Gutter repair cost calculator
Add up the fixes: reseal joints, rehang sagging runs, patch a downspout. Enter your own prices and a contingency. Get the total.
Calculator
Resealing joints, rehanging a sagging run and fixing a downspout comes to about $236.50 with 10% contingency. Enter the prices from your own quotes.
Most gutter repairs are small, itemized fixes: reseal a leaking joint, rehang a sagging run, reattach a downspout. This tool sums those line items and adds a contingency for the surprise you find once the ladder is up. Every price is yours — nothing is hardcoded, so the estimate holds in any market.
The pattern: (reseal + rehang + downspout fix − discount) × (1 + contingency). Keep repairs separate from a full replacement — when the fixes start stacking up, price a new run and compare.
Formula
total = (reseal_joints × reseal_price + rehang_lf × rehang_price + downspout_fix − discount) × (1 + contingency)
- reseal_joints × reseal_price — sealing leaking seams and end caps, per joint.
- rehang_lf × rehang_price — refastening a sagging section with new hidden hangers, per foot.
- downspout_fix — reattaching or replacing a downspout, elbow or strap.
- discount — any credit; subtracted before the contingency.
- contingency — a decimal buffer (0.10 = 10%) for the unexpected.
Worked example
Reseal 5 joints at $15.00, rehang 20 feet at $4.00 a foot, fix one downspout for $60.00, no discount, 10% contingency:
(5 × $15.00 + 20 × $4.00 + $60.00) × 1.10
= ($75.00 + $80.00 + $60.00) × 1.10 = $215.00 × 1.10 = $236.50
The contingency adds $21.50 — cheap insurance against the rusted-through section you only see up close.
Repair or replace? Where the line is
Fix it when the damage is local. A leaking joint, one sagging run, a knocked-loose downspout — these are cheap, targeted repairs that buy years.
Replace it when the damage is systemic:
- Rust, pinholes or splits along multiple sections (aluminum rarely rusts; steel does).
- Sagging in several places — the fascia behind may be rotten, and no hanger holds in soft wood.
- Joints that keep reopening — sectional gutter leaks at the seams, and resealing is a losing game.
- Peeling paint or streaks on the siding below, meaning water has been overflowing for a while.
When repairs would run more than a third of a new run, price the replacement and the installed cost instead. Seamless aluminum removes the mid-run joints that leak in the first place. This is a planning estimate from your prices, not a bid — get itemized quotes from licensed, insured contractors, and check the fascia condition before you rehang anything.
Reference table
Common repair line items (you price each one — no rates are baked in):
| Repair | What it covers |
|---|---|
| Reseal a joint | Seam sealant on a leaking seam or end cap, per joint |
| Rehang a sagging run | New hidden hangers on a pulled-loose section, per foot |
| Replace a section | Swap a rusted or split length — sectional gutter only |
| Fix a downspout | Reattach or replace a downspout, elbow or strap |
When several rows apply at once, price a full replacement and compare.