Billing workflows
Architect Progress Invoices by Phase and Percent Complete
How small architecture firms can invoice project phases, reimbursable costs, consultants, additional services, and retained balances.
By the FreeInvoices.co team | Updated August 9, 2026 | 6 min read
Architecture invoices arrive before a building does. The client is paying for decisions, drawings, coordination, and risk reduced on paper, so progress can be hard to judge from the outside. Phase-based billing gives the work a visible frame. A client may not know how many hours schematic design took, but they understand that the phase is seventy percent complete and what remains before design development begins. Use the contract's phases, show prior billing, and keep additional services from blending into the base fee.
Build the Invoice From the Fee Schedule
Start with the contracted fee allocated across phases such as programming, schematic design, design development, construction documents, bidding, and construction administration. For each phase, show fee, percent complete, earned to date, previously billed, and current amount. This creates continuity between invoices. Do not reset the story each month. The client should see that a phase billed at forty percent last month moved to sixty-five percent now, even if several deliverables are still being coordinated.
Use Percent Complete With Judgment
Percent complete is not hours used divided by hours budgeted. It reflects actual phase progress and remaining effort. A package can look almost finished while coordination and review still carry substantial work. Review percentages with the project manager before invoicing, then keep a note about the basis. Avoid magical jumps at month-end. If progress stalls because the client has not made a decision, invoice earned work and explain the hold in the project update rather than stretching the percentage to meet cash needs.
Separate Additional Services
Changes in scope, redesign after approval, extra meetings, visualization, measured drawings, code research beyond the agreement, and accelerated schedules may qualify as additional services. Follow the contract's notice and approval process before doing them. On the invoice, reference the authorization and describe the service separately from the base phase. This protects the original fee comparison. If extra work is quietly buried in schematic design, the phase looks over budget and the client cannot see what changed.
Reconcile Consultants and Reimbursables
Structural, civil, landscape, rendering, printing, travel, permit reproduction, and courier costs should follow the markup or pass-through rules in the agreement. Name significant consultant billing periods and attach support when required. Do not invoice a consultant amount as your own professional fee. For large outside costs, bill promptly rather than carrying them for months. The firm is not meant to become a free bank for a project with a slower client approval cycle.
Send the Invoice With the Monthly Project Update
A short note about milestones reached, decisions pending, and next work gives the percentage context. The invoice then lands beside evidence of progress rather than alone in accounting.
Frequently asked questions
Can I invoice a phase before the deliverable is issued?
Yes, when the contract provides progress billing and work has been earned. Show the percent complete and what remains. The final portion of the phase can be billed when its defined deliverable or milestone is reached.
How should retainage appear?
Show the amount withheld from current earnings and the accumulated retainage balance. State the release condition from the contract. Do not let retainage disappear inside a reduced payment total.
