Flat Roofing Contractors costs
Compare the project, repair and planning references below before choosing the work for your property. Confirm measurements, existing conditions and the services included in each proposal.
Cost scope: Benchmarks were reviewed October 24, 2026. Figures apply to the scope and market named by each reference. City/state examples outside Portland Metro are not Portland quotes. Labor, equipment, recurring expenses and complete projects are different budgets.
Installation and project costs
Compare alternatives separately. A range includes installation only when its scope says so. Do not add overlapping totals together.
| Project or reference | Published benchmark | Basis and scope |
|---|---|---|
| Modified bitumen roof cost | $4,900 – $14,600 | total cost to replace |
| Flat roof replacement cost | $3 – $11 | cost per square foot installed |
| Flat roof replacement cost | $4,000 – $16,800 | total cost to replace |
| TPO roofing cost | $4 – $10 | cost per square foot installed |
| TPO roofing cost | $7,700 – $14,000 | total cost installed |
| Torch down roofing cost | $4,400 – $15,000 | total cost to replace |
| Tar and gravel roof cost | $4,500 – $12,600 | total cost to install |
Related RemodelRates cost guides
- Modified bitumen roof cost
- Flat roof replacement cost
- TPO roofing cost
- Torch down roofing cost
- Tar and gravel roof cost
Explore the related RemodelRates guides for project benchmarks and planning details.
Before requesting bids
Share measurements, photos, location, existing conditions and the desired result. Ask for a written scope covering preparation, permits, removal, material specifications, installation, disposal and finish repairs where relevant. Compare bids using the same quantities and exclusions.
Material cost
No separate material-only purchase range was verified for this collection. Ask for an itemized allowance with quantities, product specifications and delivery; do not infer it by subtracting unrelated ranges.