diff --git a/eslint.config.ts b/eslint.config.ts
index a89102f8e0..c44c690f74 100644
--- a/eslint.config.ts
+++ b/eslint.config.ts
@@ -55,6 +55,7 @@ const polarConfig = defineConfig({
 			},
 		],
 		'local/import-style': 'error',
+		'local/no-literal-ns-in-t': 'error',
 	},
 })
 
diff --git a/eslintRules/index.ts b/eslintRules/index.ts
index 427b1eac92..c8f30e127c 100644
--- a/eslintRules/index.ts
+++ b/eslintRules/index.ts
@@ -1,9 +1,11 @@
 import importStyle from './import-style.js'
+import noLiteralNsInT from './no-literal-ns-in-t.js'
 
 export default {
 	rules: {
 		/* eslint-disable @typescript-eslint/naming-convention */
 		'import-style': importStyle,
+		'no-literal-ns-in-t': noLiteralNsInT,
 		/* eslint-enable @typescript-eslint/naming-convention */
 	},
 }
diff --git a/eslintRules/no-literal-ns-in-t.ts b/eslintRules/no-literal-ns-in-t.ts
new file mode 100644
index 0000000000..2ef1706305
--- /dev/null
+++ b/eslintRules/no-literal-ns-in-t.ts
@@ -0,0 +1,63 @@
+import type { Rule } from 'eslint'
+
+/**
+ * Enforces that the `ns` option in `t`/`$t` calls uses a constant identifier
+ * (e.g. `PluginId` or `CoreId`) instead of a hard-coded string literal.
+ *
+ * Bad:  `t(($) => $.key, { ns: 'filter' })`
+ * Good: `t(($) => $.key, { ns: PluginId })`
+ */
+const noLiteralNsInT: Rule.RuleModule = {
+	meta: {
+		type: 'suggestion',
+		docs: {
+			description:
+				'Enforce using `PluginId`/`CoreId` identifier instead of a string literal for the `ns` option in `t`/`$t` calls',
+		},
+		messages: {
+			useLiteralId:
+				'Use the `PluginId` (or `CoreId`) constant instead of the string literal "{{ ns }}" as the `ns` option.',
+		},
+		schema: [],
+	},
+	create(context) {
+		return {
+			/* eslint-disable @typescript-eslint/naming-convention */
+			CallExpression(node) {
+				const { callee } = node
+				if (
+					callee.type !== 'Identifier' ||
+					(callee.name !== 't' && callee.name !== '$t')
+				) {
+					return
+				}
+
+				for (const arg of node.arguments) {
+					if (arg.type !== 'ObjectExpression') {
+						continue
+					}
+
+					for (const prop of arg.properties) {
+						if (
+							prop.type === 'Property' &&
+							!prop.computed &&
+							((prop.key.type === 'Identifier' && prop.key.name === 'ns') ||
+								(prop.key.type === 'Literal' && prop.key.value === 'ns')) &&
+							prop.value.type === 'Literal' &&
+							typeof prop.value.value === 'string'
+						) {
+							context.report({
+								node: prop.value,
+								messageId: 'useLiteralId',
+								data: { ns: prop.value.value },
+							})
+						}
+					}
+				}
+			},
+			/* eslint-enable @typescript-eslint/naming-convention */
+		}
+	},
+}
+
+export default noLiteralNsInT
diff --git a/src/core/components/PolarContainer.ce.vue b/src/core/components/PolarContainer.ce.vue
index 12604cb575..4edf3d3c0c 100644
--- a/src/core/components/PolarContainer.ce.vue
+++ b/src/core/components/PolarContainer.ce.vue
@@ -50,6 +50,7 @@ import { useMoveHandleStore } from '../stores/moveHandle'
 import { loadKern } from '../utils/loadKern'
 import { teardownMarkers } from '../utils/map/setupMarkers'
 import { mapZoomOffset } from '../utils/mapZoomOffset'
+import { CoreId } from '../vuePlugins/i18next'
 import MoveHandle from './MoveHandle.ce.vue'
 import PolarMap from './PolarMap.ce.vue'
 import PolarMapOverlay from './PolarMapOverlay.ce.vue'
@@ -76,10 +77,10 @@ const overlay =
 
