Flat Roof Replacement Cost Calculator
2026 U.S. low-slope / flat roof replacement planning ranges scale with roof area and membrane (EPDM, TPO, modified bitumen). Insulation wetness, parapet details, and drain work often widen bids beyond the membrane tier. Distinct from steep-slope asphalt models in the roof replacement calculator. TPO, EPDM, modified bitumen, or similar low-slope membrane replacement. Modeled ranges assume a typical residential or small accessory-building footprint.
Estimated flat roof replacement cost cost
Enter your project details and calculate to see a planning estimate.
This is a planning estimate, not a contractor quote. Actual costs vary by location, home condition, material availability, permits, and project complexity.
Planning rates for cost year 2026 (national baselines × state regional factors). Not a contractor quote.
National planning ranges
| Item | Low | Typical | High |
|---|---|---|---|
| Flat Roof Replacement (national planning range)per project | $6,000 | $12,000 | $22,000 |
About this project
TPO, EPDM, modified bitumen, or similar low-slope membrane replacement. Modeled ranges assume a typical residential or small accessory-building footprint.
Browse more in Roofing.
Related resources
- Category hub
- Roof Replacement
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- Gutter Repair
- Flat Roof Replacement calculator
- Roof Replacement calculator
- Roof Coating calculator
- Roof Repair calculator
- Roof Repair vs Replacement
- Flat Roof Replacement cost guide
- Compare repair vs replace
- Common home problems
- Maintenance cost guides
- Home cost blog
- State cost factors
- National cost bands
Frequently asked questions
Methodology & estimate disclaimer
2026 U.S. low-slope / flat roof replacement planning ranges scale with roof area and membrane (EPDM, TPO, modified bitumen). Insulation wetness, parapet details, and drain work often widen bids beyond the membrane tier. Distinct from steep-slope asphalt models in the roof replacement calculator.
Actual costs vary by location, home condition, material availability, permits, and project complexity. Read our methodology, the national cost bands table, editorial policy, and disclaimer. Planning provenance uses internal model notes (not invented third-party citations)—see the bands page for published low/typical/high frames.
Planning sources
- Home Cost Atlas national planning model v1 — Modeled national planning ranges used for cost guides and seed CostRecords. Values are planning estimates synthesized for budgeting context, not observed contractor invoices or bid samples.
- Home Cost Atlas planning baselines v1 — Internal baseline spreads (low / typical / high) by project category. Intended for calculator scaffolds and aggregation fallbacks; not a dataset of paid jobs.
Cost year: 2026 rate book · Data version: hca-national-model-v1 · Last reviewed: July 24, 2026