A complete walkthrough for installing gutters on your home. Covers sizing your gutters for your roof, establishing the right slope, hanging with brackets, connecting downspouts, and sealing joints. A straightforward weekend project that protects your home from thousands of dollars in water damage.
Difficulty
Intermediate
Time
1–2 days
Material Cost
$3–$8 per LF
| Gutter Size | Roof Drainage Area |
|---|---|
| 5" K-style | Up to 5,520 sq ft |
| 6" K-style | Up to 7,960 sq ft |
| 5" half-round | Up to 2,500 sq ft |
| 6" half-round | Up to 3,840 sq ft |
To calculate drainage area: multiply the eave length by the horizontal run from eave to ridge (not the slope length). For most single-story homes, 5" K-style gutters are sufficient. Calculate your exact requirements with our Gutter Calculator.
| Gutter Size | Downspout Size | Max Run per Downspout |
|---|---|---|
| 5" K-style | 2×3" rectangular | 35–40 ft |
| 6" K-style | 3×4" rectangular | 40–50 ft |
| 5" half-round | 3" round | 30–35 ft |
| 6" half-round | 4" round | 35–40 ft |
Rule of thumb: one downspout per 30–40 feet of gutter. Place downspouts at the low end of each gutter run. Corners and valleys should have downspouts nearby.
| Material | Est. Cost | |
|---|---|---|
| 5" K-style gutter sections (10 ft) | $35–$60 | |
| 2×3" downspout sections (10 ft) | $14–$24 | |
| Gutter hangers/brackets | $20–$40 | |
| Inside/outside corners | $5–$12 each | |
| End caps (left and right) | $3–$6 | |
| Drop outlet | $4–$8 | |
| Downspout elbows (A and B style) | $12–$24 | |
| Downspout brackets | $6–$12 | |
| Gutter sealant | $5–$8 | |
| Slip connectors | $6–$12 | |
| Splash block or extension | $5–$15 | |
| Gutter screws (hex head) | $8–$12 | |
| Total (50 LF) | $123–$233 |
Cordless drill/driver, tin snips or aviation snips (for cutting aluminum gutters), pop rivet gun and rivets, chalk line, tape measure, ladder (safely reaching the fascia), level or line level, hacksaw (for downspouts), caulk gun, gloves. Optional: gutter crimper for joining sections.
Walk around the house and decide where downspouts will go. Downspouts should discharge away from the foundation, ideally 4–6 ft from the house. Plan gutter runs to slope toward the nearest downspout. Gutters on long walls may need a high point in the center sloping to downspouts at both ends. Sketch your layout with measurements.
Gutters must slope toward each downspout at ¼" per 10 feet of run. For a 30-ft run, the low end is ¾" lower than the high end. Mark the high point at the fascia — start just below the roofline so the roof edge overhangs into the gutter. Snap a chalk line from the high point to the low point (accounting for the slope). This chalk line is where the top edge of the gutter sits.
Mount gutter hangers along the chalk line. Space them every 24–36 inches (24" is better for areas with heavy rain or snow). Screw into the fascia board — use long screws (at least 2") that reach the rafter tails behind the fascia for solid hold. If your fascia is rotten, replace it first.
It's much easier to join sections, attach end caps, and cut outlet holes while the gutters are on the ground or on sawhorses. Apply gutter sealant to all joints before connecting. Use pop rivets or screws to join sections at slip connectors. Install drop outlets where downspouts will connect. Attach end caps and seal.
Lift the assembled gutter run and snap it into the hangers. Start at the high end and work toward the downspout. For runs longer than 20 ft, have a helper. The front edge of the gutter should sit slightly lower than the back edge for strength. The roof edge should overhang into the gutter by about ½–1 inch.
Attach an elbow (A-style, crimped end pointing down) to the drop outlet. Measure the distance from this elbow to the wall, cut a short section of downspout to connect to a second elbow (B-style) against the wall. From this elbow, run downspout straight down to a third elbow at the bottom directing water away from the foundation. Secure downspout to the wall with brackets every 4–6 ft.
At the bottom of each downspout, add a splash block or a 4–6 ft extension to direct water away from the foundation. Water pooling near the foundation is the number one cause of basement leaks and foundation damage.
Run a garden hose into the gutter at the high point. Watch the water flow toward the downspout — it should move steadily with no pooling. Check all joints for leaks. Verify downspouts discharge water well away from the house. Fix any low spots by adjusting hangers.
Clean gutters twice a year (spring and fall). Check for loose hangers and reattach. Apply fresh sealant to any joints that start leaking. Consider gutter guards to reduce cleaning frequency, but they're not maintenance-free — debris still accumulates on top and requires occasional clearing.
5-inch K-style gutters handle most residential homes. If your roof area exceeds 5,500 sq ft per gutter run, or you're in a heavy-rainfall area, go with 6-inch. Our Gutter Calculator sizes them based on your roof dimensions and rainfall.
¼ inch per 10 feet of gutter run, sloping toward the downspout. For a 40-ft run, the low end should be 1 inch lower than the high end. Too little slope causes pooling; too much looks visibly crooked from the ground.
One downspout per 30–40 feet of gutter run. If you have a 60-ft roofline, you typically need a downspout at each end. Our Gutter Calculator determines exact downspout count based on your roof drainage area.
Aluminum is the standard choice — lightweight, doesn't rust, lasts 20–30 years, and is easy to work with. Vinyl is cheaper but becomes brittle in cold weather and has a shorter lifespan (10–15 years). Copper looks beautiful but costs 5–10× more. Avoid steel gutters — they rust.
Yes, if you're comfortable working on a ladder and can safely reach your fascia. The work itself is straightforward — cutting, joining, and screwing. The main challenge is maintaining the correct slope over long runs and working safely at height. Sectional gutters (10-ft pieces) are DIY-friendly. Seamless gutters require professional equipment.
Rainwater falls directly off the roof edge next to the foundation. Over time this causes soil erosion around the house, basement water intrusion, foundation damage, siding staining, and landscaping damage. Gutters are one of the cheapest ways to prevent very expensive water damage.