diff --git a/tests/test_content.py b/tests/test_content.py
index 070e2be..e0f3eb7 100644
--- a/tests/test_content.py
+++ b/tests/test_content.py
@@ -268,3 +268,24 @@ def test_search_verification_meta(client, monkeypatch):
     for b in (seo, home):
         assert '<meta name="google-site-verification" content="gtok123">' in b
         assert '<meta name="msvalidate.01" content="btok456">' in b
+
+
+# The brand lockup is the site-wide "go home" affordance. The static tool pages
+# and the Jinja pages build their headers separately, so this is easy to add to
+# one and forget on the other — assert every page carries it.
+BRAND_PAGES = ["/", "/calendar", "/day", "/compare", "/legend", "/alerts",
+               "/about", "/privacy", "/climate", "/glossary"]
+
+
+@pytest.mark.parametrize("path", BRAND_PAGES)
+def test_brand_lockup_links_home(client, path):
+    html = client.get(f"{B}{path}").text
+    brand = html.split('<div class="brand">', 1)[1].split("</header>", 1)[0]
+    head = brand.split("</h1>")[0] if "<h1" in brand else brand.split("</p>")[0]
+    # The link must wrap the whole lockup, so clicking the mark works too, not
+    # just the word.
+    assert "<a href=" in head, f"{path}: brand is not a link"
+    href = head.split('<a href="', 1)[1].split('"', 1)[0]
+    assert href in ("./", f"{B}/"), f"{path}: brand links to {href!r}, not home"
+    assert '<span class="logo">' in head.split("<a href=", 1)[1], \
+        f"{path}: the mark sits outside the home link"