2021 Mercedes-Benz B Class prices

This 2021 Mercedes-Benz B Class is no longer listed. Here are similar cars for sale now.

There are 42 used 2021 Mercedes-Benz B Class cars for sale from UK dealers on AskCar, as of 9 November 2026. Typical asking price £16,000 (the median: half cost less, half cost more). The cheapest is £10,450. The middle half are priced between £14,500 and £17,000. Median mileage: about 36,000 miles.

Dealers lowered the asking price on more than half of 2021 Mercedes-Benz B Class cars: 23 of the 42 in the 14 days to 9 November 2026.

2021 Mercedes-Benz B Class prices by engine and mileage

EngineAll mileagesUnder 20,000 miles20,000 to 40,000 miles40,000 to 60,000 miles60,000 miles or more
1.3 petrol£16,700Too few for saleToo few for saleToo few for saleToo few for sale

Only 10 of the 2021 Mercedes-Benz B Class cars for sale have the 2.0 diesel engine, too few to give a typical asking price.

Typical asking prices are of 2021 Mercedes-Benz B Class cars for sale on 9 November 2026, and are given only where at least 20 cars with a price are for sale.

2021 Mercedes-Benz B Class against other years

A 2020 Mercedes-Benz B Class car has a typical asking price of £14,300 and a 2022 one £17,700, as of 9 November 2026.

AskCar lists 778 used Mercedes-Benz B Class across the UK, from 624 dealerships.

As of 9 November 2026, AskCar lists 584,619 cars and vans from 12,676 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2021 Mercedes-Benz B Class cars for sale now, page 1 of 2

This page picks out up to 10 cars in each of these groups: best value, cheapest, lowest mileage, recently reduced and newly advertised. A car in more than one group is listed in full once. The groups pick only from cars with photos and an AskCar estimate, priced at £500 or more and no more than 25% under that estimate. 39 of the 41 cars listed here meet these rules. Page 2 lists every other 2021 Mercedes-Benz B Class car, cheapest first, including the 2 the groups do not pick from.

The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 749 priced Mercedes-Benz B Class adverts on AskCar as of 9 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2021 Mercedes-Benz B Class.

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. Each car's AskCar page has its full price history and cheaper cars like it.

This list leaves out 1 car whose advertised mileage is lower than the mileage recorded at its last MOT test.

Best value 2021 Mercedes-Benz B Class: priced furthest below the AskCar estimate

These 10 are priced 3% to 16% under their AskCar estimate. Their asking prices run from £10,450 to £16,950.

Cheapest 2021 Mercedes-Benz B Class: the lowest asking prices

These 10 are priced £10,450 to £14,299. They have covered 35,944 to 80,000 miles.

Lowest-mileage 2021 Mercedes-Benz B Class

These 10 have covered 3,718 to 23,215 miles. Their asking prices run from £16,490 to £22,200.

Recently reduced 2021 Mercedes-Benz B Class: the biggest price reductions in the 14 days to 9 November 2026

The dealer lowered the asking price on each of these 10 in the 14 days to 9 November 2026. Their reductions since AskCar first saw them run from £995 to £2,710.

Newly advertised 2021 Mercedes-Benz B Class: first seen by AskCar in the 7 days to 9 November 2026

This car is the most recently advertised.

Mercedes-Benz B Class by gearbox, fuel and body

Mercedes-Benz B Class prices by year

Mercedes-Benz B Class by trim

Mercedes-Benz B Class by price

Mercedes-Benz B Class near you

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