This guide explains conservation areas affecting single storey extension projects in Hounslow, Greater London.
| Maximum Height | 4m pitched roof / 3m flat roof |
| Eaves Height | Maximum 2.5m |
| Boundary Rule | 2m distance required for full height |
| Coverage Limit | 50% of total land around house |
Understanding conservation areas is important when planning a single storey extension project in Hounslow. National planning rules set limits on size, height and location of developments that may be built under permitted development rights.
Local planning policies, conservation areas and Article 4 directions may also affect whether planning permission is required.
Many developments fall under permitted development rights.
Yes, Article 4 directions can remove permitted development rights.
Yes, additional planning restrictions may apply.
Last updated March 2026