OFFICE MANAGER OR CONTROLLER? ONE KEEPS THE OFFICE GOING, ONE CHECKS THE NUMBERS.
An office manager keeps the office working: payroll inputs, AP, invoicing, insurance certificates, permits and phones, and in most small subcontractors, the bookkeeping too. A controller reviews whether those numbers are right and turns them into a monthly profit figure by job. An office manager is usually enough below about $2M. Above that, the owner needs someone to check the office manager's work every month, because the person entering the numbers cannot also be the only person reviewing them.
The office manager is often the most trusted person in a subcontracting business, and that trust is earned. The risk comes from the job description growing faster than the training. As the company grows, the office manager ends up coding job costs, building pay applications and closing the month with no one checking the work and no construction accounting background to lean on. The answer is rarely replacing them. It is adding a controller review above them, which protects the business and usually makes the office manager's job easier.
WHAT EACH ONE DOES.
| Capability | Office manager doing the books | Office manager plus a controller |
|---|---|---|
| Best fit by revenue | Under about $2M | About $2M and up |
| Who reviews the books | The owner, when there is time | A controller, every month |
| Job cost accuracy | Depends on the owner's memory | Reviewed against the estimate |
| WIP schedule | Usually none | Built and reviewed monthly |
| Separation of duties | One person enters and pays | Entry and review are split |
| Construction accounting training | Learned on the job | Brought by the controller |
| When the person is out | The office stops | The controller covers the close |
| Where it goes wrong | No one checks the work | Adding cost the company is too small for |
ENOUGH WHILE THE OWNER CAN SEE EVERY JOB.
An office manager who keeps AP, AR, payroll inputs and the bank reconciled is enough while the owner can still see every job from the truck. The owner does the controller work in their head by knowing what each job should cost.
This stops working once the owner can no longer see every job. The usual sign is a P&L that says the year was good and a bank balance that says otherwise, or a job that ends well below the margin everyone expected.
THE SAME TEAM, WITH A MONTHLY REVIEW ABOVE IT.
A controller, full-time or fractional, sets the cost coding and approval rules, reviews the office manager's close each month, builds or reviews the WIP schedule and goes through cost to complete with the owner and project managers.
The office manager keeps the work they do well and gets a reviewer who can answer construction accounting questions. The owner gets a second set of eyes on cash, which is also the simplest protection against errors and fraud in a small office.
WHERE WE COME OUT.
Keep a good office manager. Once the company passes the point where the owner can see every job, add a controller review above them. The cost of a monthly review is small next to one bad job or one missed fraud, and the office manager gets support with the work they already have.
If the office manager is already overloaded, split the role before adding a controller: move bookkeeping to someone who does it full-time, and let the office manager keep the office.
FREQUENTLY ASKED.
