diff --git a/src/config/ConfigManager.cpp b/src/config/ConfigManager.cpp
index 12b43b371..f0383d50b 100644
--- a/src/config/ConfigManager.cpp
+++ b/src/config/ConfigManager.cpp
@@ -2954,3 +2954,18 @@ std::string SConfigOptionDescription::jsonify() const {
 void CConfigManager::ensurePersistentWorkspacesPresent() {
     g_pCompositor->ensurePersistentWorkspacesPresent(m_vWorkspaceRules);
 }
+
+void CConfigManager::storeFloatingSize(PHLWINDOW window, const Vector2D& size) {
+    Debug::log(LOG, "storing floating size {}x{} for window {}::{}", size.x, size.y, window->m_szClass, window->m_szTitle);
+    SFloatCache id{window};
+    m_mStoredFloatingSizes[id] = size;
+}
+
+std::optional<Vector2D> CConfigManager::getStoredFloatingSize(PHLWINDOW window) {
+    SFloatCache id{window};
+    if (m_mStoredFloatingSizes.contains(id)) {
+        Debug::log(LOG, "got stored size {}x{} for window {}::{}", m_mStoredFloatingSizes[id].x, m_mStoredFloatingSizes[id].y, window->m_szClass, window->m_szTitle);
+        return m_mStoredFloatingSizes[id];
+    }
+    return std::nullopt;
+}
diff --git a/src/config/ConfigManager.hpp b/src/config/ConfigManager.hpp
index d9ea413ec..7ce378b1d 100644
--- a/src/config/ConfigManager.hpp
+++ b/src/config/ConfigManager.hpp
@@ -138,6 +138,27 @@ struct SFirstExecRequest {
     bool        withRules = false;
 };
 
+struct SFloatCache {
+    size_t hash;
+
+    SFloatCache(PHLWINDOW window) {
+        hash = std::hash<std::string>{}(window->m_szClass) ^ (std::hash<std::string>{}(window->m_szTitle) << 1);
+    }
+
+    bool operator==(const SFloatCache& other) const {
+        return hash == other.hash;
+    }
+};
+
+namespace std {
+    template <>
+    struct hash<SFloatCache> {
+        size_t operator()(const SFloatCache& id) const {
+            return id.hash;
+        }
+    };
+}
+
 class CConfigManager {
   public:
     CConfigManager();
@@ -232,6 +253,9 @@ class CConfigManager {
     bool                       isLaunchingExecOnce                    = false; // For exec-once to skip initial ws tracking
     bool                       m_bLastConfigVerificationWasSuccessful = true;
 
+    void                       storeFloatingSize(PHLWINDOW window, const Vector2D& size);
+    std::optional<Vector2D>    getStoredFloatingSize(PHLWINDOW window);
+
   private:
     UP<Hyprlang::CConfig>                            m_pConfig;
 
@@ -267,19 +291,21 @@ class CConfigManager {
     uint32_t                                         m_configValueNumber = 0;
 
     // internal methods
-    void                       updateBlurredLS(const std::string&, const bool);
-    void                       setDefaultAnimationVars();
-    std::optional<std::string> resetHLConfig();
-    std::optional<std::string> generateConfig(std::string configPath);
-    std::optional<std::string> verifyConfigExists();
-    void                       postConfigReload(const Hyprlang::CParseResult& result);
-    SWorkspaceRule             mergeWorkspaceRules(const SWorkspaceRule&, const SWorkspaceRule&);
+    void                                      updateBlurredLS(const std::string&, const bool);
+    void                                      setDefaultAnimationVars();
+    std::optional<std::string>                resetHLConfig();
+    std::optional<std::string>                generateConfig(std::string configPath);
+    std::optional<std::string>                verifyConfigExists();
+    void                                      postConfigReload(const Hyprlang::CParseResult& result);
+    SWorkspaceRule                            mergeWorkspaceRules(const SWorkspaceRule&, const SWorkspaceRule&);
 
-    void                       registerConfigVar(const char* name, const Hyprlang::INT& val);
-    void                       registerConfigVar(const char* name, const Hyprlang::FLOAT& val);
-    void                       registerConfigVar(const char* name, const Hyprlang::VEC2& val);
-    void                       registerConfigVar(const char* name, const Hyprlang::STRING& val);
-    void                       registerConfigVar(const char* name, Hyprlang::CUSTOMTYPE&& val);
+    void                                      registerConfigVar(const char* name, const Hyprlang::INT& val);
+    void                                      registerConfigVar(const char* name, const Hyprlang::FLOAT& val);
+    void                                      registerConfigVar(const char* name, const Hyprlang::VEC2& val);
+    void                                      registerConfigVar(const char* name, const Hyprlang::STRING& val);
+    void                                      registerConfigVar(const char* name, Hyprlang::CUSTOMTYPE&& val);
+
+    std::unordered_map<SFloatCache, Vector2D> m_mStoredFloatingSizes;
 
     friend struct SConfigOptionDescription;
 };
diff --git a/src/desktop/Window.cpp b/src/desktop/Window.cpp
index ceb5eb183..b7a3f8f69 100644
--- a/src/desktop/Window.cpp
+++ b/src/desktop/Window.cpp
@@ -791,6 +791,10 @@ void CWindow::applyDynamicRule(const SP<CWindowRule>& r) {
             }
             break;
         }
+        case CWindowRule::RULE_PERSISTENTSIZE: {
+            m_sWindowData.persistentSize = CWindowOverridableVar(true, PRIORITY_WINDOW_RULE);
+            break;
+        }
         default: break;
     }
 }
@@ -1323,6 +1327,11 @@ void CWindow::clampWindowSize(const std::optional<Vector2D> minSize, const std::
 
