Commercial Roof Replacement Timeline (What to Expect)
Commercial roof replacement is a significant undertaking for any business or property owner. Understanding the timelines involved is crucial, whether you’re planning a roof replacement for your:
- Office building
- Warehouse
- Retail space
In this comprehensive guide, we will delve into the various aspects of commercial roof replacement, including when you should consider it, how long it takes, the steps in the process, different roof styles, and the associated costs.
Understanding Commercial Roofing Systems

Commercial roofing systems are designed to provide a watertight seal and protect the building’s contents from the elements. Understanding the different types of commercial roofing systems is essential for building owners and managers to make informed decisions about their roofing needs. Commercial roofing systems can be broadly classified into several categories, each with its unique characteristics, advantages, and disadvantages.
When Should You Replace Your Commercial Roof?
Before diving into the timelines, it’s essential to know when your commercial roof requires replacement. Waiting too long can lead to extensive damage and costly repairs. Here are some signs that indicate it’s time to replace your commercial roof:
- Age of the Roof: The typical lifespan of a commercial roof varies depending on the material used. Most commercial roofs last between 20 to 30 years. If your roof is approaching or has exceeded this age range, it’s time to start considering a replacement.
- Frequent Leaks and Repairs: If you find yourself constantly dealing with leaks and requiring frequent repairs, it’s a clear sign that your roof’s integrity has been compromised. These recurring issues can be more expensive in the long run than investing in a replacement.
- Visible Damage: Inspect your roof regularly for visible damage, such as cracks, blisters, or sagging areas. Any of these issues can indicate structural problems that require immediate attention.
- Energy Efficiency Concerns: An inefficient roof can significantly impact your energy bills. If you notice a spike in heating or cooling costs, it might be due to an aging or deteriorating roof that’s no longer providing adequate insulation.
- Mold and Mildew Growth: Excessive moisture and poor ventilation can lead to mold and mildew growth within your building. If you spot these issues on the interior of your property, it’s a red flag that your roof isn’t effectively keeping out moisture.
Pre-Construction Process
Before starting a commercial roofing project, it is essential to follow a pre-construction process to ensure that the project is completed successfully and efficiently. This process involves several critical steps that lay the groundwork for a smooth and effective roofing replacement.
Inspection and Assessment
The first step in the pre-construction process is to conduct a thorough inspection and assessment of the existing roof. This involves evaluating the condition of the roof, identifying any damage or defects, and determining the best course of action for repairs or replacement. A professional roofing contractor will use specialized equipment and techniques to inspect the roof and provide a detailed report of their findings. This assessment helps in planning the project accurately and avoiding unexpected issues during the replacement process.
Permitting and Approvals
Once the inspection and assessment are complete, the next step is to obtain the necessary permits and approvals from local authorities. This may involve submitting detailed plans and specifications for the roofing project, as well as paying any required fees. A professional roofing contractor will handle the permitting and approval process to ensure that the project complies with all local building codes and regulations. Securing the proper permits is crucial to avoid legal complications and ensure the project proceeds without delays.
How Long Does a Commercial Roof Replacement Take?

The timeline for a commercial roof replacement can vary based on several factors, including the size and complexity of the project, weather conditions, and the roofing material chosen. However, a rough estimate can give you an idea of what to expect.
Planning and Preparation (1-2 Weeks)
Before any physical work begins, you’ll need to plan the replacement project. This involves obtaining permits, selecting roofing materials, and hiring a contractor. The planning phase typically takes one to two weeks, but it can be longer for more complex projects.
Removal of Existing Roof (1-2 Days)
Once the planning is complete, the existing roof needs to be removed. This process can take one to two weeks, depending on the size of the roof and the complexity of removal.
Roof Deck Inspection and Repair (1 Day)
After the old roof is removed, the roof deck will be inspected for any damage or rot. Any necessary repairs or replacements can add another one to two weeks to the timeline.
Installation of New Roofing Material (1-2 Days)
The installation of the new roofing material is a crucial phase. The timeline for this step can vary significantly depending on the type of roofing material chosen and the size of the roof. For example, single-ply membrane roofing can be installed relatively quickly, while a complex metal roofing system may take longer.
Final Inspections and Clean-Up (1 Day)
After the new roof is installed, it will undergo final inspections to ensure it meets all safety and quality standards. This phase, along with clean-up, can take one to two weeks.
