A dishwasher installation involves three connections — water supply, drain, and electrical. Get any of them wrong and you're looking at leaks, backflow, or poor performance. STL Plumbing Pros handles the plumbing connections for dishwasher installations — hot water supply, proper drain routing with air gap or high loop, and leak testing.
What's Included
Hot water supply connection — proper valve and braided supply line.
Drain connection — to garbage disposal or sink tailpiece with air gap or high loop per code.
Slide unit into place and level — proper alignment prevents door issues and leaks.
Run a full cycle and check for leaks at every connection.
Old unit removal and disposal (if replacing).
Our Process
Prep & Connect
Shut off water, connect supply line, route drain hose with proper backflow prevention. Slide unit in and level.
Test
Run a full wash cycle, monitor all connections for leaks, verify proper drain flow.
Clean Up
Remove old unit (if applicable), clean the work area, walk you through any new features.
What Does Dishwasher Installation Cost?
| Service | Price Range | Details |
|---|---|---|
| Standard Replacement Install | $150–$300 | Disconnect old, connect new unit |
| New Installation (no existing) | $300–$600 | New drain, supply, and electrical hookup |
| Air Gap Installation | $50–$100 | Required by code in many jurisdictions |
| Old Unit Removal | Included | We disconnect and remove the old unit |
* Prices are estimates. We provide exact pricing after diagnosis. No hidden fees.
What Our Customers Say
"Replaced our old dishwasher. Plumbing connections were perfect — no leaks, proper drain setup. Clean work."
"First-time dishwasher install in our older home. They ran the supply line and drain connection professionally."
"Quick replacement install — old one out, new one in, tested and done in about an hour."