Commercial Roof Replacement Cost in NJ — By System & Size
The table below reflects Central NJ market pricing for complete commercial roof replacement, including tear-off and disposal of existing membrane, new insulation board (2" polyiso), membrane installation, flashing, and drains. Prices exclude permits and engineering, which typically add $500–$2,500 depending on project scope. Call (732) 503-8133 for a project-specific estimate.
| Roof Size | TPO Membrane | EPDM Rubber | Modified Bitumen | Metal (Standing Seam) |
|---|---|---|---|---|
| 2,000 sq ft | $12,000–$18,000 | $10,000–$16,000 | $10,000–$16,000 | $20,000–$36,000 |
| 3,500 sq ft | $21,000–$31,500 | $17,500–$28,000 | $17,500–$28,000 | $35,000–$63,000 |
| 5,000 sq ft | $30,000–$45,000 | $25,000–$40,000 | $25,000–$40,000 | $50,000–$90,000 |
| 7,500 sq ft | $45,000–$67,500 | $37,500–$60,000 | $37,500–$60,000 | $75,000–$135,000 |
| 10,000 sq ft | $60,000–$90,000 | $50,000–$80,000 | $50,000–$80,000 | $100,000–$180,000 |
All prices reflect installed cost in Central NJ (Mercer, Middlesex, Monmouth, Somerset Counties) as of 2026. Prices assume accessible single-story commercial structure. Multi-story, complex drain configurations, and significant structural repairs are quoted separately.
What Drives Commercial Roofing Cost in NJ
Several variables determine the final cost of a commercial roof replacement beyond the square footage and system type:
Existing roof condition. If the existing membrane has failed into the insulation or deck, a complete tear-off and deck replacement adds significant cost. A membrane in deteriorated but structurally sound condition that can be removed without deck damage stays within the base price ranges above.
Insulation R-value. NJ commercial building code requires minimum R-25 for new commercial roofs (IECC 2021). Bringing an older building up to code insulation requirements adds $1–$3/sq ft depending on current substrate conditions.
Rooftop penetrations and equipment. Every HVAC unit, exhaust duct, pipe penetration, and skylight requires custom flashing. Roofs with heavy mechanical equipment payloads may also require structural engineering review before installation.
Access and logistics. Multi-story buildings, tight urban lots, or properties requiring crane access for material delivery add to project cost. Best Crew provides accurate access assessments during the initial site visit.