Adding a new downspout usually costs $75 to $300 installed, and rerouting an existing one typically runs $100 to $500. The price depends on the material (aluminum vs. copper), the length of the run, how many elbows are needed, and whether the water needs to be carried underground or to a drainage system. Most homeowners spend around $150–$250 for a straightforward add-on using standard aluminum.
What is a downspout and why might you need another one?
A downspout is the vertical pipe that carries water from your gutters down to the ground. Most homes have one downspout per 30–40 feet of gutter, though this varies based on roof size and rainfall. If your gutters overflow during heavy rain, water pools next to your foundation, or one section of gutter sags from holding too much water, you likely need an additional downspout.
Rerouting is different — that means moving an existing downspout to discharge water in a better location. Common reasons include directing water away from a foundation, a walkway, a flower bed, or a neighbor's property line.
How much does it cost to add a new downspout?
For a standard single-story home, adding one new downspout typically costs:
| Material | Installed Cost (per downspout) |
|---|---|
| Aluminum (most common) | $75–$200 |
| Vinyl | $50–$150 |
| Galvanized steel | $150–$300 |
| Copper | $300–$700 |
| Zinc | $250–$500 |
These prices assume a one-story house with roughly 10 feet of vertical run. A two-story home will add roughly $50–$150 because of the extra length, ladder work, and labor time.
The cost generally breaks down as follows:
- Materials: $20–$80 for aluminum downspout sections, elbows, brackets, and outlet
- Labor: $50–$150 for 1–2 hours of installation
- Cutting the gutter and installing an outlet: usually included, but some contractors charge $25–$50 extra
How much does it cost to reroute a downspout?
Rerouting costs more than a straight add-on because the contractor has to remove the existing downspout, patch the old outlet hole (or relocate it), and reinstall everything in the new location. Expect to pay:
- Simple reroute (same wall, new exit point): $100–$200
- Moderate reroute (around a corner or to a different wall): $200–$350
- Complex reroute (long horizontal runs, multiple elbows, or tying into underground drainage): $350–$500+
If the old outlet hole in the gutter needs to be patched, factor in another $25–$75 for the patch or a small gutter section replacement.
What about underground drainage extensions?
Many homeowners add a downspout and then realize the water still pools next to the house. Connecting the downspout to an underground drain pipe (usually 4-inch corrugated or PVC) carries water 10–20 feet away from the foundation. This adds significant cost:
| Type of Extension | Typical Cost |
|---|---|
| Above-ground splash block | $10–$30 |
| Flexible above-ground extension (4–6 ft) | $15–$40 |
| Buried corrugated pipe (per linear foot, installed) | $10–$30 |
| Buried PVC with pop-up emitter (full install) | $400–$1,500 |
| Connection to existing French drain or dry well | $500–$2,500 |
If you live in an area with clay soil, freeze-thaw cycles, or strict stormwater rules, underground drainage may be required rather than optional. Check with your municipality before assuming a splash block is enough.
What factors change the price the most?
Home height
A two-story house generally adds 30–50% to the labor portion. A three-story house can double it. Contractors charge more for ladder safety setup and the additional vertical material.
Number of elbows and offsets
Each elbow costs $5–$15 in materials, but the bigger cost is labor — every bend takes time to measure, cut, crimp, and secure. A downspout that has to navigate around a bay window or chimney can easily add $50–$100.
Material match
If your existing gutters are copper or zinc, your new downspout has to match — both for appearance and to avoid galvanic corrosion (where two different metals corrode when they touch). Matching is non-negotiable on copper systems.
Accessibility
Tight side yards, landscaping, fencing, or HVAC units in the way all add labor time. Some contractors add a $50–$100 "difficult access" fee.
Minimum service fees
Most gutter contractors have a minimum service charge of $150–$250. Even if your job only needs 30 minutes of work, you'll pay the minimum. Bundling the downspout with other gutter work (cleaning, repairs, guards) often makes more financial sense than calling for a single small task.
