diff --git a/app/models/location.rb b/app/models/location.rb
index 03af24a94..1f0f89fbc 100644
--- a/app/models/location.rb
+++ b/app/models/location.rb
@@ -2,7 +2,8 @@ class Location < ApplicationRecord
   validates :postcode, on: :postcode, presence: { message: I18n.t("validations.location.postcode_blank") }
   validate :validate_postcode, on: :postcode, if: proc { |model| model.postcode.presence }
   validates :location_admin_district, on: :location_admin_district, presence: { message: I18n.t("validations.location_admin_district") }
-  validates :units, on: :units, presence: { message: I18n.t("validations.location.units") }
+  validates :units, on: :units, presence: { message: I18n.t("validations.location.units.must_be_number") }
+  validates :units, numericality: { greater_than: 1, message: I18n.t("validations.location.units.must_be_one_or_more") }
   validates :type_of_unit, on: :type_of_unit, presence: { message: I18n.t("validations.location.type_of_unit") }
   validates :mobility_type, on: :mobility_type, presence: { message: I18n.t("validations.location.mobility_standards") }
   validates :startdate, on: :startdate, presence: { message: I18n.t("validations.location.startdate_invalid") }
diff --git a/config/locales/en.yml b/config/locales/en.yml
index f8bb8255b..0950210f3 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -354,7 +354,9 @@ en:
 
     location:
       postcode_blank: "Enter a postcode."
-      units: "The units at this location must be a number."
+      units:
+        must_be_number: "The units at this location must be a number."
+        must_be_one_or_more: "Number of units must be at least 1."
       type_of_unit: "Select the most common type of unit at this location."
       mobility_standards: "Select the mobility standard for the majority of the units at this location."
       startdate_invalid: "Enter a valid day, month and year when the first property became available at this location."