diff --git a/misc/build.func b/misc/build.func
index bcc237a7d..9aa69ef56 100644
--- a/misc/build.func
+++ b/misc/build.func
@@ -231,6 +231,100 @@ install_ssh_keys_into_ct() {
   return 0
 }
 
+# ------------------------------------------------------------------------------
+# validate_container_id()
+#
+# - Validates if a container ID is available for use
+# - Checks if ID is already used by VM or LXC container
+# - Checks if ID is used in LVM logical volumes
+# - Returns 0 if ID is available, 1 if already in use
+# ------------------------------------------------------------------------------
+validate_container_id() {
+  local ctid="$1"
+
+  # Check if ID is numeric
+  if ! [[ "$ctid" =~ ^[0-9]+$ ]]; then
+    return 1
+  fi
+
+  # Check if config file exists for VM or LXC
+  if [[ -f "/etc/pve/qemu-server/${ctid}.conf" ]] || [[ -f "/etc/pve/lxc/${ctid}.conf" ]]; then
+    return 1
+  fi
+
+  # Check if ID is used in LVM logical volumes
+  if lvs --noheadings -o lv_name 2>/dev/null | grep -qE "(^|[-_])${ctid}($|[-_])"; then
+    return 1
+  fi
+
+  return 0
+}
+
+# ------------------------------------------------------------------------------
+# get_valid_container_id()
+#
+# - Returns a valid, unused container ID
+# - If provided ID is valid, returns it
+# - Otherwise increments from suggested ID until a free one is found
+# - Calls validate_container_id() to check availability
+# ------------------------------------------------------------------------------
+get_valid_container_id() {
+  local suggested_id="${1:-$(pvesh get /cluster/nextid)}"
+
+  while ! validate_container_id "$suggested_id"; do
+    suggested_id=$((suggested_id + 1))
+  done
+
+  echo "$suggested_id"
+}
+
+# ------------------------------------------------------------------------------
+# validate_container_id()
+#
+# - Validates if a container ID is available for use
+# - Checks if ID is already used by VM or LXC container
+# - Checks if ID is used in LVM logical volumes
+# - Returns 0 if ID is available, 1 if already in use
+# ------------------------------------------------------------------------------
+validate_container_id() {
+  local ctid="$1"
+
+  # Check if ID is numeric
+  if ! [[ "$ctid" =~ ^[0-9]+$ ]]; then
+    return 1
+  fi
+
+  # Check if config file exists for VM or LXC
+  if [[ -f "/etc/pve/qemu-server/${ctid}.conf" ]] || [[ -f "/etc/pve/lxc/${ctid}.conf" ]]; then
+    return 1
+  fi
+
+  # Check if ID is used in LVM logical volumes
+  if lvs --noheadings -o lv_name 2>/dev/null | grep -qE "(^|[-_])${ctid}($|[-_])"; then
+    return 1
+  fi
+
+  return 0
+}
+
+# ------------------------------------------------------------------------------
+# get_valid_container_id()
+#
+# - Returns a valid, unused container ID
+# - If provided ID is valid, returns it
+# - Otherwise increments from suggested ID until a free one is found
+# - Calls validate_container_id() to check availability
+# ------------------------------------------------------------------------------
+get_valid_container_id() {
+  local suggested_id="${1:-$(pvesh get /cluster/nextid)}"
+
+  while ! validate_container_id "$suggested_id"; do
+    suggested_id=$((suggested_id + 1))
+  done
+
+  echo "$suggested_id"
+}
+
