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Walter D. Sullivan Company traces its history to a plumbing and heating business founded in 1926 by Walter D. Sullivan Sr. The New Britain company describes its installation work on BBB as plumbing, medical gas, heating, ventilation and air conditioning for commercial, industrial and institutional applications. Its Connecticut plumbing license is active. Procore also lists plumbing and HVAC among its offered services, while BuildZoom shows 35 projects. BBB assigns the company an A+ grade, and Google displays 5 stars from one rating.
“He worked for Walter D. Sullivan Mechanical Contractors for over 30 years.”
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1 change recorded — last scanned Oct 30, 2026.
Typical Connecticut range for this kind of work, from regional averages — not a quote from Walter D Sullivan Co Inc. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$270 – $660
Typical plumbing job around $470
