How much does it cost to bury downspouts?
Burying downspouts is usually the cheapest thing you can do to keep water off a foundation. The cost is plain arithmetic — downspouts times the run each one needs times your price per foot — and the choices that move the number are the run length and the outlet at the end.
Carrying downspouts underground is one of the highest-value, lowest-cost drainage jobs on a house, and the price is easy to pin down: number of downspouts × the buried run each one needs × your installed price per foot. Because the arithmetic is simple, the whole estimate turns on two decisions — how far each line has to run and where it lets the water go. Get those right and the downspout drain cost calculator gives you a number you can hold a contractor to.
The short answer
Price it per foot of buried pipe. A downspout that needs a 20 ft run at $12 a foot is $240 on its own; four of them is $960. But few houses are that tidy, so the honest estimate uses your real runs and your quoted rate. The rate matters as much as the length: an installed foot bundles the trench, the solid pipe, the fittings that tie into the downspout, back-fill and the outlet, so a $9 quote and an $18 quote can both be fair depending on soil, depth, obstacles and how far the crew has to carry water.
A worked example with real numbers
Take a 1930s house with five downspouts. Two front corners reach a daylight outlet on a gentle slope in about 18 ft each; the two back corners need roughly 34 ft to get past a patio; the fifth, on a flat side yard, needs 32 ft to a dry well. The runs average 27 ft. At a quoted $14.50 per buried foot, the pipe cost is 5 × 27 × $14.50 = $1,957.50. The two lines with no lower ground each need a dry well at $220, adding $440, for a planning total of $2,397.50. Notice how the flat-lot lines — longer runs plus a dry well — carry most of the cost; the sloped corners that daylight by gravity are the cheap ones. Because those runs differ so much, it is worth running the calculator once per downspout and adding the results rather than trusting a single average.
What the outlet choice costs you
Every buried line has to end somewhere lower, and the three common terminations sit at different price points:
- Daylight outlet — the pipe runs downhill and empties onto lower ground through a pop-up emitter or an open end. It uses gravity, needs no extra structure, and is the cheapest option wherever the lot slopes away.
- Dry well — a buried gravel-filled pit or perforated barrel that lets collected water soak into the soil. It is the answer on flat lots with nowhere to daylight, and it adds a per-unit cost (and a bit of digging) on top of the run.
- Storm connection — tying into a municipal storm line where local code allows it, which it often does not. Never assume this option; confirm with your building department first.
The rule behind all three is the same: move the water away and gone, not in a circle. A line that discharges a few feet from where it started just feeds the same water back toward the foundation.
Why it is worth doing first
Roof water is enormous and concentrated. A single storm can shed hundreds of gallons off a roof, and a downspout dumping at the wall pours that volume straight into the soil against the footing — the classic cause of a wet basement and hydrostatic pressure on the wall. Managing surface and roof water is the first line of defense that agencies like the U.S. Environmental Protection Agency and FEMA point to before any below-grade system, and the U.S. Department of Energy treats keeping bulk water away from foundations as the foundation of moisture control. That is why burying downspouts — a few thousand dollars at most — belongs at the top of the list, often before you spend on interior drain tile or exterior waterproofing. It also pairs naturally with an exterior French drain and with surface drainage: all three are about carrying water decisively clear of the wall.
What drives the number up or down
Beyond run length and outlet, a handful of things move the per-foot rate. Depth and soil: rocky or root-bound ground trenches slower than loose loam. Obstacles: crossing a driveway, a walkway or mature roots means boring or breaking concrete, which is billed separately. Restoration: putting a lawn or bed back the way it was adds labor. Freeze protection: in cold climates the line and its outlet are pitched and sometimes buried deeper so they drain fully and do not hold ice. When you compare quotes, make sure each one names the run length, the pipe type (solid, not perforated — you are carrying water, not collecting it), the outlet, and what restoration is included; otherwise you are not comparing like with like. Feed the itemized numbers into the cost normalizer if you want a per-line comparison.
DIY versus hiring out
Burying a short, straight run to a daylight outlet on an open lot is within reach for a capable homeowner, and doing it yourself drops the cost to the price of pipe, fittings and a day of digging. The math is the same — your $/ft is just lower because you are not paying installed labor. Hiring out makes sense when runs are long, cross hard surfaces or utilities, need a dry well, or when you simply want it graded and restored properly. Whichever way you go, call to have utilities located before you dig — it is free and it is the law in most places. This is shallow yard trenching rather than excavation against the foundation, so it is lighter-touch work, but the figures here remain planning estimates from your own prices: get an itemized written quote and confirm any local rules about where you may discharge.