diff --git a/__tests__/notifications-logic.test.ts b/__tests__/notifications-logic.test.ts
index e3a7117..16d0228 100644
--- a/__tests__/notifications-logic.test.ts
+++ b/__tests__/notifications-logic.test.ts
@@ -10,6 +10,8 @@ import {
   renderBookingEmail,
   classDedupeKey,
   renderClassEmail,
+  formDedupeKey,
+  renderFormEmail,
 } from '@/lib/notifications-logic'
 
 describe('isTerminalAttempt', () => {
@@ -309,3 +311,75 @@ describe('renderClassEmail', () => {
     expect(r.html).toContain('<b>x</b>')
   })
 })
+
+describe('formDedupeKey', () => {
+  it('submitter confirmation is one row per submission', () => {
+    expect(formDedupeKey('form_submission_received', { submissionId: 's1' })).toBe(
+      'form_submission_received:s1',
+    )
+  })
+  it('admin alert fans out one row per (submission, admin)', () => {
+    expect(
+      formDedupeKey('form_submission_admin', { submissionId: 's1', adminMemberId: 'a1' }),
+    ).toBe('form_submission_admin:s1:a1')
+    expect(
+      formDedupeKey('form_submission_admin', { submissionId: 's1', adminMemberId: 'a1' }),
+    ).not.toBe(
+      formDedupeKey('form_submission_admin', { submissionId: 's1', adminMemberId: 'a2' }),
+    )
+  })
+})
+
+describe('renderFormEmail', () => {
+  it('submitter received: thank-you subject + body', () => {
+    const r = renderFormEmail({
+      type: 'form_submission_received',
+      spaceName: 'Acme',
+      recipientName: 'Ada',
+      formTitle: 'Liability Waiver',
+      manageUrl: 'https://x.test/me',
+    })
+    expect(r.subject).toBe('Received: Liability Waiver at Acme')
+    expect(r.text).toContain('Hi Ada,')
+    expect(r.text).toContain('received your submission to Liability Waiver at Acme')
+    expect(r.text).toContain('https://x.test/me')
+  })
+
+  it('admin alert: subject names the form; body names the submitter and the link goes to the results URL', () => {
+    const r = renderFormEmail({
+      type: 'form_submission_admin',
+      spaceName: 'Acme',
+      recipientName: 'Boss',
+      formTitle: 'Liability Waiver',
+      manageUrl: 'https://x.test/forms/abc/results',
+      submitterLabel: 'Ada Lovelace',
+    })
+    expect(r.subject).toBe('New submission: Liability Waiver at Acme')
+    expect(r.text).toContain('Ada Lovelace submitted Liability Waiver at Acme')
+    expect(r.text).toContain('https://x.test/forms/abc/results')
+  })
+
+  it('admin alert: falls back to "someone" when submitterLabel is missing', () => {
+    const r = renderFormEmail({
+      type: 'form_submission_admin',
+      spaceName: 'Acme',
+      formTitle: 'Liability Waiver',
+      manageUrl: 'https://x.test/forms/abc/results',
+    })
+    expect(r.text.toLowerCase()).toContain('someone submitted')
+  })
+
+  it('escapes HTML in form title and submitter label', () => {
+    const r = renderFormEmail({
+      type: 'form_submission_admin',
+      spaceName: 'Acme',
+      formTitle: '<script>',
+      manageUrl: 'https://x.test/forms/abc/results',
+      submitterLabel: '<img>',
+    })
+    expect(r.html).not.toContain('<script>')
+    expect(r.html).not.toContain('<img>')
+    expect(r.html).toContain('&lt;script&gt;')
+    expect(r.html).toContain('&lt;img&gt;')
+  })
+})
diff --git a/lib/actions/forms.ts b/lib/actions/forms.ts
index e6d91c6..9f5126e 100644
--- a/lib/actions/forms.ts
+++ b/lib/actions/forms.ts
@@ -34,6 +34,13 @@ import {
   pickMemberForEmail,
   deriveSubmitterEmail,
 } from '@/lib/forms-logic'
+import { renderFormEmail, formDedupeKey } from '@/lib/notifications-logic'
+import {
+  enqueueNotification,
+  resolveMemberContact,
+  getSpaceName,
+  buildManageUrl,
+} from '@/lib/notifications/enqueue'
 
