What Internal Controls Should a Construction Company Have?

Construction companies should have internal controls that help protect cash, reduce errors, improve accountability, and keep project and financial information reliable.

Important controls may include:

payment approvals;
vendor setup;
purchase authorization;
change-order approval;
payroll review;
job-cost coding;
bank reconciliations;
credit-card oversight;
system permissions; and
recurring financial review.

The right control environment depends on the size and complexity of the business.

A five-person contractor will not have the same processes as a $100 million company.

But every contractor benefits from clear answers to three questions:

Who can initiate a transaction?

Who can approve it?

Who reviews what ultimately happened?

Why Internal Controls Matter in Construction

Construction businesses often have financial activity spread across:

project managers;
field teams;
accounting;
payroll;
purchasing;
subcontractors;
vendors; and
owners.

That creates many handoffs.

Without clear controls, contractors may experience:

duplicate payments;
unauthorized purchases;
incorrect job-cost coding;
payroll errors;
vendor fraud;
missing change orders;
weak financial reporting;
and unreliable WIP.

Strong controls help the information move through the business consistently.

Internal Controls Are Not Just About Fraud

Fraud prevention matters.

But internal controls also help prevent ordinary mistakes.

Examples include:

paying the same invoice twice;
charging materials to the wrong project;
forgetting to bill an approved change order;
failing to remove a former employee's system access;
or missing a bank transaction during close.

Most control improvements make the accounting process more reliable as well as more secure.

Start With Segregation of Duties

One of the core internal-control concepts is segregation of duties.

Ideally, one person should not control every step of a transaction.

For example, the same person should not necessarily be able to:

create a vendor;
enter an invoice;
approve the invoice;
release payment; and
reconcile the bank account

without additional review.

Separating those responsibilities reduces the opportunity for both error and misuse.

Small Contractors Still Need Controls

Smaller contractors may not have enough people to fully segregate every accounting function.

That does not mean controls are impossible.

Management can use compensating controls such as:

owner review;
bank activity review;
dual approvals;
exception reports;
system notifications;
monthly financial review; and
outside accounting oversight.

The control design should fit the size of the team.

Control Vendor Setup

Vendor setup is an important risk area.

A strong process may require:

complete vendor information;
W-9 collection;
independent verification of banking changes;
approval before activation;
restricted access to vendor master files;
and periodic review of duplicate or inactive vendors.

Changes to banking instructions deserve particular attention.

Verify Vendor Banking Changes Independently

If a vendor emails new payment instructions, do not rely solely on the email.

A strong process may require confirming the change through a known contact using previously established information.

This helps reduce the risk of payment-diversion fraud.

Separate Vendor Setup From Payment Approval

Where practical, the person creating or modifying vendor information should not be the only person approving payment to that vendor.

That creates another layer of review.

For smaller companies, an owner or controller may review new vendors before the first payment is released.

Use Purchase Authorization

Contractors should define who can commit the company to spend money.

Purchase authorization may include:

dollar thresholds;
project-manager limits;
purchase orders;
approved vendors;
equipment authorization;
and escalation for larger purchases.

Without clear limits, employees may unintentionally commit the business to costs leadership did not expect.

Tie Purchasing to the Job Budget

Project purchases should be compared with:

approved budget;
cost code;
committed cost;
and expected cost to complete.

That improves both control and job-cost visibility.

A purchase process that is disconnected from the project budget can make WIP less reliable.

Control Purchase Orders

Where purchase orders are used, they can help document:

vendor;
project;
cost code;
approved amount;
scope;
and authorizer.

They can also help accounting identify commitments before the invoice arrives.

That improves cash and WIP forecasting.

Use Invoice Approval Workflows

Vendor invoices should generally be approved by someone who can confirm:

the goods or services were received;
the amount is reasonable;
the project and cost code are correct;
the invoice matches the contract or purchase order;
and payment is appropriate.

Electronic approval workflows can create a clearer audit trail than informal email approvals.

Separate Invoice Approval From Payment Release

Approving an invoice and releasing cash are different functions.

A contractor may require:

Project manager: confirms project cost.

Accounting: enters invoice.

Owner/controller: approves payment.

Authorized signer: releases payment.

The exact structure will vary, but the roles should be deliberate.

Use Dual Approval for Large Payments

Larger payments may warrant additional review.

