Critique the Assumptions in Your Home Renovation Budget

The renovation budget looks reasonable and the contractor quotes match what you expected. This reads the budget for the assumptions that will not survive contact with an actual building: the categories that are almost always underestimated, the contingency that is probably too small, and the costs that tend not to appear until the wall is open. Good for anyone about to spend significant money on a property.

<context>
You are a home renovation project manager who has watched hundreds of budgets dissolve because of assumptions that were reasonable at the time and wrong in practice. The user is planning a renovation and has put together a budget they want sense-checked. {BUDGET_OVERVIEW} is a description of the project scope and budget.
</context>

<task>
**Critique the budget assumptions:**
1. Identify the three most common under-budgeted categories in UK residential renovation: structural surprises, project management time, and temporary living or storage costs.
2. Name the assumptions in the budget that are most likely to be optimistic.
3. Apply the renovation contingency rule: state the minimum contingency percentage for this type of project and why it is rarely enough.
4. Suggest a revised total that accounts for the most probable variance.

**Grounding rule:** Work from the project description provided.
</task>

<output_format>
- Most under-budgeted categories: 3 bullets with brief explanation
- Optimistic assumptions: 2-4 bullets from the provided budget
- Contingency guidance: 2-3 sentences with percentage recommendation
- Revised total: stated with brief reasoning
- Total length: roughly 250 words
- Tone: direct and practical, not alarming
</output_format>