diff --git a/apps/operator/components/NewTenantModal.vue b/apps/operator/components/NewTenantModal.vue
new file mode 100644
index 0000000..26e4602
--- /dev/null
+++ b/apps/operator/components/NewTenantModal.vue
@@ -0,0 +1,265 @@
+<script setup lang="ts">
+// "New tenant" modal — opens from the Tenants page header. Collects the
+// minimum needed to create a tenant (slug + name + plan + optional primary
+// domain); billing details, status changes, and provisioning are edited from
+// the tenant detail page after creation.
+
+import type { Tenant, TenantPlan } from '~/types/tenant'
+
+const props = defineProps<{ open: boolean }>()
+const emit = defineEmits<{ close: []; created: [Tenant] }>()
+
+const slug = ref('')
+const name = ref('')
+const plan = ref<TenantPlan>('mvp')
+const domain = ref('')
+const slugTouched = ref(false)
+const error = ref<string | null>(null)
+const busy = ref(false)
+
+const PLANS: TenantPlan[] = ['mvp', 'pro', 'enterprise']
+
+// Reset every time the modal opens so previous attempts don't linger.
+watch(
+  () => props.open,
+  (v) => {
+    if (v) {
+      slug.value = ''
+      name.value = ''
+      plan.value = 'mvp'
+      domain.value = ''
+      slugTouched.value = false
+      error.value = null
+      busy.value = false
+    }
+  },
+)
+
+// Auto-derive slug from name until the operator types in the slug field
+// themselves — once they touch slug we never overwrite it.
+watch(name, (next) => {
+  if (slugTouched.value) return
+  slug.value = next
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, '-')
+    .replace(/^-+|-+$/g, '')
+    .slice(0, 40)
+})
+
+onMounted(() => {
+  const onKey = (e: KeyboardEvent) => {
+    if (e.key === 'Escape' && props.open && !busy.value) emit('close')
+  }
+  document.addEventListener('keydown', onKey)
+  onBeforeUnmount(() => document.removeEventListener('keydown', onKey))
+})
+
+// Mirrors the platform-api CreateTenantDto validators so we don't fire a
+// doomed POST. Backend re-checks on submit.
+const slugValid = computed(() =>
+  /^[a-z0-9]([a-z0-9-]{0,38}[a-z0-9])?$/.test(slug.value.trim()),
+)
+const nameValid = computed(() => name.value.trim().length >= 2 && name.value.trim().length <= 120)
+const domainValid = computed(() => {
+  const d = domain.value.trim()
+  return d.length === 0 || /^[a-z0-9.-]+\.[a-z]{2,}$/i.test(d)
+})
+const canSubmit = computed(
+  () => !busy.value && slugValid.value && nameValid.value && domainValid.value,
+)
+
+async function submit() {
+  if (!canSubmit.value) return
+  busy.value = true
+  error.value = null
+  const d = domain.value.trim()
+  try {
+    const created = await $fetch<Tenant>('/api/tenants', {
+      method: 'POST',
+      body: {
+        slug: slug.value.trim(),
+        name: name.value.trim(),
+        plan: plan.value,
+        ...(d ? { domains: [d] } : {}),
+      },
+    })
+    emit('created', created)
+  } catch (e) {
+    const err = e as { data?: { data?: { message?: string }; message?: string; statusMessage?: string } }
+    error.value =
+      err.data?.data?.message ||
+      err.data?.message ||
+      err.data?.statusMessage ||
+      'Create failed'
+  } finally {
+    busy.value = false
+  }
+}
+</script>
+
+<template>
+  <Teleport to="body">
+    <div v-if="open" class="backdrop" @click="!busy && emit('close')">
+      <div class="modal" role="dialog" aria-label="New tenant" @click.stop>
+        <header>
+          <div>
+            <Eyebrow>Customers</Eyebrow>
+            <h2>New tenant</h2>
+          </div>
+          <button class="x" type="button" aria-label="Close" :disabled="busy" @click="emit('close')">
+            <UiIcon name="x" :size="12" />
+          </button>
+        </header>
+
+        <div class="body">
+          <section>
+            <label class="label">Name</label>
+            <input v-model="name" type="text" placeholder="Acme ApS" :disabled="busy" />
+          </section>
+          <section>
+            <label class="label">Slug</label>
+            <input
+              v-model="slug"
+              type="text"
+              placeholder="acme"
+              :disabled="busy"
+              @input="slugTouched = true"
+            />
+            <Mono dim>lowercase · 2–40 chars · a–z, 0–9, hyphens · stable URL key</Mono>
+          </section>
+          <section>
+            <label class="label">Plan</label>
+            <div class="seg three">
+              <button
+                v-for="p in PLANS"
+                :key="p"
+                type="button"
+                :class="{ on: plan === p }"
+                :disabled="busy"
+                @click="plan = p"
+              >{{ p }}</button>
+            </div>
+          </section>
+          <section>
+            <label class="label">Primary domain <span class="hint">(optional)</span></label>
+            <input v-model="domain" type="text" placeholder="acme.example.com" :disabled="busy" />
+            <Mono dim>can be added later from the tenant detail page</Mono>
+          </section>
+
+          <p v-if="error" class="err">{{ error }}</p>
+        </div>
+
+        <footer>
+          <UiButton variant="ghost" :disabled="busy" @click="emit('close')">Cancel</UiButton>
+          <UiButton variant="primary" :disabled="!canSubmit" @click="submit">
+            {{ busy ? 'Creating…' : 'Create tenant' }}
+          </UiButton>
+        </footer>
+      </div>
+    </div>
+  </Teleport>
+</template>
+
+<style scoped>
+.backdrop {
+  position: fixed; inset: 0;
+  background: rgba(0, 0, 0, 0.55);
+  display: flex; align-items: center; justify-content: center;
+  padding: 24px;
+  z-index: 180;
+}
+.modal {
+  width: 100%; max-width: 480px;
+  background: var(--elevated);
+  border: 1px solid var(--border);
+  border-radius: 10px;
+  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
+  display: flex; flex-direction: column;
+  overflow: hidden;
+}
+header {
+  padding: 16px 20px;
+  display: flex; justify-content: space-between; align-items: flex-start;
+  border-bottom: 1px solid var(--border);
+}
+h2 { margin: 4px 0 0 0; font-family: var(--font-display); font-weight: 600; font-size: 18px; }
+.x {
+  width: 26px; height: 26px;
+  border: 0; border-radius: 6px; background: transparent;
+  color: var(--text-mute); cursor: pointer;
+  display: inline-flex; align-items: center; justify-content: center;
+}
+.x:hover:not(:disabled) { background: var(--surface); color: var(--text); }
+.x:disabled { opacity: 0.4; cursor: not-allowed; }
+
+.body { padding: 16px 20px; display: flex; flex-direction: column; gap: 14px; }
+section { display: flex; flex-direction: column; gap: 6px; }
+.label {
+  font-family: var(--font-mono);
+  font-size: 10px;
+  letter-spacing: 0.12em;
+  text-transform: uppercase;
+  color: var(--text-mute);
+  font-weight: 500;
+}
+.label .hint { color: var(--text-mute); font-weight: 400; text-transform: none; letter-spacing: 0; }
+input {
+  height: 34px;
+  padding: 0 12px;
+  background: var(--input-bg);
+  border: 1px solid var(--border);
+  color: var(--text);
+  border-radius: 6px;
+  font-family: inherit;
+  font-size: 13px;
+  outline: 0;
+}
+input:focus { border-color: var(--border-hi); }
+input:disabled { opacity: 0.6; }
+
+.seg {
+  display: grid;
+  width: 100%;
+  gap: 2px;
+  padding: 2px;
+  background: var(--surface);
+  border: 1px solid var(--border);
+  border-radius: 7px;
+  box-sizing: border-box;
+}
+.seg.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
+.seg button {
+  appearance: none;
+  border: 0;
+  background: transparent;
+  color: var(--text-dim);
+  font-family: inherit;
+  font-size: 11px;
+  font-weight: 500;
+  padding: 6px 10px;
+  border-radius: 5px;
+  cursor: pointer;
+}
+.seg button:hover:not(:disabled) { color: var(--text); }
+.seg button.on { background: var(--text); color: var(--bg); }
+.seg button:disabled { opacity: 0.5; cursor: not-allowed; }
+
+.err {
+  margin: 0;
+  padding: 10px 12px;
+  background: rgba(240, 88, 88, 0.08);
+  border: 1px solid rgba(240, 88, 88, 0.24);
+  color: var(--bad);
+  border-radius: 6px;
+  font-size: 12px;
+}
+
+footer {
+  padding: 12px 20px;
+  display: flex;
+  justify-content: flex-end;
+  gap: 8px;
+  border-top: 1px solid var(--border);
+  background: var(--surface);
+}
+</style>
diff --git a/apps/operator/pages/tenants/index.vue b/apps/operator/pages/tenants/index.vue
index af0e371..1af703f 100644
--- a/apps/operator/pages/tenants/index.vue
+++ b/apps/operator/pages/tenants/index.vue
@@ -7,6 +7,16 @@ const { data: tenants, refresh, pending } = await useFetch<Tenant[]>('/api/tenan
 
