Smart home device maker Nest Labs, backed by Google Ventures, is reported to be raising at least $150m, led by DST Global.

Nest Labs, a US-based maker of smart home devices including thermostats and smoke/carbon monoxide alarms, is reported in Re/code and other sources to be raising between $150m and $200m funding at a valuation of over $2bn, led by venture capital firm DST Global and including Google Ventures, the corporate venturing arm of internet search firm Google, amongst its follow-on investors.

Previously, in January 2013, Nest Labs reportedly raised $80m from a consortium led by Google Ventures at an $800m valuation;…