When you need planning permission in Kingston upon Thames

Most single-storey rear extensions in Kingston upon Thames fall under Permitted Development (PD), provided they stay within size, height and material limits. Two-storey extensions, side-return extensions on terraces, and any work in a conservation area or to a listed building typically require a full planning application from your local authority in Greater London.

Permitted Development limits used in Kingston upon Thames

For detached homes, rear extensions can usually go up to 8 m deep (single-storey) without planning. For terraced and semi-detached, the limit is 6 m. Maximum eaves height is 3 m within 2 m of the boundary, and side extensions must be single-storey, no more than 4 m high, and no wider than half the original house. Always file a Prior Approval / Lawful Development Certificate to lock the rights in writing.

Conservation areas and listed buildings

Kingston upon Thames has several conservation areas where Permitted Development rights are restricted or removed entirely (Article 4 directions). Listed buildings always require Listed Building Consent in addition to planning. Check the local authority's planning portal before quoting builders.

Typical timelines & fees

A householder planning application takes 8 weeks for a decision. Fees are £258 for England householder applications (2026). Lawful Development Certificates cost £129. Budget 4–6 weeks extra for drawings and pre-application advice if needed.