     *m_vRealPosition = m_vRealPosition->goal() + DELTA / 2.0;
     *m_vRealSize     = NEWSIZE;
+
+    if (m_bIsFloating && !m_bIsX11 && std::any_of(m_vMatchedRules.begin(), m_vMatchedRules.end(), [](const auto& r) { return r->ruleType == CWindowRule::RULE_PERSISTENTSIZE; })) {
+        Debug::log(LOG, "clamped window {}::{} to {}x{} (persistentsize)", m_szClass, m_szTitle, m_vRealSize->value().x, m_vRealSize->value().y);
+        g_pConfigManager->storeFloatingSize(m_pSelf.lock(), m_vRealSize->value());
+    }
 }
 
 bool CWindow::isFullscreen() {
diff --git a/src/desktop/Window.hpp b/src/desktop/Window.hpp
index ec3c0b217..3ed4ce757 100644
--- a/src/desktop/Window.hpp
+++ b/src/desktop/Window.hpp
@@ -198,6 +198,8 @@ struct SWindowData {
 
     CWindowOverridableVar<CGradientValueData> activeBorderColor;
     CWindowOverridableVar<CGradientValueData> inactiveBorderColor;
+
+    CWindowOverridableVar<bool>               persistentSize;
 };
 
 struct SInitialWorkspaceToken {
diff --git a/src/desktop/WindowRule.cpp b/src/desktop/WindowRule.cpp
index cf3004b01..23269085b 100644
--- a/src/desktop/WindowRule.cpp
+++ b/src/desktop/WindowRule.cpp
@@ -5,7 +5,7 @@
 #include "../config/ConfigManager.hpp"
 
 static const auto RULES = std::unordered_set<std::string>{
-    "float", "fullscreen", "maximize", "noinitialfocus", "pin", "stayfocused", "tile", "renderunfocused",
+    "float", "fullscreen", "maximize", "noinitialfocus", "pin", "stayfocused", "tile", "renderunfocused", "persistentsize",
 };
 static const auto RULES_PREFIX = std::unordered_set<std::string>{
     "animation", "bordercolor",   "bordersize", "center",    "content", "fullscreenstate", "group",    "idleinhibit",   "maxsize",     "minsize",
@@ -39,6 +39,8 @@ CWindowRule::CWindowRule(const std::string& rule, const std::string& value, bool
         ruleType = RULE_TILE;
     else if (rule == "renderunfocused")
         ruleType = RULE_RENDERUNFOCUSED;
+    else if (rule == "persistentsize")
+        ruleType = RULE_PERSISTENTSIZE;
     else if (rule.starts_with("animation"))
         ruleType = RULE_ANIMATION;
     else if (rule.starts_with("bordercolor"))
diff --git a/src/desktop/WindowRule.hpp b/src/desktop/WindowRule.hpp
index 50e221f3e..192d8aa71 100644
--- a/src/desktop/WindowRule.hpp
+++ b/src/desktop/WindowRule.hpp
@@ -37,6 +37,7 @@ class CWindowRule {
         RULE_WORKSPACE,
         RULE_PROP,
         RULE_CONTENT,
+        RULE_PERSISTENTSIZE,
     };
 
     eRuleType         ruleType = RULE_INVALID;
diff --git a/src/layout/IHyprLayout.cpp b/src/layout/IHyprLayout.cpp
index e84ffb213..dc6de9e3a 100644
--- a/src/layout/IHyprLayout.cpp
+++ b/src/layout/IHyprLayout.cpp
@@ -14,9 +14,17 @@
 #include "../managers/HookSystemManager.hpp"
 
 void IHyprLayout::onWindowCreated(PHLWINDOW pWindow, eDirection direction) {
-    CBox desiredGeometry = g_pXWaylandManager->getGeometryForWindow(pWindow);
+    CBox       desiredGeometry = g_pXWaylandManager->getGeometryForWindow(pWindow);
 
-    if (desiredGeometry.width <= 5 || desiredGeometry.height <= 5) {
+    const bool HASPERSISTENTSIZE =
+        std::any_of(pWindow->m_vMatchedRules.begin(), pWindow->m_vMatchedRules.end(), [](const auto& rule) { return rule->ruleType == CWindowRule::RULE_PERSISTENTSIZE; });
+
+    const auto STOREDSIZE = HASPERSISTENTSIZE ? g_pConfigManager->getStoredFloatingSize(pWindow) : std::nullopt;
+
+    if (STOREDSIZE.has_value()) {
+        Debug::log(LOG, "using stored size {}x{} for new window {}::{}", STOREDSIZE->x, STOREDSIZE->y, pWindow->m_szClass, pWindow->m_szTitle);
+        pWindow->m_vLastFloatingSize = STOREDSIZE.value();
+    } else if (desiredGeometry.width <= 5 || desiredGeometry.height <= 5) {
         const auto PMONITOR          = pWindow->m_pMonitor.lock();
         pWindow->m_vLastFloatingSize = PMONITOR->vecSize / 2.f;
     } else