Greenfield, MA84 Birch St, Greenfield, MA 01301
Verified record
Douglas J Mahon Plumbing has an A+ grade from the Better Business Bureau. Massachusetts lists Douglas J Mahon's plumber license as expired, as checked against the state registry on September 29, 2026.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from Douglas J Mahon Plumbing. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$290 – $710
Typical plumbing job around $500
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No changes recorded yet — last scanned Oct 1, 2026.
Next-day furnace install4.6
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Mini-split units planned room by room3.9
Condensing furnace installation3.2
