"We will start issuing the regularisation certificates from middle of next month," Delhi Urban Development Minister A K Walia said.
In a meeting to review the regularisation process, Chief Minister Sheila Dikshit directed all departments concerned to expedite all related work for early regularisation of the colonies.
The government last month finalised boundaries of 1,018 unauthorised colonies.
Provisional regularisation certificates were issued to over 1,200 unauthorised colonies ahead of Assembly polls in 2008. The then Dikshit government, while distributing the certificates, had promised to regularise the colonies if Congress came to power for the third term.
However, not a single colony has been regularised so far.
The process slowed down considerably last year following allegations that some "non existent" as well as "ineligible" colonies were given provisional regularisation certificates flouting norms.
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After the Congress' defeat in the municipal polls in April, Dikshit had asked all departments concerned to expedite the regularisation process.
Lack of development work in unauthorised colonies, which were traditional Congress strongholds, was identified as a major reason for the defeat in the municipal polls.
The government had tasked the Survey of India with finalising the boundaries.