: number;
-        number: number;
+        readonly classification: number;
+        readonly number: number;
         x: number;
         y: number;
+        /**
+         * The window is resizable (by the user) if and only if minWidth !== maxWidth or minHeight !== maxHeight.
+         * In that case, the window displays a small widget in the lower right corner that the user can use to resize the window by clicking and dragging.
+         * 
+         * When writing to width (or height), if the window is resizable, the new value will be clamped to fit the corresponding min/max values.
+         * Otherwise, if the window is not resizable, both the width (or height) and the corresponding min/max values are set to the new value.
+         * 
+         * For the default min/max values, see {@link WindowDesc}.
+         */
         width: number;
         height: number;
         minWidth: number;
         maxWidth: number;
         minHeight: number;
         maxHeight: number;
-        isSticky: boolean;
+        readonly isSticky: boolean;
         colours: number[];
         title: string;
-        widgets: Widget[];
+        readonly widgets: Widget[];
         tabIndex: number;
 
         close(): void;
@@ -2695,6 +2704,14 @@ declare global {
         height: number;
         title: string;
         id?: number;
+        /**
+         * See {@link Window} for information about the behaviour of min/max width/height after window creation.
+         * 
+         * Behaviour during window creation:
+         * If at least one of the parameters min/max width/height is present, the window is considered to be resizable.
+         * In that case, the min values default to zero (if unspecified) and the max values default to 0xFFFF (if unspecified).
+         * Otherwise, the min/max width values default to width and the min/max height values default to height.
+         */
         minWidth?: number;
         minHeight?: number;
         maxWidth?: number;
diff --git a/src/openrct2-ui/scripting/ScWindow.hpp b/src/openrct2-ui/scripting/ScWindow.hpp
index 7b596ec33f..8b47391334 100644
--- a/src/openrct2-ui/scripting/ScWindow.hpp
+++ b/src/openrct2-ui/scripting/ScWindow.hpp
@@ -99,7 +99,14 @@ namespace OpenRCT2::Scripting
             auto w = GetWindow();
             if (w != nullptr)
             {
-                window_resize(*w, value - w->width, 0);
+                if (window_can_resize(*w))
+                {
+                    window_resize(*w, value - w->width, 0);
+                }
+                else
+                {
+                    window_set_resize(*w, value, w->min_height, value, w->max_height);
+                }
             }
         }
         int32_t height_get() const
@@ -116,7 +123,14 @@ namespace OpenRCT2::Scripting
             auto w = GetWindow();
             if (w != nullptr)
             {
-                window_resize(*w, 0, value - w->height);
+                if (window_can_resize(*w))
+                {
+                    window_resize(*w, 0, value - w->height);
+                }
+                else
+                {
+                    window_set_resize(*w, w->min_width, value, w->max_width, value);
+                }
             }
         }
         int32_t minWidth_get() const
diff --git a/src/openrct2/scripting/ScriptEngine.h b/src/openrct2/scripting/ScriptEngine.h
index b11cabd1b7..1c7bec8c5f 100644
--- a/src/openrct2/scripting/ScriptEngine.h
+++ b/src/openrct2/scripting/ScriptEngine.h
@@ -46,7 +46,7 @@ namespace OpenRCT2
 
 namespace OpenRCT2::Scripting
 {
-    static constexpr int32_t OPENRCT2_PLUGIN_API_VERSION = 60;
+    static constexpr int32_t OPENRCT2_PLUGIN_API_VERSION = 61;
 
     // Versions marking breaking changes.
     static constexpr int32_t API_VERSION_33_PEEP_DEPRECATION = 33;