Staffing an estimator, a project administrator and a bookkeeper in-house costs far more than the three salaries. Build it up line by line and the gap is wide. Payroll taxes, health coverage, retirement match, software, hardware, desk space, recruiting, ramp-up and the owner's own supervision hours all count. In the worked example below, the total comes to about $327,250 a year against $195,000 in salary, so salary is under 60% of what the seats actually cost. The figures are stated assumptions, not survey data. Swap in your own and the shape holds.
Why the salary line misleads
When a builder prices a hire, the number on the offer letter is the one that gets compared. It is also the smallest honest number available. The employer side of payroll shows up on the payroll provider's statement. Benefits come on the insurance invoice. Software shows up on a credit card, and the desk is buried in rent. None of it gets added back to the role that caused it.
Fully loaded cost answers one question: what would stop leaving the bank account if this seat were empty? That is the number to use when deciding whether to hire, outsource or keep doing the work yourself at 10 p.m.
The worked example: three roles, line by line
The assumptions are deliberately plain:
- Salaries: $85,000 for the estimator, $55,000 for the project administrator and $55,000 for the bookkeeper.
- Health coverage: an employer share of $10,000 per head.
- Retirement: a 3% match.
- Recruiting: a recruiter paid 20% of first-year salary, with an average tenure of three years.
- Ramp-up: the first three months at half productivity.
- Owner's time: valued at $100 an hour.
- Payroll taxes: the 7.65% employer share of Social Security and Medicare, plus an allowance for federal and state unemployment. Unemployment varies by state and by your claims history.
Change any of these and the totals move. The proportions move much less.
Estimator: $85,000 salary, about $135,250 loaded
- Salary: $85,000
- Employer payroll taxes: $7,000
- Health coverage, employer share: $10,000
- Retirement match at 3%: $2,550
- Workers' comp and liability allocation: $500 (clerical class codes are cheap, but not free)
- Takeoff and estimating software seats: $3,000
- Laptop, second monitor, phone and desk, spread over their life: $2,000
- Office space allocation: $6,000
- Recruiting, $17,000 fee spread over three years: $5,700
- Ramp-up, half productivity for three months, spread over three years: $3,500
- Owner supervision, 2 hours a week reviewing bids and answering scope questions: $10,000
Project administrator: $55,000 salary, about $97,250 loaded
- Salary: $55,000
- Employer payroll taxes: $4,800
- Health coverage, employer share: $10,000
- Retirement match at 3%: $1,650
- Workers' comp and liability allocation: $300
- Project management and document software seats: $1,500
- Hardware and desk: $2,000
- Office space allocation: $6,000
- Recruiting, spread over three years: $3,700
- Ramp-up, spread over three years: $2,300
- Owner supervision, 2 hours a week on contracts, RFIs and lookahead questions: $10,000
Bookkeeper: $55,000 salary, about $94,750 loaded
- Salary: $55,000
- Employer payroll taxes: $4,800
- Health coverage, employer share: $10,000
- Retirement match at 3%: $1,650
- Workers' comp and liability allocation: $300
- Accounting, payroll and bill-pay seats: $1,500
- Hardware and desk: $2,000
- Office space allocation: $6,000
- Recruiting, spread over three years: $3,700
- Ramp-up, spread over three years: $2,300
- Owner supervision, 1.5 hours a week approving bills and reviewing AR: $7,500
Add the three together and you get $195,000 in salary and $327,250 loaded. Salary is 59.6% of the total. The estimator is the closest to two-thirds at 62.8%, because a higher salary dilutes fixed costs like health coverage and desk space. The two $55,000 roles sit near 57%. The lower the salary, the larger the share everything else takes.
The three lines builders leave out
Payroll taxes and health coverage usually make it onto the worksheet. Three other lines usually do not, and together they come to about $36,000 a year in the example.
Recruiting is a real cost even without a recruiter. Writing the posting, screening, interviewing and checking references takes owner hours. A three-year tenure is generous for a back-office role at a small builder. Shorten it to eighteen months and the recruiting and ramp-up lines roughly double.
Ramp-up is the slow part. A new estimator needs time to learn your rate library, your subs and how you carry general conditions. A new bookkeeper needs time to learn your chart of accounts and job structure. If you run job costing in QuickBooks, a new hire also has to learn the workarounds your last person built. For more on those workarounds, see why QuickBooks is a good ledger but a poor job-costing tool. For the first months you are paying full salary for partial output, and often redoing some of it.
Supervision is the line owners most resist counting, because it is their own time. But 5.5 hours a week across three hires adds up to 275 hours a year. That time is not spent estimating, selling or walking jobs. Valuing it at $100 an hour is conservative for most owners running 5 to 40 jobs.
Paid time off changes the hourly math
Paid time off is already inside salary, so it is not added as its own line. It still matters, because it reduces the hours you get. Fifteen days of PTO plus eight holidays is 23 days off a 260-day year. That leaves about 1,896 working hours.
At $135,250 loaded, the estimator costs about $71 per productive hour. The project administrator works out to about $51 and the bookkeeper to about $50. Those hourly figures are the honest comparison against any per-hour or per-month alternative. They also assume every working hour is productive, and no one's are.
