Scope and cost guide
Low-slope membrane roof cost
Start with a published planning range and worked example, then check its date, geography, unit, inclusions, and limits before comparing a DFW quote.
Compare against a real roofCost at a glance
Published planning numbers with visible assumptions
Cost item
TPO membrane roof
- Published amount
- $4–$10 per sq. ft. installed
- Worked scale
- 1,000 sq. ft. = $4,000–$10,000
- What the number covers
- Membrane, thickness, attachment, and assembly layers still need names
Cost item
PVC membrane roof
- Published amount
- $5–$12 per sq. ft. installed
- Worked scale
- 1,000 sq. ft. = $5,000–$12,000
- What the number covers
- Formulation and exposure compatibility matter
Cost item
Modified-bitumen roof
- Published amount
- $4–$7.50 per sq. ft. installed
- Worked scale
- 1,000 sq. ft. = $4,000–$7,500
- What the number covers
- Application method and occupied-space controls can differ
Cost item
Existing flat-roof removal
- Published amount
- $1–$2 per sq. ft.
- Worked scale
- 1,000 sq. ft. = $1,000–$2,000
- What the number covers
- Published removal component; wet insulation and deck work are extra unknowns
Published planning range
Data basis: HomeGuide flat-roof consumer cost data retrieved August 31, 2026; national installed bands, not a DFW assembly quote.
Worked example
For a 1,000-square-foot TPO planning case, the installed band is $4,000–$10,000. If full removal applies, $4,000 + $1,000 = $5,000 at the low end and $10,000 + $2,000 = $12,000 at the high end before moisture investigation, insulation changes, tapered drainage, curbs, edge metal, or warranty inspection.
What that price includes
A comparable bid describes every layer from deck to surface: investigation, removal, vapor or air control, insulation, taper, cover board, attachment, membrane and thickness, seams, drains, scuppers, penetrations, curbs, perimeter metal, access, and inspection.
What moves the number
A small open garage deck with sound drainage differs from an occupied addition with wet insulation, many penetrations, ponding correction, difficult staging, custom curbs, parapets, or a manufacturer-inspected warranty path.
Costs that must stay separate
Do not compare membrane color or price alone. Structural deck repair, interior protection, crane or lift service, drainage redesign, electrical equipment, and hazardous-material handling require their own scope.
What a DFW quote must show
- Existing roof and deck: State how moisture, layers, attachment, structural condition, and any test cuts or investigation will be handled.
- Complete assembly: Name vapor or air control, insulation, taper, cover board, membrane, reinforcement, attachment, and surface finish.
- Drainage and penetrations: Price drains, scuppers, overflow, curbs, pipes, equipment, crickets, and transitions as designed details.
- Edges and fastening: Specify perimeter metal, termination, field and perimeter attachment, seam work, and wind-related design responsibility.
Match every layer from deck to surface: removal, vapor or air control, insulation, taper, cover board, attachment, membrane, seams, drains, scuppers, curbs, penetrations, edge metal, access, inspection, and warranty.
Request a measured DFW estimate to replace the low-slope membrane roof cost planning range with current supplier, crew, public-fee, and property-specific numbers.
Common questions
Answers to check before you decide
What should I budget for low-slope membrane roof cost?
Published national installed ranges for residential low-slope roofing are about $4–$10 per square foot for TPO, $5–$12 for PVC, and $4–$7.50 for [modified bitumen](/roofing-glossary#modified-bitumen). A 1,000-square-foot section therefore spans roughly $4,000–$12,000 before confirming insulation, drainage, penetrations, edges, or hidden moisture.
Which inputs should competing proposals match?
Begin with tpo membrane roof, pvc membrane roof, modified-bitumen roof, existing flat-roof removal, then compare removal, protection, access, public requirements, disposal, optional work, and closeout.
How should hidden work be priced?
Use a documented unit price, allowance, investigation step, or homeowner approval path. Final quantities and photographs should support the change.
Keep reading
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