Skip to content
Need a Renovation Cost Estimate?

How Much Does Flat Roof Repair Cost?

Get your renovation costs using Renotag's renovation cost calculator:

Key Takeaways

Key PointDetails
Cost Per Square Foot Installed$2.50 – $10.00
Average Cost to Repair$300 – $1,100
National Average Repair Cost$900
Minimum and Maximum Repair Cost$100 – $5,000
Common Flat Roof IssuesLeaks, blistering, sagging, damage from weather

Flat Roof Repair Cost

Flat roofs, while sleek and modern, do require periodic maintenance and repairs to keep them functional and safe. Repair costs can vary based on factors such as the extent of the damage, the size of the roof, and the specific materials used.

Average Flat Roof Repair Cost

National Average Cost$900
Minimum Cost$100
Maximum Cost$5,000
Average Range$300 to $1,100

Flat Roof Repair Cost Estimate By Type

Costs for repairing a flat roof can vary significantly depending on the nature of the repair:

RepairAverage Cost
Leak Repair$500 – $1,200
Coat / Reseal / Recover$500 – $2,000
Tear Off and Full Replacement$4,000 – $16,800

Flat Roof Leak Repair Cost

Leaks are one of the most common issues with flat roofs. The cost of repairing leaks can depend on the size and severity of the leak.

Leak SizeAverage CostRepairs
Small$150 – $500– Sealant applied to small cracks or loose roofing
– No water-damaged roofing
Average$500 – $1,200– Multiple leaks
– Membrane replacements and sealing
– Multiple roofer visits
Large$1,200 – $3,000– Multiple leaks with extensive damage
– Repairing water-damaged rafters and roofing
– Multiple roofer visits

Cost To Coat Or Reseal A Flat Roof

Sealing or coating a flat roof is an effective way to extend its lifespan and protect it from the elements.

Roof Size (Square Foot)Average Cost
100$100 – $400
250$250 – $1,000
500$500 – $2,000
1,000$1,000 – $4,000

Flat Roof Replacement Cost

In some cases, replacing the flat roof entirely may be necessary. Here’s what you can expect for replacement costs based on roof size.

Roof Size (Square Feet)Average Cost to Replace
800$2,400 – $8,800
1,000$3,000 – $11,000
1,500$4,500 – $16,500
2,000$6,000 – $22,000
2,500$7,500 – $27,500
3,000$9,000 – $33,000
3,500$10,500 – $38,500

Additional Costs To Repair A Flat Roof

Additional repair costs can arise depending on specific issues and necessary fixes.

FactorAverage Cost
Blistering, Cracking, Alligatoring Repair$250 – $1,250
Sagging / Water Pooling Repair$800 – $2,500
Flashing Repair$200 – $500
Rafter Repair$300 – $1,700+
Roof Decking Repair$200 – $2,500
Water Damage / Structural Repair$500 – $3,000
Cleaning$250 – $600
Insulation$1,100 – $9,000
Snow Removal$200 – $500
Drip Edge Installation$150 – $600
Roof Vents Installation$200 – $700
Painting (Metal)$1,450 – $3,250
New Gutters$600 – $1,600
Roof Inspection$100 – $400
New Drain$70 – $340

Cost To Repair A Flat Roof By Material

Different roofing materials come with different repair costs. Here’s a breakdown:

MaterialRepair Cost per Square Foot
Built-up Roof$2 – $7
EPDM Rubber Membrane Roof$2 – $10
TPO Membrane Roof$2 – $9
PVC Membrane Roof$3 – $12
Fiberglass (GRP) Roof$3 – $8
Modified Bitumen Roof$3 – $8
Rolled Asphalt Roof$1 – $6
Spray Foam Roof$2 – $3
Metal Roof$5 – $10
Concrete Roof$4 – $15

Labor Cost To Repair A Flat Roof

Labor costs are a significant part of the overall repair cost. These costs can vary based on the complexity of the job, the size of the roof, and the local labor rates. Typically, labor costs range from $70 to $100 per hour.

Frequently Asked Questions

How Often Should A Flat Roof Be Replaced?

Flat roofs have a shorter lifespan compared to sloped roofs. On average, they should be replaced every 15-25 years. However, proper maintenance and timely repairs can extend their life.

How Often Should A Flat Roof Be Inspected?

It’s wise to inspect flat roofs at least twice a year, usually in the spring and fall. Regular inspections can help identify potential problems early and prevent costly repairs.

Why Do Flat Roofs Leak?

Flat roofs may leak due to various reasons such as poor installation, weather-related damage, aging materials, ponding water, and lack of proper maintenance. Flat roofs do not have the slope to naturally shed water, which can create pooling and lead to leaks over time.

Are Flat Roof Repairs Covered By Insurance?

Most homeowner insurance policies cover roof damage caused by events such as storms, falling trees, or fire. However, they usually do not cover damage due to wear and tear or lack of maintenance. It’s always best to review the terms of your insurance policy or consult with your insurance provider.

Getting Estimates From Roof Repair Contractors

When planning a flat roof repair, obtaining multiple estimates from qualified contractors can help you understand the scope of the work and ensure you get a fair price.

Questions To Ask

  • How long have you been in the roofing business?
  • Can you provide references from recent clients?
  • Are you licensed and insured?
  • Do you offer a warranty for your work?
  • What is your estimated timeline for the project?
  • What materials do you recommend and why?

By carefully considering the above factors and asking the right questions, you can make an informed decision and ensure your flat roof remains in excellent condition.

Renotag's renovation cost calculator being used by a person to price their home renovation costs.
social proofs renotag
5K+ homeowners trust Renotag

Your renovation cost is waiting

The world's first renovation cost calculator.

Table of Contents

Calculate your reno price

Add your project details, choose your finishes, and get a price for your project – no contractor needed until construction time.