diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b9da1aa..0586c6ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- [#338](https://github.com/JsonApiClient/json_api_client/pull/338) - implement hash and eql? for builder class
 - [#351](https://github.com/JsonApiClient/json_api_client/pull/351) - Remove rudimental `last_result_set` relationship from serializer
 
 ## 1.13.0
diff --git a/lib/json_api_client/query/builder.rb b/lib/json_api_client/query/builder.rb
index 7799e67c..0740bbb5 100644
--- a/lib/json_api_client/query/builder.rb
+++ b/lib/json_api_client/query/builder.rb
@@ -109,6 +109,20 @@ def method_missing(method_name, *args, &block)
         to_a.send(method_name, *args, &block)
       end
 
+      def hash
+        [
+          klass,
+          params
+        ].hash
+      end
+
+      def ==(other)
+        return false unless other.is_a?(self.class)
+
+        hash == other.hash
+      end
+      alias_method :eql?, :==
+
       protected
 
       def _fetch
diff --git a/test/unit/query_builder_test.rb b/test/unit/query_builder_test.rb
index 87a6233e..4fdeaa29 100644
--- a/test/unit/query_builder_test.rb
+++ b/test/unit/query_builder_test.rb
@@ -312,4 +312,24 @@ def test_build_propagate_only_path_params
     assert_equal '123', record.author_id
     assert_equal [], record.relationships.changed
   end
+
+  def test_build_hash_sum
+    a = ArticleNested.where(author_id: '123', name: 'John')
+    b = ArticleNested.where(author_id: '123', name: 'John')
+    c = ArticleNested.where(author_id: '123')
+    d = Article.where(author_id: '123', name: 'John')
+    assert(a.hash == b.hash)
+    assert_equal(false, a.hash == c.hash)
+    assert_equal(false, a.hash == d.hash)
+  end
+
+  def test_build_eql
+    a = ArticleNested.where(author_id: '123', name: 'John')
+    b = ArticleNested.where(author_id: '123', name: 'John')
+    c = ArticleNested.where(author_id: '123')
+    d = Article.where(author_id: '123', name: 'John')
+    assert(a == b)
+    assert_equal(false, a == c)
+    assert_equal(false, a == d)
+  end
 end