Planning Permission and Permitted Development
Home alteration rules in most jurisdictions allow a range of works without a formal application, subject to conditions that are easy to breach unknowingly.
The general structure
Certain works are permitted automatically within defined limits of size, height, position and materials.
Anything outside those limits requires an application.
Separately, building regulations apply to structural, thermal, drainage, fire and electrical aspects regardless of whether planning permission is needed. These are different systems and satisfying one does not satisfy the other.
Where the rights are removed
Listed buildings and conservation areas, where far more requires consent, including some changes that are otherwise unremarkable.
Flats and maisonettes, which generally have no such rights at all.
Properties where the rights were removed by condition on the original permission, which is common on newer estates and frequently unknown to owners.
Areas designated for landscape or environmental protection.
Check the property's planning history before assuming rights exist.
Common works and their status
Internal alterations generally need no planning permission but frequently need building regulations approval, particularly where walls are removed or layouts change.
Extensions are permitted within size and height limits that differ by property type and location.
Outbuildings are permitted within limits, with restrictions on height, proximity to boundaries and use as living accommodation.
Roof alterations, including dormers, have specific volume limits and restrictions at the front of the property.
Fences, gates and walls have height limits, lower where adjoining a highway.
Getting certainty
A lawful development certificate confirms formally that works are permitted. It costs a fee and provides documentary proof, which matters when selling.
Local authority pre-application advice is available in many areas for a modest charge and prevents wasted applications.
The consequences of getting it wrong
Enforcement action can require removal of the works.
Unauthorised works surface during conveyancing and can delay or collapse a sale.
Indemnity insurance is sometimes used to address historic breaches and is not available once the authority has been contacted about them.
General information; rules vary by jurisdiction. Check with your local authority.
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