 # ------------------------------------------------------------------------------
 # find_host_ssh_keys()
 #
@@ -483,7 +577,15 @@ base_settings() {
   RAM_SIZE="${final_ram}"
   VERBOSE=${var_verbose:-"${1:-no}"}
   PW=${var_pw:-""}
-  CT_ID=${var_ctid:-$NEXTID}
+  
+  # Validate and set Container ID
+  local requested_id="${var_ctid:-$NEXTID}"
+  if ! validate_container_id "$requested_id"; then
+    msg_warn "Container ID $requested_id is already in use. Using next available ID: $(get_valid_container_id "$requested_id")"
+    requested_id=$(get_valid_container_id "$requested_id")
+  fi
+  CT_ID="$requested_id"
+  
   HN=${var_hostname:-$NSAPP}
   BRG=${var_brg:-"vmbr0"}
   NET=${var_net:-"dhcp"}
@@ -1308,7 +1410,25 @@ advanced_settings() {
         --ok-button "Next" --cancel-button "Back" \
         --inputbox "\nSet Container ID" 10 58 "$_ct_id" \
         3>&1 1>&2 2>&3); then
-        _ct_id="${result:-$NEXTID}"
+        local input_id="${result:-$NEXTID}"
+
+        # Validate that ID is numeric
+        if ! [[ "$input_id" =~ ^[0-9]+$ ]]; then
+          whiptail --backtitle "Proxmox VE Helper Scripts" --title "Invalid ID" --msgbox "Container ID must be numeric." 8 58
+          continue
+        fi
+
+        # Check if ID is already in use
+        if ! validate_container_id "$input_id"; then
+          if whiptail --backtitle "Proxmox VE Helper Scripts" --title "ID Already In Use" \
+            --yesno "Container/VM ID $input_id is already in use.\n\nWould you like to use the next available ID ($(get_valid_container_id "$input_id"))?" 10 58; then
+            _ct_id=$(get_valid_container_id "$input_id")
+          else
+            continue
+          fi
+        else
+          _ct_id="$input_id"
+        fi
         ((STEP++))
       else
         ((STEP--))
diff --git a/tools/addon/all-templates.sh b/tools/addon/all-templates.sh
index 59bba3256..ed06360a5 100644
--- a/tools/addon/all-templates.sh
+++ b/tools/addon/all-templates.sh
@@ -42,6 +42,29 @@ function msg() {
   local TEXT="$1"
   echo -e "$TEXT"
 }
+function validate_container_id() {
+  local ctid="$1"
+  # Check if ID is numeric
+  if ! [[ "$ctid" =~ ^[0-9]+$ ]]; then
+    return 1
+  fi
+  # Check if config file exists for VM or LXC
+  if [[ -f "/etc/pve/qemu-server/${ctid}.conf" ]] || [[ -f "/etc/pve/lxc/${ctid}.conf" ]]; then
+    return 1
+  fi
+  # Check if ID is used in LVM logical volumes
+  if lvs --noheadings -o lv_name 2>/dev/null | grep -qE "(^|[-_])${ctid}($|[-_])"; then
+    return 1
+  fi
+  return 0
+}
+function get_valid_container_id() {
+  local suggested_id="${1:-$(pvesh get /cluster/nextid)}"
+  while ! validate_container_id "$suggested_id"; do
+    suggested_id=$((suggested_id + 1))
+  done
+  echo "$suggested_id"
+}
 function cleanup_ctid() {
   if pct status $CTID &>/dev/null; then
     if [ "$(pct status $CTID | awk '{print $2}')" == "running" ]; then
@@ -76,7 +99,15 @@ TEMPLATE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "All Templat
 # Setup script environment
 NAME=$(echo "$TEMPLATE" | grep -oE '^[^-]+-[^-]+')
 PASS="$(openssl rand -base64 8)"
+
+# Get valid Container ID
 CTID=$(pvesh get /cluster/nextid)
+if ! validate_container_id "$CTID"; then
+  warn "Container ID $CTID is already in use."
