Replacing a flat roof averages $7,433 nationally (Angi/HomeAdvisor), with a separate $8,000 average from Fixr scoped to a 1,000–1,500 square-foot roof in modified bitumen.1,2,3 Angi (2026 data, from 32,999 verified projects) reports most homeowners paying $3,331 – $11,558, and HomeAdvisor (2025 data) publishes the identical span as its average range, working out to $4 – $35 per square foot – the two are corporate siblings, and matching figures alone don’t establish independent corroboration.1,2 Fixr (updated January 2026) reports a national range of $4,000 – $21,000, climbing to $42,000 or more for a 3,000-square-foot roof in a premium material like TPO.3 Prices below are national averages*.
*National averages, not local quotes. Your price depends on roof size, material, removal needs, permits, and local labor rates.
A note on safety. Roof work carries serious fall risk: falls are the leading cause of death in construction work – 389 fatal falls out of 1,034 construction fatalities in 2024, according to OSHA (BLS data). The prices below reflect professional installation.4
$7,433
average cost (Angi/HomeAdvisor)
$8,000
average – 1,000–1,500 sq ft, modified bitumen (Fixr)
$3,331–$11,558
most homeowners pay (Angi); average range (HomeAdvisor)
$4–$14
per sq ft installed (Fixr)
What the sources say
| Source | Headline figures | Notes |
|---|---|---|
| Angi (2026 data, updated Oct 2026) | $7,433 average from 32,999 verified projects; most homeowners pay $3,331 – $11,558; labor $3 – $7 per sq ft; removal $1 – $5 per sq ft | Corporate sibling of HomeAdvisor; identical headline figures |
| HomeAdvisor (2025 data, updated Jun 2026) | Identical $7,433 average and $3,331 – $11,558 average range (stated as $4 – $35 per sq ft); labor averages 20% – 30% of the total bill | Sibling-identical figures; matching figures alone don’t establish independent corroboration |
| Fixr (updated Jan 2026) | $8,000 average scoped to a 1,000–1,500 sq ft modified-bitumen roof; range $4,000 – $21,000; up to $42,000+ for 3,000 sq ft in TPO; $4 – $14 per sq ft installed | Average carries a defined project scope; separately published, pages state no shared sourcing |
Angi and HomeAdvisor share identical figures throughout this guide – sibling-published data, noted once here. Fixr’s figures are separately published, and the pages state no shared sourcing; where all three publish the same numbers, that is noted with the table.
Cost by roof size
All three publishers list identical cost ranges by roof size for the sizes below. Angi and HomeAdvisor are corporate siblings; Fixr’s matching figures are separately published, and the pages state no shared sourcing.1,2,3
| Roof size (sq ft) | Typical cost range (all three sources) |
|---|---|
| 1,000 | $4,000 – $14,000 |
| 1,500 | $6,000 – $21,000 |
| 1,700 (Fixr only) | $6,800 – $23,800 |
| 2,000 | $8,000 – $28,000 |
| 2,500 | $10,000 – $35,000 |
| 3,000 | $12,000 – $42,000 |
These ranges work out to roughly $4 – $14 per square foot, which matches each publisher’s stated per-square-foot average for standard materials.
Cost by roofing material
Per-square-foot material costs (materials and installation) as published by each source. Angi lists rubber and EPDM as separate rows; HomeAdvisor and Fixr treat them as one material. Angi also lists fiberglass and GRP separately; the others combine them.1,2,3
| Material | Angi (2026) | HomeAdvisor (2025) | Fixr (2026) |
|---|---|---|---|
| Fiberglass | $4 – $6 | $4 – $6 (fiberglass/GRP) | $4 – $6 (fiberglass/GRP) |
| GRP | $4 – $6 | merged with fiberglass | merged with fiberglass |
| Modified bitumen | $4 – $8 | $4 – $8 | $4 – $8 |
| Built-up (tar / BUR) | $4 – $10 | $4 – $10 | $4 – $10 |
| Rubber | $4 – $13 | $4 – $13 (rubber/EPDM) | – |
| EPDM | $5 – $13 | merged with rubber | $4 – $13 |
| TPO | $4 – $14 | $4 – $14 | $4 – $14 |
| Concrete | – | – | $4 – $9 |
| Metal | – | – | $4 – $30 |
| PVC | – | – | $5 – $16 |
| Green | – | – | $10 – $30 |
HomeAdvisor also publishes per-material averages: fiberglass $5 per sq ft (about $500 per roofing square), modified bitumen $6, built-up tar $7, and TPO $8.75.2
Matching ranges between Angi/HomeAdvisor and Fixr on shared materials are separately published figures, and the pages state no shared sourcing.
