RoofersCost
National guide · 46 states

Flat Roof Replacement Cost across the U.S.

Typical flat roof · U.S.
$4,000 – $15,000

A residential flat or low-slope roof replacement typically runs $4,000 to $15,000 — about $4 to $13 per sq ft installed — depending on the membrane (EPDM, TPO, PVC, or modified bitumen) and the insulation package code requires.

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Price reference · Reviewed June 2026

Flat roofing.

National installed pricing by membrane, plus insulation and tear-off.

  • EPDM (rubber)
    Single-ply rubber membrane
    $4,500 – $11,000
  • TPO
    White reflective single-ply
    $5,000 – $13,000
  • PVC
    Heat-welded seams
    $6,000 – $15,000
  • Modified bitumen
    Torch-down or self-adhered
    $4,000 – $10,000
  • Insulation (polyiso)
    Code-required R-value
    $1,000 – $4,000
  • Tear-off & disposal
    $800 – $2,500
  • Permits & inspection
    $250 – $1,000

* Pick a state for local pricing and city guides.

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What happens when you call

  1. Call the number

    Takes about two minutes — no account, no forms.

  2. Describe your roof

    Roof type, approximate size, and what you want done in your area.

  3. Talk to a licensed contractor

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Interactive

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Adjust the inputs below. The range updates live and is adjusted for your area's labor market —national-average pricing.

Your estimate
$10,000–$18,500
for your area · national-average pricing

Indicative range based on national average rates. Deck condition, flashing, and contractor overhead may shift the final invoice. Get written quotes from licensed roofing contractors before signing.

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Before you sign: the quote checklist

  • Get quotes from at least 3 licensed roofing contractors in your area.
  • Make sure every quote itemizes tear-off, underlayment, flashing, and disposal.
  • Verify licensing and insurance before hiring — ask for certificates, not promises.
  • Ask about both the material warranty and the workmanship warranty — they differ.
The national picture

What moves a flat roofing quote.

Flat and low-slope roofs price differently from pitched roofs: the bill turns on the membrane — EPDM rubber, TPO, PVC, or modified bitumen — and on the insulation package code requires at re-roof.

This page anchors national pricing. Pick your state below, then your city, for a local range.

Flat roofs price by the square foot more directly than pitched roofs — but six inputs still separate the low bids from the high ones.

  • Membrane type

    Modified bitumen and EPDM anchor the entry level; TPO sits mid-band; PVC with heat-welded seams tops the single-ply range. Thickness (45 vs 60 vs 80 mil) moves price within each.

  • Insulation package

    Code requires a minimum R-value at re-roof in most jurisdictions. Polyiso board runs $1,000–$4,000 on a typical residential flat roof and is the most common surprise line.

  • Drainage and taper

    Ponding water kills membranes. Tapered insulation, crickets, added drains, or scuppers fix slope problems — and add real cost when the existing deck is dead flat.

  • Penetrations and details

    HVAC curbs, skylights, vents, and parapet walls each need flashing details. A cluttered roof costs meaningfully more per square foot than a clean field.

  • Tear-off vs overlay

    Some codes allow one recover over an existing roof, saving tear-off and disposal. Wet insulation found by moisture scan forces full removal.

  • Access and building type

    A walk-out second-story deck roofs cheaply; a tight urban rowhouse with crane staging does not. Access drives labor and equipment lines.

Coverage

Flat Roof cost by state

Q&A

Flat Roof cost questions

TPO or EPDM?

EPDM handles cold climates well and has the longest track record; TPO's white surface trims cooling loads in warm climates. Installer experience with the membrane usually matters more than the membrane itself.

How long does a flat membrane last?

EPDM typically serves 20–30 years, TPO 15–25, PVC 20–30. Drainage and installation quality move those numbers more than brand.

What about ponding water?

Standing water past 48 hours accelerates wear and can void warranties. Fixing it usually means tapered insulation or added drains during the re-roof.

Can the new membrane go over the old roof?

Many codes allow a single recover if the existing roof is dry and sound — a moisture scan settles it. Wet insulation or a previous recover forces full tear-off, which adds removal and disposal lines.

Why does the insulation line cost so much?

Re-roofing triggers current energy code in most jurisdictions, which sets a minimum R-value. Meeting it usually means new polyiso board across the whole field — a code requirement, not an upsell.

Does a flat roof need more maintenance?

It needs different maintenance: keeping drains clear, checking seams and flashings annually, and addressing ponding early. A maintained membrane reaches its full service life; a neglected one fails at the details first.

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Price your roof today.

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(855) 000-0000

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Call (855) 000-0000