Gurdwara Sri Kotha Sahib marks the site where Mai Haro lived in a kacha (mud) house and where Guru Tegh Bahadur stayed for 17 days.

When the Sangat of Amritsar heard how the masands had treated Guru Tegh Bahadur, they felt distressed. On behalf of the Sangat, a group of ladies came to Vallah to atone for what the masands had done. Guru Tegh Bahadur blessed them saying, 'Maiari rabb Rajaian' (Upon women may rest God's favour)."

The Sangat from Amritsar pleaded with Guru Ji to go back with them and run Sri Harmandir Sahib. But Guru Tegh Bahadur refused to adopt the behaviour of the masands and turn religion into a business.

The present building was built after the old one was badly damaged by an earthquake in 1905. The Gurdwara comprises of a hall with a square sanctum in the middle of it. There is a domed room above the sanctum and residential accommodation to the right of the central building as one enters. Guru ka Langar is at the back.

Three and half acres of land is named to be the property of the Gurdwara with some property that was acquired by the Punjab Government for the construction of the live-stock market and the Focal Point. The Gurdwara is managed by the Shiromani Gurdwara Parbandhak Committee through a local committee. A largely attended fair is held on the full moon day of the month of Magh (mid-January to mid-February).