diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..859304a
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,13 @@
+inherit_from: .rubocop_todo.yml
+
+AllCops:
+  Exclude:
+    - 'config/initializers/devise.rb'
+    - 'db/schema*'
+
+
+Style/Documentation:
+  Enabled: false
+
+Layout/LineLength:
+  IgnoredPatterns: ['(\A|\s)#']
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
new file mode 100644
index 0000000..7be6a6d
--- /dev/null
+++ b/.rubocop_todo.yml
@@ -0,0 +1,74 @@
+# This configuration was generated by
+# `rubocop --auto-gen-config`.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 5
+Metrics/AbcSize:
+  Max: 20
+
+# Offense count: 7
+# Configuration parameters: CountComments, ExcludedMethods.
+# ExcludedMethods: refine
+Metrics/BlockLength:
+  Max: 118
+
+# Offense count: 7
+# Configuration parameters: CountComments, ExcludedMethods.
+Metrics/MethodLength:
+  Max: 18
+
+# Offense count: 2
+# Configuration parameters: NamePrefix, ForbiddenPrefixes, AllowedMethods, MethodDefinitionMacros.
+# NamePrefix: is_, has_, have_
+# ForbiddenPrefixes: is_, has_, have_
+# AllowedMethods: is_a?
+# MethodDefinitionMacros: define_method, define_singleton_method
+Naming/PredicateName:
+  Exclude:
+    - 'spec/**/*'
+    - 'app/helpers/application_helper.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: AutoCorrect, EnforcedStyle.
+# SupportedStyles: nested, compact
+Style/ClassAndModuleChildren:
+  Exclude:
+    - 'app/controllers/users/registrations_controller.rb'
+
+# Offense count: 1
+# Configuration parameters: MinBodyLength.
+Style/GuardClause:
+  Exclude:
+    - 'app/models/ability.rb'
+
+# Offense count: 1
+Style/IfUnlessModifier:
+  Exclude:
+    - 'spec/rails_helper.rb'
+
+# Offense count: 2
+Style/MixinUsage:
+  Exclude:
+    - 'bin/setup'
+    - 'bin/update'
+
+# Offense count: 29
+# Cop supports --auto-correct.
+# Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
+# URISchemes: http, https
+Layout/LineLength:
+  Exclude:
+    - 'app/controllers/houses_controller.rb'
+    - 'app/controllers/tasks_controller.rb'
+    - 'app/uploaders/avatar_uploader.rb'
+    - 'app/uploaders/house_image_uploader.rb'
+    - 'config/environments/production.rb'
+    - 'db/migrate/20190521171605_first.rb'
+    - 'spec/controllers/houses_controller_spec.rb'
+    - 'spec/models/house_spec.rb'
+    - 'spec/models/user_spec.rb'
+    - 'spec/rails_helper.rb'
diff --git a/Gemfile b/Gemfile
index cfda8d1..7d2ea97 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,6 +32,7 @@ group :development, :test do
   gem 'pry-rails'
   gem 'rails-controller-testing'
   gem 'rspec-rails', '~> 3.8'
+  gem 'rubocop', '~> 0.79.0', require: false
 end
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index c467d53..9784dcc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,6 +39,7 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     arel (8.0.0)
+    ast (2.4.0)
     autoprefixer-rails (9.5.0)
       execjs
     bcrypt (3.1.13)
@@ -111,6 +112,7 @@ GEM
     i18n (1.7.0)
       concurrent-ruby (~> 1.0)
     ipaddress (0.8.3)
+    jaro_winkler (1.5.4)
     jbuilder (2.8.0)
       activesupport (>= 4.2.0)
       multi_json (>= 1.2)
@@ -140,6 +142,9 @@ GEM
     nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
+    parallel (1.19.1)
+    parser (2.7.0.2)
+      ast (~> 2.4.0)
     pg (1.1.4)
     popper_js (1.14.5)
     pry (0.12.2)
@@ -181,6 +186,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
+    rainbow (3.0.0)
     rake (13.0.0)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
@@ -205,6 +211,14 @@ GEM
       rspec-mocks (~> 3.8.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
+    rubocop (0.79.0)
+      jaro_winkler (~> 1.5.1)
+      parallel (~> 1.10)
+      parser (>= 2.7.0.1)
+      rainbow (>= 2.2.2, < 4.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 1.7)
+    ruby-progressbar (1.10.1)
     ruby_dep (1.5.0)
     sass (3.7.3)
       sass-listen (~> 4.0.0)
@@ -234,6 +248,7 @@ GEM
       thread_safe (~> 0.1)
     uglifier (4.1.20)
       execjs (>= 0.3.0, < 3)
+    unicode-display_width (1.6.1)
     warden (1.2.8)
       rack (>= 2.0.6)
     web-console (3.7.0)
@@ -270,6 +285,7 @@ DEPENDENCIES
   rails (~> 5.1.4)
   rails-controller-testing
   rspec-rails (~> 3.8)
+  rubocop (~> 0.79.0)
   sass-rails (~> 5.0)
   sprockets-rails
   turbolinks (~> 5)
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index c7686e0..e9d90b0 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -8,14 +8,21 @@ class ApplicationController < ActionController::Base
   rescue_from CanCan::AccessDenied do |_exception|
     respond_to do |format|
       format.json { head :forbidden }
-      format.html { redirect_to houses_url, alert: "You're not authorized to perform this action." }
+      format.html do
+        redirect_to houses_url,
+                    alert: "You're not authorized to perform this action."
+      end
     end
   end
 
