diff --git a/.phase10-state.json b/.phase10-state.json
index f39a336..8e24fcc 100644
--- a/.phase10-state.json
+++ b/.phase10-state.json
@@ -1,8 +1,9 @@
 {
   "completed_features": [],
-  "current_feature": "customer-tags",
+  "current_feature": "project-templates",
   "started_at": "2026-05-23T06:10:51.530595",
   "attempted_features": [
-    "markdown-notes-time-entry"
+    "markdown-notes-time-entry",
+    "customer-tags"
   ]
 }
\ No newline at end of file
diff --git a/GENERATION_LOG.md b/GENERATION_LOG.md
index dec1b3f..5c283a3 100644
--- a/GENERATION_LOG.md
+++ b/GENERATION_LOG.md
@@ -1189,3 +1189,24 @@ src/index.ts(27,25): error TS2769: No overload matches this call.
   Overload 2 of 3, '(plugin: FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
     Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
       Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTy
+- `06:14:38` **INFO**   Committed feature customer-tags
+- `06:14:38` **INFO**   Pushed: rc=0
+
+## Phase-3 Feature: project-templates (2026-05-23 06:14:38)
+
+- `06:14:38` **INFO** Description: Wiederverwendbare Project-Templates (admin)
+- `06:14:38` **INFO**   Generating apps/api/src/db/schema.ts (ERWEITERT — füge `projectTemplates` Tabelle: id (uuid pk), name (text)…)
+- `06:15:07` **INFO**     wrote 3376 chars in 28.9s (attempt 1)
+- `06:15:07` **INFO**   Generating apps/api/src/routes/project-templates.ts (Fastify-Plugin /api/project-templates. CRUD, admin-only via preHandler…)
+- `06:15:29` **INFO**     wrote 2492 chars in 22.0s (attempt 1)
+- `06:15:29` **INFO**   Generating apps/web/src/pages/ProjectTemplates.tsx (ProjectTemplates-Page (admin-only). Liste + Create-Form (name, default…)
+- `06:16:19` **INFO**     wrote 6105 chars in 50.4s (attempt 1)
+- `06:16:19` **INFO** Running tsc --noEmit on api…
+- `06:16:21` **WARN**   tsc errors:
+src/index.ts(27,25): error TS2769: No overload matches this call.
+  Overload 1 of 3, '(plugin: FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTypeProvider>, opts: { ...; }, done: (err?: Error | undefined) => void): void'.
+  Overload 2 of 3, '(plugin: FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTy
diff --git a/apps/api/src/db/schema.ts b/apps/api/src/db/schema.ts
index c194cb0..7cced23 100644
--- a/apps/api/src/db/schema.ts
+++ b/apps/api/src/db/schema.ts
@@ -31,6 +31,14 @@ export const projects = pgTable("projects", {
   createdAt: timestamp("created_at").notNull().defaultNow()
 })
 
+export const projectTemplates = pgTable("project_templates", {
+  id: uuid("id").primaryKey().defaultRandom(),
+  name: text("name").notNull(),
+  defaultBillable: boolean("default_billable").notNull().default(true),
+  estimatedHours: integer("estimated_hours"),
+  createdAt: timestamp("created_at").notNull().defaultNow()
+})
+
 export const timeEntries = pgTable("time_entries", {
   id: uuid("id").primaryKey().defaultRandom(),
   userId: uuid("user_id").notNull().references(() => users.id, { onDelete: "cascade" }),
diff --git a/apps/api/src/routes/project-templates.ts b/apps/api/src/routes/project-templates.ts
new file mode 100644
index 0000000..4d6f2d5
--- /dev/null
+++ b/apps/api/src/routes/project-templates.ts
@@ -0,0 +1,98 @@
+import { FastifyInstance } from "fastify"
+import { db } from "../db"
+import { projectTemplates } from "../db/schema"
+import { eq } from "drizzle-orm"
+import { z } from "zod"
+
+const ProjectTemplateSchema = z.object({
+  name: z.string().min(1),
+  description: z.string().optional(),
+})
+
+const ProjectTemplateUpdateSchema = ProjectTemplateSchema.partial()
+
+export default async function projectTemplateRoutes(fastify: FastifyInstance) {
+  fastify.addHook("preHandler", async (request, reply) => {
+    try {
+      await request.jwtVerify()
+    } catch (err) {
+      return reply.code(401).send({ message: "Unauthorized" })
+    }
+
+    const user = request.user as any
+    if (user?.role !== "admin") {
+      return reply.code(403).send({ message: "Admin privileges required" })
+    }
+  })
+
+  fastify.get("/", async (request, reply) => {
