The measures have been temporary since 2014, during which over 110,000 extensions have been completed.
Under the rules, homeowners can put a single-storey rear extension on their property of up to six metres for terraced or semi-detached homes, or eight metres for detached homes.
In addition, restrictive planning rules have also been axed, which will ensure business owners can respond quickly to changing trends on the high street.
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Housing Minister Kit Malthouse MP said: "These measures will help families extend their properties without battling through time-consuming red tape.
"By making this permitted development right permanent, it will mean families can grow without being forced to move.
"This is part of a package of reforms to build more, better, faster and make the housing market work - and sits alongside our drive to deliver 300,000 homes a year by the mid 2020s."
As part of the reforms, permitted development rights will also give business owners on the high street greater flexibility as they respond to changing trends in customer spending.
Shops will now be able to change to office space without the need for a full planning application.
(CM/MH)
