diff --git a/app/helpers/bulk_upload/lettings_log_to_csv.rb b/app/helpers/bulk_upload/lettings_log_to_csv.rb
index 891331e40..5ddd8d6a9 100644
--- a/app/helpers/bulk_upload/lettings_log_to_csv.rb
+++ b/app/helpers/bulk_upload/lettings_log_to_csv.rb
@@ -93,12 +93,162 @@ class BulkUpload::LettingsLogToCsv
 
   def default_2026_field_numbers
     # TODO: CLDC-4162 Replace with actual field numbers when 2026 format is known
-    (1..129).to_a
+    (1..132).to_a
   end
 
   def to_2026_row
     # TODO: CLDC-4162: Implement when 2026 format is known
-    to_2025_row
+    owning_organisation = if overrides[:organisation_id]
+                          then Organisation.find(overrides[:organisation_id])
+                          else
+                            log.owning_organisation
+                          end
+    [
+      owning_organisation&.id, # 1
+      overrides[:managing_organisation_id] || log.managing_organisation&.old_visible_id,
+      log.assigned_to&.email,
+      log.needstype,
+      log.scheme&.id ? "S#{log.scheme&.id}" : "",
+      log.location&.id,
+      renewal,
+      log.startdate&.day,
+      log.startdate&.month,
+      log.startdate&.strftime("%y"), # 10
+
+      rent_type,
+      log.irproduct_other,
+      log.tenancycode,
+      log.propcode,
+      log.declaration,
+      log.rsnvac,
+      log.unitletas,
+      log.uprn,
+      log.address_line1&.tr(",", " "),
+      log.address_line2&.tr(",", " "), # 20
+
+      log.town_or_city&.tr(",", " "),
+      log.county&.tr(",", " "),
+      ((log.postcode_full || "").split(" ") || [""]).first,
+      ((log.postcode_full || "").split(" ") || [""]).last,
+      log.la,
+      log.unittype_gn,
+      log.builtype,
+      log.wchair,
+      log.beds,
+      log.voiddate&.day, # 30
+
+      log.voiddate&.month,
+      log.voiddate&.strftime("%y"),
+      log.mrcdate&.day,
+      log.mrcdate&.month,
+      log.mrcdate&.strftime("%y"),
+      log.sheltered,
+      log.joint,
+      log.startertenancy,
+      log.tenancy,
+      log.tenancyother, # 40
+
+      log.tenancylength,
+      log.age1 || overrides[:age1],
+      log.sex1,
+      log.ethnic,
+      log.nationality_all_group,
+      log.ecstat1,
+      relat_number(log.relat2),
+      log.age2 || overrides[:age2],
+      log.sex2,
+      log.ecstat2, # 50
+
+      relat_number(log.relat3),
+      log.age3 || overrides[:age3],
+      log.sex3,
+      log.ecstat3,
+      relat_number(log.relat4),
+      log.age4 || overrides[:age4],
+      log.sex4,
+      log.ecstat4,
+      relat_number(log.relat5),
+      log.age5 || overrides[:age5], # 60
+
+      log.sex5,
+      log.ecstat5,
+      relat_number(log.relat6),
+      log.age6 || overrides[:age6],
+      log.sex6,
+      log.ecstat6,
+      relat_number(log.relat7),
+      log.age7 || overrides[:age7],
+      log.sex7,
+      log.ecstat7, # 70
+
+      relat_number(log.relat8),
+      log.age8 || overrides[:age8],
+      log.sex8,
+      log.ecstat8,
+      log.armedforces,
+      log.leftreg,
+      log.reservist,
+      log.preg_occ,
+      log.housingneeds_a,
+      log.housingneeds_b, # 80
+
+      log.housingneeds_c,
+      log.housingneeds_f,
+      log.housingneeds_g,
+      log.housingneeds_h,
+      overrides[:illness] || log.illness,
+      log.illness_type_1,
+      log.illness_type_2,
+      log.illness_type_3,
+      log.illness_type_4,
+      log.illness_type_5, # 90
+
+      log.illness_type_6,
+      log.illness_type_7,
+      log.illness_type_8,
+      log.illness_type_9,
+      log.illness_type_10,
+      log.layear,
+      log.waityear,
+      log.reason,
+      log.reasonother,
+      log.prevten, # 100
+
+      homeless,
+      previous_postcode_known,
+      ((log.ppostcode_full || "").split(" ") || [""]).first,
+      ((log.ppostcode_full || "").split(" ") || [""]).last,
+      log.prevloc,
+      log.reasonpref,
+      log.rp_homeless,
+      log.rp_insan_unsat,
+      log.rp_medwel,
+      log.rp_hardship, # 110
+
+      log.rp_dontknow,
+      cbl,
+      chr,
+      cap,
+      accessible_register,
+      owning_organisation&.la? ? log.referral_register : nil,
+      net_income_known,
+      log.incfreq,
+      log.earnings,
+      log.hb, # 120
+
+      log.benefits,
+      log.household_charge,
+      log.period,
+      log.brent,
+      log.scharge,
+      log.pscharge,
+      log.supcharg,
+      log.hbrentshortfall,
+      log.tshortfall,
+      owning_organisation&.prp? ? log.referral_register : nil,
+      log.referral_noms,
+      log.referral_org, # 132
+    ]
   end
 
   def to_2025_row
diff --git a/app/models/organisation.rb b/app/models/organisation.rb
index 94390c3f9..b33d896c4 100644
--- a/app/models/organisation.rb
+++ b/app/models/organisation.rb
@@ -74,6 +74,7 @@ class Organisation < ApplicationRecord
   before_save :clear_group_member_fields_if_not_group_member
 
   alias_method :la?, :LA?
+  alias_method :prp?, :PRP?
 
