diff --git a/builder/op.go b/builder/op.go
index a728acd..2748fdf 100644
--- a/builder/op.go
+++ b/builder/op.go
@@ -124,7 +124,16 @@ func (u unaryExp) WriteSQL(sb *SQLBuilder) {
 		sb.WriteString(u.prefix)
 		sb.WriteRune(' ')
 	}
+
+	_, needsParens := u.exp.(junctionExp)
+	if needsParens {
+		sb.WriteRune('(')
+	}
 	u.exp.WriteSQL(sb)
+	if needsParens {
+		sb.WriteRune(')')
+	}
+
 	if u.suffix != "" {
 		sb.WriteRune(' ')
 		sb.WriteString(u.suffix)
diff --git a/root.go b/root.go
index 2b2d93f..056e555 100644
--- a/root.go
+++ b/root.go
@@ -65,6 +65,10 @@ func Or(exps ...builder.Exp) builder.Exp {
 	return builder.Or(exps...)
 }
 
+func Not(exp builder.Exp) builder.Exp {
+	return builder.Not(exp)
+}
+
 func Case(exp ...builder.Exp) builder.CaseBuilder {
 	return builder.Case(exp...)
 }
diff --git a/select_builder_test.go b/select_builder_test.go
index b957533..efd3e0d 100644
--- a/select_builder_test.go
+++ b/select_builder_test.go
@@ -858,6 +858,45 @@ func TestSelectBuilder_Where(t *testing.T) {
 			q,
 		)
 	})
+
+	t.Run("where with negated junction", func(t *testing.T) {
+		q := qrb.Select(qrb.N("*")).
+			From(qrb.N("accounts")).
+			Where(qrb.Not(qrb.And(
+				qrb.N("is_active").Eq(qrb.Bool(true)),
+				qrb.N("username").Eq(qrb.Arg("admin")),
+			)))
+
+		testhelper.AssertSQLWriterEquals(
+			t,
+			`
+			SELECT *
+			FROM accounts
+			WHERE NOT (is_active = true AND username = $1)
+			`,
+			[]any{"admin"},
+			q,
+		)
+	})
+
+	t.Run("where with negated comparison", func(t *testing.T) {
+		q := qrb.Select(qrb.N("*")).
+			From(qrb.N("accounts")).
+			Where(qrb.Not(
+				qrb.N("is_active").Eq(qrb.Bool(true)),
+			))
+
+		testhelper.AssertSQLWriterEquals(
+			t,
+			`
+			SELECT *
+			FROM accounts
+			WHERE NOT is_active = true
+			`,
+			nil,
+			q,
+		)
+	})
 }
 
 func TestSelectBuilder_GroupBy(t *testing.T) {