Cost breakdown
| Line item | Cost | Notes |
|---|---|---|
| Unit: 18" standard | $400-600 | Smaller capacity, 8-10 settings |
| Unit: 24" full-size | $600-900 | Same capacity as built-in (12-14 settings) |
| Quick-connect adapter | $0-30 | Usually included |
| Installation | $0 | None: just attach to faucet |
| Portable to under-counter conversion | $100-300 | Plumber + materials, voids some warranties |
How portable dishwashers work
- 01Roll on casters from storage to the sink
- 02Snap quick-connect adapter onto the faucet
- 03Plug into a standard 120V outlet
- 04Drain hose hangs over the sink edge into the basin
- 05Run cycle (~1.5-2 hrs)
- 06Disconnect and roll back to storage
Top portable models in 2026
| Model | Width | Capacity | Price |
|---|---|---|---|
| GE GPT145SSLSS | 24" | 12 settings | $695 |
| Whirlpool WDP540HAMZ | 24" | 12 settings | $725 |
| SPT SD-9263SS | 18" | 8 settings | $510 |
| EdgeStar BIDW1801ESS | 18" | 8 settings | $535 |
| Danby DDW1804EBSS | 18" | 8 settings | $485 |
Converting portable to under-counter
When it makes sense: you bought a portable, your situation changed (bought a home, finished a kitchen reno), and you want to make it permanent.
What it costs: $100 to $300 for a plumber to make the conversion. Some models support a factory conversion kit ($50 to $80).
Heads up: Conversion can void warranty on some brands. Check the manual before drilling cabinets or hardwiring.
Portable vs countertop vs built-in
| Feature | Countertop | Portable | Built-in |
|---|---|---|---|
| Capacity | 4-6 | 8-12 | 12-14 |
| Total cost | $200-500 | $400-900 | $725-1,700 |
| Floor space when stored | None | 2x2 ft | None |
| Counter space when running | 2x2 ft | None | None |
| Renter-friendly | Yes | Yes | No |