What buyers underwrite
in a construction acquisition.

Owners selling a construction company often prepare for diligence the way they would prepare for a tax audit. The instinct is defensive: organize the records, answer the questions, weather the process. That instinct leaves money on the table. Construction diligence is not a tax audit. It is a buyer building a thesis about what your business will earn under their ownership, and every question they ask is a chance to either reinforce that thesis or weaken it.

This article walks through what construction acquirers actually underwrite, in roughly the order they encounter it, and where the price movement happens. Sellers who understand the underwriting model can position the business to support the high end of the buyer's range rather than the low end.

Quality of earnings, construction-style

Every transaction starts with a quality of earnings analysis. In construction, the standard Q of E framework gets adapted in specific ways that matter.

Buyers will normalize EBITDA for owner compensation above market, related-party rent, personal expenses, and one-time items. So far, standard. What gets construction-specific is the treatment of work-in-progress accounting. Buyers will rebuild the WIP schedule themselves and look for two things: over-billings that are running ahead of cost completion (which inflate near-term revenue but reverse later) and under-billings that signal slow change-order collection. Both are real. Neither is necessarily bad. But sellers who can explain the WIP schedule before being asked make the analysis run faster and cleaner.

Buyers also look hard at EBITDA add-backs in construction. Add-backs that work in other industries (one-time legal, ERP implementation) are usually accepted. Add-backs that sellers sometimes propose and that almost never survive include: large project losses framed as "unusual," equipment repairs framed as "non-recurring," and weather impacts on multi-project years. If it has happened twice in the trailing five years, it is not non-recurring.

Backlog quality, not just backlog size

The single most important construction-specific underwriting question is the quality of the backlog. Buyers will not pay for backlog at face value. They will discount it based on what they learn.

The questions that drive the discount: How much is signed contract vs verbal award vs probable-but-not-awarded? What is the gross margin on each project relative to bid margin? What is the customer concentration in the backlog? What is the geographic concentration? What is the contract-type mix (lump sum vs cost-plus vs T&M) and how does that compare to historical mix? What is the average project duration and what does the cash conversion look like?

A $50M backlog of signed lump-sum contracts at bid margin with diverse customers will support a much higher multiple than a $50M backlog where a third is verbal, half is concentrated in one customer, and the contract-type mix has drifted toward riskier structures. Sellers who can present the backlog with this level of segmentation, supported by the WIP, set the anchoring frame for the buyer's analysis.

Bonding capacity and surety relationships

Buyers underwrite bonding capacity as a strategic asset. The questions go beyond "what is your aggregate program." They want to know: who is the surety, how long has the relationship existed, what is the personal indemnity structure, what is the typical single-project limit, how does the surety underwrite this company specifically, and what happens to the program post-close under the proposed ownership structure.

The walk-away risk here is real. Buyers who learn late in diligence that the surety will not continue the program under their proposed structure (or will significantly reduce it) face a choice between restructuring the deal, replacing the surety pre-close, or walking. All three are bad outcomes from the seller's perspective. Engaging the surety partner early, ideally before going to market, is one of the highest-leverage pre-process steps a construction seller can take.

Customer concentration and relationship depth

Buyers want to understand customer concentration, but they also want to understand the depth and durability of each major relationship. The depth question matters more than the concentration question for closely held construction businesses.

A 35 percent concentration in one customer is a red flag on its face. The same concentration in a 25-year repeat customer with multiple active projects, a master service agreement, and relationships at three levels of the customer organization tells a different story. Sellers who can document the relationship depth (project history, key contacts, MSA terms, win rates on bids submitted) move concentration from a discount factor toward a neutral or positive factor.

The risk most sellers underestimate is owner-relationship concentration. If the customer relationship runs through the selling owner, buyers will price in attrition risk regardless of how many projects the customer has done. Building visible second-tier customer relationships before going to market is one of the most valuable pre-process moves.

Key personnel and the second-tier team

Construction is a people business in ways that other middle market businesses are not. Buyers underwrite the depth of the second-tier team explicitly: project executives, senior project managers, lead estimators, superintendents, and field foremen. They will ask for an organization chart with tenure, will interview key personnel during diligence, and will model retention scenarios.

What moves price up: documented succession depth, clear ownership of customer relationships at the project executive level, retention agreements with the top five or ten people, and a track record of internal promotion. What moves price down: a flat org chart that runs everything through the selling owner, recent turnover at the senior project manager level, or signs that the field organization will not survive the change of control.

