# Mercedes B-Class — Used Car Buying Guide

AutoScout's analysis of the Mercedes B-Class on the UK used-car market. Backed by 33 million DVSA MOT tests, current AutoTrader pricing, and depreciation curves derived from CAP/Glass's Guide data.

Live interactive report: https://autoscout.fyi/cars/mercedes-b-class

## Verdict

- **Best value year**: 2021
- **Ideal trim**: SE
- **Target mileage**: 30,000–50,000 miles
- **Max previous owners**: 2
- **Target price**: £19,000

## Why this model

The Mercedes B-Class is a really practical and comfortable family car, often overlooked but offering a lot of space in a relatively compact footprint. It's got that premium Mercedes feel inside, with a high-quality interior and a good level of tech, especially on the 2021 models. The diesel engines, like the B200d, are known for being quite economical on longer runs, making it a solid choice if you do a fair bit of motorway driving. It's a great blend of practicality, comfort, and a touch of luxury without being overly flashy.

## What you should pay

Based on current UK market data for February 2026, a 2021 Mercedes B200d SE with around 30,000-50,000 miles typically sits around £19,000. Prices can vary a bit depending on exact mileage, condition, and optional extras, but this is a good target to aim for. You might find slightly cheaper ones with higher mileage or more owners, but this price point offers a good balance of age, condition, and remaining life.

## Which trim to buy

The 'SE' trim is often the sweet spot for the B-Class. While it's the entry-level, it still comes with a good amount of standard equipment, including the excellent MBUX infotainment system, comfortable seats, and practical features. It avoids the stiffer ride that can come with the larger wheels and sportier suspension of the AMG Line, making it more comfortable for everyday driving, especially on UK roads. You get the premium feel without paying extra for features you might not need or for a firmer ride.

## What to check before you buy

- Infotainment glitches (software updates often resolve)
- DPF issues if mainly used for short city drives (common for diesels)
- AdBlue system faults (diesel specific)
- Minor suspension noises on some older models

## Running costs

For a B200d diesel, you're looking at decent fuel economy, typically around 50-55 mpg. At current diesel prices (around 160p/litre), that works out to roughly 14.5p per mile for fuel. Road tax (VED) for a 2021 model will be around £180 per year. Insurance costs are moderate, usually in the £500-£800 range annually, depending on your personal details. Servicing costs for a Mercedes can be a bit higher than a mainstream brand, so budget around £300-£500 a year for routine maintenance, especially if you use a main dealer.

## Key stats

- **Fuel Type**: Diesel
- **Horsepower**: 150 hp
- **Mpg**: 50-55 mpg
- **Reliability Score**: Good (7/10)
- **Safety Rating**: 5-star Euro NCAP (2019)

## Trim comparison

| Trim | Price new | Price used | Key features |
| --- | --- | --- | --- |
| B180 SE (Petrol) | £27,000 | £14,000 | MBUX infotainment system with 7-inch touchscreen; Comfort seats; LED headlights |
| B200d Sport (Diesel) | £30,000 | £16,000 | MBUX infotainment system with 10.25-inch touchscreen; Sport seats; Dual-zone climate control |
| B200 AMG Line (Petrol) | £32,000 | £18,500 | AMG body styling; Sports suspension; Artico leather/Dinamica microfibre upholstery |

## Depreciation forecast

| Year | Estimated value | Retention |
| --- | --- | --- |
| 2026 | £19,000 | 100% |
| 2027 | £16,910 | 89% |
| 2028 | £15,388 | 81% |
| 2029 | £14,157 | 75% |
| 2030 | £13,166 | 69% |

The B-Class, like many premium compacts, experiences its steepest depreciation in the first few years. Buying a 3-4 year old model (like a 2021 in 2026) means someone else has taken the biggest hit. You'll still see a steady decline in value, but it's much slower. The sweet spot for selling would likely be around the 6-8 year mark, before major components might need replacing and while it still feels relatively modern.

Total value lost since new: 30.7%.

## Alternatives to consider

- BMW 2 Series Active Tourer
- Volkswagen Golf SV
- Kia Ceed Sportswagon

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Source: AutoScout (https://autoscout.fyi). Part of a review of the UK used-car market across 500+ models.