Claude for Small Business + Contractor Vault: Running a Contracting Business

A residential GC running between four and eight active jobs at any given time is, by trade, an operator. The actual building part is somewhere around 30% of the week. The other 70% is bids, change orders, supplier calls, payment chasing, customer comms, marketing posts you keep meaning to write, and the four phone calls a day where a homeowner asks something you'd rather have in writing.

Most contractors solve this by hiring an office manager. That works until the office manager goes on vacation and the bids stop going out.

The honest version of the AI offer for contractors is that two tools, stacked, replace about a day a week of office work. Claude for Small Business is Anthropic's verified plugin for the operator side — cash flow, AR, supplier emails, payroll, the boring stuff that has to happen. The Contractor Vault is the practitioner layer on top — bid proposals, change orders, scope-of-work docs, customer comms in your company voice, and the always-on lien-and-license guard that catches the language that would burn your bond.

💡 The pairing. Claude for Small Business is Anthropic's verified operator plugin — generic across any small business. The Contractor Vault is the practitioner layer for residential and light-commercial GCs — bid packages, change orders, project updates, marketing posts, with the lien-and-license guard locked in. $9 one-time, lifetime updates. Get the vault →

The two halves of running a contracting business

Contracting is two businesses operating at the same time. There's the running-the-shop business: payroll for the crew, supplier AP, customer AR, monthly P&L, the cash position that tells you whether to take the next bid or wait. Anthropic's Claude for Small Business is built for exactly that. It's generic across trades — same plugin a plumber uses, same plugin a roofer uses.

Then there's the practitioner side. Bid proposals that win, change orders that don't kill the relationship, customer updates that keep the homeowner happy, marketing posts that show the work. None of that is generic. The voice has to be your company, the trade has to be your trade, and the language has to stay on the legal side of your license and bond. Generic operator tools will happily draft a scope sentence that quietly puts you outside your license. That's a lawsuit.

The point is not to replace the office manager. It's to make the bid go out at 6pm the same day the lead came in.

What Claude for Small Business gives you

The Claude for Small Business plugin ships with five operator workflows. The relevant ones for a GC are:

• Cash and AR work — "Pull my cash position from QuickBooks and reconcile it against my PayPal settlements." Substitute your processor. For a GC the version is: cash position + open invoices + supplier AP coming due in the next 30 days.
• Invoice chasing — "Rank any overdue invoices that could close the gap. Draft reminder emails." For a contractor this is the bread-and-butter chase on the 20% retention or the second-draw on a remodel that's been "the check's in the mail" for six weeks.
• Monday brief — "Help me build a Monday morning brief every week in Slack." For a GC: which jobs are running, who's on which site, what's outstanding, what's the cash position, what bids are open.
• Month-end close — "Close out March for me." You probably don't do this today. The plugin makes it cheap enough to actually do.

Integrations include QuickBooks, PayPal, Slack, Google Workspace, Microsoft 365, and Canva. The fifteen building-block skills cover cash-flow forecasting, margin analysis, invoice chasing, and contract review.

What it doesn't do: draft a $40,000 kitchen-remodel proposal that wins, write a change order on a discovery-driven scope addition, write a delay-notification email that doesn't trigger a complaint to the licensing board, write a Houzz description that ranks. That's where the vault enters.

What the Contractor Vault adds on top

The Contractor Vault is built for working GCs. The relevant skills:

• /project-estimate — the estimate narrative once you've got the numbers from your takeoff or estimating software.
• /bid-proposal-cover-letter — the cover letter that goes on top of the proposal, in your company voice and with your terms.
• /scope-of-work — the SOW the customer signs.
• /change-order — the change-order draft for discovery-driven additions, with cost delta, timeline impact, and signature line.
• /lien-and-license-guard — the passive guard that fires if a draft asks you to do work outside your license, waive a lien improperly, or commit to something your bond won't cover. This is the one that earns the $9.
• /payment-schedule-reminder — the follow-up if a change-order payment doesn't come in on time.
• /project-kickoff — the post-signing kickoff email.
• /progress-update — the weekly or biweekly status note: what got done, what's next, decisions needed.
• /project-completion-email — closes out the project, links the punch list, sets up the review request.
• /review-request, /one-year-followup, /referral-thank-you — the closeout sequence that stacks future leads.
• /facebook-post, /houzz-description, /google-business-post — the three marketing posts you should be running but aren't.
• /delay-notification, /rfi-to-architect, /complaint-response, /punch-list, /subcontractor-scope-email — the operational drafts that come up weekly on real jobs.

Full list is /contractor-skill-catalog once installed.

The combined workflow: a worked example

A $40,000 kitchen-remodel bid from first call to final review. One job, six months, the whole cycle.

Day 0 — Lead comes in

Homeowner calls Monday at 4pm. Kitchen remodel, mid-range, wants three bids by Friday. You do the walkthrough Tuesday morning.

You spend Tuesday afternoon doing the takeoff and getting your subs to quote. By Tuesday evening you have your numbers. Now the bid package.

Open the vault:

Then:

Then:

Wednesday morning the homeowner has a clean three-document package: cover letter, line-itemed estimate narrative, scope of work with terms. That's what wins against the contractor who emails a PDF of a spreadsheet.

Day 14 — Contract signed

Switch to operator pass on Claude for Small Business briefly:

Back to vault:

Week 4 — Discovery

Demo's done. You find rotted subfloor under the old fridge. Going to cost $1,800 more and add three days.

Two weeks later the homeowner asks if you can "throw in" rerouting a gas line while you're at the rough-in. Gas work is outside your license in this state — your sub does it, you don't. A generic AI would happily draft a friendly "yes, we can take care of that" reply. The /lien-and-license-guard catches it. The draft comes back routing the work explicitly through your licensed gas sub, with the scope, the separate invoice line, and the language that keeps the homeowner from later claiming you self-performed the work. That's the difference between a clean job and a complaint to the licensing board.

Then:

Both go to the customer Friday afternoon.

Week 8 — Final stretch

If payment is late on the rough-in draw, the vault has it:

Week 10 — Closeout

Five days later:

And the marketing pass:

One year later

That's the email that turns a finished job into the next finished job.

Why this stack matters now

Anthropic shipping Claude for Small Business as a verified plugin means the operator-side AI for a contracting business is now a solved problem at the platform layer. Cash flow, AR, supplier emails — you shouldn't be building those from scratch.

What you should be doing is keeping the practitioner-side work — the bids, the change orders, the customer comms, the marketing — yours. That's where the trade reputation lives. The Contractor Vault was built for Cowork from the start, with the lien-and-license guard baked in from v1.

The two together cover the office. The crew still has to actually build the kitchen.

Get started

1. Install Claude for Small Business — Anthropic's verified plugin. Free with Claude Cowork.
2. Get the Contractor Vault — $9 one-time, lifetime updates. 43 skills tuned for residential and light-commercial GCs.
3. Run /bid-proposal-cover-letter on your next bid this week. That's the smallest meaningful test. If the cover letter sounds like your company, the rest of the stack is worth setting up.

The operator layer is the OS. The vault is the professional license.

Sources

• Anthropic: Claude for Small Business
• Anthropic: Claude for Small Business plugin
• Anthropic: Claude plugins overview