Here are a few options you could consider, depending on the context:
General terms:
* Group of bungalows
* Cluster of bungalows
* Row of bungalows (if they are in a line)
* Neighborhood of bungalows (if they are in a specific area)
More whimsical options:
* Snuggle of bungalows
* Haven of bungalows
* Nest of bungalows
Ultimately, the best collective noun will depend on the specific context of your writing.