Roofing Blog

Cost of roofing a house

Roofs are as important as any other part of a house. Researching types of roofing before you get a new roof or repair one is always recommended. The investment you have to make is significant and it will depend on a number of factors. Some of the factors that decide on the amount spend for a new roof are:

  • make and material of the roof
  • the location of the house
  • your preference of a particular design or style
  • the size of the roof
  • the way of installation
  • the pitch of the roof

Additional installations of pipes, eaves-trough and chimneys would increase the cost of installation.

Size of the roof

First and foremost, the size of the roof has to be measured. This would provide an approximate amount of material required for completing the roof. Square is the measure used for measuring roofs, where one square translates to 100 square feet. It is estimated that an average house would be about 3000 square feet which translates to 30 squares.

The exact measure can be calculated by measuring the base of the house. Homes with irregular shapes can be divided into geometrical shapes. Once the size of each shape is calculated, it can be added to get the total size.

Finding the pitch

pitch of roofThe second step would be to figure out the pitch of the roof. Pitch is basically the angle of the roof. Its calculated on the basis of a ratio. The steeper it is, the costlier it gets to install the roof. Most roofs have a pitch that is about 6-12, which denotes that for every 12 inches of the roof horizontally, it rises 6 inches. The pitch can be calculated by the use of a level by placing it horizontally against the roof rafter’s bottom. Vertically measuring from the 12-inch mark will give the pitch of the roof.

Determining the number of shingles

It is common to over or under estimate how many shingles are needed for a roof. A 10% waste margin is always calculated in case shingles are damaged while installing, they can be easily replaced. The cost of a single 3 tab shingles is said to be around $65 – $78. So, on a whole roof – required shingles cost anywhere from $2,600 to $3,200.

Materials required forĀ underlay

It is not just the shingles that go into the roof, but it needs to keep things in place. You can either go for 15 lb felt or 30 lb felt to do this, but 30 lb felt covers only half the squares that 15 lb squares do. 15 lb and 30 lb felt would cost $160 and $320 respectively. Ice and water shield can be added, and it would cost about $100 in total.

Another option is to go for the ridge vent. The four-foot sections of ridge vent cost $10 per roll. It can help reduce the cost.

Roof replacement

If you are looking to replace your roof, it would require another $1,000 on an average to tear down the already existing roof.

Labor cost

The labor cost is calculated by the company you have hired for installation. Most of the companies go for an average of $50 per square. It is not an easy process and does require a lot of energy and effort put into it. This would add up to $1,500 per a roof measuring 30 squares or 3,000 square feet.


Adding up all these expenses brings us to the total of $6,200 approximately. But there are additional charges that come up during the course such as traveling, additional supplies and more which would increase the final price.

So, the cost would usually be around $8,000 – $10,000 depending on the company you hire to do the work.

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