We rebuild costing at the job level with a defensible basis for percentage of completion — cost-to-cost, or units where that is more honest — and we make the estimate that won the job the benchmark it is measured against every month. Variations get priced when they are instructed, not argued about at the final account.
Retention and holdback are tracked as the receivable they actually are, with a release date against each one, because on most contractors this is the single largest pot of unrecognized cash on the balance sheet.
Then the surety relationship: a WIP schedule they can rely on, delivered on a rhythm, with the same numbers in it as your management accounts. Bonding capacity moves when the surety trusts the reporting, not when the revenue grows.
Construction finance specialists who have prepared WIP schedules for surety review
With a named controller alongside them, a named backup on every seat, and the specialist bench behind both — all inside one fixed monthly fee.