Steel door costs vary based on size, insulation level, and customization options, typically ranging from $800 to $3,000 installed. The investment pays back through energy savings over time.Basic steel doors with standard insulation start around $800-1,200 installed. Mid-range options with enhanced insulation and some custom features run $1,200-2,000. Premium steel doors with advanced thermal breaks and full customization can reach $2,000-3,000.Remember that many steel doors qualify for federal tax credits up to $250 per door, and some utility companies offer additional rebates for energy-efficient installations. When you factor in energy savings and increased home value, quality steel doors represent smart long-term investments.