This guide explains planning permission rules affecting annexe developments in Hart.
Most householder development follows national permitted development rules unless local restrictions apply.
Development must comply with national permitted development height limits.
Extensions must comply with national permitted development depth limits.
Information about planning applications, building control, the local plan, neighbourhood planning and more
Roof alterations must comply with national permitted development rules.
Materials should be similar in appearance to the existing house.
Find out more about conservation in Hart and how we protect our heritage, including listed buildings and conservation areas
Find out more about conservation in Hart and how we protect our heritage, including listed buildings and conservation areas
Last verified 2026-01
UK permitted development legislation allows many annexe projects without planning permission provided certain limits are followed.
However local planning authorities such as those covering Hart may impose additional planning controls through conservation area policies or Article 4 directions.
Many annexe projects in Hart may fall under permitted development rights if they remain within national planning limits.
Development must comply with national permitted development height limits.
Information about planning applications, building control, the local plan, neighbourhood planning and more
Yes. Additional planning restrictions may apply in conservation areas or where Article 4 directions remove permitted development rights.
Planning applications for annexe projects in Hart are handled by the local planning authority covering Hart, Hampshire.
For official planning advice consult the council planning portal for your area or visit the UK Planning Portal.
This guide summarises planning rules affecting annexe developments in Hart.
Planning regulations may change and additional local planning policies may apply. Always confirm planning requirements with your local planning authority before starting development.
Last updated March 2026