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7 Factors Used to Calculate the Cost of a Roof Replacement?

January , 2023 | 11 min. read

By Nicole Corson

white home with a metal roof replacement

A full roof replacement is a hefty project, and we know that discussing the cost can sometimes be a sensitive subject.

However, it doesn’t have to be taboo. Learning about your upcoming roof replacement project is the best way to get the most value for your investment, and also understand where exactly your money is going.

Our family at RoofCrafters has been in the Southeast region replacing roofs for families just like yours, one roof at a time, for nearly 3 decades. We believe our professionalism, and demonstrated integrity throughout the entire process will deliver what we like to call the “RoofCrafters Experience.” This is what we believe separates us from the other companies in the industry, and why clients choose our family.

We’re glad you’re here because, in this article, we're going to share our 30 years of experience so you can learn about the factors that go into calculating the price of a new roof replacement. Hopefully, by the end of this article, you'll have a better understanding of the factors that impact the cost of a roof replacement. And you'll be better prepared to make a well-informed decision about your upcoming project.

Let’s jump right into the 7 key factors!

7 Factors Used to Calculate the Cost of a Roof Replacement


So you're thinking about replacing your roof and wondering how the cost is calculated? It's not as simple as just looking at the price of the materials, there are many factors to consider. 

Let's dive into the 7 key factors that can affect the final cost of your roof replacement. These 7 factors will give you a better understanding of what affects the cost of your new roof.

  1. The size of your roof
  2. The type of materials you have selected for your new roof
  3. The complexity of the roof
  4. The level of workmanship warranty
  5. Dump and transportation fees
  6. The amount of decking, rafters, or facia boards replaced
  7. The overhead cost of the roofing company
The Complexity of Your Roof
 The Level of Workmanship Warranty
Dump and Transportation Fees
The Amount of Decking, Rafters, or Fascia Boards Replaced
The Overhead Cost of the Roofing Company
1.  The Size of Your Roof

Read on to find out the details and get ready to budget for your new roof with confidence!

1.  The Size of Your Roof


The overall size or square footage of your roof will be precisely measured by your contractor. Your contractor will also need to measure all of the other parts separately in order to figure out the total cost of the materials that they'll need to complete your roof.  We also use satellite reports for these measurements when they're available. 

Measurements include:

  • Total square footage of roof area
  • Total linear feet of valleys
  • Total linear feet of hips and ridges
  • Total linear feet of fascia boards or edge of the roofline if it has exposed rafters with no fascia boards
  • Total linear feet of flashings needed
  • Any additional items such as pipes and vent

    beautiful home with a new roof

2. The Type of Materials You Have Selected for Your New Roof


The type of materials you choose will have the most impact on the cost of your new roof replacement. Of the 7 common types of roofing materials installed on houses, the 3-tab asphalt shingles are the most economical materials. The standing seam metal roof or a tile roof will provide you with the most protection, and curb appeal, and add value to your home.  

Roofing materials come with different predetermined warranties set by each manufacturer.  But keep in mind,  they're material warranties only. The roofing company you hire will cover labor warranties, sometimes called workmanship warranties. Workmanship warranties will protect and cover your home against any and all roof leaks

The materials you choose, along with the different roofing components needed will impact the cost of your new roof. A roof is a long-term investment. So it’s critical that you invest in quality, well-made materials over the cheaper options. 

Let's say you're on a tight budget and don’t want to sacrifice the quality of the roofing materials that'll be installed on your home, look into a financing option.  A low-payment option may be right for you. Financing may help you afford to upgrade the quality of materials with a low monthly payment.

3. The Complexity of Your Roof


The complexity of your roof refers to the steepness or pitch of the roof.

Will your contractor be able to walk on the roof easily? The easier it is to walk on during the initial inspection the easier it'll be to tear the old roof off and install the new roof. This will reduce the labor cost.

roofer walking on an easy pitch roof

Or is the pitch of the roof very steep?  If the roof pitch is extremely steep, it may require extra safety equipment as well as slowing down the installation. This will impact the labor cost because it may take more time to install the roof safely.

roof replacement on a steep roof

The safety of your contractor and crew is of the utmost importance. And in order to get a great installation on a steep and difficult roof, they must slow down. This will increase the labor cost. Another thing to be considered is if the crew will be able to get their equipment close enough to your property. If not, this could also potentially increase the cost of labor. 

