2023 BMW 3 Series prices under £20,000

There are 44 used 2023 BMW 3 Series cars for sale under £20,000 from UK dealers on AskCar, as of 8 November 2026. Typical asking price £18,500 (the median: half cost less, half cost more). The cheapest is £14,600. The middle half are priced between £17,200 and £19,600. Median mileage: about 82,000 miles.

Dealers lowered the asking price on more than half of 2023 BMW 3 Series cars under £20,000: 24 of the 44 in the 14 days to 8 November 2026.

AskCar lists 7,130 used BMW 3 Series across the UK, from 2,708 dealerships.

As of 8 November 2026, AskCar lists 595,629 cars and vans from 12,891 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2023 BMW 3 Series cars for sale now under £20,000, 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. All 43 cars listed here meet these rules. Page 2 lists every other 2023 BMW 3 Series car, cheapest first.

The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 6,822 priced BMW 3 Series adverts on AskCar as of 8 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2023 BMW 3 Series.

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 2023 BMW 3 Series: priced furthest below the AskCar estimate

These 10 are priced 3% to 8% under their AskCar estimate. Their asking prices run from £17,300 to £19,995.

Cheapest 2023 BMW 3 Series: the lowest asking prices

These 10 are priced £14,600 to £17,155. They have covered 75,197 to 123,000 miles.

Lowest-mileage 2023 BMW 3 Series

These 10 have covered 47,000 to 71,507 miles. Their asking prices run from £17,300 to £19,999.

Recently reduced 2023 BMW 3 Series: the biggest price reductions in the 14 days to 8 November 2026

The dealer lowered the asking price on each of these 10 in the 14 days to 8 November 2026. Their reductions since AskCar first saw them run from £1,100 to £3,845.

Newly advertised 2023 BMW 3 Series: first seen by AskCar in the 7 days to 8 November 2026

These 4 are the most recently advertised. Cars first seen on the same day are listed cheapest first.

BMW 3 Series by gearbox, fuel and body

BMW 3 Series under £20,000 by gearbox, fuel and body

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