The foundation of Punjab State historically referred to the Sikh Empire or Lahore Darbar because it is linked with unification of Sikh Mislslocated in the territories of Punjab during 1795-1808. This region was unified by Ranjit Singh after annexation of all misls and extended towards north and west. From Peshawar to Tibet and Sindh to Xinjiang, the Empire of Gulab Singh was extended in the light of Treaty of Amritsar of 1809 (Treaty of Friendship & Peace) between East India Company and Maharaja Ranjit Singh. This Treaty was a certificate by British Government of India to Maharaja Ranjit Singh to extend towards north and northern south from Tibet towards Kabul and Gilgit. The Imperial Rule forfeited the claim to the Cis-Sutlej State and Company ensured not to interfere in northern extension of Lahore Darbar. This study is analytical approach towards the exploration of British ambitions in expansion and annexation of Sikh or Punjab Empire. The strategic interests of British Indian Empire as securing the Imperial rule, British Policy towards north against Russia and the contribution or Ranjit Singh are the prime themes of this study. This study also aimed to explore the role of Gulab Singh in annexation of Lahore Darbar to British Imperial rule that how he assisted British in grabbing the Punjab and British assisted him in foundation of Dogra Rule in Kashmir.