Rear extension (single storey)

We have assessed 4 common project types for your property at 14 Rosewood Terrace. The results show that 3 out of 4 project types can proceed as Permitted Development without needing planning permission, provided they meet the GPDO conditions and dimensional limits.

The property benefits from having no significant planning constraints — it is not in a Conservation Area, not a Listed Building, and is in Flood Zone 1. The one area requiring attention is the TPO-protected oak tree in the rear garden, which may affect the positioning of rear extensions and outbuildings.

Click on each project type below to see the full assessment, including key limits, conditions, and recommended next steps.

Recommended Next Steps

• For your rear extension: Apply for a Lawful Development Certificate (LDC) to formally confirm your PD rights before starting work. This provides legal certainty and is important for future property sales.
• Commission an arboricultural assessment: Given the TPO tree, get a qualified arboriculturist to assess the root protection area before finalising your design.
• Consider materials early: PD conditions require materials to be similar in appearance to the existing dwelling. Discuss material choices with your builder or architect at the design stage.

Planning History Assessment

The planning record at 14 Rosewood Terrace is clean and constructive. With three prior applications and no refusals or enforcement actions, the property has a positive track record with the London Borough of Merton’s planning department.

The 2015 approval for a side extension is the most relevant precedent. The 2018 lawful development certificate for a loft conversion confirms the property’s PD status. The 2023 withdrawn application does not raise concerns — applications are withdrawn for many reasons.

Nearby Comparable Applications

We identified 5 comparable applications for single storey rear extensions within 500 metres, with 4 out of 5 approved (80% approval rate). The approval at 8 Rosewood Terrace (45m away) is a strong direct comparable — a 4m deep extension was approved under delegated authority in June 2024.