 const isMacOS = navigator.userAgent.indexOf('Mac') !== -1
 const noCommandOnZoom = useT(() =>
-	t(($) => $.overlay.noCommandOnZoom, { ns: 'core' })
+	t(($) => $.overlay.noCommandOnZoom, { ns: CoreId })
 )
 const noControlOnZoom = useT(() =>
-	t(($) => $.overlay.noControlOnZoom, { ns: 'core' })
+	t(($) => $.overlay.noControlOnZoom, { ns: CoreId })
 )
 
 function wheelEffect(event: WheelEvent) {
@@ -95,7 +96,7 @@ function wheelEffect(event: WheelEvent) {
 }
 
 const oneFingerPan = useT(() =>
-	t(($) => $.overlay.oneFingerPan, { ns: 'core' })
+	t(($) => $.overlay.oneFingerPan, { ns: CoreId })
 )
 let hammer: { destroy: () => void } | null = null
 function updateListeners() {
diff --git a/src/core/utils/checkServiceAvailability.ts b/src/core/utils/checkServiceAvailability.ts
index be63947c5f..329fa6eb34 100644
--- a/src/core/utils/checkServiceAvailability.ts
+++ b/src/core/utils/checkServiceAvailability.ts
@@ -9,6 +9,8 @@ import type {
 	ServiceAvailabilityCheck,
 } from '../types'
 
+import { CoreId } from '../vuePlugins/i18next'
+
 export function checkServiceAvailability(
 	configuration: MapConfiguration,
 	register: MasterportalApiServiceRegister
@@ -44,7 +46,7 @@ export function checkServiceAvailability(
 					if (statusCode !== 200) {
 						notifyUser('warning', () =>
 							t(($) => $.error.serviceUnavailable, {
-								ns: 'core',
+								ns: CoreId,
 								serviceId,
 								serviceName,
 							})
diff --git a/src/plugins/export/store.ts b/src/plugins/export/store.ts
index 921b120965..f14f2379c8 100644
--- a/src/plugins/export/store.ts
+++ b/src/plugins/export/store.ts
@@ -15,7 +15,7 @@ import { notifyUser } from '@/lib/notifyUser'
 
 import type { ExportFormat } from './types'
 
-import { EXPORT_FORMATS } from './types'
+import { EXPORT_FORMATS, PluginId } from './types'
 import { convertToPdf } from './utils/convertToPdf'
 import { CrossOriginMonkey } from './utils/CrossOriginMonkey'
 import { downloadAsImage } from './utils/downloadAsImage'
@@ -103,7 +103,7 @@ export const useExportStore = defineStore('plugins/export', () => {
 			console.error(error)
 			notifyUser('error', () =>
 				t(($) => $.error, {
-					ns: 'export',
+					ns: PluginId,
 				})
 			)
 			throw error
diff --git a/src/plugins/geoLocation/store.ts b/src/plugins/geoLocation/store.ts
index b8bfe69352..0a4ed4e47f 100644
--- a/src/plugins/geoLocation/store.ts
+++ b/src/plugins/geoLocation/store.ts
@@ -26,8 +26,11 @@ import { notifyUser } from '@/lib/notifyUser'
 import { passesBoundaryCheck } from '@/lib/passesBoundaryCheck'
 import { getTooltip } from '@/lib/tooltip'
 
