TL;DR The bottleneck on quotes isn't the spreadsheet — it's the covering letter, the inclusions/exclusions write-up, and the email that goes with it. ChatGPT does that bit in 12 minutes if you feed it the right context. Here's the exact prompt to copy, what bad output looks like, and how to make it sound like you wrote it.

Published February 2026 · Updated April 2026 · Reading time: 7 minutes · Written by Ryan Ramsay, founder of BuildBrief

The bit of quoting that actually eats your time

The numbers take an hour. You've done it a thousand times. The bit that takes another two hours is everything around the numbers — the covering letter, the scope summary, the inclusions and exclusions, the payment terms, the email that lands it in the homeowner's inbox.

Most builders end up sending a quote that's either three lines and looks careless, or nine pages of legal-sounding paragraphs that the homeowner won't read.

Here's the workflow that works. Twelve minutes from "I've finalised the price" to "quote sent." Free ChatGPT account. No software to buy.

Step 1 — Gather your inputs (3 minutes)

Before you open ChatGPT, write down or paste into a notes app:

If you don't have these to hand, you don't have a quote yet. You have an estimate. Different problem.

Step 2 — The prompt to use (1 minute)

Open ChatGPT (chatgpt.com). Paste this in, fill in the bracketed bits:

You're helping an Australian residential builder write a quote covering letter and email.

Client: [first name], in [suburb]. Project: [project type], approximately [duration]. Total contract sum: $[amount] inc GST. Scope summary: [paste your 5–8 lines]. Inclusions: [list]. Exclusions: [list]. Payment schedule: [terms]. Tone: [warm and professional / direct and businesslike / etc].

Write me two things: 1. A quote covering letter — max 250 words, Australian English, plain language, no jargon. 2. A 4-line email to send with the quote attached.

No corporate fluff. Don't use words like "leverage," "solution," or "partner." Write like a builder, not a marketing agency.

Hit enter.

Step 3 — What you get (and what to fix) (5 minutes)

The first version will be 80% there. Here's what to watch for:

The robotic phrases. "We are pleased to provide…" "Should you require any further clarification…" Delete those lines. Replace with how you'd actually say it.

Made-up specifics. It might invent a "20% deposit on contract signing, 30% at frame stage" when your actual terms are different. Always double-check the numbers and dates.

Too long. If the covering letter is over 250 words, tell it: "Cut this by a third. Keep the warmth, lose the padding."

Too generic. If it doesn't reference the suburb, the client's situation, or anything specific to the job — the prompt didn't have enough context. Add a line: "This is their first major renovation, they're nervous about budget overruns, and they've been waiting 8 months to start." Watch the rewrite.

Wrong English. It defaults to American English on free ChatGPT. Tell it: "Australian English. 'Realised' not 'realized'. 'Colour' not 'color'."

Step 4 — The 30-second polish (3 minutes)

Read it once. Out loud. If a sentence sounds like something you wouldn't say to the client face-to-face, change it.

Two things I always tweak by hand:

That's it. Quote out the door.

A real example

Here's roughly what the input and output look like, using a real builder's job (anonymised, names changed).

The builder's input:

What ChatGPT gave back (covering letter):

Hi Sarah,

Thanks for inviting me to quote on your kitchen renovation in Camp Hill. I know you've been weighing this up for a few months — I appreciate you taking the time to walk me through what you're after.

The attached quote covers a complete kitchen rebuild over approximately 4 weeks. The full contract is $58,400 inc GST, broken into four payment stages so you're never paying ahead of work delivered. The scope includes the strip-out, all rough-in trades, custom shaker cabinetry in white, a 40mm stone benchtop, splashback tiling, and painting.

A few things worth flagging upfront. Your appliances and decorative lighting aren't included — I've assumed you'll supply those, but happy to source if it helps. The only variation I can't predict is asbestos in the existing cabinetry; if we find any during demo, we'll stop, get it tested, and quote the removal separately.

I've tried to keep this straightforward. If anything's unclear or you want to talk through the inclusions, just ring me on [number] — easier than email for this stuff.

Speak soon, [Builder's first name]

The builder told me it took about 9 minutes including the prompt. Three minutes more to polish the opening and signoff before sending.

What this is not

Save the prompt

Once you've tweaked the prompt to suit how you write, save it as a note on your phone. Or in your CRM. Or paste it into the ChatGPT "custom instructions" so it remembers.

Now every quote you do this month, paste the prompt, fill in the bracketed bits, edit the output. Twelve minutes.

The leftover 1.5 hours per quote? Multiply that by the 12 quotes you do a month. That's 18 hours back. A full day of being on the tools instead of behind a screen.

Where this falls down

The output is only as good as your scope notes. If your inputs are vague — "kitchen reno, $60k" — the letter will be vague. If your inputs are clear and specific, the letter will be clear and specific.

This is exactly the same problem with leads themselves. A vague enquiry from a homeowner gives you nothing to quote against. A structured brief gives you everything you need. The 12 questions to ask before quoting covers what those inputs should look like.

That's why we built BuildBrief — to capture the brief from the homeowner before they ever reach you, so by the time you're sitting down to quote, you already have the inputs this prompt needs. Join the waitlist →

FAQ

Can ChatGPT write the actual quote spreadsheet? No. It will invent prices that aren't real. Use it for the words around the numbers — covering letters, scopes, emails, follow-ups. Never the rates.

How do I stop it sounding generic? Give it more context. Mention the suburb, the client's situation, anything personal. The more specific the input, the more specific the output.

Will the homeowner know it was AI-written? Not if you've polished it. The 30-second tweak — opening, signoff, one line in your own voice — is what makes it yours.

What about variations and progress claims? Same prompt structure works. Swap "quote covering letter" for "variation request" or "progress claim email." Tell it the situation, the amount, and the tone.

Free ChatGPT or Plus? Free is fine for this. Plus only matters if you want Voice Mode for site notes (covered in the voice-notes-to-quote article).

Where to go from here

Try this on your next quote. Just one. See if 12 minutes is real.

If it works, the next thing to fix is the inputs. Vague briefs from homeowners are why your quotes take three days. BuildBrief captures structured briefs at the front door so the inputs to your quotes arrive ready to use.

About the author

I'm Ryan Ramsay, founder of BuildBrief. I write practically about how Australian residential builders can use AI to win back the hours admin steals from them. The BuildBrief AI Tips and Tricks blog publishes a new piece every fortnight.

Question? Got a prompt that works for you? Email hello@wolfari.com.au.