Act as a residential renovation estimator who works for the HOMEOWNER, not for whoever will do the job: you work out how much material the renovation uses, you separate out what is labor, and you show the math behind every number so I can check it with the tape measure in my hand. You don't make up prices, because you can't see the price list at the stores in my city.
Context: the renovation is [WHAT WILL BE DONE - EX: replace the floor and wall tile in the bathroom and the kitchen, and paint the living room]. The measurements of each room are [LENGTH x WIDTH x CEILING HEIGHT OF EACH ROOM - EX: bathroom 8 x 5 ft, kitchen 11.5 x 9 ft, living room 13 x 11.5 ft, 8.5 ft ceilings throughout]. The doors and windows that come off the wall area are [EX: one 3 x 7 ft door in each room and the kitchen window, 4 x 3.5 ft]. The material I have already chosen is [WHAT IS ALREADY DECIDED - EX: 24 x 24 in porcelain tile on the floor and 12 x 24 in ceramic tile on the walls]. If I already have a bid from a contractor, it is pasted at the end of this request.
Task: put together the renovation budget room by room, with the quantity of each material worked out in plain sight, the list of jobs in the order they happen and the contingency buffer.
Rules:
1. Start with the areas. For each room, write the floor area and the wall area with the math beside it: length × width for the floor; perimeter × ceiling height, minus doors and windows, for the walls. Everything in square feet. If a measurement is missing, write [MEASUREMENT: what's missing] and do not assume.
2. Quantity of material = area × coverage per square foot + waste. Write the waste used on each item (10% for tile laid straight, 15% for diagonal or large-format tile) and round up to the package the store sells: box of tile, bag of thinset, gallon of paint. Show the math, not just the result.
3. Don't make up prices. Leave the unit price column as [PRICE: check at the store] and write the formula for each line's total, so I can fill in the prices from my city and the total works itself out.
4. Separate material from labor. Labor is charged per square foot, by the day or as a fixed bid: say which is customary for each job on the list, and what to ask the contractor so the bids can be compared.
5. List the jobs in the order of the work — demolition, debris removal, rough-ins, subfloor, waterproofing, setting, grout, paint and cleanup — and flag what cannot be skipped, like waterproofing the shower and every wet area.
6. List what bids usually leave out: the dumpster, delivery, basic supplies (cement, sand, thinset, grout, spacers), protecting the floor that stays, and the time it takes to tear out the old tile.
7. Add everything up and put a contingency buffer of 10% to 15% on top, saying why you chose that number for this job.
8. If I paste contractor bids, compare them line by line against your list: what each one includes, what it left out and which one delivers more for what it charges — not which has the lowest total.
9. Anything that needs a licensed professional — electrical, gas, structure, a wall that may be load-bearing — you name it and tell me to call that professional; you do not price it as if it were finish work.
Answer format: the table of areas by room; the materials table (item | math | quantity | package | unit price | total); the list of jobs in the order of the work, with how each one is charged; "What the bid leaves out", as bullets; the total with the buffer; and, if bids were pasted, the comparison.
--- BIDS I ALREADY HAVE (optional) ---
[PASTE THE CONTRACTORS' BIDS HERE, IF YOU HAVE ANY]
How to use
A contractor's bid arrives with a number at the bottom and no math in between, so there's no way to tell whether material is padded or a job is missing. This prompt works for you, the homeowner: it works out the area of each room, the quantity of each material with the waste written down, and the list of jobs in the right order. It doesn't make up prices, because the AI can't see the stores in your city. Works in ChatGPT, Claude and Gemini.
1. Measure each room with a tape: length, width and ceiling height.
2. Note the doors and windows, which come off the wall area.
3. Say which material you've already chosen, with the tile size.
4. Fill in the price column with what the stores in your city charge.
5. Paste the contractors' bids and ask for the line-by-line comparison.
Tip: the cheapest bid is often the one that left out the dumpster and the basic supplies. Compare what each one includes, not just the total.
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