This guide explains planning permission rules affecting single storey extension developments in Portsmouth.
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.
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Roof alterations must comply with national permitted development rules.
Plans, drawings and material submitted to us are protected by the Copyright Acts (Section 47, 1988 Act). You may only use material which is downloaded and/or printed for consultation purposes to compare current applications with previous schemes and to check whether developments have been completed in accordance with approved plans. Further copies must not be made without the prior permission of the copyright owner.
Additional planning restrictions may apply in conservation areas.
Listed building consent is required for works affecting listed buildings.
Last verified 2026-01
UK permitted development legislation allows many single storey extension projects without planning permission provided certain limits are followed.
However local planning authorities such as those covering Portsmouth may impose additional planning controls through conservation area policies or Article 4 directions.
Many single storey extension projects in Portsmouth may fall under permitted development rights if they remain within national planning limits.
Development must comply with national permitted development height limits.
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Yes. Additional planning restrictions may apply in conservation areas or where Article 4 directions remove permitted development rights.
Planning applications for single storey extension projects in Portsmouth are handled by the local planning authority covering Portsmouth, 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 single storey extension developments in Portsmouth.
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