Builders playbook · 5 free jobs

AI for builders: 5 jobs to hand to AI this week

Building disputes almost always come down to what was or wasn't written down. These jobs use AI to get it in writing quickly, without spending your evenings at the laptop.

Job 1 of 5ChatGPTClaudeCopilot

Write a detailed quote with a fair stage-payment schedule

Clients on bigger jobs want to see exactly what they're paying for and when. A stage-payment schedule protects your cash flow and their peace of mind.

Time: 30 minutes for an extension-sized jobCost: free tools work

A free AI chat tool, then Word, Google Docs or your quoting app

Steps

  1. Dictate or type your survey notes and your price breakdown by stage (groundworks, shell, roof, first fix, plastering, second fix, finishes).
  2. Paste with the prompt below.
  3. Check every line. Add your terms, insurance details and who's handling building control.
  4. Send it as a PDF and talk the client through it.

The exact prompt

Copy, paste, then fill in the [brackets]
Write a quote from a [UK] builder for [job, e.g. single-storey rear extension, 4m x 5m].
From my notes and prices only:
1. Scope of works by stage, in plain English.
2. Exclusions (e.g. kitchen units, decorating, landscaping, party wall surveyor fees, unforeseen ground conditions).
3. Provisional sums where I've given them, clearly labelled.
4. Stage payment schedule tied to completed stages, not dates: [my stages and amounts]. Don't suggest a large upfront payment.
5. Who handles: building control [me / client], planning [client], party wall [client].
6. VAT: [inc / ex / not registered]. Validity: [30 days].
Write [PRICE NEEDED] for anything missing. No guarantees or timescales I haven't given.

Notes and prices:
[paste]

✓ Check before you send

  • Payments are tied to completed stages and don't run ahead of the work.
  • Provisional sums and exclusions are clearly explained.
  • Responsibility for planning, building control and party wall matters is clear.

UK notes extra

Last reviewed Oct 2026. Free tools change. If a screen looks different, the steps still apply.Back to top ↑
Job 2 of 5ChatGPTWhatsApp Business

Send a weekly site update in 5 minutes from your photos

Clients who hear nothing assume the worst. A short Friday update with photos heads off most of the worried phone calls.

Time: 5 minutes a weekCost: free tools work

Your phone, a free AI chat tool, and WhatsApp or email

Steps

  1. On Friday, take 3 to 4 progress photos.
  2. Voice-note what got done, what's next week, any delays and any decisions the client needs to make.
  3. Paste the transcript with the prompt below.
  4. Send the update with the photos.

The exact prompt

Copy, paste, then fill in the [brackets]
Turn my notes into a short weekly update from a [UK] builder to a homeowner client. Under 120 words.
Sections: Done this week, Next week, Decisions needed from you (with a date I need them by), Anything held up (honestly, with the reason).
Friendly and straight-talking. Don't promise dates I haven't given.

Notes:
[paste]

✓ Check before you send

  • Delays are explained honestly.
  • Decisions needed have a clear deadline.
  • Dates are ones you can stick to.

UK notes extra

Last reviewed Oct 2026. Free tools change. If a screen looks different, the steps still apply.Back to top ↑
Job 3 of 5ChatGPTWhatsApp Business

Put a variation in writing before you do the extra work

"While you're here, can you..." is how jobs go over budget and friendships end. A quick written variation, agreed before work starts, avoids that.

Time: 3 minutesCost: free tools work

A free AI chat tool, and WhatsApp or email to get a written yes

Steps

  1. When the client asks for a change or you find something unexpected, note what, why, cost and time impact.
  2. Paste it with the prompt below.
  3. Send it and wait for a written "yes" before doing the work.
  4. Keep all variations in one list for the final account.

The exact prompt

Copy, paste, then fill in the [brackets]
Write a short variation notice from a [UK] builder to a client. Under 100 words.
Variation number: [V3]. What's changing: [e.g. move the radiator to the other wall at client's request] or [unforeseen: rotten joist found under bathroom floor].
Cost: [£000 inc/ex VAT]. Effect on finish date: [e.g. +1 day / none].
Ask them to reply "Yes, go ahead with V3" to approve. Neutral, factual, no pressure.

