Discuss a proposal they can understand
Use the proposed plans and elevations to explain what will change, rather than asking a neighbour to approve a vague idea such as “a small extension”. Point out the boundary position, height, windows and any accessible roof space where these are part of the design. Planning Portal recommends discussing proposals beforehand to help identify and resolve objections. [1]
Label the drawing revision and explain whether it is an initial option or the version intended for submission. A practical aim is to discover factual issues: for example, whether a window shown as serving a store actually serves an occupied room. Those facts can matter when effects on neighbouring amenity are assessed. [3][4]
Ask about effects rather than requesting a blanket signature
Invite the neighbour to identify the part of the proposal that concerns them and where the effect would be experienced. Daylight, privacy and outlook are different matters and may need different design responses. In London, adopted design policies address appropriate outlook, privacy and amenity. [3]
A useful working record is a dated note of the concern, the relevant drawing and the response proposed by the designer. This is a communication tool, not a statutory agreement. It helps keep later discussions tied to the actual proposal rather than differing recollections. [1]
Avoid promising that the council will approve a particular amendment. Planning decisions are made against the development plan and other material considerations, not simply by agreement between the two households. [5]
Keep planning and property rights separate
Neighbour support does not replace an application where permission is required. Equally, a neighbour who raises concerns does not automatically have a right to veto an otherwise acceptable planning application. The council assesses relevant planning issues. [1][5]
If the work needs party wall notices, serve the correct documents through the statutory process. If scaffolding or construction access needs a separate agreement, discuss that as a separate issue. A positive reaction to a drawing is not necessarily consent to enter land or construct a wall across the boundary. [6][7][2]
Explain what happens next
Tell the neighbour how to identify the submitted application, making clear that they can give their own comments to the council. Formal publicity and the opportunity to make representations remain part of the planning process. [8][9]
Do not ask a neighbour to give up commenting in exchange for seeing the design early. The value of the discussion is better information and an opportunity to address concerns, not the removal of their independent route to the council. [8]
For London projects, distinguish adopted policies from the draft London Plan 2026, whose consultation closes on 15 October 2026. A draft proposal is not an already adopted permission standard, and it should not be used to promise an outcome to either household. [10]