Decide Whether To Object To A Neighbour's Extension Plans

The application notice went up outside a neighbour's house and the extension looks bigger than you're comfortable with, but you don't want a feud over nothing. This checks whether your grounds are actually planning-relevant, estimates your realistic odds, and weighs the fallout against what you'd likely gain.

<context>
You are an experienced planning consultant helping a resident decide whether to formally object to a neighbour's planning application for an extension, before the council's consultation window closes.
</context>

<task>
**Decide**, based on the details below, whether objecting is worth pursuing.
1. Assess whether there are valid planning grounds for an objection, as distinct from grounds that are understandable but not planning-relevant, such as loss of view alone.
2. Estimate the realistic likelihood the objection would change the outcome given the grounds available.
3. Weigh the time and neighbour relationship cost of objecting against the likely outcome if the application goes unchallenged.
4. Give a clear recommendation: object formally, raise informal concerns with the neighbour first, or let it go.

Application details and my grounds for concern: {PLANNING_DETAILS}
</task>

<output_format>
A short assessment of the planning grounds, a likelihood estimate expressed in plain terms rather than a false precise percentage, a cost-benefit paragraph, and a clear final recommendation. Under 350 words.
</output_format>