-import type { PluginState, GeoLocationPluginOptions } from './types'
-
+import {
+	type PluginState,
+	type GeoLocationPluginOptions,
+	PluginId,
+} from './types'
 import { detectDeniedGeolocationEarly } from './utils/detectDeniedGeolocationEarly'
 import { getGeoLocationStyle } from './utils/olStyle'
 import { positionChanged } from './utils/positionChanged'
@@ -184,7 +187,7 @@ export const useGeoLocationStore = defineStore('plugins/geoLocation', () => {
 		notifyUser(
 			'error',
 			t(($) => $.button.locationAccessDenied, {
-				ns: 'geoLocation',
+				ns: PluginId,
 			})
 		)
 		console.error(error.message)
@@ -282,13 +285,13 @@ export const useGeoLocationStore = defineStore('plugins/geoLocation', () => {
 
 	function printPositioningFailed(boundaryErrorOccurred: boolean) {
 		if (boundaryErrorOccurred) {
-			const msg = t(($) => $.toast.boundaryError, { ns: 'geoLocation' })
+			const msg = t(($) => $.toast.boundaryError, { ns: PluginId })
 			notifyUser('error', msg)
 			console.error(msg)
 			return
 		}
 		const msg = t(($) => $.toast.notInBoundary, {
-			ns: 'geoLocation',
+			ns: PluginId,
 		})
 		notifyUser('info', msg, { timeout: 10000 })
 		// eslint-disable-next-line no-console
diff --git a/src/plugins/iconMenu/store.ts b/src/plugins/iconMenu/store.ts
index c4b7a88aab..16281c0968 100644
--- a/src/plugins/iconMenu/store.ts
+++ b/src/plugins/iconMenu/store.ts
@@ -11,7 +11,7 @@ import { type Component, computed, markRaw, ref } from 'vue'
 
 import { useCoreStore } from '@/core/stores'
 
-import type { Menu } from './types'
+import { PluginId, type Menu } from './types'
 
 /* eslint-disable tsdoc/syntax */
 /**
@@ -147,11 +147,11 @@ export const useIconMenuStore = defineStore('plugins/iconMenu', () => {
 				open.value = null
 			},
 			closeLabel: t(($) => $.mobileCloseButton, {
-				ns: 'iconMenu',
-				plugin: t(($) => $.hints[menu.plugin.id], { ns: 'iconMenu' }),
+				ns: PluginId,
+				plugin: t(($) => $.hints[menu.plugin.id], { ns: PluginId }),
 			}),
 			component: menu.plugin.component,
-			plugin: 'iconMenu',
+			plugin: PluginId,
 		})
 	}
 
diff --git a/src/plugins/pins/utils/isCoordinateInBoundaryLayer.ts b/src/plugins/pins/utils/isCoordinateInBoundaryLayer.ts
index fd116e680d..83f0ef8c18 100644
--- a/src/plugins/pins/utils/isCoordinateInBoundaryLayer.ts
+++ b/src/plugins/pins/utils/isCoordinateInBoundaryLayer.ts
@@ -8,6 +8,8 @@ import type { BoundaryOptions } from '@/core'
 import { notifyUser } from '@/lib/notifyUser'
 import { passesBoundaryCheck } from '@/lib/passesBoundaryCheck'
 
+import { PluginId } from '../types'
+
 /**
  * Checks if boundary layer conditions are met; returns false if not and
  * toasts to the user about why the action was blocked, if `toastAction` is
@@ -35,10 +37,10 @@ export async function isCoordinateInBoundaryLayer(
 	}
 
 	if (typeof boundaryCheckResult === 'symbol') {
-		notifyUser('error', () => t(($) => $.boundaryError, { ns: 'pins' }))
+		notifyUser('error', () => t(($) => $.boundaryError, { ns: PluginId }))
 		console.error('Checking boundary layer failed.')
 	} else {
-		notifyUser('info', () => t(($) => $.notInBoundary, { ns: 'pins' }))
+		notifyUser('info', () => t(($) => $.notInBoundary, { ns: PluginId }))
 		// eslint-disable-next-line no-console
 		console.info('Pin position outside of boundary layer:', coordinate)
 	}