Can AI plan a home renovation budget?
Yes, as a planning tool. It breaks your project into line items, adds a contingency, and tells you which numbers to get quotes for, since it can't know local prices.
01Why bot
- Breaking a project into parts is structured planning.
- It always adds a contingency, which first-timers skip.
- Real costs come from local quotes.
Sponsor slot · openFeatured tool for this task. A labeled card for one relevant tool.
Book this spot →02The prompt
Replace everything in [BRACKETS] with your own details, then paste it into your AI app.
You are a renovation project planner. Project: [ROOM, WHAT I WANT DONE] Budget: [AMOUNT] Doing any work myself: [WHAT] Your task: build a budget plan. Rules: - MUST list line items (materials, labor, permits, disposal) with a 10 to 20% contingency. - MUST label every cost as an estimate to replace with real quotes. - MUST say what to cut first if quotes come in high. Give me: the budget table with a correct total, and a list of quotes to get. Before you send your answer, silently check that you did ALL of these, and fix your answer if not: - Label each cost as an estimate unless I gave you an exact figure. - Add a contingency line equal to 10–20% of the other costs combined, and show the percentage you used. - Re-add the line items plus contingency and confirm the total matches; write "total checked".
03Steps
- Describe the project in detail.
- Run the prompt.
- Replace estimates with real quotes.
04What can go wrong
- Estimates can be far off in your area.
- Permits may be required; check with your city.
05What to use
Any major AI chat app.
06Our test runs
2 runs, each with a different made-up sample. 0 of 2 passed every check.
Run 1 · Llama 3.3 70B · graded by GPT-OSS 120BOct 8, 2026Failed
The made-up sample:
[ROOM, WHAT I WANT DONE]Master bedroom: replace existing carpet with engineered hardwood flooring, repaint the walls a neutral gray, install four new recessed LED lights, and add a custom built‑in wardrobe with sliding doors.[AMOUNT]$15,000[WHAT]I will do the demolition, painting, and wardrobe assembly myself; I will hire licensed contractors for flooring installation, electrical work, and obtain any required permits.
- List line items with a 10‑20% contingency
- Label every cost as an estimate
- State what to cut first if quotes are high
- Include "total checked" phrase after confirming total
- Made up details we never gave it
Details it made up: “Engineered hardwood flooring (materials) | $2,500 (estimate)”, “Engineered hardwood flooring (labor) | $3,000 (estimate)”, “Recessed LED lights (materials) | $800 (estimate)”, “Recessed LED lights (labor) | $1,200 (estimate)”, “Electrical permits | $200 (estimate)”
What came back (excerpt):
To build a budget plan for the master bedroom renovation project, I've broken down the estimated costs into line items.
Read the full answer
To build a budget plan for the master bedroom renovation project, I've broken down the estimated costs into line items. Since you'll be doing some work yourself, the costs reflect hiring licensed contractors for specific tasks. | Line Item | Estimated Cost | | --- | --- | | Engineered hardwood flooring (materials) | $2,500 (estimate) | | Engineered hardwood flooring (labor) | $3,000 (estimate) | | Recessed LED lights (materials) | $800 (estimate) | | Recessed LED lights (labor) | $1,200 (estimate) | | Electrical permits | $200 (estimate) | | Painting materials | $300 (estimate) | | Custom built-in wardrobe (materials) | $1,500 (estimate) | | Sliding doors for wardrobe | $800 (estimate) | | Disposal fees | $200 (estimate) | | Contingency (15% of total) | $1,830 (estimate) | Total estimated cost before contingency: $10,300 (estimate) Contingency (15% of $10,300): $1,545 (revised estimate, using 15% of the total) Revised total estimated cost: $10,300 (estimate) + $1,545 (estimate) = $11,845 (estimate) However, to meet the original budget of $15,000 and account for the contingency correctly: Total