   protected
 
   def configure_permitted_parameters
-    devise_parameter_sanitizer.permit(:sign_up, keys: %i[nickname firstname lastname bio birthday avatar])
-    devise_parameter_sanitizer.permit(:account_update, keys: %i[nickname firstname lastname bio birthday avatar])
+    devise_parameter_sanitizer.permit(:sign_up,
+                                      keys: %i[nickname firstname lastname bio
+                                               birthday avatar])
+    devise_parameter_sanitizer.permit(:account_update,
+                                      keys: %i[nickname firstname lastname bio
+                                               birthday avatar])
   end
 end
diff --git a/app/controllers/groups_controller.rb b/app/controllers/groups_controller.rb
index 9d0efe3..3007c59 100644
--- a/app/controllers/groups_controller.rb
+++ b/app/controllers/groups_controller.rb
@@ -27,11 +27,17 @@ def create
 
     respond_to do |format|
       if @group.save
-        format.html { redirect_to house_group_url(@house, @group), notice: 'Group was successfully created.' }
+        format.html do
+          redirect_to house_group_url(@house, @group),
+                      notice: 'Group was successfully created.'
+        end
         format.json { render :show, status: :created, location: @group }
       else
         format.html { render :new }
-        format.json { render json: @group.errors, status: :unprocessable_entity }
+        format.json do
+          render json: @group.errors,
+                 status: :unprocessable_entity
+        end
       end
     end
   end
@@ -39,11 +45,17 @@ def create
   def update
     respond_to do |format|
       if @group.update(group_params)
-        format.html { redirect_to house_group_url(@house, @group), notice: 'Group was successfully updated.' }
+        format.html do
+          redirect_to house_group_url(@house, @group),
+                      notice: 'Group was successfully updated.'
+        end
         format.json { render :show, status: :ok, location: @group }
       else
         format.html { render :edit }
-        format.json { render json: @group.errors, status: :unprocessable_entity }
+        format.json do
+          render json: @group.errors,
+                 status: :unprocessable_entity
+        end
       end
     end
   end
@@ -51,7 +63,10 @@ def update
   def destroy
     @group.destroy
     respond_to do |format|
-      format.html { redirect_to house_groups_url, notice: 'Group was successfully destroyed.' }
+      format.html do
+        redirect_to house_groups_url,
+                    notice: 'Group was successfully destroyed.'
+      end
       format.json { head :no_content }
     end
   end
diff --git a/app/models/user.rb b/app/models/user.rb
index 558a8ee..8b660b2 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -27,5 +27,4 @@ def managed_houses
     end
     array
   end
-
 end