 // Associate prior unlinked submissions in a space with a member by email
 // (case-insensitive, ILIKE-escaped so `_`/`%` in an address are literal).
@@ -439,7 +446,7 @@ export async function submitForm(input: unknown) {
   const admin = createAdminClient()
   const { data: form } = await admin
     .from('forms')
-    .select('id, space_id, slug, kind, visibility, status, schema, legal_text, version')
+    .select('id, space_id, slug, title, kind, visibility, status, schema, legal_text, version')
     .eq('id', body.formId)
     .maybeSingle()
   if (!form) return { error: 'Form not found' }
@@ -516,19 +523,23 @@ export async function submitForm(input: unknown) {
   }
 
   const h = await headers()
-  const { error: insErr } = await admin.from('form_submissions').insert({
-    form_id: form.id,
-    space_id: form.space_id,
-    member_id: linkedMemberId,
-    submitter_email: submitterEmail,
-    answers: answers.value,
-    form_snapshot: form.schema,
-    legal_text_snapshot: form.legal_text ?? null,
-    form_version: form.version,
-    ip: parseClientIp(h.get('x-forwarded-for'), h.get('x-real-ip')),
-    user_agent: h.get('user-agent'),
-  })
-  if (insErr) return { error: insErr.message }
+  const { data: submission, error: insErr } = await admin
+    .from('form_submissions')
+    .insert({
+      form_id: form.id,
+      space_id: form.space_id,
+      member_id: linkedMemberId,
+      submitter_email: submitterEmail,
+      answers: answers.value,
+      form_snapshot: form.schema,
+      legal_text_snapshot: form.legal_text ?? null,
+      form_version: form.version,
+      ip: parseClientIp(h.get('x-forwarded-for'), h.get('x-real-ip')),
+      user_agent: h.get('user-agent'),
+    })
+    .select('id')
+    .single()
+  if (insErr || !submission) return { error: insErr?.message ?? 'Submission failed' }
 
   // Advisory audit. No member context for anon submitters, so write directly.
   await admin.from('activity_log').insert({
@@ -541,9 +552,107 @@ export async function submitForm(input: unknown) {
     details: form.slug,
   })
 
+  // Notifications (best-effort, never throws into this action):
+  // 1. Submitter confirmation: ONLY when the submitter is authenticated
+  //    (members or public_auth). Recipient is the verified auth email, not
+  //    body.email. Anonymous public submissions skip the confirmation, since
+  //    a typed email could belong to anyone and confirming to it would be a
+  //    spam vector.
+  // 2. Admin alert: one row per member who holds forms.manage in the space
+  //    (the same gate forms-guard / forms RLS use). Dedupe by (submission,
+  //    admin) so a replay is a no-op.
+  try {
+    const submissionId = submission.id as string
+    const spaceName = await getSpaceName(admin, form.space_id)
+    const formTitle = (form.title as string | null) ?? form.slug ?? ''
+
+    if (user?.email) {
+      const recipientEmail = user.email.toLowerCase()
+      const recipientName = linkedMemberId
+        ? (await resolveMemberContact(admin, form.space_id, linkedMemberId))?.displayName ?? null
+        : null
+      const { subject, html, text } = renderFormEmail({
+        type: 'form_submission_received',
+        spaceName,
+        recipientName,
+        formTitle,
+        manageUrl: buildManageUrl(null),
+      })
+      await enqueueNotification(admin, {
+        spaceId: form.space_id,
+        memberId: linkedMemberId,
+        type: 'form_submission_received',
+        recipient: recipientEmail,
+        subject,
+        bodyHtml: html,
+        bodyText: text,
+        dedupeKey: formDedupeKey('form_submission_received', { submissionId }),
+      })
+    }
+
+    const { data: admins } = await admin.rpc('members_with_permission', {
+      sid: form.space_id,
+      perm: 'forms.manage',
+    })
+    const adminMemberIds = Array.from(
+      new Set(((admins ?? []) as Array<{ member_id: string }>).map(a => a.member_id)),
+    )
+    if (adminMemberIds.length > 0) {
+      const resultsUrl = `${process.env.NEXT_PUBLIC_APP_URL || 'https://hackerspace.sh'}/forms/${form.id}/results`
+      const submitterLabel = await deriveSubmitterLabel(admin, form.space_id, {
+        linkedMemberId,
+        submitterEmail,
+        userEmail: user?.email ?? null,
+      })
+      for (const adminMemberId of adminMemberIds) {
+        const contact = await resolveMemberContact(admin, form.space_id, adminMemberId)
+        if (!contact?.email) continue
+        const { subject, html, text } = renderFormEmail({
+          type: 'form_submission_admin',
+          spaceName,
+          recipientName: contact.displayName,
+          formTitle,
+          manageUrl: resultsUrl,
+          submitterLabel,
+        })
+        await enqueueNotification(admin, {
+          spaceId: form.space_id,
+          memberId: adminMemberId,
+          type: 'form_submission_admin',
+          recipient: contact.email,
+          subject,
+          bodyHtml: html,
+          bodyText: text,
+          dedupeKey: formDedupeKey('form_submission_admin', {
+            submissionId,
+            adminMemberId,
+          }),
+        })
+      }
+    }
+  } catch (e) {
+    console.error('[submitForm] notifications fan-out failed:', e instanceof Error ? e.message : e)
+  }
+
   return { success: true as const }
 }
 