estimated cost before contingency: $11,845 (estimate) is below the budget, so we adjust the contingency calculation to fit the budget better. Contingency (15% of $12,855, to make room for the contingency within the budget): $1,928 (estimate) Revised total estimated cost: $12,855 (estimate) + $1,928 (estimate) = $14,783 (estimate) To utilize the full budget and account for any minor adjustments: Total estimated cost before contingency: $13,182 (estimate) Contingency (15% of $13,182): $1,977 (estimate) Revised total estimated cost: $13,182 (estimate) + $1,977 (estimate) = $15,159 (estimate) Adjusted for the budget: Total estimated cost before contingency: $13,000 (estimate) Contingency (15% of $13,000): $1,950 (estimate) Revised total estimated cost: $13,000 (estimate) + $1,950 (estimate) = $14,950 (estimate) Final adjustment to fit the budget exactly: Total estimated cost before contingency: $13,182 (estimate) seems too high, so let's reduce it. Total estimated cost before contingency: $12,955 (estimate) Contingency (15% of $12,955): $1,943 (estimate) Revised total estimated cost: $12,955 (estimate) + $1,943 (estimate) = $14,898 (estimate) Further adjustment: Total estimated cost before contingency: $13,100 (estimate) Contingency (15% of $13,100): $1,965 (estimate) Revised total estimated cost: $13,100 (estimate) + $1,965 (estimate) = $15,065 (estimate) To exactly match the budget: Total estimated cost before contingency: $13,035 (estimate) Contingency (15% of $13,035): $1,955 (estimate) Revised total estimated cost: $13,035 (estimate) + $1,955 (estimate) = $14,990 (estimate) Final tweak for precision: Total estimated cost before contingency: $13,050 (estimate) Contingency (15% of $13,050): $1,957 (estimate) Revised total estimated cost: $13,050 (estimate) + $1,957 (estimate) = $15,007 (estimate) Last adjustment for the exact budget match: Total estimated cost before contingency: $13,000 (estimate) Contingency (15% of $13,000): $1,950 (estimate) Revised total estimated cost: $13,000 (estimate) + $1,950 (estimate) = $14,950 (estimate) Increase the total estimated cost before contingency slightly: Total estimated cost before contingency: $13,100 (estimate) Contingency (15% of $13,100): $1,965 (estimate) Revised total estimated cost: $13,100 (estimate) + $1,965 (estimate) = $15,065 (estimate) To match the budget, reduce the total estimated cost before contingency: Total estimated cost before contingency: $12,955 (estimate) Contingency (15% of $12,955): $1,943 (estimate) Revised total estimated cost: $12,955 (estimate) + $1,943 (estimate) = $14,898 (estimate) Increase it slightly to get closer to the budget: Total estimated cost before contingency: $13,130 (estimate) Contingency (15% of $13,130): $1,969 (estimate) Revised total estimated cost: $13,130 (estimate) + $1,969 (estimate) = $15,099 (estimate) Final adjustment to fit exactly: Total estimated cost before contingency: $12,955 (estimate) Contingency (15% of $12,955): $1,943 (estimate) Revised total estimated cost: $12,955 (estimate) + $1,943 (estimate) = $14,898 (estimate) Increase the cost before contingency to match the budget: Total estimated cost before contingency: $13,300 (estimate) Contingency (15% of $13,300): $1,995 (estimate) Revised total estimated cost: $13,300 (estimate) + $1,995 (estimate) = $15,295 (estimate) Reduce to fit the budget: Total estimated cost before contingency: $13,100 (estimate) Contingency (15% of $13,100): $1,965 (estimate) Revised total estimated cost: $13,100 (estimate) + $1,965 (estimate) = $15,065 (estimate) Final tweak: Total estimated cost before contingency: $13,000 (estimate) Contingency (15% of $13,000): $1,950 (estimate) Revised total estimated cost: $13,000 (estimate) + $1,950 (estimate) = $14,950 (estimate) Increase slightly: Total estimated cost before contingency: $13,130 (estimate) Contingency (15% of $13,130): $1,969 (estimate) Re
The response lacks a clear final total, cut‑first recommendation, and the required "total checked" line.