Total Timeline: Approximately 2 Weeks
Taking all these phases into account, a commercial roof replacement project typically takes around 2 weeks to complete. However, it’s essential to remember that unexpected delays, such as adverse weather conditions, can extend the timeline.
6 Steps in the Commercial Roof Replacement Process
Now, let’s break down the steps involved in a commercial roof replacement project:
1. Assessment and Planning
- Conduct a thorough inspection of the existing roof.
- Determine the scope of the project and select the roofing material.
- Obtain any necessary permits and approvals.
- Plan the project timeline and budget.
2. Old Roof Removal
- Remove the existing roofing material and dispose of it properly.
- Inspect the roof deck for any structural issues.
3. Roof Deck Repair
- Repair or replace any damaged sections of the roof deck.
- Ensure the deck is in optimal condition to support the new roof.
4. Installation of New Roofing Material
- Apply the chosen roofing material according to manufacturer guidelines.
- Ensure proper insulation and ventilation are in place.
- Seam and seal the roofing material for maximum durability.
5. Final Inspections
- Inspect the newly installed roof for any defects or issues.
- Ensure all safety standards are met.
- Obtain necessary certifications and warranties.
6. Clean-Up and Site Restoration
- Remove any debris and waste from the construction site.
- Restore the site to its original condition.
- Ensure proper disposal of old roofing material.
Different Commercial Roof Styles
Commercial roofs come in various styles and materials, each with its advantages and disadvantages. Here are some common commercial roof styles:
Flat Roof
- Suitable for buildings with limited space for a pitched roof.
- Typically uses materials like single-ply membrane or built-up roofing.
- Requires regular maintenance to prevent water pooling.
Metal Roof
- Durable and long-lasting.
- Energy-efficient and reflects sunlight.
- Requires minimal maintenance but can be noisy in heavy rain.
TPO Roof
- Thermoplastic Olefin (TPO) roofing is energy-efficient and highly reflective.
- Resistant to chemical and UV damage.
- Known for its ease of installation.
EPDM Roof
- Ethylene Propylene Diene Monomer (EPDM) roofing is durable and cost-effective.
- Resistant to weathering and UV radiation.
- Suitable for low-slope roofs.
Green Roof
- A sustainable option with vegetation and planting on the roof.
- Provides insulation and reduces heat buildup.
- Requires specialized maintenance.
The Cost to Replace Your Commercial Roof
The cost of a commercial roof replacement can vary widely depending on several factors, including the size of the roof, the chosen roofing material, and the complexity of the project. Here’s a rough cost estimate for different roofing materials:
- Flat Roof (Single-Ply Membrane): $3.50 to $7.50 per square foot.
- Metal Roof: $5.00 to $12.00 per square foot.
- TPO Roof: $4.00 to $8.00 per square foot.
- EPDM Roof: $3.50 to $7.00 per square foot.
- Green Roof: $10.00 to $25.00 per square foot.
It’s important to note that these are ballpark figures, and the actual cost can vary based on location, labor costs, and any additional features or requirements for your specific project.
Post-Replacement Process
After the new roofing system is installed, it is essential to follow a post-replacement process to ensure that the roof is properly maintained and protected. This process involves understanding the warranty and implementing a regular maintenance schedule to extend the life of the roofing system.
Warranty and Maintenance for Your New Roofing System
A professional roofing contractor will provide a warranty for the new roofing system, which typically covers defects in materials and workmanship for a specified period. It is essential to understand the terms and conditions of the warranty, including what is covered and what is not. Regular maintenance is also crucial to extend the life of the roofing system and prevent costly repairs. A professional roofing contractor will provide guidance on maintenance schedules and procedures to ensure that the roof remains in good condition. This may include regular inspections, cleaning, and minor repairs to address any issues before they escalate.
By following these post-replacement steps, building owners can ensure their new roofing system remains durable and effective for years to come.
Learn More About Your Commercial Roof Replacement Cost
A commercial roof replacement is a significant investment that requires careful consideration of when to replace your roof, how long the process takes, the steps involved, different roof styles, and associated costs. Proper planning and hiring a reputable contractor are essential for a successful roof replacement project that ensures the longevity and safety of your commercial property.
Contact Built Right Roofing today to learn how much your commercial flat roof will cost!