Construction firm Kier has started work on a new 54,754 sq ft HQ and separate 4,718 sq ft facilities building for Scania in Milton Keynes.
Scania will remain on its existing site, where it has been based for 36 years.
The current site houses a t-shaped office and car park. Kier is building the new building alongside, due to complete next summer.
When complete, Kier will demolish the existing buildings.
The new HQ will be a steel-framed structure with composite metal deck upper floor and roof. Internally, the building is mostly open plan, with dedicated meeting and conference rooms, and the three-storey open atrium with a feature staircase.
Scania employs 230 people in Milton Keynes and is as a key employer for the town.
Maintaining its staff is one of the main reasons the company wanted to remain in Milton Keynes and redevelop its space instead of relocating.
Scania (Great Britain) MD Claes Jacobsson says: “This development reconfirms our commitment to both our industry and the area in which we are based.
“The premises are being constructed to an extremely high environmental standard, and will serve us for many years.”