The cost of window security bars can vary widely based on several factors, including the material, size, design, and installation requirements. On average, the cost for window security bars ranges from $100 to $1,000 per window.
1. **Material**: 
   - **Steel**: Steel bars are the most common and typically cost between $100 and $500 per window. They are durable and provide a high level of security.
   - **Aluminum**: These are lighter and more resistant to rust, costing around $150 to $600 per window.
   - **Wrought Iron**: Known for their decorative appeal, these can range from $200 to $1,000 per window, depending on the complexity of the design.
2. **Size and Design**: 
   - Standard-sized, simple designs are on the lower end of the price spectrum.
   - Custom designs or larger windows will increase the cost significantly, potentially reaching up to $1,000 or more per window.
3. **Installation**: 
   - Professional installation can add $50 to $200 per window to the total cost. Complex installations, such as those requiring custom fitting or additional security features, may cost more.
4. **Additional Features**: 
   - Features like quick-release mechanisms for emergency exits or decorative elements can increase the price.
5. **Location**: 
   - Prices can also vary based on geographic location due to differences in labor costs and local market conditions.
Overall, while basic security bars can be relatively affordable, opting for custom designs, high-quality materials, or professional installation will increase the overall cost. It's advisable to get multiple quotes from suppliers and installers to find the best deal for your specific needs.