The most expensive part is usually paying to get the wall installed based on square feet. You can spend up to $14,000 for longer walls, while smaller ones can be closer to $3,000. You will also be looking to pay quite a bit for labor at around $50-$75 an hour. Higher-end materials will always cost more money, sometimes as much as $125 per square foot. The final price depends on several things though such as: The type of material Width, length, and height of the wall Reinforcement Decorative finishes Engineering Overall, the most expensive part is typically paying for the high-cost materials and for the labor.