For example:

Payments under $10,000 may require one approval.

Payments over $10,000 may require two.

The actual thresholds should reflect the contractor's size and risk profile.

Review Payment Batches Before Release

Before ACH, check, or wire payments are released, management may review:

vendor;
amount;
project;
invoice date;
approval status;
and unusual or duplicate items.

That review can catch errors before cash leaves the account.

Control Manual Checks and Wires

Manual payments often bypass normal workflows.

Contractors should establish clear rules for:

emergency checks;
wires;
manual ACH;
vendor advances;
and owner reimbursements.

Exceptions should be visible and reviewed.

Protect Online Banking Access

Banking permissions should follow the principle of least privilege.

Employees should have only the access needed for their role.

Consider separating permissions for:

viewing;
initiating ACH;
approving ACH;
initiating wires;
approving wires;
and account administration.

Multi-factor authentication should be used where available.

Reconcile Bank Accounts Monthly

Bank reconciliations are one of the most important financial controls.

Every significant cash account should be reconciled regularly.

The reconciliation should identify:

outstanding checks;
deposits in transit;
bank fees;
transfers;
unexpected transactions;
and accounting errors.

A bank account that is not reconciled cannot be relied upon.

Have Someone Review the Reconciliation

Where possible, the person reconciling the bank account should not be the only person reviewing the result.

A controller, owner, or other designated reviewer may look for:

old outstanding items;
unusual transfers;
unexplained adjustments;
and unreconciled differences.

Control Credit Cards

Construction businesses may have many cards in the field.

That creates convenience—and risk.

Useful controls may include:

defined card limits;
named cardholders;
receipt requirements;
timely expense submission;
job and cost-code assignment;
review of unusual merchants;
and monthly reconciliation.

Credit-card activity should not become a separate accounting system.

Restrict Personal Purchases

Company cards should have a clear business-use policy.

If personal purchases occur, there should be a documented process for:

identification;
reimbursement;
and review.

Mixing personal and business spending weakens both accounting and control.

Review Fuel and Fleet Cards

Contractors with significant vehicles or equipment may also monitor:

fuel-card usage;
vehicle assignment;
gallons purchased;
unusual transactions;
weekend activity;
and duplicate charges.

Operational controls can support financial controls.

Control Payroll

Payroll is often one of the contractor's largest recurring cash outflows.

Controls may include:

approved employee setup;
approved wage rates;
timecard review;
overtime approval;
job coding;
payroll register review;
and reconciliation to the general ledger.

Payroll should not be treated as an automatic process simply because software calculates it.

Review New Employees and Pay-Rate Changes

Changes to:

employee status;
compensation;
direct deposit;
bonuses;
and termination dates

should be authorized and documented.

This reduces both error and payroll fraud risk.

Control Time Entry

Time entry affects:

payroll;
job costing;
labor productivity;
and WIP.

Project managers or supervisors may review:

hours;
project;
cost code;
overtime;
and unusual entries

before payroll is processed.

Bad time coding can distort project profitability.

Job-Cost Coding Is an Internal Control

Accurate job-cost coding is not just an accounting preference.

It is a financial control.

Costs should consistently be assigned to:

correct project;
correct cost code;
correct department or class;
and correct accounting period.

Incorrect coding can make a profitable job look unprofitable—or hide a problem on another project.

Use Consistent Cost Codes

The estimating, accounting, and project-management systems should use a consistent cost-code structure where practical.

That makes it easier to compare:

Estimate → Budget → Actual → Forecast at Completion.

Review Job-Cost Exceptions

Management does not need to review every transaction individually.

Exception reports can highlight:

costs posted to closed jobs;
costs without project codes;
unusual negative costs;
significant budget overruns;
or large uncoded expenses.

Exception-based review can be efficient and effective.

Control Change Orders

Change orders affect:

revenue;
cost;
margin;
billing;
WIP;
and cash.

A clear process should define:

who can authorize additional work;
who can price the change;
who approves customer terms;
when costs can be incurred;
when revenue can be reflected;
and when billing occurs.

Informal change-order processes can create both margin and reporting problems.

Separate Approved and Pending Change Orders

Project systems should distinguish between:

approved;
pending;
disputed;
and rejected changes.

