Estimating storm sewer costs by the foot helps planners set budgets and compare bids. Typical prices hinge on pipe material, trench work, backfill, and local permits. The storm sewer cost per foot will vary with diameter, depth, and site access, but ranges below offer practical planning guidance.

Item	Low	Average	High	Notes
Piping material (per ft)	$8	$22	$60	PVC or ductile iron choices impact price
Trench and backfill (per ft)	$12	$28	$70	Soil type and excavation depth matter
Labor to install (per ft)	$15	$40	$120	Region and crew size drive variation
Permits and design (per ft)	$1	$6	$20	Depends on locality and project scope
Delivery and disposal (per ft)	$1	$5	$12	Hauling spoil and pipe segments

Assumptions: Midwest or varying regional labor, standard 8-24 inch storm sewer, normal access, no special lining.

Material selection drives the largest portion of the per-foot cost. PVC pipes typically cost less per foot than ductile iron for smaller diameters, while larger diameters push up both options. A common scenario uses 12–24 inch PVC with standard joint seals, yielding per-foot installed prices around $22-$40 on average, with lows near $15 and highs near $70 for difficult sites. For ductile iron in the same size, expect $28-$60 per foot installed, depending on coating and joint type. Concrete or brick-inlet sections add to the foot price, especially in urban corridors where piping depth is greater.

Pipe Type	Diameter (in)	Low	Average	High	Notes
PVC	12-24	$15	$28	$60	Most economical for residential to small commercial
Ductile iron	12-24	$20	$38	$75	Better for surge and rockier ground

Assumptions: Standard trench width, minimal bedding, typical backfill, and no special linings.

Shallow, narrow trenches cost less than deep, wide excavations. In sandy soils, backfill is simpler; in clay or rocky soils, disposal and stabilization raise the price. For a typical residential install at 3–6 feet deep, trench and backfill can be $12-$40 per foot, with higher costs when shoring or trench boxes are required. In urban basements or street rights‑of‑way, trenching is often more complex, adding $15-$50 per foot for curb restoration and traffic control. Depth and soil type are the strongest cost drivers for this component.

Factor	Low	Average	High	Notes
Depth (feet)	3-4	4-6	6-10	Greater depth increases spoil and bedding needs
Soil type	Sand/loam	Clay/rock	Poorly graded/peat	Affects trench width and backfill
Trench width (feet)	1-2	2-4	4-6	Wider trench raises material and labor

Assumptions: Standard bedding, no rock blasting, normal access, no weather delays.

Permits and inspections add a predictable per-foot layer to the bill, typically $1-$20 per foot depending on municipality and project scope. In high‑density regions or flood‑plains, permit costs can be noticeably higher due to review time and additional compliance steps. Local codes may require additional testing or lining, raising the average to higher tiers. Regional labor rates also shift the per-foot cost by roughly 10–25% compared with national averages.

Cost Component	Low	Average	High	Notes
Permits	$1	$6	$20	Varies by city and scope
Inspections	$0	$2	$8	Often bundled with permits
Design fees	$0	$2	$6	Minor projects

Assumptions: Normal long‑lead processes, standard plan reviews, and typical right‑of‑way access.

Labor costs per foot reflect regional wage ranges and crew efficiency. In the Midwest, skilled labor might run $25-$50 per hour with smaller crews, while West Coast markets may exceed $60 per hour. For a 10–40 hour job scaled to per-foot pricing, expect roughly $15-$40 per foot for labor on average projects. A two‑person crew and a single shift can reduce total per‑foot cost in non‑urban areas; more crew members and longer schedules push it higher. Labor is often the largest variable in the per-foot calculation.

Region	Hourly Rate	Typical Crew Size	Per‑Foot Labor Range	Notes
Midwest	$25-$40	2	$15-$28	Common efficiency
West	$40-$70	2-3	$25-$60	Higher wage areas

Assumptions: Standard trenching, no extensive shoring, typical access, conventional equipment.

System scale matters: larger diameter and multi‑run storms increase per‑foot costs as pipes, manholes, and inlets multiply. A single 18-inch line with a couple of pit inlets averages around $28-$50 per foot installed, while a 30-inch trunk plus connections can push toward $75-$120 per foot in dense urban zones. For rural layouts with simple routing, $20-$40 per foot is common. Diameter and number of connections are concrete price drivers.

Scenario	Diameter	Per‑Foot Range	Notes
Residential driveway drainage	12-18	$22-$55	Often combined with downstream curb stops
Municipal storm trunk	24-30	$50-$120	Higher due to long runs and joints

Assumptions: Standard joints, no epoxy lining, typical backfill materials, no traffic disruption beyond standard barriers.

Cost per foot for storm sewer projects can swing by region due to weather, labor availability, and permit regimes. In Southern states with milder winters, install times can be faster, sometimes lowering overall costs; in New England or Pacific Northwest, cold weather and restricted windows raise costs by 5–15%. For a quick regional comparison, a 40‑foot run might cost $1,200 in the Southeast, $1,600 in the Midwest, and $2,800 in parts of the West Coast, reflecting labor, soil, and permit differences. Regional deltas matter for budgeting and bid comparison.

Region	Low (per ft)	Average (per ft)	High (per ft)	Notes
Southeast	$14	$28	$60	Generally lower soil and labor costs
Midwest	$16	$34	$72	Varies by ground condition
West Coast	$25	$45	$110	Higher wage and permitting costs

Assumptions: Typical residential to small commercial scope; no emergency timelines or major redevelopments.