Purchase Order and Inventory Software for Contractors
Generate purchase orders from the signed estimate, receive against them, and keep stock levels honest without a separate inventory system.
Materials are where estimates quietly become losses. What was quoted, what was ordered, what showed up, and what got used are four different numbers, and most contractors only ever see the first and the last.
SiteAnchor connects them. Purchase orders come out of the estimate, receiving updates both the job cost and the stock on hand, and consumption in the field draws stock back down.
What it does
POs generated from a signed estimate
- Signing an estimate produces the purchase orders its materials imply, split by supplier, rather than leaving you to rebuild the order by hand.
Stock split and automatic restock
- Where a material is partly on hand, the order splits between existing stock and what needs buying, and restocking triggers automatically.
Progressive draw-schedule POs
- Subcontractor purchase orders can follow a draw schedule, with the sub sending and receiving progress claims through the collaborator portal.
Overage warnings before you commit
- A purchase order that would push a budget line over is flagged as you issue it, while it's still a decision rather than a fact.
Consumption that reaches inventory
- Materials used on a work order or recorded in a daily log draw down stock, netted so the same material can't be counted against inventory twice.
Vendors and bills synced to QuickBooks
- Vendors, bills, and expenses sync to QuickBooks Online, so purchasing doesn't need a second pass in the accounting system.
How it works
- 01
Estimate gets signed
Its materials produce purchase orders grouped by supplier.
- 02
Issue and track
Send POs to vendors; budget overages flag as you commit.
- 03
Receive against the order
Receiving posts actual cost to the job and stock to inventory.
- 04
Field use draws it down
Work orders and daily logs consume stock as material leaves the shelf.
Works with the rest of the platform
Purchase Orders isn't a standalone module — it shares the same job record as everything else in SiteAnchor.
Estimating
Build a priced estimate from your own material catalog, reuse the assemblies you quote most, and send it out for a signature without leaving the job.
Job Costing
See committed versus actual cost on every job while it's running, broken down by cost code and phase, instead of finding out the margin after it closes.
Subcontractors
Bid work out to subs, track their insurance and rates, and run RFIs, submittals, and change orders through one hub — with no login required on their end.
Work Orders & Dispatch
Assign work company-wide, dispatch it to the field, and let material consumption adjust inventory as the job gets done.
For General Contractors
Coordinate subs, schedules, budgets, and clients across every job you have running — without a different app for each one.
For HVAC Contractors
Run installs and service out of one system, with equipment, parts, and crew hours tracked against the job that used them.
For Plumbing Contractors
Dispatch service calls, track truck stock as it gets used, and keep project plumbing on the schedule it's actually tied to.
Frequently asked questions
Do purchase orders get created automatically?
- Yes. A signed estimate generates the purchase orders its materials call for, split by supplier, with on-hand stock accounted for.
Does receiving materials update inventory?
- Yes — receiving updates both job cost and stock on hand, and later consumption in the field draws stock back down.
Will it warn me before a PO blows the budget?
- Yes. Issuing a purchase order that would exceed a budget line raises a warning at the point of commitment.
Do I need a separate inventory system?
- No — that's the point of keeping them together. Receiving against a purchase order updates stock and job cost in the same step, and consumption on work orders and daily logs draws it back down, so ordering and inventory can't disagree.
Can I track material across warehouse and trucks?
- Stock is tracked company-wide and moves as material is received and consumed, so the running number reflects what has actually left the shelf. It is a single stock pool rather than per-vehicle bin locations.
What happens if someone records the wrong quantity?
- Adjustments apply by delta and can be undone completely, with a guard against a double-submitted change counting twice.
Do purchase orders sync to my accounting?
- Vendors, bills, and expenses sync to QuickBooks Online, so purchasing doesn't need re-keying in the accounting system.