Real 2026 pricing for EPDM, TPO, modified bitumen, and roof coating in New Jersey — fully installed with permit, tear-off, and materials. NJ Roofing has completed 1,000+ flat roofing projects across Essex, Bergen, Hudson, Union, and Morris counties.
NJ Roofing installs all three major commercial flat roofing systems. Here's what each costs fully installed in New Jersey in 2026, and which properties each is best suited for.
EPDM (ethylene propylene diene monomer) is the most widely used flat roofing system in New Jersey. It's a single-ply rubber membrane that offers excellent waterproofing and a 20–30 year lifespan at a lower cost than TPO or modified bitumen.
TPO (thermoplastic polyolefin) is a white, heat-reflective membrane that reduces cooling costs and is growing rapidly in NJ due to energy code requirements. Heat-welded seams make it extremely watertight.
Modified bitumen is a multi-layer asphalt-based system that provides excellent durability and foot traffic resistance. It's the traditional choice for commercial and industrial roofing throughout New Jersey.
Estimated total installed cost ranges for common NJ commercial and residential flat roof sizes in 2026. Includes tear-off, materials, labor, permit, and clean-up.
| Roof Size | EPDM | TPO | Mod Bitumen | Roof Coating | Best Fit |
|---|---|---|---|---|---|
| 500 sq ft Small addition / garage | $3,250–$4,750 | $3,750–$5,750 | $4,000–$7,000 | $1,750–$3,500 | Residential addition |
| 1,000 sq ft Porch or small flat | $6,500–$9,500 | $7,500–$11,500 | $8,000–$14,000 | $3,500–$7,000 | Residential / mixed |
| 2,500 sq ft Small commercial | $16,250–$23,750 | $18,750–$28,750 | $20,000–$35,000 | $8,750–$17,500 | Small commercial |
| 5,000 sq ft Mid-size commercial | $32,500–$47,500 | $37,500–$57,500 | $40,000–$70,000 | $17,500–$35,000 | Commercial building |
| 10,000 sq ft Large commercial | $65,000–$95,000 | $75,000–$115,000 | $80,000–$140,000 | $35,000–$70,000 | Warehouse / retail |
| 20,000+ sq ft Portfolio / industrial | Call for custom quote — 201-218-3666 | Quoted by scope | |||
All estimates include standard tear-off of one layer, standard insulation, NJ permit, and clean-up. Tapered insulation, deck repairs, or drain upgrades are quoted separately. Prices are 2026 NJ market rates.
Five variables that move the price on any NJ flat roofing project — knowing these helps you compare quotes accurately.
Larger roofs reduce the per-square-foot cost but increase total project price. Projects under 1,000 sq ft often carry a minimum mobilization charge.
Removing the existing roof adds $1.00–$2.50/sq ft. If there are two layers already, NJ code requires full tear-off before a new system is installed.
Tapered ISO insulation (required for proper drainage on flat roofs) adds $1.50–$3.50/sq ft. NJ energy codes may require R-30 or higher on commercial properties.
Ponding water indicates drainage problems. Scupper enlargement, drain relocation, or re-sloping adds cost but is often required to preserve the membrane warranty.
Occupied buildings, difficult roof access, parapet walls, and HVAC equipment around the work area all increase labor time and staging costs.
The right answer depends entirely on the condition of your existing roof deck and insulation. Here's how to think through it.
A silicone or acrylic coating applied over an existing flat roof that is structurally sound with no wet insulation. Can extend roof life 10–15 years at a fraction of replacement cost.
Good candidate if: less than 25% of the roof area has wet or damaged insulation, the existing membrane is still intact, and drainage is adequate.
Complete tear-off of the existing system and installation of a new membrane, insulation, and flashing. Required when the existing roof deck or insulation is saturated, damaged, or when the membrane has reached end of life.
Necessary when: core samples show wet insulation, the deck is soft or rotted, the existing membrane has extensive ponding or multiple failure points, or the roof is 20+ years old.
Common NJ flat roofing project sizes and what they typically cost fully installed in 2026.
Answers to the most common questions NJ property owners ask before getting a flat roofing quote.
Free on-site inspection and written estimate for any NJ flat roofing project — EPDM, TPO, modified bitumen, or roof coating. All permits handled. All NJ counties served.