+// Helper: how to label the submitter in an admin alert. Prefer the linked
+// member's display name (most informative); fall back to the typed/auth
+// email; fall back to "someone" for fully anonymous submissions where the
+// typed email is also missing. Best-effort: never throws.
+async function deriveSubmitterLabel(
+  admin: ReturnType<typeof createAdminClient>,
+  spaceId: string,
+  ids: { linkedMemberId: string | null; submitterEmail: string | null; userEmail: string | null },
+): Promise<string> {
+  if (ids.linkedMemberId) {
+    const contact = await resolveMemberContact(admin, spaceId, ids.linkedMemberId)
+    if (contact?.displayName) return contact.displayName
+  }
+  return ids.userEmail || ids.submitterEmail || 'someone'
+}
+
 /**
  * Public read for the /f/[slug] page. Service client (anon has no grant on
  * `forms`). Returns only a published form and only public-safe columns.
diff --git a/lib/notifications-logic.ts b/lib/notifications-logic.ts
index 78685ea..6afebe9 100644
--- a/lib/notifications-logic.ts
+++ b/lib/notifications-logic.ts
@@ -278,6 +278,65 @@ export function renderClassEmail(input: ClassEmailInput): RenderedEmail {
   return { subject, html, text }
 }
 
+// ─── Form submission ─────────────────────────────────────────────────────────
+
+export type FormNotificationType = 'form_submission_received' | 'form_submission_admin'
+
+// Submitter confirmation is one row per submission. Admin fan-out is one row
+// per (submission, admin) so each admin's email is independent.
+export function formDedupeKey(
+  type: FormNotificationType,
+  ids: { submissionId: string; adminMemberId?: string | null },
+): string {
+  if (type === 'form_submission_admin') {
+    return notificationDedupeKey([type, ids.submissionId, ids.adminMemberId])
+  }
+  return notificationDedupeKey([type, ids.submissionId])
+}
+
+export type FormEmailInput = {
+  type: FormNotificationType
+  spaceName: string
+  recipientName?: string | null
+  formTitle: string
+  // For the submitter confirmation, the link goes to /me. For admin alerts,
+  // pass the /forms/<id>/results URL so the admin lands on the result.
+  manageUrl: string
+  // Admin-only: name (or generic) of the person who submitted, to give
+  // context. For submitter confirmation this is unused. Always optional.
+  submitterLabel?: string | null
+}
+
+export function renderFormEmail(input: FormEmailInput): RenderedEmail {
+  const space = input.spaceName || 'your hackerspace'
+  const name = input.recipientName?.trim() || null
+  const greeting = name ? `Hi ${name},` : 'Hi,'
+  const form = input.formTitle || 'the form'
+
+  let subject: string
+  const lines: string[] = [greeting, '']
+
+  if (input.type === 'form_submission_received') {
+    subject = `Received: ${form} at ${space}`
+    lines.push(
+      `We received your submission to ${form} at ${space}. Thanks.`,
+      '',
+      `Manage your account: ${input.manageUrl}`,
+    )
+  } else {
+    subject = `New submission: ${form} at ${space}`
+    const who = (input.submitterLabel || '').trim() || 'someone'
+    lines.push(
+      `${who} submitted ${form} at ${space}.`,
+      '',
+      `View the submission: ${input.manageUrl}`,
+    )
+  }
+
+  const { html, text } = renderShell(lines)
+  return { subject, html, text }
+}
+
 // ─── Booking (equipment reservation) ─────────────────────────────────────────
 