4. The Level of Workmanship Warranty


Depending on which material you end up choosing and the manufacturer who makes those materials, each manufacturer provides their contractors with detailed installation instructions and guidelines that they are required to follow, along with all the state and local building codes. 


what is a roofing warranty and do i need one

This will impact some of the materials your contractor is required to use as well as their installation methods. For instance, to provide you with a 10-year workmanship warranty from a manufacturer requires less of a grade material and installation method. This would lower the cost, as opposed to what a 25-year workmanship warranty requires.

Some of the materials and installation methods that have an impact on the cost of your project include:

  • Underlayment or secondary waterproofing required to meet the manufacturer's warranty requirements
  • Type of metal flashing required
  • Number of fasteners needed 
  • Installation method and materials required around the penetrations (pipes, skylights, chimneys, dormers, roof-to-wall details, and all valleys)
  • Installation methods and materials are required along the edge of the roof or the perimeter of the roof.
  • Type of ventilation and installation method of the required ventilation 

This factor often comes down to the level of peace of mind, security, and protection you want for your home and family.

5. Dump and Transportation Fees


To get a new roof, the old roof will typically need to be torn off. Most roofing materials torn off will need to be taken to special construction dumps that are designed to handle all of the different materials used in the roofing products, like the petroleum in asphalt shingles. The dump fees are calculated by the type of material and the weight being dumped. 

roof replacement by RoofCrafters

Depending on the type of materials that'll be torn off, sometimes these materials can be recycled, which could reduce the cost of your new roof. Either way, to get rid of the old materials, they need to be handled by labor to be put into dump containers and then transported by a CDL class driver to a waste management provider. Because the dump process is such a labor-intensive part of the project, it'll impact the overall cost of the new roof.

6. The Amount of Decking, Rafters, or Fascia Boards Replaced


Wood decking is the substrate that the new roof material will be fastened to. The rafters are the framing that supports the wood decking. The facia boards are the boards that are attached to the rafters that provide a nice finished look at the edge of the roof.

If there's any water damage, dry rotted wood, or any deteriorated wood in your roof, that wood will need to be replaced prior to installing the new roof system. The amount of wood needed will impact the cost of your new roof.

Keep in mind that oftentimes the wood that'll need to be replaced can not be determined at the time of an onsite inspection. However, there are areas on roofs and some conditions that do not allow an estimator to see until the old roof has been removed.

In these cases, you can anticipate a change order to be applied to account for the extra wood materials and labor to have the deteriorated wood removed and the new wood installed to be added to the final cost.

7. The Overhead Cost of the Roofing Company


The number one reason 90% of roofing companies fail before year 5 is that they fail to factor in overhead or operating costs to jobs.  Every roofing company has overhead or operating costs. This is the overall cost that it takes to successfully operate the company. This is where going with the lowest bid can be a mistake in the long run.  The companies that charge the cheapest prices often go out of business. Unfortunately leaving homeowners stuck without a valid warranty. 

Some of the overhead costs that can impact the cost of your roof include:

  • General liability insurance
  • Workers compensation insurance
  • Vehicles (maintenance, fuel, and insurance)
  • Office and shop
  • Employee payroll and taxes
  • Employee training (continued education) 
  • State and local licenses and bonds
  • Marketing and advertising
  • Federal and State taxes

No matter how large or small a roof repair or a new roof project may be, these are the fixed costs that a roofing company has to factor into the cost of the project to operate their business successfully.

Image call to action, use the pricing calculator to estimate the cost of your roof replacement

Can I Do a Roof Replacement Myself?


You can research, learn, and estimate costs to replace your roof on your own, but getting in contact with a professional roofing company will always be your best bet. They'll be able to catch all the details needed to complete an entire roofing system and give you an in-depth explanation.

When it comes down to how much a new roof will cost you, and if you can afford it, any reputable roofing company will offer you financing options so you can stay within your budget. Here at RoofCrafters, we believe that a quality roof that provides protection for you and your family is not a luxury, but a right every homeowner deserves.

Image call to action, get financing for your roof replacement


If you're eager to talk to one of our friendly estimators about new roof costs, go ahead and schedule your inspection here. We'll reach out to you as soon as possible to schedule your inspection. If you'd prefer to brush up a little more on your roofing service knowledge, you can better educate yourself through the extensive resources located in our learning center.

We also recommend downloading our "Top 10 Checklist" where we share the top 10 things to check for and frequently ask questions along with the right answers to those questions so you can better prepare yourself when interviewing potential roofing partners. You'll know what should be expected of the roofing contractor you hire.

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Nicole Corson

At RoofCrafters, our mission is to provide job opportunities for others to thrive and grow while making a meaningful impact within our communities.