diff --git a/app/models/custom_attributes/custom_attribute_definition.rb b/app/models/custom_attributes/custom_attribute_definition.rb
index 324ae3a..b5de77d 100644
--- a/app/models/custom_attributes/custom_attribute_definition.rb
+++ b/app/models/custom_attributes/custom_attribute_definition.rb
@@ -5,11 +5,16 @@ module CustomAttributeDefinition
       scope :by_sort_order, -> { order('sort_order ASC') }
       validates :attr_name, presence: true, format: { with: /^[a-zA-Z\_\s]+$/, multiline: true, message: 'cannot contain special characters.' }
       validates :default_value, format: { with: /^[\+\-]?\d*\.?\d*$/, multiline: true, message: 'should be a number.' }, if: :number_type?
+      validate  :can_be_marked_as_unique
 
       def number_type?
         [CustomAttributes::CustomAttribute::TYPE_NUMBER, CustomAttributes::CustomAttribute::TYPE_DECIMAL].include?(attr_type)
       end
 
+      def text_type?
+        attr_type == CustomAttributes::CustomAttribute::TYPE_TEXT
+      end
+      
       def boolean_type?
         attr_type == CustomAttributes::CustomAttribute::TYPE_BOOLEAN
       end
@@ -30,6 +35,7 @@ def save_custom_attribute(selected_option_label)
         begin
           transaction do
             self.custom_attribute_options = [] unless has_options?
+            default_value = "" if unique?
             save!
             if has_options?
               update! default_value: custom_attribute_options.find_by(label: selected_option_label).try(:id)
@@ -44,6 +50,7 @@ def save_custom_attribute(selected_option_label)
       def update_custom_attribute(custom_attribute_params, selected_option_label)
         begin
           transaction do
+            custom_attribute_params[:default_value] = "" if unique?
             update!(custom_attribute_params)
             if has_options?
               update! default_value: custom_attribute_options.find_by(label: selected_option_label).try(:id)
@@ -58,6 +65,32 @@ def update_custom_attribute(custom_attribute_params, selected_option_label)
       def default_option
         custom_attribute_options.find_by(id: default_value)
       end
+
+      def can_be_marked_as_unique
+        if unique? 
+          if !can_be_unique?
+            errors.add :base, 'Can not be made as unique!'
+          elsif has_duplicate_values?
+            errors.add :base, 'Remove duplicate values first to make is unique.'
+          end
+        end
+        errors.blank?
+      end
+
+      def can_be_unique?
+        text_type? || number_type?
+      end
+
+      def has_duplicate_values?
+        column = {
+          CustomAttributes::CustomAttribute::TYPE_TEXT    => 'string_value', 
+          CustomAttributes::CustomAttribute::TYPE_NUMBER  => 'integer_value', 
+          CustomAttributes::CustomAttribute::TYPE_DECIMAL => 'double_value', 
+        }[attr_type]
+        return false if column.blank?
+        duplicate_cavs = custom_attribute_values.where("#{column} IS NOT NULL").select("#{column}, count(*) as values_count").group(column).having("count(*) > 1")
+        duplicate_cavs.present?
+      end
     end
   end
 end
\ No newline at end of file
diff --git a/app/models/custom_attributes/custom_attributes_utilities.rb b/app/models/custom_attributes/custom_attributes_utilities.rb
new file mode 100644
index 0000000..7f7d19c
--- /dev/null
+++ b/app/models/custom_attributes/custom_attributes_utilities.rb
@@ -0,0 +1,24 @@
+module CustomAttributes
+  module CustomAttributesUtilities
+    extend ActiveSupport::Concern
+
+    included do
+      after_save :check_duplicate_custom_attributes 
+    end
+
+    def check_duplicate_custom_attributes
+      return unless self.custom_attribute_defn.unique?
+      column_maping = {
+        "#{self.owner.class.name}CustomAttributeStringValue"  => 'string_value', 
+        "#{self.owner.class.name}CustomAttributeIntegerValue" => 'integer_value', 
+        "#{self.owner.class.name}CustomAttributeDoubleValue"  => 'double_value', 
+      }
+
+      return if column_maping[self.class.name].blank?
+      if self.value.present?
+        duplicate_count = self.class.where("#{column_maping[self.class.name]} = ?", self.value).count
+        raise StandardError.new("Duplicate value for '#{self.custom_attribute_defn.attr_name}'") if duplicate_count > 1
+      end
+    end
+  end
+end
\ No newline at end of file
diff --git a/app/views/custom_attributes/custom_attribute_definitions/_form_fields_only.html.erb b/app/views/custom_attributes/custom_attribute_definitions/_form_fields_only.html.erb
index f6462e6..05f38b0 100644
--- a/app/views/custom_attributes/custom_attribute_definitions/_form_fields_only.html.erb
+++ b/app/views/custom_attributes/custom_attribute_definitions/_form_fields_only.html.erb
@@ -57,4 +57,17 @@
 
