A loft conversion for your house if considered to be permitted development, not requiring an application for planning permission, provided certain limits and conditions are met.
There is a guide available on the Planning Portal website; this guide offers a visual walk-through of those limits and conditions.
http://www.planningportal.gov.uk/permission/commonprojects/loftconversion/miniguide
IMPORTANT NOTE: the permitted development allowances described there apply to houses, not flats, maisonettes or other buildings.
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