diff --git a/src/app/api/team-project/user/route.ts b/src/app/api/team-project/user/route.ts
index fc16dff..9d41a2c 100644
--- a/src/app/api/team-project/user/route.ts
+++ b/src/app/api/team-project/user/route.ts
@@ -138,11 +138,60 @@ export async function PATCH(request: NextRequest) {
       });
     }
 
-    const updated = await prisma.project.update({
-      where: { id: projectId },
-      data: { status },
+    if (status !== ProjectStatus.CONCLUIDO) {
+      return buildResponse({
+        success: false,
+        message: MESSAGES.GENERAL.INVALID_DATA,
+        status: 400,
+        errors: ['O encerramento manual só permite status CONCLUIDO.'],
+      });
+    }
+
+    if (existing.ownerId !== session.user.id) {
+      return buildResponse({
+        success: false,
+        message: MESSAGES.AUTH.UNAUTHORIZED,
+        status: 403,
+        errors: ['Apenas o owner pode concluir este projeto.'],
+      });
+    }
+
+    if (existing.status !== ProjectStatus.EM_ANDAMENTO) {
+      return buildResponse({
+        success: false,
+        message: MESSAGES.GENERAL.INVALID_DATA,
+        status: 400,
+        errors: ['Projeto só pode ser concluído em status EM_ANDAMENTO.'],
+      });
+    }
+
+    const updated = await prisma.$transaction(async (tx) => {
+      const totalProjectStacks = await tx.projectStack.count({
+        where: { projectId },
+      });
+      const totalStackTaken = await tx.stackTaken.count({
+        where: { projectId },
+      });
+
+      if (totalProjectStacks === 0 || totalStackTaken < totalProjectStacks) {
+        return null;
+      }
+
+      return tx.project.update({
+        where: { id: projectId },
+        data: { status },
+      });
     });
 
+    if (!updated) {
+      return buildResponse({
+        success: false,
+        message: MESSAGES.GENERAL.INVALID_DATA,
+        status: 400,
+        errors: ['Todas as stacks devem estar assumidas para concluir.'],
+      });
+    }
+
     // se houver lógica de verificação pós-update
     await checkProjectStatus(projectId);
 
diff --git a/src/tests/unit/api/team-project/team-project-user-route.test.ts b/src/tests/unit/api/team-project/team-project-user-route.test.ts
index a412d45..6008aa3 100644
--- a/src/tests/unit/api/team-project/team-project-user-route.test.ts
+++ b/src/tests/unit/api/team-project/team-project-user-route.test.ts
@@ -3,19 +3,27 @@
  */
 
 import { GET, PATCH } from '@/app/api/team-project/user/route';
+import { MESSAGES } from '@/constants/messages';
 import { checkAuth } from '@/lib/check-auth';
 import { logger } from '@/lib/logger';
+import { checkProjectStatus } from '@/lib/check-project-status';
 import { prisma } from '@/lib/prisma';
+import { ProjectStatus } from '@prisma/client';
 import { NextRequest } from 'next/server';
 
 jest.mock('@/lib/prisma', () => ({
   prisma: {
+    $transaction: jest.fn(),
     project: {
       findMany: jest.fn(),
       findUnique: jest.fn(),
       update: jest.fn(),
     },
+    projectStack: {
+      count: jest.fn(),
+    },
     stackTaken: {
+      count: jest.fn(),
       findMany: jest.fn(),
     },
   },
@@ -29,21 +37,36 @@ jest.mock('@/lib/check-project-status', () => ({
   checkProjectStatus: jest.fn(),
 }));
 
+const projectId = 'project-123456789012345678';
+const ownerId = 'owner-1';
+
+const createRequest = (body: unknown) =>
+  ({
+    json: async () => body,
+  }) as NextRequest;
+
 jest.mock('@/lib/logger', () => ({
   logger: {
     error: jest.fn(),
   },
 }));
 
-const authorizeUser = () => {
+const authorizeUser = (id = ownerId, role = 'USER') => {
   (checkAuth as jest.Mock).mockResolvedValue({
     authorized: true,
     session: {
-      user: { id: 'user-1', role: 'USER' },
+      user: { id, role },
     },
   });
 };
 
+const mockProject = (overrides = {}) => ({
+  id: projectId,
+  ownerId,
+  status: ProjectStatus.EM_ANDAMENTO,
+  ...overrides,
+});
+
 describe('GET /api/team-project/user', () => {
   beforeEach(() => {
     jest.clearAllMocks();
@@ -72,35 +95,157 @@ describe('PATCH /api/team-project/user', () => {
   beforeEach(() => {
     jest.clearAllMocks();
     authorizeUser();
+
+    (prisma.project.findUnique as jest.Mock).mockResolvedValue(mockProject());
+    (prisma.projectStack as jest.Mock).count.mockResolvedValue(2);
+    (prisma.stackTaken.count as jest.Mock).mockResolvedValue(2);
+
+    (prisma.project.update as jest.Mock).mockResolvedValue(
+      mockProject({ status: ProjectStatus.CONCLUIDO })
+    );
+
+    (prisma.$transaction as jest.Mock).mockImplementation(async (callback) =>
+      callback(prisma)
+    );
+
+    (checkProjectStatus as jest.Mock).mockResolvedValue(null);
   });
 