 <% if new_record %>
   <%= f.hidden_field :sort_order %>
-<% end %>
\ No newline at end of file
+<% end %>
+
+<div class="clearfix"></div>
+<h3>Preferences</h3>
+<div class="clearfix"></div>
+
+<div class='custom_attribute_required margin-bottom-55'>
+  <%= f.check_box :required, class: "ca_required ca_required_field", disabled: f.object.try(:boolean_type?) %> Make this mandatory <br/>
+</div>
+
+<div class='custom_attribute_unique margin-bottom-55'>
+  <% unique_restricted = !f.object.try(:can_be_unique?) || f.object.try(:has_duplicate_values?) %>
+  <%= f.check_box :unique, class: "ca_unique ca_unique_field", id: 'make_unique_checkbox', disabled: unique_restricted %> Make this unique <br/>
+</div>
diff --git a/lib/custom_attributes/version.rb b/lib/custom_attributes/version.rb
index 5d205c0..c25737b 100644
--- a/lib/custom_attributes/version.rb
+++ b/lib/custom_attributes/version.rb
@@ -1,3 +1,3 @@
 module CustomAttributes
-  VERSION = "0.1.18"
+  VERSION = "0.1.19"
 end
\ No newline at end of file
diff --git a/lib/generators/custom_attributes/templates/custom_attribute_definition_model.rb b/lib/generators/custom_attributes/templates/custom_attribute_definition_model.rb
index b003314..5b612eb 100644
--- a/lib/generators/custom_attributes/templates/custom_attribute_definition_model.rb
+++ b/lib/generators/custom_attributes/templates/custom_attribute_definition_model.rb
@@ -1,5 +1,6 @@
 class <%= name %>CustomAttributeDefinition < ActiveRecord::Base
   include CustomAttributes::CustomAttributeDefinition
+  has_many :custom_attribute_values, dependent: :destroy, class_name: "<%= name %>CustomAttributeValue", foreign_key: "<%= singular_name %>_custom_attribute_definition_id"
   has_many :custom_attribute_options, dependent: :destroy, class_name: "<%= name %>CustomAttributeOption", foreign_key: "<%= singular_name %>_custom_attribute_definition_id"
   <% if options.tenant %>
     validates :attr_name, uniqueness: { scope: :<%= options.tenant %>_id, message: " has already been taken." }
diff --git a/lib/generators/custom_attributes/templates/custom_attribute_definitions_controller.rb b/lib/generators/custom_attributes/templates/custom_attribute_definitions_controller.rb
index 94e97c9..f530f3d 100644
--- a/lib/generators/custom_attributes/templates/custom_attribute_definitions_controller.rb
+++ b/lib/generators/custom_attributes/templates/custom_attribute_definitions_controller.rb
@@ -34,6 +34,8 @@ def custom_attribute_params
       :attr_name, 
       :attr_type, 
       :sort_order,
+      :required, 
+      :unique,
       custom_attribute_options_attributes: [
         :id,
         :label,
diff --git a/lib/generators/custom_attributes/templates/custom_attribute_value_model.rb b/lib/generators/custom_attributes/templates/custom_attribute_value_model.rb
index e3ac1bc..5c5b7ef 100644
--- a/lib/generators/custom_attributes/templates/custom_attribute_value_model.rb
+++ b/lib/generators/custom_attributes/templates/custom_attribute_value_model.rb
@@ -1,5 +1,5 @@
 class <%= name %>CustomAttributeValue < ActiveRecord::Base
-  include CustomAttributes::CustomAttributeValue
+  include CustomAttributes::CustomAttributeValue, CustomAttributes::CustomAttributesUtilities
   belongs_to :custom_attribute_defn, class_name: "<%= name %>CustomAttributeDefinition", foreign_key: "<%= singular_name %>_custom_attribute_definition_id"
   belongs_to :owner, class_name: "<%= name %>", foreign_key: "<%= singular_name %>_id"
   has_many   :custom_attribute_options, through: :custom_attribute_defn
diff --git a/lib/generators/custom_attributes/templates/migration.rb b/lib/generators/custom_attributes/templates/migration.rb
index 5b34e96..13b7e8c 100644
--- a/lib/generators/custom_attributes/templates/migration.rb
+++ b/lib/generators/custom_attributes/templates/migration.rb
@@ -8,6 +8,7 @@ def change
       t.string :placeholder
       t.integer :sort_order
       t.boolean :required, default: false
+      t.boolean :unique,   default: false
     end
   <% if options.tenant %>
       t.integer :<%= options.tenant.underscore %>_id, foreign_key: true