How Contractors Determine the Price of a Roof Replacement


After inspecting the roof and speaking with homeowner, a contractor will draw up an estimate for the project. Estimating takes several important factors into consideration including materials, complexity of the job and the amount of time needed to complete the job.
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Typical Breakdown:

Roof Size 

Roofs with more slant have a larger surface area than roofs with less slant.

Roof Slope

Steeper sloped roofs are more dangerous and more difficult to work on than flat roofs.

Roof Complexity

A roof with more level changes hips and valleys, and add-ons, such as dormers, will be more expensive than a simple roof.

Existing Layers

It’s sometimes possible to install over existing shingles, but this lowers the lifespan and can cancel the warranty. It’s better to do a complete replacement. The more layers that must be removed will increase the price.

Debris and Waste Removal

Asphalt shingles, the most common material used, are considered hazardous waste and must be disposed of properly.

Materials

The type of new material that will be installed, such as asphalt shingles, steel shingles, slate shingles, etc.

Building Materials

This covers all other materials needed to replace a roof including boards and plywood for the roof deck, nails, drop cloths, tarps, staples, calk, etc.

Roof Underlayment and Accessories

Underlayment and accessories are part of a system that makes the roof complete and watertight.

Ventilation

Ventilation is very important for expanding the lifespan of a roof, increasing its energy efficiency and meeting building code requirements in some areas.

Labor Costs

Installation/labor costs will vary depending on the size and complexity of the job, the workers’ experience and how long the project will take.

Overhead Costs

This covers the basic costs of doing business (insurance, advertising, taxes, permits, office space, equipment, trucks, office supplies, office staff, etc.).



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