diff --git a/src/lib/error/minimum-one-environment-error.ts b/src/lib/error/minimum-one-environment-error.ts
new file mode 100644
index 0000000000..ea7804394e
--- /dev/null
+++ b/src/lib/error/minimum-one-environment-error.ts
@@ -0,0 +1,23 @@
+class MinimumOneEnvironmentError extends Error {
+    constructor(message: string) {
+        super();
+        Error.captureStackTrace(this, this.constructor);
+
+        this.name = this.constructor.name;
+        this.message = message;
+    }
+
+    toJSON(): object {
+        return {
+            isJoi: true,
+            name: this.constructor.name,
+            details: [
+                {
+                    message: this.message,
+                },
+            ],
+        };
+    }
+}
+export default MinimumOneEnvironmentError;
+module.exports = MinimumOneEnvironmentError;
diff --git a/src/lib/routes/util.ts b/src/lib/routes/util.ts
index 0d2ec2ce23..50dc5d12fd 100644
--- a/src/lib/routes/util.ts
+++ b/src/lib/routes/util.ts
@@ -54,6 +54,8 @@ export const handleErrors: (
             return res.status(400).json(error).end();
         case 'IncompatibleProjectError':
             return res.status(403).json(error).end();
+        case 'MinimumOneEnvironmentError':
+            return res.status(400).json(error).end();
         default:
             logger.error('Server failed executing request', error);
             return res.status(500).end();
diff --git a/src/lib/services/environment-service.ts b/src/lib/services/environment-service.ts
index 9a42a1e9ba..48c9ce91da 100644
--- a/src/lib/services/environment-service.ts
+++ b/src/lib/services/environment-service.ts
@@ -9,6 +9,8 @@ import NotFoundError from '../error/notfound-error';
 import { IEnvironmentStore } from '../types/stores/environment-store';
 import { IFeatureStrategiesStore } from '../types/stores/feature-strategies-store';
 import { IFeatureEnvironmentStore } from '../types/stores/feature-environment-store';
+import { IProjectStore } from 'lib/types/stores/project-store';
+import MinimumOneEnvironmentError from '../error/minimum-one-environment-error';
 
 export default class EnvironmentService {
     private logger: Logger;
@@ -17,6 +19,8 @@ export default class EnvironmentService {
 
     private featureStrategiesStore: IFeatureStrategiesStore;
 
+    private projectStore: IProjectStore;
+
     private featureEnvironmentStore: IFeatureEnvironmentStore;
 
     constructor(
@@ -24,11 +28,13 @@ export default class EnvironmentService {
             environmentStore,
             featureStrategiesStore,
             featureEnvironmentStore,
+            projectStore,
         }: Pick<
             IUnleashStores,
             | 'environmentStore'
             | 'featureStrategiesStore'
             | 'featureEnvironmentStore'
+            | 'projectStore'
         >,
         { getLogger }: Pick<IUnleashConfig, 'getLogger'>,
     ) {
@@ -36,6 +42,7 @@ export default class EnvironmentService {
         this.environmentStore = environmentStore;
         this.featureStrategiesStore = featureStrategiesStore;
         this.featureEnvironmentStore = featureEnvironmentStore;
+        this.projectStore = projectStore;
     }
 
     async getAll(): Promise<IEnvironment[]> {
@@ -91,13 +98,23 @@ export default class EnvironmentService {
         environment: string,
         projectId: string,
     ): Promise<void> {
-        await this.featureEnvironmentStore.disconnectFeatures(
-            environment,
+        const projectEnvs = await this.projectStore.getEnvironmentsForProject(
             projectId,
         );
-        await this.featureEnvironmentStore.disconnectProject(
-            environment,
-            projectId,
+
+        if (projectEnvs.length > 1) {
+            await this.featureEnvironmentStore.disconnectFeatures(
+                environment,
+                projectId,
+            );
+            await this.featureEnvironmentStore.disconnectProject(
+                environment,
+                projectId,
+            );
+            return;
+        }
+        throw new MinimumOneEnvironmentError(
+            'You must always have one active environment',
         );
     }
 }
diff --git a/src/test/e2e/api/admin/project/environments.e2e.test.ts b/src/test/e2e/api/admin/project/environments.e2e.test.ts
index 1aead68270..e1b96eb2bb 100644
--- a/src/test/e2e/api/admin/project/environments.e2e.test.ts
+++ b/src/test/e2e/api/admin/project/environments.e2e.test.ts
@@ -85,3 +85,20 @@ test('Should remove environment from project', async () => {
 
     expect(envs).toHaveLength(1);
 });
+
+test('Should not remove environment from project if project only has one environment enabled', async () => {
+    await app.request
+        .delete(`/api/admin/projects/default/environments/default`)
+        .expect(400)
+        .expect((r) => {
+            expect(r.body.details[0].message).toBe(
+                'You must always have one active environment',
+            );
+        });
+
+    const envs = await db.stores.projectStore.getEnvironmentsForProject(
+        'default',
+    );
+
+    expect(envs).toHaveLength(1);
+});
diff --git a/src/test/e2e/api/client/feature.env.disabled.e2e.test.ts b/src/test/e2e/api/client/feature.env.disabled.e2e.test.ts
index adb4fa5599..2985559f19 100644
--- a/src/test/e2e/api/client/feature.env.disabled.e2e.test.ts
+++ b/src/test/e2e/api/client/feature.env.disabled.e2e.test.ts
@@ -53,7 +53,12 @@ test('returns feature toggle for default env', async () => {
 });
 
 test('returns feature toggle for default env even if it is removed from project', async () => {
-    await app.services.environmentService.removeEnvironmentFromProject(
+    await db.stores.featureEnvironmentStore.disconnectFeatures(
+        'default',
+        'default',
+    );
+
+    await db.stores.featureEnvironmentStore.disconnectProject(
         'default',
         'default',
     );
diff --git a/src/test/e2e/services/environment-service.test.ts b/src/test/e2e/services/environment-service.test.ts
index 1d7b486e4e..aab32d1184 100644
--- a/src/test/e2e/services/environment-service.test.ts
+++ b/src/test/e2e/services/environment-service.test.ts
@@ -109,10 +109,11 @@ test('Adding same environment twice should throw a NameExistsError', async () =>
         name: 'uniqueness-test',
         type: 'production',
     });
+    await service.addEnvironmentToProject('uniqueness-test', 'default');
+
     await service.removeEnvironmentFromProject('test-connection', 'default');
     await service.removeEnvironmentFromProject('removal-test', 'default');
 
-    await service.addEnvironmentToProject('uniqueness-test', 'default');
     return expect(async () =>
         service.addEnvironmentToProject('uniqueness-test', 'default'),
     ).rejects.toThrow(