 export type BookingNotificationType = 'booking_confirmed' | 'booking_cancelled'
diff --git a/scripts/047_members_with_permission.sql b/scripts/047_members_with_permission.sql
new file mode 100644
index 0000000..80edf52
--- /dev/null
+++ b/scripts/047_members_with_permission.sql
@@ -0,0 +1,37 @@
+-- =============================================================================
+-- 047: members_with_permission helper (Product spine Phase 4 notifications)
+-- =============================================================================
+-- The dues outbox is member-keyed: one recipient per row. The new form-
+-- submission "admin alert" fans out: one outbox row per recipient member who
+-- holds a given permission (e.g. forms.manage). Today the only available
+-- function is user_has_permission(uid, sid, perm): a per-user check. Iterating
+-- it across every member of a space would be N round-trips for every form
+-- submit -- bad latency, bad scaling.
+--
+-- members_with_permission(sid, perm) is the inverted, set-returning version of
+-- user_has_permission. Same membership-status gate (current/late only, mirrors
+-- migration 046), same admin-shortcut, same space_role_permissions +
+-- user_effective_roles fallback. Additive: it adds nothing to RLS surface,
+-- introduces no new tables/policies, and existing callers continue to use
+-- user_has_permission unchanged.
+--
+-- Idempotent: CREATE OR REPLACE. Apply as-is (Supabase SQL editor / psql);
+-- re-runs are no-ops.
+-- =============================================================================
+
+CREATE OR REPLACE FUNCTION public.members_with_permission(sid uuid, perm text)
+  RETURNS TABLE(member_id uuid) LANGUAGE sql STABLE SECURITY DEFINER SET search_path = public
+AS $$
+  SELECT sm.id
+  FROM public.space_members sm
+  WHERE sm.space_id = sid
+    AND sm.status IN ('current','late')   -- privilege-eligible only, mirrors 046
+    AND (
+      sm.role = 'admin'                    -- admins always pass (matches user_has_permission)
+      OR EXISTS (
+        SELECT 1 FROM public.space_role_permissions p
+        WHERE p.space_id = sid AND p.permission = perm
+          AND p.subject IN (SELECT public.user_effective_roles(sm.user_id, sid))
+      )
+    );
+$$;
diff --git a/scripts/schema.sql b/scripts/schema.sql
index 96ac61f..5701fff 100644
--- a/scripts/schema.sql
+++ b/scripts/schema.sql
@@ -1769,6 +1769,29 @@ AS $$
      );
 $$;
 
+-- Inverted, set-returning form of user_has_permission: which members in this
+-- space hold the named permission? Same membership-status gate (current/late,
+-- mirrors 046), same admin-shortcut, same space_role_permissions +
+-- user_effective_roles fallback. Used by notification fan-outs (e.g. the
+-- forms.manage admin alert) where N user_has_permission calls would be N
+-- round-trips. Equivalent to scripts/047_members_with_permission.sql.
+CREATE OR REPLACE FUNCTION public.members_with_permission(sid uuid, perm text)
+  RETURNS TABLE(member_id uuid) LANGUAGE sql STABLE SECURITY DEFINER SET search_path = public
+AS $$
+  SELECT sm.id
+  FROM public.space_members sm
+  WHERE sm.space_id = sid
+    AND sm.status IN ('current','late')
+    AND (
+      sm.role = 'admin'
+      OR EXISTS (
+        SELECT 1 FROM public.space_role_permissions p
+        WHERE p.space_id = sid AND p.permission = perm
+          AND p.subject IN (SELECT public.user_effective_roles(sm.user_id, sid))
+      )
+    );
+$$;
+
 ALTER TABLE public.space_role_permissions ENABLE ROW LEVEL SECURITY;
 ALTER TABLE public.ops_acl                ENABLE ROW LEVEL SECURITY;
 DROP POLICY IF EXISTS role_perms_select ON public.space_role_permissions;
diff --git a/types/database.ts b/types/database.ts
index b944bb1..fa25232 100644
--- a/types/database.ts
+++ b/types/database.ts
@@ -1674,6 +1674,10 @@ export type Database = {
         Args: { uid: string; sid: string; perm: string }
         Returns: boolean
       }
+      members_with_permission: {
+        Args: { sid: string; perm: string }
+        Returns: { member_id: string }[]
+      }
     }
     Enums: {
       area_lead_status: "active" | "vacant" | "handoff"