The first Certificate confirms the lawful use of two bays of one of the structures at the site for unrestricted A1 retail sales in breach of a condition.
The Pet Department is located within part of the building previously only permitted for storage use.
The second Certificate confirmed the lawfulness of use of part of the building for an independent accountancy office.
The Council had threatened to enforce against Knights Garden Centre in regard to both matters after a previous application for a Certificate of Lawfulness for the office was turned down.
Malcolm Scott Consultants were subsequently instructed in the matter to seek a way forward.
Knight's Duncan Knight said "Thanks for your help on both these issues.
"It was a big relief to receive the result we were after without the stress of dealing with the planners ourselves."