Cost to Install a Dishwasher Air Gap
Installing a dishwasher air gap involves mounting the device through the sink deck or countertop, then connecting the dishwasher drain hose and a discharge hose to the sink drain or garbage disposal. It is an easy DIY project when there is an existing mounting hole and enough room below the sink, but drilling a new countertop hole and routing the hoses carefully take added care.
- Dishwasher air gap1 each @ $20$20
- Supplies subtotal$16–$28
- Labor$85–$130
- Permits & fees$50
Based on 1 air gaps (typical size). Figures are ballparks — get a contractor quote to confirm.
Common reasons homeowners do this job
- Preventing dirty wastewater from flowing back into the dishwasher
- Replacing an air gap that is worn or damaged
- Adding an air gap during a sink-area plumbing upgrade
- Connecting a dishwasher drain setup that needs an air gap
- Using an existing hole near the sink faucet for an air gap installation
DIY or call a pro?
This is a DIY-friendly task, but a professional is worth considering if drilling a new hole through the countertop feels uncomfortable or if the under-sink hose connections are difficult to reach. Turn off power to the dishwasher before working under the sink, use caution around plumbing or electrical lines when drilling, and test every connection for leaks after installation.
Frequently asked questions
- Can I install a dishwasher air gap myself?
- Yes. The job is straightforward if there is an existing countertop or sink-deck hole, adequate clearance under the sink, and comfort connecting hoses with clamps. Consider professional help if creating a new hole or making the drain connections is outside your comfort level.
- What makes dishwasher air gap installation cost more?
- The price can rise with the number of air gaps, labor time, and the materials needed, including the air gap kit, drainage hose, and stainless steel hose clamps. A small job may also include a minimum or trip charge.
- What should I check before installing an air gap?
- First, look for an existing hole near the sink faucet and confirm there is enough room below the sink for the air gap body, hose connections, and clamps. If the sink deck is solid, installation requires drilling a hole through the countertop or sink deck.
- Which air gap ports connect to the dishwasher and drain?
- The dishwasher drain hose attaches to the smaller inlet port. The larger outlet port connects by discharge hose to the garbage disposal or sink drain tailpiece; secure both hose connections with clamps, then run a dishwasher test cycle and check all connection points for leaks.
Have a different situation?
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