Chibuzor Chilaka's first-half strike secured Braintree's win at fellow Blue Square Bet Premier new boys Alfreton.
Chilaka slotted home from inside the area with a neat finish after good work by Ben Wright on the left-hand side.
Alfreton pressed for an equaliser after the break but Theo Streete and substitute Nathan Jarman were both denied by keeper Nathan McDonald.
Jai Reason went close to doubling the lead when his shot hit an upright.
Alfreton Town: Lowson, Law, Young, Franks, Brown, Mullan (Brogan 54), Streete, Holdsworth, Mackin, Clayton (Jarman 69), Senior (Ellison 62).
Subs Not Used: Franklin, Matt Wilson.
Booked: Holdsworth, Young, Clayton.
Braintree Town: McDonald, Peters, Paine, Bailey-Dennis, Thomas, Yiadom (Quinton 90), Davis, Symons, Reason (McLeod 75), Wright (James-Lewis 90), Chilaka.
Subs Not Used: Pooley, Ashlee Jones.
Booked: Davis, Wright.
Goals: Chilaka 18.
Ref: Robert Merchant (Staffordshire).