Can you add or reroute a downspout yourself?
Adding a downspout is one of the more DIY-friendly gutter tasks if you're comfortable on a ladder. A basic aluminum kit with three 10-foot sections, two elbows, an outlet, and brackets runs $40–$80 at home improvement stores. You'll also need tin snips, a drill, sheet metal screws, and gutter sealant.
The trickier parts are cutting a clean outlet hole in the existing gutter without distorting it, and getting the pitch and bracket spacing right so the downspout doesn't pull away in heavy rain or ice. If you have two-story gutters, seamless gutters, or any copper work, hire a pro — the savings on a DIY job rarely justify the risk.
How do you know if you actually need another downspout?
Look for these signs after a heavy rain:
- Water overflowing the front edge of the gutter (not just the back, which usually means clogs)
- A section of gutter visibly sagging or pulling away from the fascia
- Soil erosion or mulch washout directly below a gutter section
- A long gutter run (over 40 feet) with only one downspout
- Basement seepage or foundation cracks below specific gutter sections
The general rule of thumb in residential gutter design is one downspout for every 30–40 feet of gutter, or one per 600–800 square feet of roof area drained. If your home exceeds those numbers, adding a downspout is almost always cheaper than dealing with the water damage that follows.
How can you keep the cost down?
- Bundle the work. If you're already getting gutters cleaned, repaired, or replaced, ask the contractor to add the downspout during the same visit.
- Stick with aluminum. It's the most common, most affordable, and most durable material for the price.
- Get 2–3 quotes. Prices for the same job can vary by $100–$200 between contractors, especially for small jobs where minimum fees apply.
- Handle the extension yourself. Splash blocks and flexible extensions are easy DIY add-ons after the contractor leaves.
- Skip seamless for short runs. Sectional aluminum downspouts work fine and cost less than custom seamless pieces.
Get matched with a local contractor using the form on our home page. Most pros will give you a free quote for a single downspout add-on, and many will roll it into a larger gutter service visit at a discount.
Frequently Asked Questions
A straightforward downspout installation takes 1–2 hours for a one-story home. Two-story installations or jobs requiring underground drainage connections can take 3–5 hours or more. Most contractors complete the work in a single visit.
For a standard above-ground downspout, no permit is typically required. However, if you're tying into a municipal storm drain or installing underground drainage that crosses property lines, your city may require a permit and inspection. Check with your local building department.
At minimum 4–6 feet from the foundation, but 10 feet or more is much better, especially if you have clay soil or a basement. Splash blocks, flexible extensions, or buried drain pipes all work — the key is moving water far enough that it doesn't soak back toward the foundation.
Sometimes. If your gutter overflows because water travels too far before reaching the existing downspout, you need a new downspout, not an extension. Extensions only help with where the water goes after it exits — they don't fix overflow problems.
Not if it's done correctly. The contractor cuts a clean outlet hole, installs an outlet drop, and seals it. A poorly cut hole or missing sealant can cause leaks, which is why DIY installations sometimes fail. Always seal the outlet with quality gutter sealant rated for the climate.
They're the same thing. "Leader" is an older or regional term, mostly used in the Northeast US, while "downspout" is the more common term nationally. Some contractors also use "conductor" for ornamental copper or decorative versions.
Rectangular (typically 2x3 inch or 3x4 inch) is standard and cheapest. Round downspouts are usually decorative or used on historic homes, and they cost 30–60% more. Functionally, a 3x4 inch rectangular downspout handles about 1,200 square feet of roof and is the better choice for high-rainfall areas.
Never connect a downspout to a sanitary sewer — it's illegal in most municipalities and overloads the system. Connecting to a sump pump discharge line is sometimes allowed but generally not recommended, since heavy rain can overwhelm the pump. A dedicated storm drain, dry well, or surface discharge is the right approach.
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