A spreadsheet can hold a capable project-control model, but frequent users may prefer guided forms and a concise dashboard. A private Google Apps Script interface can provide that layer while leaving the Sheet as the backend record in the owner's account.

Keep the deployment private

The safest intended setup is a bound Apps Script deployment that executes as the owner and is accessible only to the owner. The Sheet should remain Restricted. Broader access changes the security and operating assumptions and requires an independent review.

Validate before writing

Useful entry forms validate required values, linked IDs, dates, permitted statuses, nonnegative amounts, retention, deductions, duplicates, and overpayments. Server-side checks matter because browser controls alone can be bypassed.

Show decisions, not clutter

The dashboard should emphasize active projects, revised contract, actual and forecast cost, projected gross profit, billings, collections, outstanding balances, and exceptions. The underlying registers remain available in the Sheet for audit and correction.

Respect the product boundary

A private management dashboard does not certify project progress, create official invoices, perform quantity takeoffs, calculate payroll or tax, or satisfy permit and PCAB requirements. Signed approvals and regulated records belong in their proper systems.

BuildKita PH Private Google Sheets Web App provides this owner-only dashboard and guided-entry workflow as source deployed in the buyer's Google account.