+    const results = await db
+      .select()
+      .from(projectTemplates)
+      .orderBy(projectTemplates.name)
+
+    return results
+  })
+
+  fastify.get("/:id", async (request, reply) => {
+    const { id } = request.params as { id: string }
+
+    const [template] = await db
+      .select()
+      .from(projectTemplates)
+      .where(eq(projectTemplates.id, id))
+      .limit(1)
+
+    if (!template) {
+      return reply.code(404).send({ message: "Project template not found" })
+    }
+
+    return template
+  })
+
+  fastify.post("/", async (request, reply) => {
+    const body = ProjectTemplateSchema.parse(request.body)
+
+    const [template] = await db
+      .insert(projectTemplates)
+      .values({
+        name: body.name,
+        description: body.description,
+      })
+      .returning()
+
+    return reply.code(201).send(template)
+  })
+
+  fastify.patch("/:id", async (request, reply) => {
+    const { id } = request.params as { id: string }
+    const body = ProjectTemplateUpdateSchema.parse(request.body)
+
+    const [template] = await db
+      .update(projectTemplates)
+      .set(body)
+      .where(eq(projectTemplates.id, id))
+      .returning()
+
+    if (!template) {
+      return reply.code(404).send({ message: "Project template not found" })
+    }
+
+    return template
+  })
+
+  fastify.delete("/:id", async (request, reply) => {
+    const { id } = request.params as { id: string }
+
+    const [template] = await db
+      .delete(projectTemplates)
+      .where(eq(projectTemplates.id, id))
+      .returning()
+
+    if (!template) {
+      return reply.code(404).send({ message: "Project template not found" })
+    }
+
+    return reply.code(204).send()
+  })
+}
\ No newline at end of file
diff --git a/apps/web/src/pages/ProjectTemplates.tsx b/apps/web/src/pages/ProjectTemplates.tsx
new file mode 100644
index 0000000..ed18649
--- /dev/null
+++ b/apps/web/src/pages/ProjectTemplates.tsx
@@ -0,0 +1,144 @@
+import { useState } from "react"
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query"
+import { api } from "../lib/api"
+
+export default function ProjectTemplates() {
+  const queryClient = useQueryClient()
+  const [name, setName] = useState("")
+  const [defaultBillable, setDefaultBillable] = useState(true)
+  const [estimatedHours, setEstimatedHours] = useState<string>("")
+
+  const { data: templates, isLoading, isError } = useQuery({
+    queryKey: ["projectTemplates"],
+    queryFn: () => api.listProjectTemplates()
+  })
+
+  const createMutation = useMutation({
+    mutationFn: (payload: { name: string; defaultBillable: boolean; estimatedHours: number }) => 
+      api.createProjectTemplate(payload),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["projectTemplates"] })
+      setName("")
+      setDefaultBillable(true)
+      setEstimatedHours("")
+    }
+  })
+
+  const deleteMutation = useMutation({
+    mutationFn: (id: string) => api.deleteProjectTemplate(id),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["projectTemplates"] })
+    }
+  })
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault()
+    if (!name.trim()) return
+    createMutation.mutate({ 
+      name, 
+      defaultBillable, 
+      estimatedHours: parseFloat(estimatedHours) || 0 
+    })
+  }
+
+  if (isLoading) return <div className="p-6 text-gray-500">Loading templates...</div>
+  if (isError) return <div className="p-6 text-red-500">Error loading templates.</div>
+
+  return (
+    <div className="p-6 max-w-6xl mx-auto space-y-8">
+      <header>
+        <h1 className="text-2xl font-bold text-gray-900">Project Templates</h1>
+        <p className="text-gray-500">Define standard project configurations for quick setup</p>
+      </header>
+
+      <section className="bg-white p-6 rounded-lg border border-gray-200 shadow-sm">
+        <h2 className="text-lg font-semibold mb-4">Create New Template</h2>
+        <form onSubmit={handleSubmit} className="grid grid-cols-1 md:grid-cols-4 gap-4 items-end">
+          <div className="md:col-span-1">
