Smoke Test Plumbing Cost in Boston (And What You Actually Get)

Smoke test plumbing is one of those services most homeowners don't know exists — until a sewer smell takes over the house and nobody can find the source. Here's what it actually costs in Greater Boston, what you get for the money, and when it's worth it.

What you're paying for

Smoke test plumbing isn't a parts-and-labor job. The deliverable is information — specifically, a written report that tells you exactly where your drain-waste-vent system is leaking and what it'll take to fix it. The smoke is just how we find what goes in the report.

See our full explainer on what a sewer smoke test is and how it works for the diagnostic side. This article is about the money.

Greater Boston pricing

• Single-family residential: $395–$650. Most single-family smoke tests fall here. Takes 1–2 hours on-site including setup and the walk-through, plus the written report.
• Small multi-unit residential (2–6 units): $650–$1,200. We zone the test so tenants are notified and any sensitive occupants are accounted for. Half a day on-site.
• Larger commercial, restaurants, and multi-unit (7+): Quoted on-site. Cost depends on building size, how the DWV system is laid out, and how many zones we need to test.
• Municipal infiltration & inflow (I&I) studies: Project-based pricing — typically a daily rate plus a per-defect report fee. Talk to us about scope.

What the report actually contains

Every Mr. Drain smoke test ends with a written report. That report is what you hand to your contractor, your buyer, your seller, or your municipality. It includes:

• Photos of every location where smoke escaped — wall cavities, attic spaces, slab cracks, lawn, neighboring storm drains.
• A diagram or description of where in the building each escape point is.
• The likely cause of each escape — cracked vent stack, missing cleanout cap, dry trap, broken sewer line, illegal storm cross-connection.
• The recommended repair for each defect, and an estimate range for that repair if you'd like one.

When smoke test plumbing pays for itself

A $400 smoke test that locates a cracked vent stack inside a second-floor wall in 90 minutes saves you the alternative: opening drywall in three places trying to find it, weeks of odor-masking that don't work, and a buyer or tenant complaint that escalates. Same math for restaurant kitchens, multi-unit odor complaints, and pre-listing inspections.

For background on when to run one and how it compares to camera work, see our piece on what a sewer camera actually shows — the two are complementary, not competitive.

Bottom line

Smoke test plumbing in Greater Boston is $395–$650 for most homes, scales up for commercial and multi-unit work, and comes with a written report you can hand to anyone. If you've got a sewer smell nobody can explain, this is the test that finds it.

Mr. Drain Inc. provides sewer smoke testing across Boston, Greater Boston, and the South Shore. Owner-operated, fully insured drain technicians. Family-owned since 1993.