Late Payment Demand Letter for Architecture and Drafting Services

What a good one includes

• Clear identification of the contract or proposal, including the date it was signed and the project address.
• A detailed breakdown of the unpaid invoices, tied directly to completed project phases like schematic design, design development, or construction documents.
• The exact total amount currently due, including any pre-agreed interest or late fees calculated from the original payment terms.
• A firm and specific deadline for payment, typically seven to fourteen business days from the date of the letter.
• Acceptable payment methods and clear instructions on how to submit the funds immediately.
• A polite but unambiguous statement regarding the suspension of services or withholding of CAD files and construction licenses until the balance is cleared.

Common mistakes to avoid

• Using emotional or accusatory language that damages professional credibility and makes court resolution more difficult if escalation is required.
• Failing to explicitly state the consequences of non-payment, such as pausing work on-site or withholding building permit submittals.
• Sending the letter without verifying that all previous contract milestones and deliverables were actually met on your end.
• Forgetting to attach copies of the unpaid invoices and the original signed agreement for easy reference.

Frequently asked questions