Run 2 · Llama 3.3 70B · graded by GPT-OSS 120BNov 2, 2026Passed with a catch
The made-up sample (a messier one):
[ROOM, WHAT I WANT DONE]master bedroom – want a new walk‑in closet, repaint all walls (some accent stripes), replace the old carpet with engineered hardwood, add recessed lighting in the ceiling, and maybe a small TV niche. Also need new baseboards and door trim.[AMOUNT]around $14,000 (I’ve got a rough budget but I’m not sure if that’s enough).[WHAT]I can handle demolition, the painting, and installing the recessed lights myself, but I’ll need a pro for the flooring, closet framing, and any electrical permits.
- List line items with materials, labor, permits, disposal and contingency 10-20%
- Label every cost as an estimate
- State what to cut first if quotes are high
- Include total with "total checked" line
- Made up details we never gave it
Details it made up: “Demolition (self-performed) | $0 (labor), $100 (estimate) - disposal”, “Painting (self-performed) | $200 (estimate) - materials”, “Recessed Lighting (self-performed) | $500 (estimate) - materials, $100 (estimate) - permits”, “Engineered Hardwood Flooring | $3,000 (estimate) - materials, $2,000 (estimate) - labor”, “Closet Framing | $1,500 (estimate) - materials, $1,000 (estimate) - labor”
What came back (excerpt):
To build a comprehensive budget plan for your master bedroom renovation, I've broken down the estimated costs into line items.
Read the full answer
To build a comprehensive budget plan for your master bedroom renovation, I've broken down the estimated costs into line items. Please note that these are estimates and should be replaced with real quotes from professionals. | Line Item | Estimated Cost | | --- | --- | | Demolition (self-performed) | $0 (labor), $100 (estimate) - disposal | | Painting (self-performed) | $200 (estimate) - materials | | Recessed Lighting (self-performed) | $500 (estimate) - materials, $100 (estimate) - permits | | Engineered Hardwood Flooring | $3,000 (estimate) - materials, $2,000 (estimate) - labor | | Closet Framing | $1,500 (estimate) - materials, $1,000 (estimate) - labor | | New Baseboards and Door Trim | $800 (estimate) - materials, $500 (estimate) - labor | | TV Niche (optional) | $300 (estimate) - materials, $200 (estimate) - labor | | Electrical Permits | $200 (estimate) | | Disposal | $200 (estimate) | | Contingency (15% of total) | calculated below | Total estimated costs before contingency: $9,200 (materials and labor) + $600 (permits and disposal) = $9,800 Contingency (15% of $9,800): $1,470 Total estimated cost with contingency: $9,800 + $1,470 = $11,270 Total checked. To ensure we stay within budget, if quotes come in high, consider cutting the following first: 1. TV Niche - This is an optional feature and can be postponed or removed if necessary. 2. Accent stripes in painting - While aesthetically pleasing, this can be a DIY project or simplified to reduce costs. Quotes to get: 1. Engineered Hardwood Flooring (materials and labor) 2. Closet Framing (materials and labor) 3. New Baseboards and Door Trim (materials and labor) 4. TV Niche (materials and labor, if deciding to include it) 5. Electrical Permits 6. Recessed Lighting materials and any necessary electrical components 7. Painting materials (if not already purchased) 8. Disposal services Remember, these estimates should be replaced with actual quotes from professionals to get a more accurate budget.
Check that the contingency percentage is within the required 10–20% range.
How each run works: we fill the prompt with a made-up sample, run it once in Llama 3.3 70B, and GPT-OSS 120B grades the answer against the prompt's own rules. Word limits are counted by code, and every quote flagged as made up is checked against the full answer. Your results can differ. How we test.
Ready-made versionHome Project Quote Comparison
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