Alexander Dennis Large Buses & Double-Deckers
Alexander Dennis Large Buses & Double-Deckers
Alexander Dennis Enviro400
The diesel-powered Enviro400 remains one of Britain's most successful double-deck buses, combining high passenger capacity with proven commercial-vehicle engineering. Available in three body lengths, it accommodates up to 85 seated passengers in its longest configuration, making it particularly suitable for busy bus routes, schools, events and private hire. Its 6.7-litre Cummins diesel engine is paired with an automatic transmission and Alexander Dennis SmartPack efficiency technology, reducing fuel consumption and emissions. Operators can choose conventional or City-style bodywork, alongside features such as high-backed seating, seatbelts, USB charging and enhanced interior finishes. Despite the growth of electric buses, the Enviro400 continues to attract new orders from British operators in 2026.
Price From: POA / specification dependent
Manufacturer: Alexander Dennis
Powertrain: Diesel
Engine: 6.7-litre Cummins B6.7 Euro VI six-cylinder diesel
Power: 187kW / approximately 251bhp
Torque: 1,000Nm
Transmission: Voith DIWA automatic with SmartPack efficiency technology
Seats: Up to 74 (10.5m), 82 (10.9m) or 85 (11.5m)
Typical Licence: Category D
Drive: Rear-wheel drive
Body Lengths: 10,500 / 10,900 / 11,500mm
Width: 2,550mm
Height: 4,200 / 4,300mm, specification dependent
Gross Vehicle Weight: 18,000kg
Doors: Single- or dual-door configurations available
Accessibility: Low-floor entrance with wheelchair ramp and one or two wheelchair positions
Passenger Equipment: Optional seatbelts, high-backed seating, air conditioning, USB charging, Wi-Fi and passenger information systems
UK Availability: Current factory-new model
Alexander Dennis Enviro400EV
The next-generation Enviro400EV represents a substantial advance over Alexander Dennis's earlier electric double-deckers. Developed around a dedicated electric drivetrain and modern battery technology, it combines seating for up to 80 passengers with exceptionally low energy consumption. Its 472kWh battery provides a theoretical range of up to 385 miles under the UK Bus Cycle, although real-world operating distances will vary considerably. A powerful 410kW peak-output motor delivers smooth performance, while regenerative braking and an efficient heat-pump climate system help reduce energy consumption. A shorter London-specific version offers 62 seats, with an accessible centre-door entrance. Already operating with British transport companies, the Enviro400EV is one of the manufacturer's most important current models.
Price From: POA / specification dependent
Manufacturer: Alexander Dennis
Powertrain: Electric
Motor: Driventic heavy-duty Vehicle Electrical Drive System (VEDS HD)
Power: 310kW continuous / 410kW peak
Battery: 472kWh NMC lithium-ion / optional 354kWh battery
Range: Up to 385 miles theoretical UK Bus Cycle range with 472kWh battery at beginning of life
Charging: CCS2 DC charging, with optional roof-mounted pantograph charging rails
Seats: Up to 80 passengers / 62 seats in London specification
Total Passenger Capacity: Up to 96 including standing passengers, depending on specification
Typical Licence: Category D
Drive: Electric rear-wheel drive
Length: 11,100mm / 10,500mm London specification
Width: 2,550mm
Height: 4,200 / 4,300mm, specification dependent
Gross Vehicle Weight: 19,500kg
Climate System: Air conditioning with zero-emission heat pump
Accessibility: Low-floor passenger accommodation with wheelchair spaces and ramp access
Passenger Equipment: Configurable seating, USB charging, passenger information systems and modern safety technology
UK Availability: Current factory-new model, including London specification
Alexander Dennis Enviro400XLB
The Enviro400XLB takes the familiar double-decker formula to a considerably larger scale, using a three-axle Volvo B8L chassis to provide exceptional passenger capacity. Earlier 13.4-metre examples accommodated up to 100 seated passengers, making them particularly useful for busy interurban routes, guided busways and airport services. The model has received renewed investment in 2026, with Lothian ordering 60 new buses featuring a shorter 12.8-metre body and improved accessible passenger accommodation. Their extended lower decks provide additional space for wheelchairs, pushchairs and priority seating. With robust Volvo mechanicals and a wide selection of interior equipment, the Enviro400XLB offers a compelling alternative to operating multiple smaller buses on heavily used routes.
Price From: POA / contract and specification dependent
Body Manufacturer: Alexander Dennis
Base Chassis: Volvo B8L 6x2
Powertrain: Diesel
Engine: Volvo D8K 7.7-litre Euro VI six-cylinder diesel, published XLB specification
Power: 258kW / approximately 346bhp, published XLB specification
Torque: 1,400Nm, published XLB specification
Transmission: ZF EcoLife automatic, published XLB specification
Seats: Up to 100 passengers in 13.4m configuration; 2026 12.8m seating specification TBC
Typical Licence: Category D
Drive: Rear-wheel drive, three-axle 6x2 chassis
Length: 12,800mm (2026 Lothian version) / 13,400mm (established specification)
Width: 2,550mm
Height: Approximately 4,300mm, specification dependent
Axles: Three, including rear tag axle
Accessibility: Low-floor entrance with wheelchair ramp; 2026 design provides two wheelchair/buggy spaces
Passenger Equipment: Configurable seating, USB charging, passenger information systems and optional luggage accommodation
UK Availability: New UK orders confirmed in 2026; typically built to operator
specification
Important Information
Prices, specifications, dimensions, seating capacities, weights, power outputs and equipment are based primarily on information published by vehicle manufacturers and their official UK representatives. Specifications can vary by body length, chassis, model year, interior layout and individual operator requirements.
Prices shown are UK prices where available and are intended as a guide. Where an official UK list price is unavailable, pricing is shown as POA. Prices can vary substantially according to contract size, optional equipment, accessibility requirements and operator-specific conversions.
Passenger seating capacity and total passenger capacity are different measurements. Some buses accommodate additional standing passengers, while wheelchair spaces, seating arrangements and accessibility equipment can affect total capacity. The Enviro400XLB's 100-seat specification relates to the established 13.4-metre version; final seating details for the newly ordered 12.8-metre version may differ.
Licence categories shown are a general guide only. Individual driving entitlement can vary according to passenger-seat count, vehicle weight, vehicle length, licence issue date, grandfather rights, Section 19 operation and other exemptions. Passenger-seat counts used for licence purposes exclude the driver. Always check the vehicle's plated specification and your own driving-licence entitlement before driving.
Electric driving ranges are manufacturer claims based on stated testing conditions. The Enviro400EV's maximum theoretical range is calculated using the UK Bus Cycle and should not be directly compared with passenger-car WLTP figures. Real-world range will vary according to passenger load, operating speed, temperature, heating, route characteristics and battery condition.
Specifications are checked against the latest information reasonably available to The New Yardstick at the time of publication or update. Manufacturers may alter specifications, pricing or availability without notice. Figures for older Enviro400XLB specifications should not be assumed to apply unchanged to newly ordered vehicles.
Image Credits: Vehicle and product photography remains the property of Alexander Dennis, Volvo Buses or the respective copyright holder unless otherwise stated. Images are used for editorial and informational purposes.