Mercedes GLB 7-seater: third row, boot space and 2026 versions

The Mercedes GLB is a 4.73 m compact SUV that can carry up to seven people. Its new generation, unveiled in December 2025, arrives in 2026 as an electric car and with petrol engines, still with an optional third row.

The seven-seat version is what most people look for first. Here is who the third row is for, how much boot space is left, what separates the electric version from the petrol ones and which GLBs we offer in each country.

Should you choose the GLB with 5 or 7 seats?

The seven-seat version adds two individual seats at the back of the boot. When you do not need them, they fold into the floor and the GLB becomes a five-seater with a large boot again.

• Recommended height in the third row: up to 1.71 m, 3 cm more than in the previous GLB
• Access: the second-row seat slides 32 mm further forward than before, and the rear door openings are larger
• Child seats: up to four in the rear, two in the second row and two in the third, plus one at the front
• Second row: a bench that slides over 14 cm, standard on the seven-seater

These two seats are therefore mainly for children and teenagers, or for adults of average height on a short trip. For a family of five who sometimes take friends or grandparents along, they save taking a second car. If you often travel with seven adults, a larger SUV is a better choice. The rear doors also cover the sills, which keeps clothes clean when climbing into the back.

How big is the boot with 5 and 7 seats?

Mercedes quotes 540 litres of boot space with five seats. With seven seats, 480 litres remain with the third row folded, because the two extra seats are stored under the floor.

• Five seats: 540 litres, up to 1,715 litres with the rear bench folded
• Seven seats, third row folded: 480 litres, up to 1,605 litres with the rear bench folded
• Second-row bench slid forward: up to 140 extra litres
• Electric GLB: 127 more litres under the bonnet

Mercedes does not publish a volume with all seven seats in use. Behind the third row there is room for soft bags or shopping, not for the whole family's suitcases. The second-row backrest folds in three parts (40/20/40), so you can keep two passengers in the back and slide skis through the middle.

Electric or petrol, which GLB should you choose?

We offer three powertrains, all new and already in stock.

• GLB 180: 136 hp petrol engine backed by 30 hp of electric power, front-wheel drive, 0 to 100 km/h in 9.7 s, 194 km/h, 5.9 to 6.1 l per 100 km
• GLB 200: 163 hp petrol engine with the same 30 hp boost, front-wheel drive, 0 to 100 km/h in 8.7 s, 208 km/h, 6.1 l per 100 km
• Electric GLB 250+: 272 hp, rear-wheel drive, 0 to 100 km/h in 7.4 s, 210 km/h, battery with 85 kWh of usable capacity

The GLB 180 and GLB 200 do not plug in. Their 1.5-litre turbocharged four-cylinder engine is assisted by an electric motor powered by a 48-volt battery and housed in the eight-speed automatic gearbox. At gentle speeds in town, they can move without burning petrol, and they recover energy every time you brake.

For the GLB 250+, Mercedes quotes up to 631 km under the WLTP standard. On our cars, our configurator shows 597 to 604 km depending on trim and wheels, for 16.6 to 16.8 kWh per 100 km. In winter or on the motorway, real-world range drops markedly, as with any electric car.

Mercedes also builds the electric GLB with seven seats, but our GLB 250+ cars have five. With us, the third row therefore means a GLB 180 or a GLB 200. The electric version makes sense if charging at home or at your workplace is possible. Petrol is simpler if you cover long distances far from reliable chargers.

How do you charge the electric GLB?

The GLB 250+ is built on an 800-volt architecture. On a suitable rapid charger, it accepts up to 320 kW.

• On a rapid charger: from 10 to 80% in 22 minutes
• In 10 minutes: 225 to 260 km of range added
• At home: 11 kW on alternating current, about 9 hours for a full charge
• Heat pump on all our electric GLBs, to lose less range in cold weather

Plugged into a wallbox in the evening, it is full again in the morning. On the way to your holidays, a break of around twenty minutes at a rapid charger adds several hundred kilometres. With the tow bar, fitted to some of our cars and shown on the car's page, the electric GLB takes 100 kg on the tow ball according to Mercedes, enough for a bike rack loaded with e-bikes.

Which trim should you choose on our GLBs?

Our GLBs come in two trims. Business Line is reserved for the electric version, while AMG Line is available with all three powertrains.

• Business Line: comfort seats, leather steering wheel, ambient lighting, keyless entry and start, wireless phone charging
• AMG Line: AMG exterior styling, nappa leather steering wheel, 19 or 20-inch AMG wheels and, on the GLB 180 and GLB 200, sports seats
• GLB 200: on top of that, MULTIBEAM LED headlights, adjustable damping, Superscreen and an electric driver's seat with memory

On the electric version, most cars also have the Superscreen, memory seats and a sliding rear bench. All our GLBs have the panoramic glass roof, the electric tailgate and the reversing camera.

On the car's page, you set the powertrain, the trim, the body colour, the wheels and then the upholstery one after another. At each step, it only shows the cars available, and those with the third row mention it in their highlights.

How do you get the GLB on subscription with Turismo?

Our GLBs are new and in stock. Allow two to three weeks before you receive yours. In Luxembourg and Belgium, all three powertrains are available, and the seven seats come on the GLB 180 and GLB 200. In France, we currently offer the electric GLB 250+, with five seats.

The GLB is available for 36, 48 or 60 months, with 1,000 or 2,000 km per month. Comprehensive insurance, taxes, the maintenance scheduled by the manufacturer, tyres (all-season, or summer and winter depending on the contract) and roadside assistance are all part of the monthly payment.

Energy, whether petrol or charging, delivery and any kilometres over your allowance remain at your expense.

FAQ: the Mercedes GLB 7-seater

In short

• The GLB carries up to seven people, and its third row suits passengers up to 1.71 m tall.
• Its boot holds 540 litres with five seats and 480 litres with seven seats and the third row folded; the electric version adds 127 litres at the front.
• At Turismo, the seven-seater comes with petrol engines in Luxembourg and Belgium, and the electric version with five seats in all three countries, with two to three weeks' lead time.

On the Mercedes GLB page, choose your version and see the monthly payment that applies in your country.