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small business · ~25 min

Turn job-site or project notes plus your rates into a line-item service estimate—without inventing prices; labeled estimate, not a contract.

Last verified: 2026-09-08Lumina seed `service-estimate-from-job-notes`

This is an estimate, not a contract or bid. Do not invent prices or quantities. Recompute totals in Sheets.

Top picks

Best Overall

Claude

Structured line items; leaves blanks instead of inventing prices.

Open Claude

Best Free

ChatGPT Free

Good for a single estimate draft from pasted notes.

Open ChatGPT

Best Power-User

Claude + Google Sheets

Draft line items in chat; recompute totals in Sheets. Proposal-style narrative belongs in freelance-proposal-from-scope, not here.

Open Google Sheets

Protocol

  1. Assemble the estimate pack (5–8 min).

    Customer/job address or project name, job notes (what was measured/observed), your labor rates, material unit costs you will use, markup/tax rules you already apply (or NONE), exclusions, validity period you use, and deposit terms you use (or NONE). Distinct from freelance-proposal-from-scope (scope narrative + investment). This recipe is a trades/agency estimate: quantities, line items, materials, labor—from your rates.

  2. Lock “estimate not contract” + no invented prices.

    Paste the rules first. A missing quantity or unit cost becomes [NEED FACT], not a guess.

    Copy-paste prompt

    Draft a SERVICE ESTIMATE (not a proposal essay, not a contract) from my job notes and rate card.
    Hard rules:
    - Use ONLY rates, quantities, material costs, tax/markup, and terms I provide. Do not invent prices, discounts, allowances, or “market averages.”
    - If a quantity or unit cost is missing, output the line with [NEED FACT]—do not guess.
    - Label the document clearly: ESTIMATE — not a contract / not a binding bid unless I say otherwise.
    - Output: header (customer/job), line-item table (Item | Qty | Unit | Unit cost | Line total), subtotal, tax/markup only if I provided rules, grand total, Assumptions, Exclusions, Validity, Next step.
    - Keep narrative minimal—this is for trades/agencies quoting work, not a freelance proposal.
    Confirm in one sentence, then wait for my pack.
  3. Fill pack (step 3a) and generate (step 3b).

    Paste job notes and your rate card, then send the generate command.

    Paste pack

    CUSTOMER / JOB NAME: [ ]
    SITE / PROJECT NOTES (measurements, scope observed):
    [ ]
    LABOR RATES I USE:
    [e.g. tech $X/hr; helper $Y/hr]
    MATERIAL UNIT COSTS I WILL USE:
    [list or NONE—leave materials as NEED FACT]
    QUANTITIES I MEASURED OR WILL BILL:
    [ ]
    MARKUP / TAX RULES I APPLY:
    [or NONE]
    EXCLUSIONS:
    [ ]
    VALIDITY PERIOD I USE: [e.g. 15 days / NEED FACT]
    DEPOSIT / PAYMENT TERMS I USE: [or NONE]

    After you send the filled pack, copy the Generate command in the next box and paste it into the SAME chat so the AI runs the decision tree / produces the output.

    Generate command — copy and send this next (same chat)

    Build the estimate now. Every missing price or qty = [NEED FACT]. Show arithmetic for each line. Label ESTIMATE — not a contract.
  4. Second-model check + Sheets total (5–8 min).

    Recompute line totals and grand total in Sheets. If chat and sheet disagree, trust the sheet. Then send:

    Second-model check

    Here is a service estimate from another assistant plus my rate card and job notes.
    Find: (1) invented prices or quantities, (2) math errors, (3) scope that wasn’t in my notes, (4) contract-like promises I didn’t authorize.
    Return only corrections. Not legal advice.
  5. Human send.

    Fill [NEED FACT]. Send as “Estimate” with your validity window. Use a real agreement/change-order process when money moves.

When not to

  • Not a contract, bid bond, or legal advice.
  • Do not invent unit prices, quantities, or “typical” trade allowances.
  • Do not use this recipe for freelance scope proposals—use freelance-proposal-from-scope.
  • Skip if you have neither job notes nor a rate card.

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