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Flat Roofing Replacement Cost Calculator | Calculate Cost Before You Call a Contractor

Flat roof systems are commonly used in commercial buildings, multi-family housing, and modern residential architecture. Choosing the right system—TPO, EPDM, or PVC—and budgeting for labor, materials, and slope design are essential for project success. Our Flat Roofing replacement Cost Calculator gives contractors, property owners, and architects an accurate estimate based on national pricing benchmarks and regional labor data.

Key Cost Inputs for Flat Roof replacement

1. Roof Area & Project Type

Start by entering the total square footage of your flat roof.
Choose project type:
- Commercial roof replacement
- Multi-family housing
- Modern residential flat roof
Steeper parapet walls, mechanical units, or multi-level designs can affect access and prep work.

2. Roofing System Selection

Input the roof membrane type:
- TPO (Thermoplastic Polyolefin)
- EPDM (Ethylene Propylene Diene Monomer)
- PVC (Polyvinyl Chloride)
Enter cost per square foot for each material
Include thickness in mil, replacement method (mechanically fastened, fully adhered), and surface prep (tear-off, insulation).

3. Labor, Flashing & Drainage

Input:
- Labor rate per hour (varies by state and roof complexity)
- Estimated install time per 100 sq ft
- Flashing and seam welding costs (PVC & TPO require heat welding)
Add optional drainage systems:

Scuppers, crickets, internal drains, or perimeter gutters

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Flat Roof Repair Cost Calculator

ZIP Code (for regional labor adjust): Damage Area (sq ft): Type of Repair: Material Type: Wet Insulation Removal & Replace Flashing / Edge Repair Add‑On Cool Roof Coating After Repair Wildfire‑Rated Material Add Drainage Repair (scuppers, outlets) Structural Inspection Fee ($200) Emergency Response (after-hours) +25% Access Level (Complexity): Permit Fee (if any): Contingency (%):

How To Calculate Flat Roof replacement Cost By Calculator Step by Step Guide

Step 1: Define Scope of Work

Enter:
- Roof size in square feet
- Building type and roof complexity
- Existing roof tear-off requirements or overlays

Step 2: Select Roofing System and Material Factors

Choose your membrane:
- TPO: cost-effective, heat-welded seams, white reflective surface
- EPDM: flexible, good in cold climates, black color
- PVC: high chemical resistance, longer lifespan, premium cost
Input:
- Material cost per sq ft
- replacement method and thickness
- Include insulation or tapered design if applicable

Step 3: Input Labor & replacement Extras

Enter:
- Labor rate per hour
- Time estimate per 100 sq ft
- Optional extras: crane rental, edge flashing, vents or skylight curbs

The calculator will display:

Total replacement cost (material + labor + accessories)
Cost per sq ft installed
System comparison if selecting multiple options (TPO vs EPDM vs PVC)

Once you have a complete estimate, you can use it to plan your next steps—or let our professionals handle the full scope of your flat roof replacement with expert care.

Why Use a Flat Roof replacement Cost Calculator?

Compare roofing systems side-by-side for cost and performance
Plan budget ranges for flat roof replacement or new construction
Meet warranty specs by selecting correct thickness and attachment
Prevent cost overruns by including flashing, access, and slope-related labor

Whether you’re bidding on a commercial flat roof project or building a modern home in a hot climate, our Flat Roofing replacement Cost Calculator is a contract-grade estimator that supports smart planning and specification.

Updated with 2026 national membrane pricing and regional wage data.