The answer to 'how much does flat roof cost' is that the cost of a flat roof can vary significantly depending on several factors. Typically, flat roof installation can range from around $5 to $20 per square foot, with most homeowners paying between $10 to $15 per square foot on average.
The final cost will depend on the size of your roof, the roofing material used (such as EPDM, TPO, or PVC), the complexity of the installation, your location, and whether any repairs or additional work is needed. Factors like the condition of the existing roof, the need for insulation or ventilation, and accessibility to the roof can also impact the overall pricing.