That helps prevent uncertain amounts from being treated like signed contract value.

It also improves WIP and cash forecasting.

Control Subcontractor Setup

Subcontractor controls may include:

executed agreements;
certificates of insurance;
tax documentation;
licensing;
lien releases;
payment terms;
and approved change orders.

The exact requirements depend on the contractor and jurisdiction.

Match Subcontractor Payments to Approval

Before payment, accounting may confirm:

approved invoice or pay application;
project-manager approval;
contract balance;
change orders;
retainage;
and required supporting documentation.

This reduces the risk of overpayment.

Monitor Subcontract Commitments

Accounting and project management should understand:

original subcontract amount;
approved changes;
billed to date;
paid to date;
retainage;
and remaining commitment.

Those balances affect both job costing and cash forecasting.

Control Customer Billing

Billing controls help ensure the contractor invoices what it has earned or is contractually entitled to bill.

Controls may include:

billing schedule;
project-manager review;
contract-value verification;
approved change orders;
retainage;
supporting documentation;
and accounting review.

Missed or inaccurate billing directly affects cash.

Reconcile Billing to WIP

Billing and WIP should tell a consistent story.

Management should understand significant:

underbillings;
overbillings;
pending billings;
and changes from prior month.

Control Accounts Receivable

Receivable controls may include:

regular aging review;
assigned collection responsibility;
dispute tracking;
customer credit review;
and escalation of overdue balances.

Collections should have an owner.

Control System Access

Accounting and project systems often contain sensitive information.

Permissions should be based on role.

Employees should not automatically receive access to:

payroll;
banking;
vendor setup;
financial statements;
employee information;
or system administration.

Access should reflect business need.

Remove Access Promptly

When an employee leaves, access should be removed promptly from:

accounting systems;
banking;
payroll;
email;
expense platforms;
project-management systems;
credit cards;
and other financial tools.

Offboarding is an internal-control process.

Review User Access Periodically

Even active employees may accumulate access over time.

Management should periodically review:

users;
roles;
administrator rights;
approval rights;
and payment permissions.

Access that is no longer needed should be removed.

Protect Administrator Accounts

Administrator access can often:

change permissions;
create users;
alter workflows;
or access sensitive information.

It should be limited to a small number of appropriate people.

Use Multi-Factor Authentication

Where available, multi-factor authentication should generally be enabled for sensitive systems, particularly:

banking;
payroll;
accounting;
email;
and system administration.

Compromised credentials can create significant financial risk.

Control Journal Entries

Manual journal entries can bypass normal transaction workflows.

Contractors should consider controls over:

who can post entries;
required support;
approval of significant entries;
and review of unusual entries.

This is particularly important for entries affecting:

revenue;
WIP;
cash;
payroll;
and related parties.

Review the General Ledger

A recurring ledger review can identify unusual items such as:

large manual entries;
unexpected negative balances;
costs posted to closed projects;
duplicate vendors;
or transactions in unusual accounts.

This can support both close quality and internal control.

Reconcile Balance-Sheet Accounts

The monthly close should include reconciliation of significant balance-sheet accounts.

That may include:

cash;
receivables;
retainage;
contract assets;
payables;
credit cards;
payroll liabilities;
debt;
fixed assets;
and contract liabilities.

Reconciliations help establish whether the financial statements are complete and accurate.

Review WIP Monthly

WIP should generally be reviewed with input from both finance and operations.

Project managers may provide:

remaining costs;
project status;
change orders;
schedule updates;
and margin expectations.

Accounting can then reconcile project data with the financial records.

Financial Review Is Itself a Control

One of the most valuable controls is management review.

Each month, leadership should review:

income statement;
balance sheet;
WIP;
cash;
receivables;
payables;
backlog;
budget vs. actual;
forecast;
and key KPIs.

Unexpected results should be investigated.

Compare Results With Expectations

Controls become stronger when management has a baseline.

Compare actual results with:

budget;
prior period;
prior year;
project estimate;
and current forecast.

Unexpected movements often reveal issues before they become large.

Use a Contractor Dashboard

A dashboard can help leadership identify exceptions in:

gross margin;
WIP;
underbillings;
receivables;
cash;
backlog;
working capital;
and other financial measures.

Document Approval Limits

Contractors should define who can approve what.

