An investigation has now been launched into the fire, which is being treated as wilful.
Officers are eager to trace two young boys seen in the lane, at the rear of the properties, before the blaze.
Both boys are described as being about 4ft and of slim build.
One boy was wearing a black tracksuit and the other was wearing a white t-shirt and grey tracksuit bottoms.
Neighbours are being asked to review their CCTV and dashcam footage to help with inquiries.
Anyone with information is asked to contact police on 101, quoting incident 2608 of May 18.
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Police keen to trace two youths seen moments before Inverness wilful fire
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