When it comes to roofing in New Jersey, flat roofs are a popular choice for commercial buildings and some residential properties. But how much does it really cost to install or replace one in 2025?
🏷️ Average Flat Roof Cost per Square Foot
TPO (Thermoplastic Polyolefin): $7 – $12 per sq. ft.
EPDM (Rubber Membrane): $6 – $10 per sq. ft.
Modified Bitumen / Torch-Down: $5 – $9 per sq. ft.
This includes material and labor, but prices can increase if the roof needs insulation, tear-off, or complex drainage work.
💼 Flat Roof Installation: What Affects the Price?
Roof Size & Layers to Remove: Removing old material costs $1–$3/sq. ft.
Insulation Thickness: Code requirements vary; insulation can add $2–$4/sq. ft.
Flashing & Drainage Work: Custom work around parapet walls or scuppers can drive up costs.
📍 Local Costs in New Jersey
For a 2,000 sq. ft. commercial flat roof:
TPO System: ~$16,000 – $24,000
Torch-Down: ~$12,000 – $18,000
EPDM Rubber: ~$14,000 – $20,000
These prices vary based on city codes, roof condition, and weatherproofing requirements.
👷♂️ Tip: Get a Roof Inspection First
Before starting any flat roofing project, have a licensed contractor perform an inspection. This helps detect issues like:
Ponding water
Damaged insulation
Leaks around mechanical curbs or skylights
