Construction AP Automation: How It Works and What to Look For
Accounts payable (AP) automation is software that captures vendor invoices, codes them, routes them for approval, and posts them to the accounting system without manual data entry. Construction AP automation does the same for contractors, coding each invoice line to jobs, cost codes, and commitments in the ERP.
Most businesses code invoices to general ledger accounts. Contractors also code to jobs, cost codes, cost types, and commitments.
Take three invoices that arrive the same day:
- A material supplier sends one invoice covering deliveries to three jobs.
- A mechanical subcontractor submits a payment application with 10% retainage.
- An equipment rental company bills against an unapproved change order.
Each needs different coding, checks, and approvals before posting.
An invoice charged to the wrong job distorts job costs. One that exceeds its subcontract or purchase order means overbilling. One sitting in a project manager's inbox delays payment and month-end close.
Many AP teams spend as much time chasing missing information and approvals as entering invoices.
How does construction AP automation work?
Construction AP automation follows four steps:
- Capture invoices. Invoices arrive by email or upload. The software extracts vendor, amount, date, and line items.
- Assign cost codes. Each line is matched to a job, cost code, cost type, GL account, or commitment from your ERP.
- Route approvals. Rules send each invoice to the right project manager or accountant by job, vendor, or amount.
- Post to the ERP. Approved invoices write to the accounting system with no re-keying.
Reading an invoice is the easy part. Checking that its charges belong to the right job, match the right subcontract, and have the right approval is where things can get tough.
Agave AP Automation connects directly to your ERP. It reads your jobs, cost codes, and commitments, codes invoices with AI, and routes them for approval before posting. It splits multi-job invoices and routes each piece to its approver. It checks PO and subcontract invoices against committed amounts and flags overbilling.
What features does construction AP automation need?
General AP tools are built around vendors, GL accounts, and approvals. Construction AP software also has to track cost by project.
Five capabilities matter most.
1. Line-level job costing
One invoice may split across several jobs, phases, and cost codes.
The software should code each line with the cost structure already in your ERP, without a second set of jobs or cost-code lists.
2. Commitment matching
Subcontractors and suppliers bill against purchase orders, subcontracts, and change orders.
AP software should check charges against those commitments and flag anything over the remaining balance.
That catches billing problems before posting or payment.
3. Retainage tracking
Pay applications often withhold retainage until later in the project.
AP software should separate gross billed, retainage withheld, and net payable, so nobody recalculates them by hand.
4. Job-based approvals
Project managers review costs on their jobs. Accounting owns coding and payment.
Approvals should follow that split. A PM sees invoices on their projects, not every invoice in the company.
Multi-job invoices get a separate approval for each job.
5. Vendor statement reconciliation
A supplier's monthly statement can list invoices that never reached accounting, invoices still in approval, and charges already in the ERP.
Reconciling statements against AP records surfaces missing invoices, duplicates, and mismatches before they become payment problems.
Agave handles line-level coding, commitment matching, job-based approvals, and vendor statement reconciliation. Its AI reads invoices and subcontractor pay apps, and its ERP integrations keep coding tied to your existing systems.
Questions to ask AP automation vendors
Ask every vendor these six questions.
Start with ERP compatibility. A product can capture and approve invoices well and still leave accounting to key approved bills by hand.
That matters most on Viewpoint Vista, Sage 300 CRE, or Foundation, where the ERP is the source of truth for job costs and commitments.
Agave integrates with Viewpoint Vista, Viewpoint Spectrum, Foundation, Sage 300 CRE, Sage 100 Contractor, Sage Intacct, Acumatica, CMiC, Deltek ComputerEase, QuickBooks Desktop, and QuickBooks Online, and connects to Procore and Autodesk Forma Build on the project side.
It supports cloud, hosted, and on-premise installs, and most AP implementations take days.
What results can contractors expect?
AP automation saves more than data entry. It cuts time spent chasing approvals, fixing coding errors, and reconciling invoices.
Gerloff Contracting processes about 250 vendor invoices a week. Before Agave, accounting keyed every invoice by hand, twice for PO invoices, and project managers often saw costs only after posting.
Now about 85% of Gerloff's invoices run through Agave, coded and reviewed before posting. The team saves more than 10 hours a week and catches vendor pricing errors earlier.
Read Gerloff Contracting's story.
Walker Masonry runs about 1,000 invoices a month through Agave AP Automation with one AP specialist. Reviewing job costs synced into Procore through Agave.
How much does construction AP automation cost?
Construction AP software is sold as a subscription priced on company size, invoice volume, and integrations. Some vendors add an implementation fee.
Compare each quote against the manual work it replaces:
- Time spent entering and coding invoices
- Hours spent following up on approvals
- Corrections to miscoded invoices
- Duplicate invoices and vendor billing discrepancies
- Time spent preparing AP for month-end close
Those costs add up. Ardent Partners' State of ePayables 2025 puts the average cost to process one invoice at $9.84 and the average processing time at 8.2 days. The top 20% of AP teams, which lean most on automation, process invoices at 79% lower cost and 79% faster.
Agave AP Automation is a subscription based on business size, plus a one-time implementation fee. Buy it alone or with other Agave products.
Frequently asked questions
Can AI handle accounts payable for construction companies?
Yes. AI can read invoices, extract line items, assign job and cost codes, and route bills for approval. People still review exceptions and approve before posting.
Agave pairs AI invoice processing with construction ERP integrations and approval workflows.
Does Agave AP Automation work with Viewpoint Vista?
Yes. Agave integrates with Viewpoint Vista to read jobs, cost codes, and commitments, then write approved invoices back to Vista. Agave also supports Viewpoint Spectrum.
Does Agave work with Sage 300 CRE?
Yes. Agave supports invoice capture, coding, approvals, and ERP posting for Sage 300 CRE. Agave is also an official Sage 300 CRE partner.
Do project managers need to use another system?
Project managers approve in Agave and see only their jobs. Accounting admins control coding permissions and approval rules.
How long does implementation take?
Most customers go live in days. Agave reads jobs and cost codes from your ERP, so you don't rebuild your accounting structure.
About Agave
Agave builds AI software for construction finance teams. Its platform connects to the ERP and project management systems contractors already use, helping teams manage invoices, expenses, vendor compliance, financial data, and back-office workflows.
Agave serves more than 500 general and specialty contractors across North America and is backed by Accel and Y Combinator.
