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diff --git a/app/models/backends/terraform_aws_using_ami/mini_environment_methods.rb b/app/models/backends/terraform_aws_using_ami/mini_environment_methods.rb
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+++ b/app/models/backends/terraform_aws_using_ami/mini_environment_methods.rb
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+# GOV.UK Mini Environment Admin
+# Copyright © 2018, 2019  Christopher Baines <mail@cbaines.net>
+#
+# This file is part of the GOV.UK Mini Environment Admin.
+#
+# The GOV.UK Mini Environment Admin is free software: you can
+# redistribute it and/or modify it under the terms of the GNU Affero
+# General Public License as published by the Free Software Foundation,
+# either version 3 of the License, or (at your option) any later
+# version.
+#
+# The GOV.UK Mini Environment Admin is distributed in the hope that it
+# will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public
+# License along with the GOV.UK Mini Environment Admin.  If not, see
+# <http://www.gnu.org/licenses/>.
+
+module Backends::TerraformAwsUsingAmi::MiniEnvironmentMethods
+  def build(mini_environment)
+    slug = mini_environment.name.parameterize
+
+    GovukGuix::BuildMiniEnvironment.build(
+      mini_environment.id,
+      services: mini_environment.services.map(&:build_argument_string),
+      arguments: {
+        type: 'aws-packer-ami',
+        app_domain: "#{slug}.#{domain}",
+        web_domain: "www.#{slug}.#{domain}",
+        use_https: 'certbot',
+        signon_instance_name: slug,
+        admin_environment_label: mini_environment.name,
+        use_error_pages: 'true',
+        origin_basic_auth: "#{slug}=#{slug}",
+      },
+      run_remotely_on_host: mini_environment.backend.build_remote_host
+    )
+  end
+
+  def start(mini_environment)
+    logger.info "Setting up #{mini_environment.name}"
+
+    within_terraform_working_directory(mini_environment) do
+      RubyTerraform.apply(
+        vars: terraform_variables(mini_environment),
+        auto_approve: true
+      )
+    end
+  end
+
+  def destroy(mini_environment)
+    within_terraform_working_directory(mini_environment) do
+      RubyTerraform.destroy(
+        vars: terraform_variables(mini_environment),
+        force: true
+      )
+    end
+  end
+
+  def refresh(mini_environment)
+    within_terraform_working_directory(mini_environment) do
+      RubyTerraform.refresh(
+        vars: terraform_variables(mini_environment)
+      )
+    end
+  end
+
+  def terraform_states(mini_environment)
+    TerraformState.where(
+      state_id: mini_environment_state_id(mini_environment)
+    )
+  end
+
+  def within_terraform_working_directory(mini_environment, &block)
+    with_advisory_lock(
+      "terraform"
+    ) do
+      TerraformWorkingDirectory.new(
+        mini_environment_state_id(mini_environment),
+        'terraform/aws/mini_environment'
+      ).within_working_directory(&block)
+    end
+  end
+
+  def mini_environment_state_id(mini_environment)
+    "mini_environment/#{mini_environment.id}"
+  end
+
+  def signon_url(mini_environment)
+    "https://signon.#{mini_environment.name.parameterize}.#{domain}"
+  end
+
+  def terraform_variables(mini_environment)
+    credentials = TerraformHttpBackendController.credentials
+
+    common_terraform_variables.merge(
+      slug: mini_environment.name.parameterize,
+      ami_id: mini_environment.backend_data['build_output'],
+      backend_remote_state_address: (
+        Plek.new.external_url_for('mini-environment-admin') +
+        Rails
+          .application
+          .routes
+          .url_helpers
+          .terraform_http_backend_path(terraform_state_id)
+      ),
+      backend_remote_state_username: credentials[:name],
+      backend_remote_state_password: credentials[:password]
+    )
+  end
+end