Mercedes-Benz GLB buyer’s guide
Got a growing family and an eye for style? The Mercedes-Benz GLB might just be your perfect match. It's a compact SUV that punches well above its weight—offering seven seats, premium finishes, and a boot big enough to handle everything life throws at you.
Whether you're after a used Mercedes GLB for the school run, weekend adventures, or long motorway miles, this guide covers everything you need to know before buying.
Is the Mercedes-Benz GLB a Good Car?
In short? Yes. The GLB launched in 2019 as Mercedes-Benz's answer to families who want practicality without sacrificing luxury.
It sits between the GLA and GLC in Mercedes' SUV lineup, but it's the only one offering an optional third row of seats. For growing families, that's a big deal.
The boxy, upright design isn't just stylish—it's practical. The tall roofline creates genuinely usable headroom, and the interior feels premium without being intimidating. It's the kind of car that makes the daily commute feel a little more civilised.
Reliability is solid too. The GLB shares its platform with the A-Class and B-Class, both well-regarded for long-term dependability. Choose wisely and a used GLB can deliver years of comfortable, stress-free driving.
Key Features of the Mercedes GLB
Interior Space and Technology
The GLB's cabin is where it really earns its stripes. The second row slides and reclines, and the optional third row fits two adults at a push—or kids comfortably on shorter journeys.
Boot space is generous even with all seats in use, and clever storage compartments throughout the cabin mean you're never short on room for bags, snacks, or the inevitable football kit.
Inside, you'll find Mercedes' MBUX infotainment system—a standout feature. The dual-screen setup (combining the digital instrument cluster with a central touchscreen) is intuitive, responsive, and genuinely enjoyable to use.
Most trims include:
- Apple CarPlay and Android Auto
- Voice control via the "Hey Mercedes" command
- Wireless charging (on higher trims)
- Ambient interior lighting
Higher-spec models also come with augmented reality navigation—a genuinely helpful feature when navigating busy city centres.
Performance and Engine Options
The GLB comes in petrol and diesel variants, with a plug-in hybrid (GLB 250e) also available on the used market.
Key engine options include:
- GLB 200 – 1.3-litre petrol, 163 hp. Smooth and efficient for urban and mixed driving.
- GLB 220d – 2.0-litre diesel, 190 hp. Excellent for motorway drivers who want strong mpg.
- GLB 250 – 2.0-litre petrol, 224 hp. The pace pick of the petrol range.
- GLB 250e – Plug-in hybrid with up to 30 miles of electric range. A smart pick if you do lots of short trips.
- AMG GLB 35 – 306 hp and 4MATIC all-wheel drive for those who want the sportier side of family life.
Most models offer 4MATIC all-wheel drive, making the GLB a composed choice in wet or wintery conditions.
Comparing the Mercedes GLB with Competitors
The GLB competes in a busy segment. Its main rivals include the BMW X1, Volvo XC40, and Kia Sportage.
The GLB's trump card is clear—no other car in this class offers seven seats at this price point. For families that occasionally need that extra row, it's a compelling advantage. The premium badge and interior quality also give it an edge over the Kia Sportage in terms of refinement, while it holds its own against BMW and Volvo on space.
Buying Considerations
What to Check on a Used Mercedes GLB
Buying used can feel daunting, but a little preparation goes a long way. Here's what to look out for:
- Service history: A full Mercedes-Benz service history is a strong sign of a well-cared-for car. Check stamps match the mileage.
- Software updates: MBUX systems can have teething issues on earlier models. Ask if software updates are up to date.
- Tyre wear: Uneven tyre wear can signal alignment or suspension issues. Check all four corners.
- Third-row condition: If buying a seven-seater, check the third row folds and unfolds smoothly and that the mechanism isn't stiff or damaged.
- Hybrid battery health (GLB 250e): Ask for battery diagnostics if buying the plug-in hybrid variant.
- Paintwork: Inspect for any signs of minor scrapes, particularly around the wheel arches and lower bumpers.
Always take it for a proper test drive—not just a gentle loop around the block. Motorway speeds will reveal far more about how the car handles.
Frequently Asked Questions
What makes the Mercedes GLB a suitable option for families?
The GLB is one of the few compact premium SUVs to offer an optional third row, making it a genuine seven-seater. The second-row seats slide forward to create more legroom, and the boot remains usable even with all seats occupied. The cabin is packed with family-friendly features including multiple USB ports, ample storage, and a highly intuitive infotainment system. Strong safety ratings from Euro NCAP round off its family credentials nicely.
What should buyers look for when purchasing a used Mercedes GLB?
Focus on full-service history, especially from Mercedes-Benz main dealers where possible. Check for any software issues with the MBUX system—these were more common on early 2019–2020 models and are usually resolved via updates. Inspect the third-row seating mechanism if buying the seven-seat version, and look for signs of wear around the infotainment screen. A pre-purchase inspection from a qualified mechanic is always a worthwhile investment, giving you peace of mind before committing.
Does the Mercedes GLB have Apple CarPlay?
Yes. Apple CarPlay comes as standard across the GLB range, paired with Android Auto. It integrates seamlessly with the MBUX dual-screen system, letting you access maps, music, and messages through the central touchscreen. From 2021 onwards, wireless Apple CarPlay became available on higher-spec trims, removing the need for a cable connection entirely.
Does the Mercedes GLB have a heated steering wheel?
A heated steering wheel is available on the Mercedes GLB, though it depends on the trim level and optional extras specified at the time of purchase. It typically comes as part of a winter or comfort package. When browsing used models, it's worth checking the original order specification or asking the seller directly. On Cazoo, full vehicle specs are listed clearly so you know exactly what you're getting before you buy.
How long is a Mercedes GLB?
The Mercedes GLB measures 4,634mm in length, 1,834mm in width, and 1,663mm in height—making it noticeably taller than rivals like the BMW X1, which is where the seven-seat packaging becomes possible. Despite its generous dimensions, the GLB is still manoeuvrable enough for city driving and fits comfortably in a standard UK parking space.
