A planning objection letter is a formal representation submitted to a local planning authority (LPA) setting out your concerns about a proposed development in your area. Planning authorities are legally required to take all valid representations into account before determining an application. A well-argued objection based on planning policy grounds carries significantly more weight than a general expression of concern.

Valid grounds must relate to material planning considerations — things the planning system is designed to assess. These include impact on the character and appearance of the area, loss of light or overlooking affecting neighbouring properties, highway safety and traffic concerns, drainage and flood risk, impact on protected trees or ecology, and conflict with the local plan or National Planning Policy Framework (NPPF). Personal objections — such as a neighbour's character or the effect on your property's value — are not valid planning grounds.

Planning applications are publicly available on your local council's planning portal. You can usually submit representations online, by email, or by post. There is a statutory consultation period during which objections must be received — typically 21 days from the date the application was validated. LetterDeck helps you write your letter; you then submit it directly via your council's planning portal.

A single objection rarely stops a development outright, but multiple well-argued objections can influence the decision, lead to conditions being attached to any approval, or prompt the applicant to amend their plans. If an application is approved against significant local opposition, objectors can ask their local councillor to call the application to a planning committee for a public hearing.