We know you want a quick answer to how much it will cost to replace your commercial roof. However, the per square foot cost depends on a variety of factors. Here are some that contribute to the price.

An Overview of Commercial Roof Replacement Cost

Before we dive into commercial roof replacement, it’s worth noting that the roofing industry has recently struggled with both material and labor shortages. Of course, this will affect your roofing project’s labor and per square foot costs.

Consider talking with your roofing professional about how maintenance and repair projects can extend the life of your existing roof. Also, the weathertight layer on new coating systems is designed to extend the service life of some types of commercial roofs by protecting them from ultraviolet (UV) degradation and weathering.

However, sometimes roof replacement can’t be avoided. Here is what is typically factored into the cost of replacing the roof on a commercial building.

Factors That Determine the Cost of Roof Replacement:

Roofing Materials

One of the most significant factors in the roof replacement cost for commercial buildings is the materials used. And unlike residential roofing projects that use a lot of asphalt shingles, there are many commercial roofing systems and brands designed for “flat roofs.”

There are a lot of factors to consider when choosing a system. For example, metal roofing tends to be more expensive to replace than built-up bituminous roofing. However, a metal roof lasts longer.


The location of your commercial building also is a factor in roof replacement costs. Certainly, the cost of labor varies throughout the country. However, the local climate and code requirements also are factors.

For example, if your roof structure and system have to withstand hurricane-force winds, your “flat roof” may require a strong fastening system. And those with commercial flat roofs in California also may be required to replace their roofs with a cool roof system.


Replacing a commercial roof on a one-story warehouse standing alone on the Kansas prairie is less complicated than putting a new roof on a skyscraper in L.A. – even if the square footage is the same.

Roof installation access is another significant factor that can affect your costs. This can include the height of the building, whether it is occupied during the project and the availability of a storage area for roofing materials.

Roofing Warranties

You may choose a type and brand of roofing material based on the warranty offered by the company. While some roofing contractors only offer a single roofing system, others may have a variety to choose from, which will undoubtedly affect the replacement cost.


Along with the cost of commercial roofing materials and installation, you must consider labor costs. The average commercial roofing project requires at least three workers – one to tear off the old roof and two to install the new system.

However, you may need more workers if your commercial building is large or has a complicated roofline. Also, if the commercial roofing project requires working around skylights or HVAC systems, you may need more workers to complete the project.

Cost of Replacing Commercial Roofs: FAQs

How much does replacing a commercial roof cost?

The cost of a commercial roof replacement can vary greatly depending on the size and type of roof you have. For example, a small flat roof on a single-story office building may cost over $80,000.00 to replace, not including tear-off, while a large pitched roof on a multistory warehouse could cost over $200,000. The best way to get an accurate estimate for your situation is to consult a reputable contractor specializing in commercial roofs.

How do you estimate commercial roofing costs?

The costs of commercial roofing can vary greatly depending on materials and labor. For example, a simple asphalt shingle roof can cost as little as $7.00 per square foot, while a more complex metal or tile roof can cost upwards of $9.00 per square foot, not including tear-off. Of course, these prices also depend on the size and scope of the project, as well as the region in which you live.

How long does it take to reroof a commercial building?

It all depends on the size of the commercial building and the type of roofing material used. Generally, reroofing a commercial building will take a few days to six weeks. The larger the building, naturally, the longer it will take. Metal roofs will usually take less time than shingle roofs. Other factors can contribute to the length of time a replacement takes, such as whether or not an existing roof needs to be removed first and if there are any special considerations (such as a parapet).

What roof is typically used in commercial roofing?

Three types of roofing systems commonly used in commercial roofing are TPO, PVC, and coating systems. Each has its own advantages and disadvantages, so choosing the right one will depend on the specific needs of your project.

Do You Need to Replace a Commercial or Industrial Roof?

While we understand that cost plays a huge role when replacing a commercial flat roof, that shouldn’t be the only factor when choosing a roofing contractor. Not all roofing companies are the same.

For commercial roof replacement in Orange County or any region in California, contact AAA Roofing. Our roofing company works with all of the leading roofing systems manufacturers, and we will recommend the best one for your building. Start by scheduling a free inspection!