Construction company valuation: WIP, backlog and bonding
Short answer
Construction companies are harder to value than most because profit is recognized over the life of jobs, not when cash arrives. A good valuation starts with the work-in-progress (WIP) schedule, testing estimated costs to complete and over- or under-billings, then looks at backlog quality, gross margin history by job type, bonding capacity and equipment. Earnings that depend on optimistic job estimates or on the seller's personal indemnity for bonds are risks a lender will price.
Reading the WIP schedule
Illustration, not a real company. One job, percentage-of-completion basis.
| Contract price | $1,000,000 |
| Estimated total cost | $850,000 |
| Cost to date | $425,000 (50% complete) |
| Revenue earned (50% x $1,000,000) | $500,000 |
| Billed to date | $550,000 |
| Over-billing | $50,000 (a liability) |
| If true total cost is $950,000 instead | Job is only 44.7% complete; earned revenue $447,368; over-billing $102,632 |
A 12% miss on cost estimates ($100,000 / $850,000) wipes out two-thirds of this job's profit. That's why valuations of contractors test completed-job history: did past estimates hold?
Checklist
- WIP schedules at each year-end and TTM, tied to the financial statements.
- Closed-job reports: estimated vs actual margin.
- Backlog: signed contracts, margins, timing.
- Surety letter and the bonding program's dependence on the seller.
- Equipment list and appraisal (SBA collateral credit is 80% of orderly liquidation value, or 50% of book).
- Customer and general contractor concentration.
Why reported profit can mislead
Most contractors of any size report on the percentage-of-completion method, so profit depends on management's estimates of the cost to finish each job. Optimistic estimates pull profit forward; when a job runs over, the loss shows up later, often after a sale. That's why a valuation or QoE on a contractor starts with closed-job history: for jobs finished in the last two or three years, how did the final margin compare with the margin estimated mid-job? A company whose estimates have held is worth more than one whose closed jobs consistently fade.
Over- and under-billings in the purchase price
Over-billings are cash collected for work not yet done: the buyer inherits the obligation to finish that work without receiving the cash again. Under-billings are work done but not yet billed: an asset, but only if the estimate behind it is right and the customer pays. A purchase agreement for a contractor should say how WIP is treated at closing, and the working capital target should account for net over-billings; otherwise the buyer can pay full price and inherit unfunded work.
Backlog
Signed backlog supports near-term revenue, but it's only as good as its margins and the company's capacity. A useful backlog schedule shows each signed contract, its value, expected gross margin, start and finish dates, and whether it's bonded. Appraisers discount backlog that's priced thin, depends on one customer, or relies on crews the company doesn't have.
Bonding after the sale
Surety bonding for public and many commercial jobs depends on the contractor's financial strength and, usually, personal indemnity from the owners. When the owner sells, the surety relationship doesn't simply transfer; the buyer needs their own. If the buyer can't obtain comparable bonding capacity, revenue that depends on bonded work is at risk, and the valuation and the lender should both account for that. SBA's Surety Bond Guarantee program helps small contractors obtain bonds and can be part of the plan.
What the lender checks
- WIP schedules tie to the financial statements at each period end.
- Closed-job margin history versus estimates.
- Working capital target accounts for over- and under-billings.
- Buyer's surety letter or plan for bonding capacity.
- Equipment appraisal for collateral credit, and the fleet's replacement needs in the coverage analysis.
- Customer and general contractor concentration in the revenue and backlog.
Buyers can find the buyer's view of pricing in OKtoBuy's guide to buying a construction business. For lenders, the core point is that a contractor's earnings are only as reliable as its estimates, so the closed-job history deserves as much attention as the latest year's profit.
Financing a construction company acquisition
Construction and trade contractors can be bought with SBA 7(a) loans under the normal acquisition rules. Lenders focus on whether earnings are stable across projects (percentage-of-completion vs completed-contract accounting can move profit between years), work-in-progress and backlog, bonding capacity and whether it transfers to a new owner, customer concentration, licensing tied to the seller, and equipment condition.