 const search = ref('')
 const statusFilter = ref<'all' | TenantStatus>('all')
+const createOpen = ref(false)
+
+async function onCreated(tenant: Tenant) {
+  createOpen.value = false
+  // Refresh the list so the new row appears immediately, then jump into the
+  // detail page — that's where the operator will configure domains, billing,
+  // and trigger provisioning.
+  await refresh()
+  await navigateTo(`/tenants/${tenant.slug}`)
+}
 
 const filtered = computed(() => {
   const q = search.value.trim().toLowerCase()
@@ -50,13 +60,15 @@ function navTo(t: Tenant) {
           <template #leading><UiIcon name="refresh" :size="13" /></template>
           Refresh
         </UiButton>
-        <UiButton variant="primary">
+        <UiButton variant="primary" @click="createOpen = true">
           <template #leading><UiIcon name="plus" :size="13" /></template>
           New tenant
         </UiButton>
       </template>
     </PageHeader>
 
+    <NewTenantModal :open="createOpen" @close="createOpen = false" @created="onCreated" />
+
     <div class="stage">
       <div class="filters">
         <div class="search">
diff --git a/apps/operator/server/api/tenants/index.post.ts b/apps/operator/server/api/tenants/index.post.ts
new file mode 100644
index 0000000..5099f2e
--- /dev/null
+++ b/apps/operator/server/api/tenants/index.post.ts
@@ -0,0 +1,6 @@
+import { platformApi } from '~~/server/utils/platform-api'
+
+export default defineEventHandler(async (event) => {
+  const body = await readBody(event)
+  return platformApi(event, '/tenants', { method: 'POST', body })
+})