How the 2027 GLB Compares to the 2025 Model: Key Changes Explained

The Mercedes-Benz GLB has earned its reputation as a versatile compact SUV that maximizes interior space without sacrificing style. With the arrival of the all-new 2027 GLB, Mercedes-Benz has reimagined this practical family hauler from the ground up. The transformation is substantial - moving from a turbocharged gasoline powertrain to a fully electric platform while maintaining the GLB's signature spaciousness and flexibility.

For drivers in Quebec considering an upgrade or exploring their options, understanding the differences between these two generations helps clarify what this evolution means for daily driving, family needs, and long-term ownership. Here's how the 2027 GLB compares to its 2025 predecessor across the dimensions that matter most.

Powertrain: From Turbo-Hybrid to Fully Electric

The 2025 GLB 250 4MATIC relied on a 2.0-litre inline-4 turbocharged engine paired with a 48-volt mild hybrid system. This setup delivered 221 horsepower at 5,500 rpm and 258 lb-ft of torque between 1,800 and 4,000 rpm, with an additional 13 horsepower available from the electric boost. 

Power reached all four wheels through an 8-speed dual-clutch automatic transmission and Mercedes-Benz's 4MATIC all-wheel drive system, achieving 0-100 km/h in 7.0 seconds.

The 2027 GLB marks a complete departure from internal combustion. As a fully electric vehicle, it eliminates the gasoline engine, transmission, and traditional drivetrain components entirely. The shift to electric power fundamentally changes the driving character - instant torque delivery, silent operation, and the convenience of home charging replace fuel stations and oil changes.

Dimensions: Larger Footprint, More Interior Space

Mercedes-Benz stretched the 2027 GLB's proportions to accommodate the electric platform and enhance interior volume. The new model measures 4,732 mm in length - 98 mm longer than the 2025 GLB's 4,634 mm. Width remains identical at 1,861 mm, while height drops slightly from 1,701 mm to 1,687 mm. 

The wheelbase grows by 60 mm to 2,889 mm, a change that directly translates to more cabin space.

Front legroom increases by 7 mm to 1,052 mm in the 2027 model. Second-row legroom sees a more substantial gain of 68 mm when measured at maximum adjustment, reaching 1,008 mm (compared to 940 mm in the 2025 GLB). Maximum front headroom rises by 35 mm to 1,070 mm. 

These dimensional improvements enhance comfort for taller passengers and create a more spacious feel throughout the cabin. The turning circle expands slightly from 11.7 metres to 11.9 metres - a modest trade-off for the increased size that remains manageable in urban parking situations.

Design Philosophy: Striking vs Rugged

The 2025 GLB embraced a rugged aesthetic often described as a "mini-G-wagon" look. Its upright body, squared-off proportions, and commanding stance emphasized utility and capability. Design elements prioritized maximizing interior volume within a compact footprint, with available AMG Line and Night packages adding sportier visual touches.

The 2027 GLB introduces what Mercedes-Benz describes as a "striking design" that maintains everyday practicality. The shift to an electric platform allows designers more freedom with proportions, grille treatments, and aerodynamic elements. The longer wheelbase and slightly lower roofline create a more streamlined profile compared to the boxier 2025 model.

Seating and Versatility: Maintaining Family-Friendly Flexibility

One of the 2025 GLB's standout features was optional 7-passenger seating - rare in the compact luxury SUV segment. The second row offered sliding and reclining adjustments, while the optional EASY-ENTRY third row provided genuine utility for shorter trips or smaller passengers. With rear seats folded, cargo capacity reached up to 1,680 litres.

The 2027 GLB's increased second-row legroom (68 mm more at maximum adjustment) enhances comfort in the 5-passenger configuration. The longer wheelbase and revised packaging create opportunities for enhanced cargo volume, making the new generation even more practical for families and active lifestyles.

Technology and Features: Evolution in Connectivity

The 2025 GLB featured dual 10.25-inch digital displays for instrumentation and infotainment, wireless Apple CarPlay and Android Auto, wireless charging, and Mercedes me connect services. Standard driver assistance technologies included Blind Spot Assist, Exit Warning Assist, and Hands-Free Parking, with adaptive cruise control (DISTRONIC) available as an option. 

The MBUX infotainment system responded to "Hey Mercedes" voice commands, and 64-colour ambient lighting added customizable atmosphere.

The transition to an electric platform in the 2027 GLB brings updated infotainment systems, enhanced connectivity features, and EV-specific functions such as charging station locators, range optimization tools, and battery preconditioning controls. These additions make electric vehicle ownership more intuitive and convenient.

Driving Dynamics: AWD Capability vs Electric Performance

The 2025 GLB's 4MATIC all-wheel drive system distributed torque variably between front and rear axles based on driving conditions. DYNAMIC SELECT drive modes allowed drivers to adjust throttle response, transmission behaviour, and steering feel. Available adaptive suspension enhanced ride quality, while specialized off-road engineering included Downhill Speed Regulation and dedicated off-road graphics.

Electric vehicles handle traction and torque delivery differently than gasoline-powered models. The 2027 GLB offers instant torque, precise power distribution, and a lower centre of gravity due to floor-mounted battery packs. These characteristics translate to confident acceleration and stable handling, with a driving character distinct from turbocharged gasoline engines.

Ownership Considerations: Fuel vs Charging

Operating a 2025 GLB meant regular fuel stops, oil changes, transmission servicing, and traditional maintenance schedules. The mild hybrid system improved efficiency but did not eliminate reliance on gasoline.

The 2027 GLB requires adapting to electric vehicle ownership patterns - home charging installation, public charging network familiarity, and planning longer trips around charging stops. Maintenance requirements shift away from engine oil and transmission fluid toward tire rotations, brake inspections (though regenerative braking reduces brake wear), and battery health monitoring.

What This Evolution Means for Buyers

The transition from 2025 to 2027 goes beyond a typical model refresh. Mercedes-Benz has repositioned the GLB as an electric vehicle, fundamentally changing how owners interact with the vehicle daily. 

The 2025 GLB served families seeking maximum interior flexibility in a compact package with conventional powertrain familiarity. The 2027 GLB targets buyers ready to embrace electric driving while maintaining the spaciousness and versatility that defined the nameplate. 

The increased interior dimensions address one of the most common requests from 2025 GLB owners - more second-row legroom - while the electric powertrain eliminates fuel costs and reduces long-term maintenance expenses.

Explore the 2027 GLB at Mercedes-Benz Laval

The 2027 GLB embodies Mercedes-Benz's vision for the future of compact luxury SUVs - combining the practicality families need with the technology drivers increasingly expect. Visit Mercedes-Benz Laval to learn more about this next-generation compact SUV and discover how the electric transformation enhances your daily driving experience.