A consultation paper issued this week proposes conditions to minimise impact on neighbours.
They would also take account of flood prevention by requiring the use of porous asphalt or permeable concrete block paving for hard surfaces or making provision for water to drain naturally.
Environment minister Jane Davidson said: "Our proposals are detailed and include a guidance document to make it easier for people to understand the changes they can make without needing planning permission.
"We think that we have struck the right balance in helping local planning authorities redirect their resources by taking some of the small planning applications out of the system while safeguarding the impact on neighbours."
The consultation runs until 15 February.
Proposed Changes to Householder Permitted Development Rights is available at PlanningResource.co.uk/doc