Buyers also pay close attention to skilled trade labor when it is in-house. Sellers with strong field organizations should be prepared to talk about apprenticeship pipelines, union vs open-shop strategy, average tenure, and recent hiring success.

Insurance, safety, and litigation

Three areas that rarely move price up but routinely move it down: insurance, safety, and litigation history.

Insurance underwriters look at the experience modification rate (EMR), loss runs over five years, and the structure of the insurance program (general liability, workers comp, professional liability for design-build, equipment, umbrella). An EMR above 1.0 will be flagged. An EMR significantly above 1.0 will result in a discount or, in extreme cases, will affect bonding capacity itself.

Safety underwriting goes beyond OSHA recordables. Buyers want to see written safety programs, training records, toolbox talks, incident response procedures, and (for any acquirer with their own safety culture) signs that the target company will integrate. Companies with strong safety cultures should lead with that in materials; companies with weaker programs should plan for the discussion before it arrives.

Litigation diligence in construction is heavier than in most industries. Buyers expect to see active litigation, recently closed litigation, mechanic's lien activity (both filed by the company and filed against it), and a five-year history of contract disputes. Pattern of disputes matters more than any single dispute. Companies with frequent payment fights, frequent change-order disputes, or frequent design-related claims (for design-build) face additional discounts.

Equipment, fleet, and capex

For self-perform contractors, the equipment fleet is a real economic asset and a real underwriting question. Buyers will request a fleet schedule with age, condition, book value, and replacement value. They will compare historical capex to depreciation to understand whether the fleet has been maintained or under-invested. A company that has been deferring capex shows up as deflated EBITDA after normalization.

Owned vs leased mix matters. Heavy ownership ties up capital but supports project margins; heavy leasing preserves capital but adds operating cost. Neither is wrong, but the strategy should be intentional and the buyer should be able to see that it is.

For specialty trades with low equipment intensity, the same logic applies in miniature to tools, vehicles, and shop assets. The principle is the same: under-invested fleet equals deflated EBITDA in the buyer's model, even if it does not show up in the trailing P&L.

Working capital

Construction working capital is misunderstood by buyers who do not specialize in the sector. A typical deal includes a working capital target, usually based on a trailing average. In construction, the "right" target depends on backlog mix, project duration, contract structure, and retention practices. Sellers who do not anchor the working capital discussion early often find themselves negotiating against a target set by a buyer who has applied general-industry assumptions to a construction balance sheet.

The retention asset deserves specific attention. Retention receivables can be 5 to 10 percent of contract value, held until project completion. They are real receivables, but they have long collection cycles. Buyers will sometimes try to either exclude them from working capital (penalizing the seller) or include them at face value without considering aging (which can flatter the seller's position). The right answer is to treat them as a known asset with appropriate aging assumptions, agreed pre-LOI.

Real estate, related-party arrangements, and the operating footprint

Many closely held construction companies operate out of real estate owned by the selling owner personally or by a related entity. This is fine and common. What buyers want to see is a clean separation: an arms-length lease at market rent, a lease term that survives the transaction (typically with the option to extend), and no surprises at close.

Sellers who have not formalized the related-party lease will be asked to do so before close. Doing it before going to market, with documented market rent support, removes a friction point and prevents the question from becoming a negotiation leverage point for the buyer.

Where the retrades come from

A retrade is a buyer's late-stage attempt to reduce price between LOI and close. In construction, retrades come from a predictable set of sources: WIP issues that emerge during deep diligence (over-billings, project losses not previously disclosed), backlog deterioration during the diligence period, surety pushback on the post-close program, customer attrition signals from reference calls, or insurance findings (EMR trending up, a large loss not previously discussed).

The defense is preparation. A clean Q of E pre-process, a backlog schedule with quality segmentation, surety alignment before signing, and proactive disclosure of any known issues all dramatically reduce retrade risk. Buyers retrade when they discover surprises. The fewer surprises, the fewer retrades.

The single highest-leverage seller move

If a construction owner asks what one thing matters most in positioning for sale, the answer is consistent: present the business through the buyer's underwriting model, not through the seller's operating model. The two are not the same.

The operating model is organized around projects, divisions, and operating disciplines. The underwriting model is organized around the questions in this article: Q of E, backlog quality, bonding, customer depth, team depth, safety, equipment, working capital, related parties. Sellers who present the business in the underwriting frame (with materials that anticipate the buyer's analysis) set the anchoring frame for the entire process. Sellers who present in the operating frame force the buyer to translate, which always favors the buyer.

If you are thinking about a sale in the next 12 to 36 months and want to understand what your specific underwriting profile looks like, we will walk through it in a confidential conversation.