+  CTID=$(get_valid_container_id "$CTID")
+  info "Using next available ID: $CTID"
+fi
+
 PCT_OPTIONS="
     -features keyctl=1,nesting=1
     -hostname $NAME
diff --git a/turnkey/turnkey.sh b/turnkey/turnkey.sh
index bbfa7e128..6b53cf747 100644
--- a/turnkey/turnkey.sh
+++ b/turnkey/turnkey.sh
@@ -42,6 +42,29 @@ function msg() {
   local TEXT="$1"
   echo -e "$TEXT"
 }
+function validate_container_id() {
+  local ctid="$1"
+  # Check if ID is numeric
+  if ! [[ "$ctid" =~ ^[0-9]+$ ]]; then
+    return 1
+  fi
+  # Check if config file exists for VM or LXC
+  if [[ -f "/etc/pve/qemu-server/${ctid}.conf" ]] || [[ -f "/etc/pve/lxc/${ctid}.conf" ]]; then
+    return 1
+  fi
+  # Check if ID is used in LVM logical volumes
+  if lvs --noheadings -o lv_name 2>/dev/null | grep -qE "(^|[-_])${ctid}($|[-_])"; then
+    return 1
+  fi
+  return 0
+}
+function get_valid_container_id() {
+  local suggested_id="${1:-$(pvesh get /cluster/nextid)}"
+  while ! validate_container_id "$suggested_id"; do
+    suggested_id=$((suggested_id + 1))
+  done
+  echo "$suggested_id"
+}
 function cleanup_ctid() {
   if pct status $CTID &>/dev/null; then
     if [ "$(pct status $CTID | awk '{print $2}')" == "running" ]; then
@@ -99,9 +122,26 @@ turnkey=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "TurnKey LXCs
 # Setup script environment
 PASS="$(openssl rand -base64 8)"
 # Prompt user to confirm container ID
-  CTID=$(whiptail --backtitle "Container ID" --title "Choose the Container ID" --inputbox "Enter the conatiner ID..." 8 40 $(pvesh get /cluster/nextid) 3>&1 1>&2 2>&3)
+while true; do
+  CTID=$(whiptail --backtitle "Container ID" --title "Choose the Container ID" --inputbox "Enter the container ID..." 8 40 $(pvesh get /cluster/nextid) 3>&1 1>&2 2>&3)
+
+  # Check if user cancelled
+  [ -z "$CTID" ] && die "No Container ID selected"
+
+  # Validate Container ID
+  if ! validate_container_id "$CTID"; then
+    SUGGESTED_ID=$(get_valid_container_id "$CTID")
+    if whiptail --backtitle "Container ID" --title "ID Already In Use" --yesno "Container/VM ID $CTID is already in use.\n\nWould you like to use the next available ID ($SUGGESTED_ID)?" 10 58; then
+      CTID="$SUGGESTED_ID"
+      break
+    fi
+    # User declined, loop back to input
+  else
+    break
+  fi
+done
 # Prompt user to confirm Hostname
-  HOST_NAME=$(whiptail --backtitle "Hostname" --title "Choose the Hostname" --inputbox "Enter the containers Hostname..." 8 40 "turnkey-${turnkey}" 3>&1 1>&2 2>&3)
+HOST_NAME=$(whiptail --backtitle "Hostname" --title "Choose the Hostname" --inputbox "Enter the containers Hostname..." 8 40 "turnkey-${turnkey}" 3>&1 1>&2 2>&3)
 PCT_OPTIONS="
     -features keyctl=1,nesting=1
     -hostname $HOST_NAME
@@ -206,8 +246,8 @@ echo "TurnKey ${turnkey} password: ${PASS}" >>~/turnkey-${turnkey}.creds # file
 TUN_DEVICE_REQUIRED=("openvpn") # Setup this way in case future turnkeys also need tun access
 if printf '%s\n' "${TUN_DEVICE_REQUIRED[@]}" | grep -qw "${turnkey}"; then
   info "${turnkey} requires access to /dev/net/tun on the host. Modifying the container configuration to allow this."
-  echo "lxc.cgroup2.devices.allow: c 10:200 rwm" >> /etc/pve/lxc/${CTID}.conf
-  echo "lxc.mount.entry: /dev/net/tun dev/net/tun none bind,create=file 0 0" >> /etc/pve/lxc/${CTID}.conf
+  echo "lxc.cgroup2.devices.allow: c 10:200 rwm" >>/etc/pve/lxc/${CTID}.conf
+  echo "lxc.mount.entry: /dev/net/tun dev/net/tun none bind,create=file 0 0" >>/etc/pve/lxc/${CTID}.conf
   sleep 5
 fi