Progress invoicing on long construction projects: what's your billing rhythm?

Long construction jobs — whether it's a custom home build, a commercial fit-out, or a multi-phase renovation — need a sensible billing rhythm to keep cash flowing without overcomplicating the invoicing.

How do you structure your progress billing in QBO? Do you invoice at fixed percentage milestones (30/60/10% for example)? Do you bill monthly against actual costs incurred? Or do you tie invoices to specific project milestones like 'foundation complete' or 'lock-up'?

Also curious: how do you communicate progress to your clients — do you use the QBO estimate summary on the invoice, or do you supplement it with a separate schedule of values?