Free Online Roof Cost Calculator | Washington DC, MD, VA

A new roof in the Washington DC metro area typically costs between $9,500 and $22,000 for a standard 2,500 sq ft asphalt shingle roof, with slate, tile, and standing-seam metal roofs ranging from $25,000 to $80,000 or more depending on material, roof complexity, and access. The Maggio Roofing online calculator below estimates your specific project based on roof size, material, pitch, and removal requirements, using pricing data we update quarterly across Washington DC, Montgomery County, and Northern Virginia.

Estimate Your Roof Cost

Use the calculator below to get an instant price range for your home. No appointment, no phone call, no email required to see your estimate.

How Maggio Calculates Roof Costs in Washington DC

Our pricing model is built from over 10,000 roofs installed in the DC metro area since 1989. The calculator factors in five variables that drive the real cost of a roof replacement in this market:

• Roof size (squares). A “square” is 100 square feet of roof surface. Most DC row houses run 8–14 squares; detached Bethesda and Chevy Chase homes typically run 20–35 squares.
• Material. Asphalt shingle is the most common; slate, tile, copper, and standing-seam metal are common on historic DC and inner-suburb homes and cost 3–6x more than asphalt.
• Pitch and complexity. Steep roofs, multiple dormers, valleys, and skylights add labor time and safety equipment cost.
• Tear-off vs. layover. Most DC permits now require full tear-off; layover is rarely permitted and never recommended on roofs with existing damage.
• Access and staging. Row houses with no rear access, tight alleys, or three-story walk-ups carry a labor surcharge.

DC Metro Roof Cost Ranges by Material

The following ranges reflect typical Maggio Roofing installed pricing in 2026 for a complete roof replacement including tear-off, underlayment, flashing, and standard accessories. Actual project pricing depends on the variables above.

• Architectural asphalt shingle: $9,500–$22,000 for a typical home
• Premium / designer asphalt shingle: $14,000–$32,000
• Standing-seam metal: $28,000–$65,000
• Natural slate: $35,000–$90,000+
• Clay or concrete tile: $30,000–$70,000
• Flat / low-slope (TPO, modified bitumen, built-up): $12,000–$35,000 depending on square footage and substrate condition
• Copper (standing seam or flat-lock): $50,000–$150,000+

Frequently Asked Questions About Roof Costs in Washington DC

How much does a new asphalt shingle roof cost in Washington DC?

A new architectural asphalt shingle roof in the Washington DC metro area typically costs between $9,500 and $22,000 for a standard 2,500 sq ft home. Pricing depends on roof size, pitch, complexity, and tear-off requirements. Premium designer shingles run $14,000–$32,000 for the same home.

How much does a slate roof cost in DC?

Natural slate roof replacement in Washington DC ranges from $35,000 to $90,000 or more, depending on slate type (Vermont, Buckingham, synthetic), roof complexity, and whether existing slate can be salvaged. Slate roofs last 75–150 years when properly installed, which is why they remain common on historic DC, Bethesda, and Chevy Chase homes.

How much does a flat roof cost to replace on a DC row house?

Replacing a flat roof on a typical Washington DC row house costs $12,000–$25,000 for a TPO or modified bitumen system, including tear-off of the existing roof, new insulation where required, and parapet wall flashing. Larger row houses or those needing structural repair to the roof deck can run $25,000–$35,000.

Do I need a permit to replace my roof in Washington DC?

Yes. The District of Columbia requires a building permit for any roof replacement. Permits typically cost $100–$400 depending on project value. Montgomery County, Prince George’s County, Arlington, and Alexandria all have similar permit requirements. Maggio Roofing pulls all required permits as part of every project.

How long does a roof replacement take?

A typical asphalt shingle roof replacement on a DC-area home takes 1–2 days. Slate, tile, and standing-seam metal roofs take 1–3 weeks depending on size and complexity. Flat roof replacements on row houses typically take 2–4 days.

How long does a roof last in the Washington DC climate?

In the DC metro climate, asphalt shingle roofs typically last 20–30 years, standing-seam metal lasts 40–70 years, natural slate lasts 75–150 years, and clay tile lasts 50–100 years. Flat roof membranes (TPO, modified bitumen, EPDM) typically last 15–25 years.

Is it cheaper to repair or replace my roof?

Roof repair is typically cheaper when damage is localized and the rest of the roof has more than 5 years of useful life remaining. Replacement is more economical when the roof is past 75% of its expected lifespan, has multiple leak locations, or shows widespread granule loss, curling, or deck damage. A Maggio inspection includes a recommendation either way with photos of what we find.

What is included in the Maggio Roofing estimate?

Every Maggio Roofing estimate includes: complete tear-off of existing roofing, disposal, new ice and water shield at eaves and valleys, synthetic underlayment, new flashing at all penetrations and walls, new drip edge, new pipe boots, new ridge vent where applicable, the roofing material you select, permits, and a written labor and material warranty. There are no hidden fees, and the price you see is the price you pay.

Service Areas

Maggio Roofing serves Washington DC, Bethesda, Chevy Chase, Silver Spring, Takoma Park, Potomac, McLean, Arlington, Alexandria, Annandale, Brookland, Palisades, and surrounding Montgomery County, Maryland and Northern Virginia communities. Founded in 1989, we are a GAF Master Elite contractor, BBB accredited, and licensed in DC, MD, and VA.

Ready for a no-pressure roof inspection? Schedule your free in-home estimate with a Maggio craftsman, or call (301) 891-1390.