Short answer: A new architectural asphalt shingle roof on a 1,200 square foot home in the DC/Maryland market typically costs between $9,000 and $16,000. Premium materials, steep pitch, multiple stories, complex roofs with valleys and dormers, or rotted decking can push it to $20,000 or more. A simple ranch with a low-pitch roof and good decking is at the low end of that range.
Homeowners often quote me their floor square footage and want a price. The problem is that floor square footage is not roof square footage. A 1,200 square foot footprint can have anywhere from 1,500 to 2,400 square feet of actual roof depending on pitch, overhangs, and complexity. The same house, two different roof shapes, can cost two different prices.
How Roofers Actually Calculate Cost
We don’t price by floor square footage. We price by roof square footage, measured in “squares.” One square equals 100 square feet. A 1,200 square foot home with a standard 6/12 pitch roof is roughly 17 to 19 squares of roof. A steep 12/12 pitch on the same footprint is closer to 22 to 25 squares.
The pricing math goes like this: cost per square (materials, labor, overhead, profit), multiplied by squares of roof, plus tear-off cost, plus any decking replacement, plus permits and dump fees.
In our market, all-in pricing for architectural asphalt shingles on a typical home runs $500 to $750 per square. That’s the number to work with.
Walking Through a Real Number
Take a typical 1,200 square foot rancher in Silver Spring with a moderate 6/12 pitch and an uncomplicated roof shape. Roof area: about 17 squares. Pricing it out:
- Architectural shingles installed: 17 squares × $600 per square = $10,200
- Tear-off of one existing layer: included in the per-square price
- Permit and dump fees: $400 to $700 depending on jurisdiction
- Decking allowance: assume sound, $0 if it is
- Total: roughly $10,600 to $10,900
Now take the same square footage but a two-story Colonial with a steeper roof, two dormers, and three valleys. Roof area: about 22 squares. Pricing:
- Architectural shingles installed: 22 squares × $675 per square (complexity premium) = $14,850
- Permit and dump fees: $500
- Total: roughly $15,350
Same floor square footage. About $4,500 difference. The shape of your roof matters as much as the size of your house.
What Drives the Price Up
A few things consistently push roofing costs higher:
- Steeper pitch. Anything over 8/12 requires safety harnesses and slows the crew down. Add 10 to 25%.
- Multiple stories. A two-story house means longer ladders, more setup time, and harder material handling. Add 10 to 15%.
- Tear-off of multiple layers. If your roof has two or three layers of old shingles, the tear-off doubles or triples in time and weight.
- Decking replacement. Rotted decking adds $75 to $150 per sheet. A roof with significant rot can add $1,500 to $4,000.
- Skylights, chimneys, and complex flashing. Each chimney or skylight is a flashing job within the larger job. Add $300 to $1,200 per item.
- Premium materials. Designer shingles like CertainTeed Grand Manor or Presidential TL run $300 to $600 more per square than standard architectural.
What Drives the Price Down
- Off-season scheduling. Winter months in our market are slower. Some contractors offer 5 to 10% discounts for jobs scheduled December through February.
- Single-layer tear-off, sound decking, simple roof shape. A clean job is a fast job, which means lower labor cost.
- Bundling work. If you’re also replacing gutters or doing siding, doing it together reduces mobilization costs.
- Cash payment. Some contractors offer small discounts for cash, since they save on credit card processing.
The Wrong Way to Compare Quotes
If you’re getting three quotes for a 1,200 square foot home and one comes in at $7,500, that’s not a deal, that’s a warning. Either they measured the roof wrong, they’re using cheap materials, they’re skipping the underlayment, or they plan to add charges later. The cost of materials alone makes anything under $400 per square unrealistic for a quality install.
Here’s a useful test. Multiply the squares of roof by $400 (rough material and labor floor) and you get the lowest possible legitimate price. Anything significantly under that means corners are getting cut. The corners get cut today, the leaks show up in three years, and you’re paying for a new roof again.
A new roof is a 25 to 30 year investment. The difference between an $11,000 quote and a $13,000 quote spread over 25 years is $80 a year. Pick the contractor who’s going to be in business in 25 years to honor the warranty, not the one who saved you $80 a year.
