Roofs are priced by area, and roof area is nearly always larger than the footprint of the house because of pitch, overhangs and complicated shapes. That is why two homes of similar size can receive very different bids. This guide explains the units roofers actually use, what drives the installed price per square foot, and when a repair is the better call than a replacement. All figures are national planning estimates, not quotes.
Quick answer: Installed asphalt shingle roof replacement typically runs about $5 to $12 per square foot in the US, or roughly $500 to $1,200 per roofing square, with a 2,000 square foot roof commonly landing between $10,000 and $24,000. Metal, tile and slate cost considerably more. Tear-off, pitch, existing layers and decking repairs are the extras that move a bid most.
Cost per square foot and per square
Roofers work in squares. One square is 100 square feet of roof surface, so a 20 square roof covers about 2,000 square feet of actual roofing, not 2,000 square feet of floor plan. Bids are usually expressed as a price per square, and for asphalt shingles that often falls between roughly $500 and $1,200 installed depending on material grade, region and roof complexity. Converting a bid to a per-square-foot figure is a useful way to compare quotes that were written in different units.
Roof area is not floor area
A house with a 1,500 square foot footprint does not have a 1,500 square foot roof. Pitch stretches the surface, so a 6/12 roof has roughly 12% more area than its plan view and a steep 12/12 roof has about 41% more. Overhangs, dormers, valleys, hips and multiple roof planes all add further area. Measure the roof, or have it measured, rather than multiplying the floor plan by a guess and hoping the two agree.
What pushes the price up
Tear-off: most jurisdictions limit how many layers of shingles a roof may carry.
Pitch: steep roofs need staging, fall protection and slower work, and some crews add a steep charge.
Existing layers: each additional layer adds disposal weight and hauling cost.
Decking condition: rotten sheathing or delaminated plywood is replaced before the new roof goes on.
Roof features: valleys, dormers, skylights, chimneys and vents add cutting, flashing and labor.
Material: architectural shingles, metal, tile and slate step up in both material and installation cost.
Tear-off versus a layover
Leaving the old shingles in place and installing new material over them, sometimes called a layover or overlay, saves the tear-off labor and the dumpster cost. It is allowed in some jurisdictions and not others, and it is usually only an option when the roof already carries a single layer, the deck is sound and the flashing details are still correct. Tear-off is the better choice when there is rot, when valleys or flashing need rebuilding, or when the added weight matters. Ask which approach a bid assumes.
Repair or replace
A single leak, a few lifted or missing shingles, or damaged flashing around a vent is usually a repair. Replacement becomes the better decision when the roof is near the end of its service life, when leaks appear in several places, when granules are gone from large areas, or when an inspection finds widespread cracking or a soft deck. Spending a large sum on repairs to a worn roof is rarely good value, but replacing a sound roof early wastes money just as surely. Get an inspection that documents what was found.
Frequently Asked Questions
How much does a new roof cost for a 2,000 square foot house?
The roof area of a 2,000 square foot house is usually larger than its footprint, often 2,200 to 2,900 square feet once pitch and overhangs are counted, which is roughly 22 to 29 squares. At typical installed asphalt prices that lands near $11,000 to $35,000, with the spread coming from material grade, pitch and tear-off. Local quotes set the real number.
How long does a roof replacement take?
Most single-family asphalt roof replacements take one to three days of work once materials are on site, weather permitting. Steep or complex roofs, multiple layers of tear-off and decking repair all extend that. Materials are usually delivered the day before, and cleanup with a magnetic sweep for nails follows the final course of shingles.
Is a metal roof worth the extra cost?
Metal roofing costs more up front than asphalt but is generally expected to last considerably longer and needs little maintenance. Whether it pays off depends on how long you keep the house, your climate and local labor rates for metal work. Some metal systems also change how the roof handles snow shedding, rain noise and heat. Compare lifecycle cost rather than sticker price alone.
Can I replace a roof myself?
It is legal in many places for a homeowner to roof their own house, but steep pitches, heights, cut-in flashing and ventilation details make it one of the riskier do-it-yourself jobs. Insurance and manufacturer warranties may also be affected by owner installation. Most homeowners hire a licensed roofer for the work and handle only tear-off or cleanup.
Does a new roof require a permit?
In most US jurisdictions, yes. Roofing permits are common even for a like-for-like replacement, and inspections may cover decking, flashing and nailing. Rules vary by city and county, and some areas allow a homeowner permit for an owner-occupied house. Check with the local building department before the crew starts work.