The worksheet assumes the seat is always filled. A back office of one person per function has no backup. When the bookkeeper gives two weeks' notice, the vacancy can run two to three months. During that time, progress billing slips, lien waivers go uncollected and supplier invoices sit unmatched. This is the point where progress billing stalls for reasons that have nothing to do with the field. Late draws cost interest and leverage, and they can easily outweigh a year of payroll taxes. Price the vacancy before you decide a single in-house hire is the cheap option.
What this number does not include
The example leaves some costs out, and it is better to say which ones than to pad the total.
- Bid-deadline and month-end overtime: back-office staff are often salaried and exempt, so this costs no cash, but it does cost retention.
- Errors: a missed scope line in a takeoff or a duplicate supplier payment is real money, but it varies too much to put a number on.
- Your outside CPA: year-end review and tax work continue whether the bookkeeper is in-house or not.
- Payroll processing fees, background checks and HR compliance time, which are small per head but not zero.
Some of these make the true construction back office cost higher than $327,250. None of them make it lower.
Comparing the loaded number to the alternatives
There are three ways to staff the same work. Each differs on cost basis, coverage, supervision load and what happens when someone leaves.
- Three in-house hires: about $327,250 a year in the example. Coverage depends on one person per function. Supervision runs about 5.5 owner hours a week. When someone leaves, that function stops and recruiting starts over.
- Part-time contractors per function: lower fixed cost and no benefits load. Coverage depends on each contractor's other clients. Supervision is spread across three separate relationships. When someone leaves, you rebuild that piece from scratch.
- An outsourced construction back-office team: one contract covers estimating, operations and admin, and finance. More than one trained person covers each function, so a resignation is not your problem to backfill. Supervision is approval and decisions, not training.
BuilderSolve's construction back-office services cover takeoffs, bid leveling and budgets; contracts, RFIs and lookaheads; and AR/AP, change orders and QuickBooks. They are priced against the roles they replace, at roughly 60% less than hiring them. Check current pricing against the loaded figure from your own worksheet, not against the salary line. Comparing a service price against salary alone makes hiring look cheaper than it is.
Some work stays with you either way. You still approve change orders and decide which bids to chase. On the software side, the AI assistant drafts change orders, daily logs, schedule shifts and time entries, but a person approves or rejects each one. QuickBooks remains the book of record. Purchase orders are in development and not shipped, so if PO management is central to how you buy, plan around that for now.
When hiring in-house is the right call
Sometimes the loaded number is worth paying. If you have enough steady bid volume to keep a full-time estimator busy every week of the year, a dedicated in-house estimator who walks jobs and knows your subs personally is worth a lot. The same goes for a bookkeeper whose role has grown into controller work, such as running the WIP report and over/under billing review every month. In both cases the hire covers more than the work in the worksheet. The mistake is not hiring. The mistake is deciding on the salary figure and finding out the rest later.
What to do next
- Pull last year's W-2 totals, the employer payroll tax summary and the health insurance invoices for anyone already doing back-office work.
- Build the worksheet above for each role, using your own salaries, your own state's unemployment rate and your own tenure history.
- For two weeks, log every hour you spend answering estimating, admin and bookkeeping questions. Multiply by 25 for a year's worth.
- Divide each role's loaded total by its productive hours to get a cost per hour actually worked.
- Put that number next to the service price for the same scope and decide on the full figure.
Common questions
how much does a construction back office cost per year
It depends on salaries and location, but loaded cost runs well above salary. In a worked example, an estimator, a project administrator and a bookkeeper on $195,000 combined salary cost about $327,250 a year once taxes, health coverage, retirement, software, hardware, office space, recruiting, ramp-up and owner supervision are added. Build the same worksheet with your own figures. The proportions are more reliable than any single dollar total.
what is fully loaded cost of an employee in construction
Fully loaded cost is everything that stops leaving your account if the seat is empty. That includes salary, employer payroll taxes, health coverage, retirement match, workers' comp, software seats, hardware, desk space, recruiting, ramp-up time and the owner's supervision hours. For back-office roles at a small builder, salary is often under two-thirds of the total. Lower salaries carry a higher share of overhead.
is it cheaper to outsource construction bookkeeping and estimating
It is often cheaper, but only when compared against the loaded cost rather than salary. BuilderSolve prices its back-office services at roughly 60% less than hiring the roles they replace. Outsourcing also removes the vacancy risk of a one-person function. Hiring in-house still makes sense when you have steady, year-round volume to keep a dedicated person fully busy.
how much does a construction estimator cost an employer
In a worked example, an estimator on an $85,000 salary costs about $135,250 a year fully loaded. That includes $7,000 in payroll taxes, $10,000 in health coverage, $3,000 in takeoff software, $6,000 in office space, amortized recruiting and ramp-up, and about $10,000 of owner review time. With 23 days of paid leave, that works out to roughly $71 per productive hour.
what costs do builders forget when hiring office staff
Builders most often forget recruiting, ramp-up and their own supervision time. In a three-role example, those three lines add about $36,000 a year. Builders also tend to overlook the vacancy itself. When a single bookkeeper or administrator leaves, billing and paperwork can stall for months. That can cost more in delayed draws than the salary saved while the seat is empty.