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Robot vacuum · Used price guide
The camera-navigation benchmark for pet households. Used values have softened as the j9+ and j9 expanded the range, creating a reliable buying window 35–40% below retail. Single-owner, boxed units with the Clean Base dock and battery health above 85% are the sweet spot.
Resale index · Jul 2025 = 100
Down 6.8% year on year. Best buying window: August.
A used Roomba j7+ with the Clean Base dock, battery health above 85%, and under 18 months old should be priced at £340 to £430. Units without the Clean Base dock should be £100 to £130 less to reflect the missing hardware.
The Robot AutoTrader Resale Index shows the Roomba j7+ at an index value of 93.2 — down 6.8% year on year. This reflects new model launches pushing older units into the secondhand market at greater volume. At £380 used versus £549 new, the discount is around 30%.
August and September, when spring upgrade-cycle supply peaks and demand softens before the Christmas gifting season. Expect prices 8 to 12% lower than the January to March window.
Yes, particularly for households with pets. The j7+'s camera-based obstacle avoidance — designed specifically to identify and avoid pet waste — remains the best consumer implementation in its price range used. The bench test score of 8.7/10 after 12 months of daily use confirms long-term reliability.
See current iRobot Roomba j7+ listings
Every listing shows measured battery health, owner count, and a price benchmarked against this index.