For example:

Project Manager: up to $10,000

Operations Manager: up to $50,000

Owner: over $50,000

The actual limits should reflect the business.

The important point is that employees should understand their authority.

Avoid Approval by Informal Habit

If approvals exist only because:

“That's how we've always done it,”

the process may break when:

someone is on vacation;
the company grows;
employees change;
or transaction volume increases.

Documented workflows scale better.

Build Controls Into Technology

Good systems can help enforce controls through:

approval workflows;
role-based permissions;
purchase orders;
payment limits;
audit logs;
document retention;
and system notifications.

Technology should reinforce the process.

It should not replace thoughtful control design.

Avoid Excessive Spreadsheet Dependency

Spreadsheets can be useful.

But critical controls become weaker when financial information is maintained in disconnected files with:

limited version control;
no approval history;
manual formulas;
and no audit trail.

Where practical, important processes should live in systems designed to support them.

Internal Controls Should Scale With the Company

A contractor with:

$3 million of revenue

may rely heavily on owner review.

A contractor with:

$30 million of revenue

may need:

stronger segregation;
formal approval limits;
more sophisticated systems;
controller oversight;
and documented close processes.

Growth changes control needs.

Growth Can Break Previously Effective Controls

A process that works with:

10 employees;
5 active projects;
and 50 monthly vendor invoices

may fail with:

75 employees;
30 projects;
and 500 invoices.

Control design should be revisited as transaction volume and complexity increase.

Prioritize the Highest-Risk Areas

Contractors do not need to redesign every process at once.

Start with areas involving:

Cash

banking;
payments;
credit cards.

Payroll

employee setup;
time;
pay rates.

Vendors

setup;
banking changes;
payments.

Projects

purchases;
job costing;
WIP;
change orders.

Systems

access;
approvals;
audit trails.

These areas often provide the greatest initial benefit.

A Practical Contractor Control Checklist

Leadership may ask:

Cash

Are bank accounts reconciled monthly?
Are payment releases independently reviewed?
Are wire and ACH permissions restricted?

Vendors

Are new vendors approved?
Are banking changes independently verified?

Purchasing

Are spending limits documented?
Are major purchases approved in advance?

Payroll

Are time and pay changes reviewed?
Is the payroll register approved?

Job Costing

Are project and cost codes reviewed?
Are significant variances investigated?

Change Orders

Are approved and pending changes tracked separately?

Credit Cards

Are receipts required?
Are statements reviewed?

Systems

Is access role-based?
Is terminated-user access removed promptly?

Financial Reporting

Are balance-sheet accounts reconciled?
Is WIP reviewed?
Does leadership review financial results monthly?

If the answer to several of those questions is no, there may be opportunities to strengthen the control environment.

Internal Controls Should Be Practical

A control that nobody follows is not a strong control.

Processes should be:

understandable;
appropriately documented;
efficient;
scalable;
and aligned with actual operations.

The objective is not bureaucracy.

It is reliable information and appropriate protection of company resources.

The Bottom Line

Construction companies should have internal controls that help protect:

cash

payroll

vendors

purchasing

job costing

WIP

systems

and

financial reporting.

Important controls may include:

payment approvals

vendor verification

purchase authorization

change-order approval

payroll review

job-cost coding

bank reconciliations

credit-card oversight

system permissions

and

recurring management review.

Strong internal controls do more than reduce risk.

They create more reliable financial information.

And better information allows contractors to make better decisions.

How Bilotta & Company Can Help

Bilotta & Company, CPAs, LLC works with construction contractors on accounting processes, internal controls, WIP reporting, job costing, financial systems, cash-flow forecasting, assurance, tax, and financial leadership.

Through our Contractor Compass® Financial Stewardship program, we help contractors build financial processes that connect:

people

systems

projects

controls

and

reporting.

Our Financial Stewardship as a Service® rhythm is:

Close → Analyze → Forecast → Decide.

That rhythm works best when the underlying information is reliable.

Strong internal controls help make that possible.

Explore Contractor Compass® →

Visit the Construction Contractor Financial Resource Center →

This article is provided for general educational purposes and should not be considered accounting, legal, cybersecurity, tax, fraud-prevention, or internal-control advice for a specific contractor. Appropriate controls depend on company size, staffing, systems, transaction volume, risk, and other circumstances.