diff --git a/app/models/location.rb b/app/models/location.rb
index 58afc76e8..c333f653f 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, on: :units, numericality: { greater_than_or_equal_to: 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 80711129e..851a9ea2c 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -361,7 +361,9 @@ 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."
diff --git a/spec/models/location_spec.rb b/spec/models/location_spec.rb
index 18581fb6e..c220914b7 100644
--- a/spec/models/location_spec.rb
+++ b/spec/models/location_spec.rb
@@ -740,10 +740,38 @@ RSpec.describe Location, type: :model do
   describe "#units" do
     let(:location) { FactoryBot.build(:location) }
 
-    it "does add an error when the number of units is invalid" do
-      location.units = nil
-      location.valid?(:units)
-      expect(location.errors.count).to eq(1)
+    context "when the number of units is invalid" do
+      it "adds an error when units is nil" do
+        location.units = nil
+        location.valid?(:units)
+        expect(location.errors.count).to eq(2)
+      end
+
+      it "adds an error when units is 0" do
+        location.units = 0
+        location.valid?(:units)
+        expect(location.errors.count).to eq(1)
+      end
+    end
+
+    context "when the number of units is valid" do
+      it "does not add an error when units is 1" do
+        location.units = 1
+        location.valid?(:units)
+        expect(location.errors.count).to eq(0)
+      end
+
+      it "does not add an error when units is 10" do
+        location.units = 10
+        location.valid?(:units)
+        expect(location.errors.count).to eq(0)
+      end
+
+      it "does not add an error when units is 200" do
+        location.units = 200
+        location.valid?(:units)
+        expect(location.errors.count).to eq(0)
+      end
     end
   end
 
diff --git a/spec/models/validations/setup_validations_spec.rb b/spec/models/validations/setup_validations_spec.rb
index 5b4f03365..1104cc23d 100644
--- a/spec/models/validations/setup_validations_spec.rb
+++ b/spec/models/validations/setup_validations_spec.rb
@@ -703,7 +703,7 @@ RSpec.describe Validations::SetupValidations do
           .to include("This location is incomplete. Select another location or update this one.")
       end
 
-      it "produces no error when location is completes" do
+      it "produces no error when location is complete" do
         location.update!(units: 1)
         location.reload
         record.location = location