Emergency services were called to the Co-op in New Road, in Croxley Green, at 5.06am.
There was a small fire at the rear of the vehicle, which was extinguished by the fire service.
No-one was injured during the incident.
Anyone with information is asked to contact Three Rivers Local Crime Unit via the non-emergency number 101, quoting crime reference C2/17/3783
A 34 year old man, of no fixed address, was arrested by officers shortly afterwards on suspicion of arson.
He remains in police custody at this time.
At around 2.30am on Friday, December 8 , an accelerant was used to set the shop front alight.
The shop sustained damage to the doors, windows and the flooring inside.
Detective Constable Steve Mason said: “This was an extremely dangerous act which could have caused serious injury. I am appealing for anyone who saw what happened, or who thinks they may know the identities of those responsible, to please get in touch.”
05:09 - Control mobilised @A07Fire to a vehicle in collision with a building on New Road, Croxley Green. A hosereel was used to extinguish the smoking vehicle and crew made safe.— Herts Fire Control (@HertsFRSControl) December 10, 2017
Anyone with information is asked to contact Three Rivers Local Crime Unit via the non-emergency number 101, quoting crime reference C2/17/3764
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