+            <label className="block text-sm font-medium text-gray-700 mb-1">Template Name</label>
+            <input
+              type="text"
+              required
+              className="w-full px-3 py-2 border border-gray-300 rounded-md focus:ring-2 focus:ring-blue-500 outline-none"
+              value={name}
+              onChange={(e) => setName(e.target.value)}
+              placeholder="e.g. Standard Web Project"
+            />
+          </div>
+          <div>
+            <label className="block text-sm font-medium text-gray-700 mb-1">Est. Hours</label>
+            <input
+              type="number"
+              className="w-full px-3 py-2 border border-gray-300 rounded-md focus:ring-2 focus:ring-blue-500 outline-none"
+              value={estimatedHours}
+              onChange={(e) => setEstimatedHours(e.target.value)}
+              placeholder="0"
+            />
+          </div>
+          <div className="flex items-center h-10">
+            <input
+              type="checkbox"
+              id="billable"
+              className="w-4 h-4 text-blue-600 border-gray-300 rounded focus:ring-blue-500"
+              checked={defaultBillable}
+              onChange={(e) => setDefaultBillable(e.target.checked)}
+            />
+            <label htmlFor="billable" className="ml-2 text-sm font-medium text-gray-700">
+              Default Billable
+            </label>
+          </div>
+          <button
+            type="submit"
+            disabled={createMutation.isPending}
+            className="bg-blue-600 text-white px-4 py-2 rounded-md hover:bg-blue-700 transition-colors disabled:bg-blue-300 font-medium text-sm"
+          >
+            {createMutation.isPending ? "Saving..." : "Create Template"}
+          </button>
+        </form>
+      </section>
+
+      <section className="bg-white rounded-lg border border-gray-200 shadow-sm overflow-hidden">
+        <table className="w-full text-left border-collapse">
+          <thead className="bg-gray-50 border-b border-gray-200">
+            <tr>
+              <th className="px-6 py-3 text-xs font-semibold text-gray-500 uppercase tracking-wider">Name</th>
+              <th className="px-6 py-3 text-xs font-semibold text-gray-500 uppercase tracking-wider">Est. Hours</th>
+              <th className="px-6 py-3 text-xs font-semibold text-gray-500 uppercase tracking-wider">Billable</th>
+              <th className="px-6 py-3 text-xs font-semibold text-gray-500 uppercase tracking-wider text-right">Actions</th>
+            </tr>
+          </thead>
+          <tbody className="divide-y divide-gray-200">
+            {templates?.length === 0 && (
+              <tr>
+                <td colSpan={4} className="px-6 py-8 text-center text-gray-500">No templates found.</td>
+              </tr>
+            )}
+            {templates?.map((t) => (
+              <tr key={t.id} className="hover:bg-gray-50 transition-colors">
+                <td className="px-6 py-4 text-sm font-medium text-gray-900">{t.name}</td>
+                <td className="px-6 py-4 text-sm text-gray-600">{t.estimatedHours}h</td>
+                <td className="px-6 py-4 text-sm text-gray-600">
+                  {t.defaultBillable ? (
+                    <span className="px-2 py-1 text-xs font-medium bg-green-100 text-green-700 rounded-full">Yes</span>
+                  ) : (
+                    <span className="px-2 py-1 text-xs font-medium bg-gray-100 text-gray-600 rounded-full">No</span>
+                  )}
+                </td>
+                <td className="px-6 py-4 text-right">
+                  <button
+                    onClick={() => {
+                      if (confirm("Delete this template?")) deleteMutation.mutate(t.id)
+                    }}
+                    className="text-red-600 hover:text-red-800 text-sm font-medium"
+                  >
+                    Delete
+                  </button>
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      </section>
+    </div>
+  )
+}
\ No newline at end of file