Used diesel Mercedes-Benz GLC for sale under £20,000

There are 796 used diesel Mercedes-Benz GLC under £20,000 for sale from UK dealers on AskCar, as of 29 October 2026. Typical asking price £16,500 (the median: half cost less, half cost more). The cheapest is £6,190. AskCar lists 2,831 used Mercedes-Benz GLC across the UK, from 1,154 dealerships.

The middle half of the 796 cars are priced between £14,500 and £18,200.

As of 29 October 2026, AskCar lists 587,923 cars and vans from 12,992 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

272 of the 796 cars had their price reduced in the last 14 days to 29 October 2026.

Median asking price by year

YearFor sale with a priceMedian asking priceMiddle half priced between
202046£18,900£18,000 to £19,800
2019136£18,000£16,500 to £19,000
2018237£16,400£15,000 to £18,000
2017219£16,300£14,000 to £17,600
2016125£14,000£12,500 to £15,800
201521£12,500£12,000 to £14,700

Cars for sale now, page 7 of 8

Best value first: the cars priced furthest below their AskCar estimate come first, and those without one come after. The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 2,798 priced Mercedes-Benz GLC adverts on AskCar as of 29 October 2026.

Each car: year, make, model, engine and trim, power, gearbox, fuel, body, doors, colour; mileage; price and its changes; how the price compares with the AskCar estimate; emissions standard and ULEZ compliance where it holds; MOT; dealer and town; AskCar page.

Cheaper cars like each one, with its price history, are on its AskCar page.

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