The 10 Best Plumbing Companies in Delaware — 2026

We compared all 99 plumbing companies in Delaware on the data that matters: services offered, posted hours, and how easy each one is to reach. No pay-to-play — this ranking comes straight from the listings data, updated November 2026.

#1 · B Walls & Sons IncMillsboro

(302) 856-4045 Website View listing

#2 · Done Right TodayWilmington

(302) 433-6273 Website View listing

#3 · Big Red Services - Hvac, Plumbing, ElectricWyoming

(302) 985-5858 Website View listing

#4 · Lighthouse PlumbingLewes

(302) 645-8477 Website View listing

#5 · Assurance Plumbing CompanyNew Castle

(302) 324-0403 Website View listing

#6 · Best Price Heating, Cooling, PlumbingSeaford

(302) 629-3753 Website View listing

#7 · Collins Mechanical IncHarrington

(302) 398-8877 Website View listing

#8 · Delaware Plumbing ProfessionalsWilmington

(302) 308-5535 Website View listing

#9 · Drip Plumbing Services, LLCElsmere

(302) 563-5026 Website View listing

#10 · Federal Mechanical ContractorsNew Castle

(302) 656-2998 Website View listing

Run one of these businesses? You earned this spot — email contact@plumbingatlas.com for your free “Top Plumbing Companies in Delaware” badge to put on your site, and we’ll make sure your listing stays accurate.
How we rank: every listing earns points for listed services (drain service, water heaters, sewer service, emergency service), posted hours, and working contact details. The ranking is recalculated with every data update.