Contractors can be excellent businesses with lumpy numbers. Lenders want to see through the lumps.
Five things to get right
- Normalize earnings across jobs. Accounting method and timing can shift profit between years. Lenders use the last fiscal year or the two-year average, so a big job in one year can mislead in either direction.
- Work-in-progress. Over-billed jobs mean cash already collected for work not yet done; the buyer inherits the cost. Agree how WIP is treated in the price and working capital.
- Backlog quality. Signed contracts, margins, customer mix.
- Bonding and licensing. Confirm the surety and licensing board positions for the new owner.
- Equipment. Age, condition and replacement needs; collateral at 50% of book or 80% of orderly liquidation value.
Deal checklist
- Three years of returns and WIP schedules at each year-end.
- Backlog report with contract copies for the largest jobs.
- Customer list with revenue share; any customer over 20% flagged.
- Surety letter on bonding for the new owner.
- Equipment list, maintenance logs, appraisal if material.
- License holders and succession plan.
Valuation view: valuing a construction company.
A worked lender view
Illustration, not a real deal. A commercial electrical contractor reports EBITDA of $900,000. Closed-job analysis shows that over three years, final margins came in 2 points below mid-job estimates on average. Applying that fade to the $6,000,000 of revenue recognized on open jobs at year-end lowers earnings by about $120,000. The QoE also finds $80,000 of over-billings not reflected in the working capital target. Adjusted EBITDA for coverage: about $780,000, and the working capital target is raised by $80,000 so the buyer isn't left funding work already paid for.
None of these adjustments is exotic; they come straight from the WIP schedule and closed-job reports. But they turn a deal that looked comfortable into one that needs a closer look at the loan amount, which is exactly what the QoE and valuation are for.
Licences and qualifiers
Many trades require a licensed qualifier for the company to bid and perform work. If the seller is the only licensed individual, the business may not be able to operate after the sale until the buyer or a key employee holds the licence. Lenders should confirm the licensing plan before closing; it affects both value and repayment.
Buyers of contracting businesses should ask for closed-job reports and the latest WIP schedule before agreeing a price; they reveal more about earnings quality than any summary financials, and the lender's QoE will rely on them anyway.
Lenders should also ask how the business wins work: competitive bids, negotiated repeat customers or a few general contractors. The more of the backlog comes from negotiated, repeat relationships at healthy margins, the more weight the valuation can give it.
Finally, check insurance and claims history: warranty and defect claims on completed work can follow the business after a sale, and in a stock purchase they follow the entity directly.
This guide is general information, not legal or tax advice.
Rules and figures were checked against SBA SOP 50 10 8.1 as of October 2026; confirm against the current version before relying on them.
Common questions
What are over and under billings?
Over-billings mean the company has billed more than it has earned on a job (a liability); under-billings mean it has earned more than it has billed (an asset that depends on the estimate being right).
Does backlog add value?
Backlog supports the forecast if it's signed, priced at healthy margins and the company can perform it. Unsigned pipeline doesn't count for much.
What happens to bonding after a sale?
Surety bonding usually rests on the owner's financial strength and personal indemnity. The buyer needs their own surety relationship; SBA also has a Surety Bond Guarantee program for small contractors.
Does backlog count as an asset in the valuation?
Not as a balance sheet asset. Signed, well-priced backlog supports the earnings forecast; appraisers weigh its margins and the company's capacity to perform it.
Does a WIP schedule matter for an SBA loan?
Yes. It shows over- and under-billing and job profitability, which affect both earnings quality and working capital at closing.
Related guides
Sources
This guide explains rules and practice in plain English. It isn't legal, tax or credit advice, and SBA and IRS rules change. Check the current SOP, regulations and your lender's requirements before you rely on anything here. Examples with made-up businesses are illustrations, not real deals.