-  it('deve registrar erro estruturado quando atualização falhar', async () => {
-    const projectId = '1234567890123456789012345';
+  it('conclui projeto quando owner, status e stacks são elegíveis', async () => {
+    const response = await PATCH(
+      createRequest({
+        id: projectId,
+        status: ProjectStatus.CONCLUIDO,
+      })
+    );
+
+    const body = await response.json();
+
+    expect(response.status).toBe(200);
+    expect(body.status).toBe(ProjectStatus.CONCLUIDO);
+
+    expect(prisma.$transaction).toHaveBeenCalledWith(expect.any(Function));
+
+    expect(prisma.project.update).toHaveBeenCalledWith({
+      where: { id: projectId },
+      data: { status: ProjectStatus.CONCLUIDO },
+    });
+
+    expect(checkProjectStatus).toHaveBeenCalledWith(projectId);
+  });
+
+  it('bloqueia conclusão quando usuário não é owner', async () => {
+    authorizeUser('user-2');
+
+    const response = await PATCH(
+      createRequest({
+        id: projectId,
+        status: ProjectStatus.CONCLUIDO,
+      })
+    );
+
+    const body = await response.json();
+
+    expect(response.status).toBe(403);
+
+    expect(body).toMatchObject({
+      success: false,
+      message: MESSAGES.AUTH.UNAUTHORIZED,
+    });
+
+    expect(prisma.project.update).not.toHaveBeenCalled();
+  });
+
+  it('bloqueia status diferente de CONCLUIDO', async () => {
+    const response = await PATCH(
+      createRequest({
+        id: projectId,
+        status: ProjectStatus.BUSCANDO,
+      })
+    );
+
+    const body = await response.json();
+
+    expect(response.status).toBe(400);
 
-    (prisma.project.findUnique as jest.Mock).mockResolvedValue({
-      id: projectId,
-      ownerId: 'user-1',
+    expect(body).toMatchObject({
+      success: false,
+      message: MESSAGES.GENERAL.INVALID_DATA,
     });
+
+    expect(prisma.project.update).not.toHaveBeenCalled();
+  });
+
+  it('bloqueia conclusão quando projeto não está EM_ANDAMENTO', async () => {
+    (prisma.project.findUnique as jest.Mock).mockResolvedValue(
+      mockProject({
+        status: ProjectStatus.BUSCANDO,
+      })
+    );
+
+    const response = await PATCH(
+      createRequest({
+        id: projectId,
+        status: ProjectStatus.CONCLUIDO,
+      })
+    );
+
+    const body = await response.json();
+
+    expect(response.status).toBe(400);
+
+    expect(body.errors).toContain(
+      'Projeto só pode ser concluído em status EM_ANDAMENTO.'
+    );
+
+    expect(prisma.project.update).not.toHaveBeenCalled();
+  });
+
+  it('bloqueia conclusão quando existem stacks não assumidas', async () => {
+    (prisma.projectStack.count as jest.Mock).mockResolvedValue(3);
+    (prisma.stackTaken.count as jest.Mock).mockResolvedValue(2);
+
+    const response = await PATCH(
+      createRequest({
+        id: projectId,
+        status: ProjectStatus.CONCLUIDO,
+      })
+    );
+
+    const body = await response.json();
+
+    expect(response.status).toBe(400);
+
+    expect(body.errors).toContain(
+      'Todas as stacks devem estar assumidas para concluir.'
+    );
+
+    expect(prisma.project.update).not.toHaveBeenCalled();
+  });
+
+  it('deve registrar erro estruturado quando atualização falhar', async () => {
     (prisma.project.update as jest.Mock).mockRejectedValue(
       new Error('Update failed')
     );
 
-    const request = {
-      json: async () => ({
+    const response = await PATCH(
+      createRequest({
         id: projectId,
-        status: 'CONCLUIDO',
-      }),
-    } as unknown as NextRequest;
+        status: ProjectStatus.CONCLUIDO,
+      })
+    );
 
-    const response = await PATCH(request);
     const body = await response.json();
 
     expect(response.status).toBe(500);
     expect(body.success).toBe(false);
+
     expect(logger.error).toHaveBeenCalledWith(
       'Erro ao alterar status do projeto',
       'PATCH /api/team-project/user',
-      { error: 'Update failed' }
+      {
+        error: 'Update failed',
+      }
     );
   });
 });