Modified bitumen roofing is known for its reliability—but how much does it cost? Get the facts to plan your next roofing project.
Modified Bitumen Roof Cost Breakdown
| Category | Lowest Cost | Highest Cost | Average Cost |
| Cost per Square Foot | $4.00 | $7.50 | $5.75 |
| Total Cost for Roof | $4,800 | $14,600 | $9,700 |
Whether it’s your first roof or a replacement, learn how much a modified bitumen system could cost and how to get the most value.
| Type of Modified Bitumen | Cost per Square Foot (Installed) | Estimated Total Cost (1,200 sq. ft. roof) | Key Factors Influencing Cost |
| SBS (Styrene-Butadiene-Styrene) | $3.50 and $6.50 | $9.50–$14.50 | Flexibility, cold climate suitability, and labor intensity |
| APP (Atactic Polypropylene) | $4–$8 | $4,800 -$9,600 | High-temperature resistance and UV stability |
| SEBS (Styrene-Ethylene-Butylene-Styrene) | $5.50 – $8.00 | $6,600 – $9,600 | Durability, elasticity, and advanced polymer technology |
| Oxidized Bitumen | $4.00 – $6.00 | $4,800 – $7,200 | Simplicity, low flexibility, and basic properties |
| CRMB (Crumb Rubber Modified Bitumen) | $5.00 – $8.50 | $6,000 – $10,200 | Eco-friendly materials and enhanced performance |
Modified bitumen roof cost
When considering a new roofing system, understanding the modified bitumen roof cost per square foot is essential for budgeting and decision-making. Bitumen roof cost typically ranges between $4–$8 per square foot, depending on factors like material quality and installation complexity. Whether you’re exploring the modified bitumen price for residential or commercial applications, it’s important to factor in both upfront expenses and long-term durability. By examining these modified bitumen cost factors, you can determine the best option that balances value, performance, and longevity for your roofing needs.
Types of Modified Bitumen Roofing
SBS (Styrene-Butadiene-Styrene) Modified Bitumen
SBS is highly flexible, making it ideal for colder climates as it stays elastic in low temperatures and resists cracking. Commonly used in regions with fluctuating temperatures, SBS-modified bitumen roofing cost typically ranges from $5.00 to $8.00 per square foot, offering durable protection in harsh conditions.
APP (Atactic Polypropylene) Modified Bitumen
APP is more rigid than SBS and offers excellent resistance to high temperatures and UV rays, making it ideal for hot climates. It provides superior durability and is commonly used for commercial and industrial roofs in areas with intense sunlight. The APP-modified bitumen cost typically ranges from $4.00 to $7.00 per square foot, offering a cost-effective solution for roofs in warmer regions.
SEBS (Styrene-Ethylene-Butylene-Styrene) Modified Bitumen
SEBS is an advanced version of SBS, offering enhanced durability, flexibility, and elasticity in both hot and cold climates. It’s a premium choice for extreme weather conditions and energy-efficient roofing systems.
Oxidized Bitumen
Oxidized bitumen is a more cost-effective option, created by oxidizing petroleum bitumen. While it is not as flexible as SBS or APP, it provides excellent waterproofing and is suitable for industrial or basic roofing needs.
Crumb Rubber Modified Bitumen (CRMB)
CRMB is made by adding recycled rubber to bitumen, offering increased durability and flexibility. It is eco-friendly and ideal for applications that require enhanced resistance to wear, such as roads or parking lots.
Each type of modified bitumen roofing has unique properties, making it suitable for different climates, budgets, and building requirements.
Modified Bitumen Roof cost vs other types of flat roof cost
| Roof Type | Average Cost (Per Square Foot) | What’s Included |
| Modified Bitumen Roof cost | $4 – $8 | Material, installation, waterproofing, longevity up to 20 years |
| Built-Up Roof Cost | $5 – $10 | Multi-layer construction, gravel top, long-lasting durability |
| TPO (Thermoplastic Olefin) Roof Cost | $5.50 – $9.50 | Heat-welded seams, reflective surface, energy efficiency |
| EPDM Roof Cost | $4 – $8 | Flexible rubber, UV resistance, low maintenance |
| PVC Roof Cost | $7 – $12 | Chemical resistance, reflective finish, eco-friendly options |
Modified bitumen roofing offers several advantages, making it a popular choice for both residential and commercial buildings. It provides excellent durability, with resistance to extreme temperatures, UV rays, and weathering. The material’s flexibility allows it to adapt to roof movement, reducing the risk of cracking. Modified bitumen roofs are also highly waterproof, offering superior protection against leaks. Additionally, they are relatively low-maintenance and can last for decades when properly installed. Available in different types, such as SBS and APP, modified bitumen can be tailored to suit various climate conditions and building needs.
Factors that impact on the cost of Modified Bitumen Roof
| Factor | Impact on Cost |
| Material Type | Different types (SBS, APP, SEBS, CRMB) vary in price based on flexibility, durability, and climate suitability. |
| Roof Size | Larger roofs require more materials and labor, increasing overall costs. |
| Labor and Installation Complexity | More complex installations (e.g., slopes, features) or higher labor rates raise costs. |
| Roof Condition and Preparation | If the existing roof requires removal or repairs, this adds to material and labor costs. |
| Geographic Location | Location affects transportation costs, labor rates, and potential price variations based on regional demand. |
| Quality of Materials | Premium materials with higher durability and resistance increase material costs. |
| Roof Design and Features | Complex designs or additional features (e.g., skylights) increase the time, labor, and materials required. |
| Weather and Seasonality | Roofing costs can fluctuate depending on the season, with peak demand leading to higher prices. |
| Warranty and Lifespan | Roof systems with extended warranties or longer lifespans generally have a higher initial cost. |
| Insulation and Energy Efficiency | Additional insulation or energy-efficient features can raise the upfront cost but offer long-term savings. |
Conclusion
Modified bitumen roofing is a reliable and durable option, with costs ranging based on material type, roof size, and installation complexity. In 2025, the modified bitumen roof cost per square foot typically falls between $4.00 and $8.00, with total replacement costs averaging around $9,700 for a standard 1,200 sq. ft. roof. The price can vary depending on the specific type of modified bitumen used, such as SBS, APP, or SEBS, each offering unique benefits for different climates and building needs.
When planning your roofing project, consider the factors that influence cost, such as the roof’s size, design complexity, and geographical location. While modified bitumen may have a higher upfront cost compared to other flat roofing systems, its long-term durability, low maintenance, and weather resistance make it a cost-effective choice in the long run.
Reach out to a professional roofing consultant to get a precise estimate based on your specific needs and to ensure your modified bitumen roof is installed correctly for maximum performance.
Frequently Asked Questions
It typically ranges from $4.00 to $8.00 per square foot, depending on the material and installation complexity.
Factors include material type (SBS, APP, SEBS), roof size, location, and the condition of the existing roof.
It lasts 15 to 20 years or more with proper maintenance.
Yes, SBS is ideal for cold climates, while APP is better for hot climates.
It offers durability, weather resistance, water proofing, and requires low maintenance.
