diff --git a/installers/common.sh b/installers/common.sh
new file mode 100644
index 00000000..99f6a935
--- /dev/null
+++ b/installers/common.sh
@@ -0,0 +1,127 @@
+raspap_dir="/etc/raspap"
+raspap_user="www-data"
+webroot_dir="/var/www"
+
+# Outputs a RaspAP INSTALL log line
+function install_log() {
+    echo -e "\033[1;32mRaspAP INSTALL: $*\033[m"
+}
+
+# Outputs a RaspAP INSTALL ERROR log line and exits with status code 1
+function install_error() {
+    echo -e "\033[1;37;41mRaspAP INSTALL ERROR: $*\033[m"
+    exit 1
+}
+
+### NOTE: all the below functions are overloadable for system-specific installs
+### NOTE: some of the below functions MUST be overloaded due to system-specific installs
+
+function config_installation() {
+    install_log "Configure installation"
+    echo -n "Install directory [${raspap_dir}]: "
+    read input
+    if [ ! -z "$input" ]; then
+        raspap_dir="$input"
+    fi
+
+    echo -n "Complete installation with these values? [y/N]: "
+    read answer
+    if [[ $answer != "y" ]]; then
+        echo "Installation aborted."
+        exit 0
+    fi
+}
+
+# Runs a system software update to make sure we're using all fresh packages
+function update_system_packages() {
+    # OVERLOAD THIS
+    install_error "No function definition for update_system_packages"
+}
+
+# Installs additional dependencies using system package manager
+function install_dependencies() {
+    # OVERLOAD THIS
+    install_error "No function definition for install_dependencies"
+}
+
+# Enables PHP for lighttpd and restarts service for settings to take effect
+function enable_php_lighttpd() {
+    install_log "Enabling PHP for lighttpd"
+
+    sudo lighty-enable-mod fastcgi-php || install_error "Unable to enable fastcgi-php for lighttpd"
+    sudo /etc/init.d/lighttpd restart || install_error "Unable to restart lighttpd"
+}
+
+# Verifies existence and permissions of RaspAP directory
+function create_raspap_directories() {
+    install_log "Creating RaspAP directories"
+    if [ ! -d "$raspap_dir" ]; then
+        sudo mkdir -p "$raspap_dir" || install_error "Unable to create directory '$raspap_dir'"
+    fi
+
+    sudo chown -R $raspap_user:$raspap_user "$raspap_dir" || install_error "Unable to change file ownership for '$raspap_dir'"
+}
+
+# Fetches latest files from github to webroot
+function download_latest_files() {
+    if [ ! -d "$webroot_dir" ]; then
+        install_error "Web root directory doesn't exist"
+    fi
+
+    install_log "Cloning latest files from github"
+    sudo git clone https://github.com/billz/raspap-webgui "$webroot_dir" || install_error "Unable to download files from github"
+}
+
+# Sets files ownership in web root directory
+function change_file_ownership() {
+    if [ ! -d "$webroot_dir" ]; then
+        install_error "Web root directory doesn't exist"
+    fi
+
+    install_log "Changing file ownership in web root directory"
+    sudo chown -R $raspap_user:$raspap_user "$webroot_dir" || install_error "Unable to change file ownership for '$webroot_dir'"
+}
+
+# Move configuration file to the correct location
+function move_config_file() {
+    if [ ! -d "$raspap_dir" ]; then
+        install_error "'$raspap_dir' directory doesn't exist"
+    fi
+
+    install_log "Moving configuration file to '$raspap_dir'"
+    sudo mv "$webroot_dir"/raspap.php "$raspap_dir" || install_error "Unable to move files to '$raspap_dir'"
+    sudo chown -R $raspap_user:$raspap_user "$raspap_dir" || install_error "Unable to change file ownership for '$raspap_dir'"
+}
+
+# Adds www-data user to the sudoers file with restrictions on what the user can execute
+function patch_system_files() {
+    install_log "Patching system sudoers file"
+    # patch /etc/sudoers file
+    sudo bash -c 'echo "www-data ALL=(ALL) NOPASSWD:/sbin/ifdown wlan0,/sbin/ifup wlan0,/bin/cat /etc/wpa_supplicant/wpa_supplicant.conf,/bin/cp /tmp/wifidata /etc/wpa_supplicant/wpa_supplicant.conf,/sbin/wpa_cli scan_results, /sbin/wpa_cli scan,/bin/cp /tmp/hostapddata /etc/hostapd/hostapd.conf, /etc/init.d/hostapd start,/etc/init.d/hostapd stop,/etc/init.d/dnsmasq start, /etc/init.d/dnsmasq stop,/bin/cp /tmp/dhcpddata /etc/dnsmasq.conf, /sbin/shutdown -h now, /sbin/reboot" | (EDITOR="tee -a" visudo)' \
+        || install_error "Unable to patch /etc/sudoers"
+}
+
+function install_complete() {
+    install_log "Installation completed!"
+    
+    echo -n "The system needs to be rebooted as a final step. Reboot now? [y/N]: "
+    read answer
+    if [[ $answer != "y" ]]; then
+        echo "Installation aborted."
+        exit 0
+    fi
+    sudo shutdown -h now || install_error "Unable to execute shutdown"
+}
+
+function install_raspap() {
+    config_installation
+    update_system_packages
+    install_dependencies
+    enable_php_lighttpd
+    create_raspap_directories
+    download_latest_files
+    change_file_ownership
+    move_config_file
+    patch_system_files
+    install_complete
+}
\ No newline at end of file