diff --git a/app/services/bulk_upload/lettings/validator.rb b/app/services/bulk_upload/lettings/validator.rb
index b6df4b1bc..b76e95fec 100644
--- a/app/services/bulk_upload/lettings/validator.rb
+++ b/app/services/bulk_upload/lettings/validator.rb
@@ -130,9 +130,9 @@ private
   def validate_max_columns
     return if halt_validations?
 
-    max_row_size = rows.map(&:size).max
+    column_count = rows.map(&:size).max
 
-    errors.add(:file, :max_row_size) if max_row_size > 136
+    errors.add(:file, :column_count) if column_count > csv_parser.class::MAX_COLUMNS
   end
 
   def halt_validations!
diff --git a/app/services/bulk_upload/lettings/year2022/csv_parser.rb b/app/services/bulk_upload/lettings/year2022/csv_parser.rb
index ddbd8e31b..0e337abf0 100644
--- a/app/services/bulk_upload/lettings/year2022/csv_parser.rb
+++ b/app/services/bulk_upload/lettings/year2022/csv_parser.rb
@@ -1,6 +1,8 @@
 require "csv"
 
 class BulkUpload::Lettings::Year2022::CsvParser
+  MAX_COLUMNS = 136
+
   attr_reader :path
 
   def initialize(path:)
diff --git a/app/services/bulk_upload/lettings/year2023/csv_parser.rb b/app/services/bulk_upload/lettings/year2023/csv_parser.rb
index ea686566d..17d14f86c 100644
--- a/app/services/bulk_upload/lettings/year2023/csv_parser.rb
+++ b/app/services/bulk_upload/lettings/year2023/csv_parser.rb
@@ -1,6 +1,8 @@
 require "csv"
 
 class BulkUpload::Lettings::Year2023::CsvParser
+  MAX_COLUMNS = 143
+
   attr_reader :path
 
   def initialize(path:)