How much does it cost to fix a chimney flashing?

DIY materials typically run about $26. Hiring a pro usually costs $300-$800 depending on your area and the scope of the job.

What are common mistakes when you fix a chimney flashing?

Common DIY mistakes include: Insufficient Sealant; Incorrect Flashing Installation; Ignoring Surrounding Damage. See RepairSmart for the full list and cost breakdown.

What safety hazards should I watch for when working on chimney flashing?

Key hazards include: Fall from height; Structural instability; Tool and technique injury risk. See RepairSmart for stop-conditions and the full safety list.

Chimney Flashing Repair

Chimney Flashing Repair is a common exterior job. Homeowners typically spend about $26 on materials if they tackle it themselves, while hiring a professional usually runs $300–$800 depending on access, parts, and local labor rates. DIY can save up to about $774 versus a full pro job when the work stays straightforward.

Expect roughly 2-4 hours for a careful DIY attempt versus about 1-2 hours for a seasoned pro. Difficulty is rated 4/5 (advanced) with high risk. Typical materials include step flashing, roofing sealant, roofing nails. Common tools: pry bar, hammer, tin snips, ladder.

RepairSmart does not publish step-by-step DIY instructions for this job. This is classified as high-risk work. RepairSmart does not provide DIY instructions for this job; hire a qualified professional. Use the cost breakdown below to budget a professional visit.

Typical Cost

DIY materials ~$26

Hire a pro $300–$800

Potential savings up to $774

Cost estimates based on cataloged material prices and regional pro rates. Run the analysis for US-wide retailer prices and a regional professional-cost estimate. How we estimate costs.

Is this a DIY job?

AI-assisted educational guidance — not reviewed by a licensed professional. Review policy.

Difficulty 4/5

high risk

Typical DIY time2-4 hours
Typical pro time1-2 hours
Permit requiredNo

What affects the cost

Local labor rates for exterior pros and whether the visit is emergency vs. scheduled.
Brand and quality of parts (step flashing, roofing sealant, roofing nails) versus economy alternatives.
Specialty tools, insurance requirements, and limited DIY alternatives.
Tool rental or purchase (catalog estimate about $5 for specialized tools).
Access difficulty (tight spaces, multi-story work, finished surfaces that must be protected or repaired after the job).

When to hire a pro

This is classified as high-risk work. RepairSmart does not provide DIY instructions for this job; hire a qualified professional.
Risk level is high—mistakes can cause serious injury or expensive damage. Prefer a qualified professional unless you have trade-specific training.
If the roof is steep, icy/wet, or you lack proper fall protection and a stable ladder setup, hire a pro — do not work alone at height.
If members are rotten, crushed, or deflecting under load, stop and consult a structural pro or engineer before continuing.
If you lack the right tools, PPE, or confidence in the next step, pause and get help rather than force it.
High-impact DIY mistake — Incorrect Flashing Installation: Follow the manufacturer's instructions for installation and ensure the flashing is securely fastened.
High-impact DIY mistake — Inadequate Safety Precautions: Wear a harness and secure your ladder to the chimney, and ensure the area is clear of debris.
When hiring a professional to repair your chimney flashing, be sure to provide them with detailed information about the damage and the materials needed for the repair. Ask for a detailed quote that includes the cost of materials and labor.

Compare DIY vs. hire for your ZIP →

Hazards & safety alerts

high fall Fall from height

Chimney Flashing Repair often requires ladder or roof work. Wet surfaces, steep pitch, and wind greatly increase fall risk and serious injury.

Stop and call a pro if: If the roof is steep, icy/wet, or you lack proper fall protection and a stable ladder setup, hire a pro — do not work alone at height.
high structural Structural instability

Improper repairs on chimney flashing repair can weaken load paths. Soft, cracked, or moving framing can lead to collapse or progressive damage.

Stop and call a pro if: If members are rotten, crushed, or deflecting under load, stop and consult a structural pro or engineer before continuing.
medium injury Tool and technique injury risk

Rushing, skipping eye or hand protection, or using damaged tools can turn a routine repair into a trip to urgent care.

Stop and call a pro if: If you lack the right tools, PPE, or confidence in the next step, pause and get help rather than force it.

Enter your ZIP for a personalized DIY vs. hire analysis →

Materials you'll need

Material	Est. Price
step flashing	$15.00
roofing sealant	$8.00
roofing nails	$3.00
Total (DIY materials)	$26.00

Tools: pry bar, hammer, tin snips, ladder

Detailed DIY guidance unavailable

⚠This is classified as high-risk work. RepairSmart does not provide DIY instructions for this job; hire a qualified professional.

Common DIY mistakes

medium Insufficient Sealant

Using too little roofing sealant can lead to leaks and water damage.
high Incorrect Flashing Installation

Improperly installed flashing can lead to gaps and weaknesses in the seal.
medium Ignoring Surrounding Damage

Failing to inspect and repair surrounding damage can lead to further water damage and leaks.
high Inadequate Safety Precautions

Failing to take proper safety precautions can lead to injury or accidents.
low Using Incorrect Materials

Using the wrong materials can lead to a poor seal and further damage.