About Cornerstone Plumbing Services
Founded in 1999 in Washington, DC, Cornerstone Plumbing Services has grown into one of the most trusted independent well-respected plumber shops in the area. The crew specializes in residential service work — leaks, clogs, water heater service and replacement, gas lines, fixture upgrades, repipes, and sewer line repair — and is well known for the lengthy "we will not start work without explaining the price first" written estimate it provides on every visit. Backed by a 100% satisfaction guarantee and an active state license, Cornerstone Plumbing Services is a popular pick for both single-job homeowners and rental property managers across Washington.
Cornerstone Plumbing Services serves homeowners across Washington, DC and surrounding ZIP codes including 20001, 20003, 20007, 20011, 20016. Pricing is up-front and quoted in writing before any work begins, with no obligation if the estimate isn't right for your project.
Services offered
- Water filtration systems
- Tankless water heater specialist
- Water heater install & repair
- Garbage disposal service
- 24/7 emergency response
Service area
Cornerstone Plumbing Services covers Washington and the surrounding metro, typically responding to addresses within 25–35 miles of 20003. Same-day appointments are commonly available for non-emergency requests booked before noon, and 24/7 emergency dispatch is offered for active leaks, electrical hazards, no-heat/no-cool calls, and lockouts when applicable.
Licensing & insurance
FixNearMe verifies that Cornerstone Plumbing Services holds an active DC contractor license (#DC-806563) and carries general liability insurance covering work at residential properties. We re-verify licensing annually and remove any pro whose status lapses or whose review pattern deteriorates.
How to request a quote
Use the free quote form on this page to send your job details directly to Cornerstone Plumbing Services and up to two other nearby plumbers in Washington. You'll receive up-front written quotes — usually within an hour during business hours — so you can compare apples to apples before booking.