diff --git a/flake.nix b/flake.nix
index afed8b7..e1e5ac5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,6 +13,7 @@
       profile = "personal"; # select a profile defined from my profiles directory
       timezone = "America/Chicago"; # select timezone
       locale = "en_US.UTF-8"; # select locale
+      bootMode = "uefi"; # uefi or bios
     };
 
     # ----- USER SETTINGS ----- #
diff --git a/install.sh b/install.sh
index 57dddb7..97ee9b7 100755
--- a/install.sh
+++ b/install.sh
@@ -2,15 +2,35 @@
 
 # Automated script to install my dotfiles
 
+# Clone dotfiles
 nix-shell -p git --command "git clone https://gitlab.com/librephoenix/nixos-config ~/.dotfiles"
+
+# Generate hardware config for new system
 sudo nixos-generate-config --show-hardware-config > ~/.dotfiles/system/hardware-configuration.nix
+
+# Check if uefi or bios
+if [ -d /sys/firmware/efi/efivars ]; then
+    sed -i "0,/bootMode.*=.*\".*\";/s//bootMode = \"uefi\";/" ~/.dotfiles/flake.nix
+else
+    sed -i "0,/bootMode.*=.*\".*\";/s//bootMode = \"bios\";/" ~/.dotfiles/flake.nix
+fi
+
+# Patch flake.nix with different username/name and remove email by default
 sed -i "0,/emmet/s//$(whoami)/" ~/.dotfiles/flake.nix
 sed -i "0,/Emmet/s//$(getent passwd $(whoami) | cut -d ':' -f 5 | cut -d ',' -f 1)/" ~/.dotfiles/flake.nix
 sed -i "s/emmet@librephoenix.com//" ~/.dotfiles/flake.nix
+
+# Open up editor to manually edit flake.nix before install
 if [ -z "$EDITOR" ]; then
     EDITOR=nano;
 fi
 $EDITOR ~/.dotfiles/flake.nix;
+
+# Rebuild system
 sudo nixos-rebuild switch --flake ~/.dotfiles#system;
+
+# Install and build home-manager configuration
 nix run home-manager/master --extra-experimental-features nix-command --extra-experimental-features flakes -- switch --flake ~/.dotfiles#user;
+
+# Permissions for files that should be owned by root
 sudo ~/.dotfiles/harden.sh ~/.dotfiles;
diff --git a/profiles/work/configuration.nix b/profiles/work/configuration.nix
index 8b7e8c0..acf58c4 100644
--- a/profiles/work/configuration.nix
+++ b/profiles/work/configuration.nix
@@ -46,9 +46,10 @@
   boot.kernelModules = [ "i2c-dev" "i2c-piix4" "cpufreq_powersave" ];
 
   # Bootloader
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
-  boot.loader.efi.efiSysMountPoint = "/boot";
+  # Use systemd-boot if uefi, default to grub otherwise
+  boot.loader.systemd-boot.enable = if (systemSettings.bootMode == "uefi") then true else false;
+  boot.loader.efi.canTouchEfiVariables = if (systemSettings.bootMode == "uefi") then true else false;
+  boot.loader.efi.efiSysMountPoint = "/boot"; # does nothing if running bios rather than uefi
 
   # Networking
   networking.hostName = systemSettings.hostname; # Define your hostname.