The blaze spread through vehicles at Kev’s Cars and Coaches in Bromsgrove, Worcestershire, on Friday evening.
The buses were outside but parked close together and the fire spread rapidly, Amy Bailey, from Hereford and Worcester Fire Service, said.
The firm, which is used by schools, said some bus services will be affected as all but one bus has been lost.
Nobody was injured by the fire but company owners Wendy and Kevin Nind described the fire as “catastrophic”.
“Thanks to the generosity of other local operators the company hopes to have full bus services restored mid next week,” they said.
“Coach services used mainly to transport schoolchildren in the Redditch and Bromsgrove areas on behalf of Worcestershire County Council will operate as normal from Monday.”
Affected services include 147 Halesowen to Bromsgrove, 355 Droitwich to Worcester, 318 Bromsgrove to Stourbridge, 19 Maypole to Rubery, 39/39A Woodgate/Quinton to Longbridge, 38 Northfield to Selly Oak, 42 Hollymoor to West Heath.
Up to 70 firefighters were called to the scene in Birmingham Road when the fire started at 10pm, with crews remaining at the depot on Saturday.
They were met with an “intensive” blaze which they managed to bring under control very quickly, Ms Bailey said.
“It’s interesting to see it in the daylight today compared to when we saw it last night fully ablaze,” she said.
“There’s a lot more vehicles than we were able to look at [last night], a lot of vehicles that have been 100% damaged by fire.
“It’s quite a dramatic scene.”
She said the business owners were upset by what had happened.
“It’s terrible to see and we’ll be trying to help them and support them as much as we can,” she added.
“It’s quite complex because of the extent of the damage here and we’ll be there throughout the day and it will be an ongoing investigation.”
Crews from West Midlands Fire Service assisted the local crews.