Cost by flat roof type (Angi/HomeAdvisor)
Angi and HomeAdvisor publish identical per-square-foot ranges by roof design – sibling-published figures:1,2
| Roof type | Cost per sq ft (Angi/HomeAdvisor) |
|---|---|
| Cold | $4 – $9 |
| Warm | $6 – $11 |
| Inverted | $4 – $9 |
| Hybrid (“Hybrid/compact” at HomeAdvisor) | $4 – $11 |
| Curved | $8 – $15 |
| Tapered | $7 – $10 |
| Green | $10 – $35 |
Fixr describes four of these designs (warm, cold, hybrid, and inverted) without pricing them. Note that the green-roof row above prices a roof type; Fixr’s $10 – $30 green figure in the material table is a separate per-material estimate.3
Cost by installation method (Angi)
Angi prices the three attachment methods per square foot: ballasted at $1.50 – $2, fastened at $2 – $3, and fully adhered at $2.75 – $3.50.1
Fixr describes the same three methods without prices but ranks them differently, calling ballasted the most affordable, fully adhered the middle option, and fastened usually the most expensive. Angi’s prices place fully adhered above fastened. The sources do not reconcile the difference.3
Labor, removal, and permits
All three publishers put flat roof labor at $3 – $7 per square foot (Angi/HomeAdvisor sibling-published; Fixr separately published, pages state no shared sourcing). Fixr adds hourly rates of $30 – $130, averaging about $75. HomeAdvisor puts labor at roughly 20% – 30% of the total bill; Angi reports the same 20% – 30% as a markup when contractors quote on total project cost. Fixr reports labor ranging from around 20% up to nearly half the total, depending on the material.1,2,3
Old roof removal and disposal runs $1 – $5 per square foot at all three sources. Angi and HomeAdvisor put the average removal total at $1,000 – $1,500; Fixr reports $1,000 – $5,000 for an average-sized roof. The sources do not explain the difference.1,2,3
Permits cost $250 – $600 at Angi and HomeAdvisor; Fixr reports $150 – $600. Angi also lists final inspections as a budget item without pricing them.1,2,3
Repair vs. replacement pricing
Angi and HomeAdvisor put minor flat roof repairs at an average of $400 (sibling-published figures). Fixr reports a $700 repair average against its $8,000 replacement average. The publishers price repairs differently; the figures are shown as published. For more, see our roof repair cost guide.1,2,3
Frequently asked questions
How much does it cost to replace a flat roof?
Angi and HomeAdvisor report an identical $7,433 average, with Angi’s most-homeowners span at $3,331 – $11,558 (sibling-published figures). Fixr reports an $8,000 average for a 1,000–1,500 sq ft modified-bitumen roof, within a $4,000 – $21,000 range.1,2,3
How much does flat roof replacement cost per square foot?
Fixr reports $4 – $14 per square foot installed for standard materials. HomeAdvisor’s full span is $4 – $35 per square foot when premium designs like green roofs are included. Labor alone runs $3 – $7 per square foot at all three sources.1,2,3
How much does it cost to remove an old flat roof?
All three sources report $1 – $5 per square foot for removal and disposal. Angi and HomeAdvisor average $1,000 – $1,500 total; Fixr reports $1,000 – $5,000 for an average-sized roof.1,2,3
How much does flat roof repair cost?
Angi and HomeAdvisor report a $400 average for minor repairs (sibling-published figures); Fixr reports a $700 average. The sources do not explain the difference.1,2,3
Related guides
Rubber Roof Cost
Green Roof Cost
Roof Replacement Cost
Roof Repair Cost
Metal Roof Cost
Tile Roof Cost
All cost guides
Sources
1. Angi — How Much Does Flat Roof Replacement Cost? (2026 data)
2. HomeAdvisor — How Much Does It Cost to Replace a Flat Roof? (2025 data)
3. Fixr — How Much Does Flat Roof Replacement Cost? (updated Jan 2026)
4. OSHA — Fall Prevention Campaign