✓ Check before you send

  • The cost and time are realistic.
  • You have a written approval before starting.
  • Unforeseen issues come with a photo.

UK notes extra

Last reviewed Oct 2026. Free tools change. If a screen looks different, the steps still apply.Back to top ↑
Job 4 of 5ChatGPTClaude

Draft a construction phase plan for a small domestic job

Even small domestic jobs need a construction phase plan under CDM. AI can turn your site knowledge into a proportionate first draft.

Time: 30 minutesCost: free tools work

A free AI chat tool, checked against HSE guidance

Steps

  1. Read HSE's CDM guidance for small projects so you know what the plan needs.
  2. List the site details, the work, the hazards you can see and the trades involved.
  3. Paste with the prompt below.
  4. Check it against HSE guidance, make it specific to this site and brief your team on it.

The exact prompt

Copy, paste, then fill in the [brackets]
Draft a short, proportionate construction phase plan for a [UK] domestic job under CDM 2015.
Job: [description]. Site: [access, neighbours, occupied or not, children/pets present?]. Trades: [list]. Duration: [weeks].
Hazards I've identified: [e.g. working at height on the scaffold, asbestos survey result, excavations, services].
Sections: project details, key contacts (placeholders), site rules, welfare arrangements, main hazards and controls, emergency procedures.
Keep it practical, about 2 pages. Mark anything I need to confirm with [CONFIRM].

✓ Check before you send

  • It covers the real hazards on this site, not generic ones.
  • Asbestos is dealt with properly before any work on older buildings.
  • Welfare facilities (toilet, washing) are sorted.

UK notes extra

Last reviewed Oct 2026. Free tools change. If a screen looks different, the steps still apply.Back to top ↑
Job 5 of 5Google SheetsChatGPT

Keep CIS and subcontractor records tidy each month

CIS returns are monthly and the penalties add up. A simple monthly routine stops it piling up.

Time: 20 minutes a monthCost: free tools work

Google Sheets or your accounting software (Xero, QuickBooks and FreeAgent all support CIS, though some plans charge extra for contractor CIS filing), plus a free AI chat tool for formulas

Steps

  1. List each subcontractor payment: date, subbie reference, labour amount, materials amount, their verification status and deduction rate from HMRC.
  2. Use the prompt below to set up the sheet's formulas.
  3. Check each deduction against HMRC's verification result, not the AI.
  4. File your monthly return on time and send statements to subbies.

The exact prompt

Copy, paste, then fill in the [brackets]
Set up a Google Sheet for a [UK] contractor's monthly CIS records.
Columns: date, subcontractor ref, labour amount, materials amount, deduction rate (I'll enter 0%, 20% or 30% from HMRC verification), deduction, amount paid.
Give me: formula for deduction (rate x labour only), amount paid, monthly totals, and a check that flags any row missing a deduction rate.
Also a short checklist of the monthly CIS routine. Don't state deadlines; I'll check them on GOV.UK.

✓ Check before you send

  • Deductions apply to labour only, not materials.
  • Rates come from HMRC verification for each subbie.
  • Deadlines are checked on GOV.UK.

UK notes extra

Last reviewed Oct 2026. Free tools change. If a screen looks different, the steps still apply.Back to top ↑

Questions builders ask

Can AI write my contract?

It can draft a clear quote, schedule and variation notices from your notes, but for contract terms on bigger jobs, use a recognised standard contract or get legal advice.

Is it safe to put client details into AI?

Leave out names and addresses. Describe the job, not the household.

Which AI tool is free?

The free plans of ChatGPT, Gemini, Copilot and Claude cover all the writing jobs here. Xero, QuickBooks and FreeAgent support CIS, though some plans charge extra for contractor filing.

Privacy tip: don't paste customers' full names, addresses or other personal details into AI tools unless you need to and you've checked the tool's privacy settings.