   validates :name, presence: { message: I18n.t("validations.organisation.name_missing") }
   validates :name, uniqueness: { case_sensitive: false, message: I18n.t("validations.organisation.name_not_unique") }
diff --git a/app/services/bulk_upload/lettings/year2026/csv_parser.rb b/app/services/bulk_upload/lettings/year2026/csv_parser.rb
index 2484cbc4b..d74b191e5 100644
--- a/app/services/bulk_upload/lettings/year2026/csv_parser.rb
+++ b/app/services/bulk_upload/lettings/year2026/csv_parser.rb
@@ -4,8 +4,8 @@ class BulkUpload::Lettings::Year2026::CsvParser
   include CollectionTimeHelper
 
   # TODO: CLDC-4162: Update when 2026 format is known
-  FIELDS = 129
-  MAX_COLUMNS = 130
+  FIELDS = 132
+  MAX_COLUMNS = 133
   FORM_YEAR = 2026
 
   attr_reader :path
@@ -28,7 +28,7 @@ class BulkUpload::Lettings::Year2026::CsvParser
 
   def cols
     # TODO: CLDC-4162: Update when 2026 format is known
-    @cols ||= ("A".."DZ").to_a
+    @cols ||= ("A".."EC").to_a
   end
 
   def row_parsers
diff --git a/app/services/bulk_upload/lettings/year2026/row_parser.rb b/app/services/bulk_upload/lettings/year2026/row_parser.rb
index 84f6f57d9..6d07cca64 100644
--- a/app/services/bulk_upload/lettings/year2026/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2026/row_parser.rb
@@ -120,7 +120,7 @@ class BulkUpload::Lettings::Year2026::RowParser
     field_113: "Was the letting made under the Common Allocation Policy (CAP)?",
     field_114: "Was the letting made under the Common Housing Register (CHR)?",
     field_115: "Was the letting made under the Accessible Register?",
-    field_116: "What was the source of referral for this letting?",
+    field_116: "What was the source of referral for this letting? - LA properties",
     field_117: "Do you know the household’s combined total income after tax?",
     field_118: "How often does the household receive income?",
     field_119: "How much income does the household have in total?",
@@ -134,6 +134,9 @@ class BulkUpload::Lettings::Year2026::RowParser
     field_127: "What is the support charge?",
     field_128: "After the household has received any housing-related benefits, will they still need to pay for rent and charges?",
     field_129: "What do you expect the outstanding amount to be?",
+    field_130: "What was the source of referral for this letting? - PRP properties part 1",
+    field_131: "What was the source of referral for this letting? - PRP properties part 2",
+    field_132: "What was the source of referral for this letting? - PRP properties part 3",
   }.freeze
 
   RENT_TYPE_BU_MAPPING = {
@@ -282,6 +285,9 @@ class BulkUpload::Lettings::Year2026::RowParser
   attribute :field_127, :decimal
   attribute :field_128, :integer
   attribute :field_129, :decimal
+  attribute :field_130, :integer
+  attribute :field_131, :integer
+  attribute :field_132, :integer
 
   validate :validate_valid_radio_option, on: :before_log
 
@@ -1101,8 +1107,9 @@ private
       accessible_register: %i[field_115],
       letting_allocation: %i[field_112 field_113 field_114 field_115],
 
-      referral_type: %i[field_116],
-      referral: %i[field_116],
+      referral_register: %i[field_116 field_130],
+      referral_noms: %i[field_131],
+      referral_org: %i[field_132],
 
       net_income_known: %i[field_117],
       incfreq: %i[field_118],
@@ -1287,8 +1294,9 @@ private
     attributes["accessible_register"] = accessible_register
     attributes["letting_allocation_unknown"] = letting_allocation_unknown
 
-    attributes["referral_type"] = referral_type
-    attributes["referral"] = field_116
+    attributes["referral_register"] = referral_register
+    attributes["referral_noms"] = referral_noms
+    attributes["referral_org"] = referral_org
 
     attributes["net_income_known"] = net_income_known
     attributes["earnings"] = earnings
@@ -1684,21 +1692,29 @@ private
     false
   end
 
-  def referral_type
-    mapping = {
-      1 => [20, 2, 8],
-      2 => [21, 3, 4, 22],
-      3 => [1, 10, 23],
-      4 => [15, 9, 14, 24, 17],
-      5 => [18, 19],
-      6 => [7],
-      7 => [16],
-    }
+  def referral_register
+    return unless owning_organisation
 
-    mapping.each do |key, values|
-      return key if values.include?(field_116)
+    if owning_organisation.la?
+      field_116
+    else
+      field_130
     end
+  end
 
-    0
+  def referral_noms
+    return unless owning_organisation
+
+    if owning_organisation.la?
+      field_131
+    end
+  end
+
+  def referral_org
+    return unless owning_organisation
+
+    if owning_organisation.la?
+      field_132
+    end
   end
 end