A contracting company doesn't manage accounts — it manages projects, each with its own budget, schedule, team, and independent profitability. Software that treats it as a single trading company gives it figures that are accounting-correct and managerially useless.
This guide walks the project cycle in six stations, pointing at the most common leak in each.
1. The Contract and the Budget
A project begins with a contract value and a cost estimate. That budget isn't a document to file — it is the reference every later project cost is measured against.
It is built by line: materials, labour, equipment, subcontractors, site expenses. Without that detail you won't know where you overran — only that you did.
Where it leaks: a contract with no detailed budget, so every cost looks acceptable until the money runs out.
2. Purchasing and Supply Orders
Every purchase is linked to its project and to the budget line it belongs to. And here the most practically useful thing happens: the system compares purchases against the budget before spending, not after.
Where it leaks: materials bought for one project and posted to another or to general overheads — producing misleading profitability for both.
3. Site Inventory
Materials delivered to site aren't an expense yet — they are stock until consumed. Confusing the two makes project cost look higher one month and lower the next for no real reason.
Where it leaks: surplus materials at a completed site neither transferred to another project nor accounted for — then bought again for the next one.
4. Labour and Equipment
The two largest items after materials, and the hardest to allocate. A worker splits the week across two projects; a machine moves between three sites.
The answer isn't absolute precision but a reasonable, consistent allocation: labour hours charged to projects, and a daily equipment rate charged to the site it works on.
Where it leaks: leaving labour and equipment as general overheads — so every project looks profitable while the company loses money.
5. Payment Certificates and Collection
A contractor spends first and gets paid later in instalments tied to progress. That timing gap is the most dangerous feature of the business: a project profitable on paper can bankrupt its owner through cash-flow timing.
Where it leaks: a certificate issued late, or built on an outdated contract value not updated with approved change orders.
6. Closeout and Retention
Execution ends and the project doesn't end financially: retention stays withheld for a year or more, subcontractors are still owed, and surplus materials remain.
Where it leaks: retention forgotten after project closeout — among the largest sources of real money lost by contractors.
The Whole Picture
| Station | Most common leak |
|---|---|
| Contract and budget | A budget with no detailed lines |
| Purchasing | A purchase posted to the wrong project |
| Site inventory | Surplus never transferred, bought again |
| Labour and equipment | Left as general overheads |
| Payment certificates | Late issue and an outdated contract value |
| Closeout | Forgotten retention |
Note that none of these is an engineering or execution error — they are all gaps in linking information to the project.
For the accounting side see the best accounting software for contractors, and for certificates the payment certificates guide.
The One Indicator to Watch Weekly
For every live project: percentage complete against percentage of budget consumed. A project 40% complete having consumed 65% of its budget tells you early that it is heading for an overrun.
The value is in timing: catching it in month two means you can act; catching it at closeout means you are only recording the loss.
Frequently Asked Questions
What makes an ERP suitable for contractors?
Accounting at project level rather than company level: a line-item budget, purchases, labour, and equipment charged to projects, progress-based certificates, and retention tracking. A general trading system doesn't know this cycle.
Why do profitable contracting companies fail?
Cash-flow timing. A contractor spends first and collects later in instalments, so a project profitable on paper can drain liquidity if certificates or collections are delayed.
How do I charge labour and equipment to projects?
With a reasonable and consistent allocation: labour hours charged to the projects worked on, and a daily equipment rate charged to its site. Absolute precision isn't required, but leaving both as overheads makes every project look profitable.
What is the difference between site materials and expense?
Materials delivered to site are stock until consumed, not expense. Confusing the two makes project cost swing between months for no real reason and distorts profitability.
Which indicator should I track weekly?
Percentage complete against percentage of budget consumed, per live project. The gap between them is your early warning of a cost overrun, and the earlier you see it the more options you keep.
How do I track retention?
The system should record it as a receivable when deducted from each certificate, with a release due date. A list of retention and its dates is the fastest money recoverable from your old books.
Conclusion
A contracting company isn't measured by the size of its contracts but by its ability to answer two questions per project: how much have I spent against what I have completed? and how much am I owed and when is it released?
Pick a live project and ask it today. The time the answer takes measures exactly what your system is missing.