A firm foundation for your AIA billing and compliance.
Full-cycle project accounting for subcontractors who work with general contractors, from the signed contract to the final retainage payment, and all the compliance in between.
- 50+
- general contractors worked with
- Under 60 days
- average from pay application to payment
- 5+ years
- in construction billing
| Item | Scheduled value | Completed to date | % | Retainage |
|---|---|---|---|---|
| Mobilization | $12,000 | $12,000 | 100 | $1,200 |
| Rough-in | $48,000 | $36,000 | 75 | $3,600 |
| Finishes | $36,000 | $9,000 | 25 | $900 |
| Total | $96,000 | $57,000 | 59 | $5,700 |
Bid the bigger jobs. We'll handle the general contractor's paperwork.
Many small to mid-size subcontractors pass on general contractor work because of 100-page contracts and complicated billing and compliance rules. We take that work off your plate, so you can go after larger projects with confidence.
Compliance is what holds up your payment. We keep it clear.
One missing lien waiver or expired insurance certificate can stall a pay application for weeks. We track every requirement on every job and submit it on time, so nothing stands between you and your money.
- Lien waiversConditional and unconditional, matched to each payment.
- Insurance certificatesTracked for expiration and the general contractor's requirements.
- Certified payrollPrepared and submitted, including through LCP Tracker.
- BondsDocumentation gathered and kept current.
- MWBE documentationSupporting paperwork for minority and women-owned business requirements.
- Stored materialsBills of sale and documentation so materials can be billed before installation.
- Maintenance and warranty documentsCloseout paperwork ready when the general contractor asks.
- Compliance portalsRequirements managed in the general contractor's system, including Marsh.
What else we handle
Fractional project accounting for the full billing cycle. Use all of it, or just the part you need.
- Job setup
- We review the contract's billing requirements, build your Schedule of Values, and set up trackers. When possible, we structure billing for a deposit so cash comes in at the start of the job.
- Monthly pay applications
- Accurate AIA pay applications, entered by the deadline and in the format your general contractor expects. We work with your project managers so each bill reflects that month's work.
- Change orders
- Approved change orders added to your billing, so completed work gets paid.
- Collections and forecasting
- We track payments, follow up with general contractors, and pursue final retainage. You get forecasts and accounts receivable reports, so you know when cash is coming in.
- Audit support
- We support audits and check your ERP system against independent billing records, so your numbers hold up.
Billing platforms we work in: Procore, Textura, GCPay, LCP Tracker, Marsh, and manual pay applications.
What it means for your business
Cash sooner
Our clients average under 60 days from pay application to payment. In our experience, many general contractors will agree to a material deposit when the stored materials documentation is in place.
Time back for your team
Pay applications pull project managers and office staff away from higher-value work. Hand them to us, and your team can focus on building, and even take on more projects.
Less than a full-time hire
A full-time project accountant can cost $100K or more a year with salary, payroll taxes, and benefits. We are a cost-effective alternative, tailored to your business.
Our preferred fee structure: we only get paid after you get paid. Your success is our success.
How it works
-
Get in touch
Tell us about your current jobs and where billing gets stuck.
-
Set up the job
We review the contract, build the Schedule of Values, and prepare any deposit.
-
Bill every month
You share progress. We prepare the pay application and track compliance.
-
Collect
We follow up on every payment through the final retainage.
Our core values
Our faith shapes how we serve our clients, our community, and our families.
Service to clients
We give you a reliable, professional framework for tracking your AIA money. You can be at peace knowing your billing, compliance, and collections are handled efficiently, while we work diligently to improve your cash flow from general contractors.
Proverbs 13:4
Service to community
We work to help others. Cornerstone donates 14% of its revenue to charitable organizations, and we aim for a quarterly day of service in our community.
Ephesians 4:28
Service to family
"I am an accountant, but I am also a wife, mother, and daughter. Cornerstone aims to give clients excellence while leaving time for rest with family. I love what I do, and that carries into the rest of my life." Allie Oxtoby
Ecclesiastes 2:24
About Allie Oxtoby
Allie is the founder and president of Cornerstone Billing Solutions. She has more than 5 years of experience in construction billing, working with subcontractors and with collections law firms, and has worked with over 50 general contractors.
She stays on top of every deadline and requirement while keeping relationships with general contractors strong. She knows the language of prompt payment laws and uses it to keep payments moving.
We are not a law firm and do not provide legal advice.
Organizations we support
- Food for the Hungry
- Compassion International
- Prison Fellowship
- The Summit Church
- Samaritan's Purse
- Wake County Public Schools
Member of
Let us handle your billing, so you can focus on building.
Send a short note about your jobs and where billing is getting in the way. Allie will reply personally.
cornerstoneaiabilling@gmail.com
Serving subcontractors across the US, remotely