diff --git a/Framework/Indexing/inc/MantidIndexing/IndexSet.h b/Framework/Indexing/inc/MantidIndexing/IndexSet.h
index dfb3c25774aa69eeff63db6be74df21ebbca5295..91e88ca7a1dcd91e4bd05ebe10237cca5701dfba 100644
--- a/Framework/Indexing/inc/MantidIndexing/IndexSet.h
+++ b/Framework/Indexing/inc/MantidIndexing/IndexSet.h
@@ -91,6 +91,8 @@ public:
     return m_indices[index];
   }
 
+  bool isContiguous() const noexcept;
+
 protected:
   ~IndexSet() = default;
 
@@ -139,6 +141,21 @@ IndexSet<T>::IndexSet(const std::vector<size_t> &indices, size_t fullRange)
   m_size = m_indices.size();
 }
 
+/**
+ * Check if the index range is contiguous and in ascending order.
+ */
+template <class T>
+bool IndexSet<T>::isContiguous() const noexcept {
+  if (!m_isRange || m_indices.size() > 1) {
+    for (size_t i = 0; i < m_indices.size() - 1; ++i) {
+      if (m_indices[i] + 1 != m_indices[i + 1]) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
 } // namespace detail
 } // namespace Indexing
 } // namespace Mantid
diff --git a/Framework/Indexing/test/IndexSetTest.h b/Framework/Indexing/test/IndexSetTest.h
index 916f4429dd1990f9e9c9f9eccc7666c94cb2126b..a8b337d480d3d3d8ec2a2485ac0436fc5a276de3 100644
--- a/Framework/Indexing/test/IndexSetTest.h
+++ b/Framework/Indexing/test/IndexSetTest.h
@@ -137,6 +137,17 @@ public:
     TS_ASSERT_THROWS_NOTHING(--it2);
     TS_ASSERT_EQUALS(*it2, 0);
   }
+
+  void test_isContiguous() {
+    const IndexSetTester empty;
+    TS_ASSERT(empty.isContiguous())
+    const IndexSetTester range(3);
+    TS_ASSERT(range.isContiguous())
+    const IndexSetTester manualRange({3, 4, 5}, 6);
+    TS_ASSERT(manualRange.isContiguous())
+    IndexSetTester nonContiguous({2, 1, 3}, 4);
+    TS_ASSERT(!nonContiguous.isContiguous())
+  }
 };
 
 #endif /* MANTID_INDEXING_INDEXSETTEST_H_ */