Buying a Commercial Mechanical Contractor: Backlog, Work in Progress, Retainage and Bonding
Commercial mechanical contractors install and service heating, ventilation, air conditioning and plumbing systems in offices, schools, healthcare facilities, industrial plants, retail centers and multifamily buildings. Unlike residential service companies, much of their revenue comes from bid projects that last months, carry contract terms written by owners and general contractors and are paid in stages. A company can have strong annual revenue and still face serious risk from a single underbid project, a slow-paying general contractor or a bonding line that cannot support new work.
This guide explains what matters when buying a mechanical contractor with significant commercial project work: backlog, work-in-progress schedules, retainage, bonding, project risk and how lenders evaluate these businesses. How revenue mix affects value in general is covered in our article on revenue mix for HVAC and plumbing companies; this article focuses on the mechanics of project contracting.
How Project-Based Contractors Differ
- Revenue is recognized over time. Many contractors recognize revenue as work progresses, so profit depends on accurate cost estimates to complete.
- Cash lags revenue. Contractors often pay labor and materials before receiving progress payments, and a portion of each payment may be held back as retainage.
- Contracts allocate risk. Terms on change orders, delays, warranties and payment conditions can shift significant risk to the contractor.
- Bonding determines capacity. Many public and larger private projects require performance and payment bonds, and a contractor’s bonding capacity limits how much work it can take on.
Backlog
Backlog is the value of contracted work not yet completed. It gives a buyer visibility into future revenue, but its quality matters more than its size. Review:
- each project’s contract value, remaining value, expected margin and schedule
- the customers and general contractors involved and their payment history
- whether backlog margins are consistent with the company’s historical results
- any projects bid aggressively to win work
- concentration of backlog in one customer or project
Work-in-Progress Schedules
A work-in-progress schedule shows, for each open project, the contract amount, costs to date, estimated costs to complete, percentage complete, revenue earned and amounts billed. It reveals:
- Overbillings: amounts billed ahead of work performed, which represent cash received for work still owed.
- Underbillings: work performed but not yet billed, which may signal billing delays, disputes or cost overruns.
- Fade: projects whose estimated margins decline over time as costs rise, a common warning sign.
Buyers should review several periods of WIP schedules and compare estimated margins at the start of projects with final results on completed jobs. Consistent estimates suggest a reliable estimating process; repeated fade suggests earnings may be overstated.
Retainage
Retainage is a portion of each progress payment held back by the owner or general contractor until the project is complete or a milestone is reached. For the contractor, retainage receivable is earned but uncollected cash. Contractors may also hold retainage from their own subcontractors. Buyers should understand:
- total retainage receivable and payable, and the age of each balance
- conditions for release and any disputes that could delay it
- how retainage at closing will be divided between buyer and seller
Retainage ties up working capital and must be reflected in cash flow planning. Learn more about HVAC and plumbing working capital.
Bonding
Surety bonds guarantee that the contractor will perform the work and pay subcontractors and suppliers. Sureties evaluate the contractor’s financial strength, experience and management, and they often require personal indemnity from owners. In an acquisition:
- the surety must be comfortable with the new ownership and financial position
- owner indemnities may need to be replaced by the buyer
- bonding capacity may change after closing, affecting the company’s ability to bid
- acquisition debt can reduce the equity sureties rely on
Bring the surety into discussions early. A deal that leaves the company unable to bond its usual work can undermine the revenue the buyer is paying for.
Contract and Project Risk
- review major contracts for payment terms, change order procedures, delay penalties and warranty obligations
- identify pending change orders and claims, and how likely they are to be collected
- review warranty periods on completed projects
- understand any disputes with owners, general contractors or subcontractors
- confirm license and certification requirements for commercial work
Deal structure determines who is responsible for projects started before closing. See asset vs. stock purchases for HVAC and plumbing companies.
Service Revenue Within a Mechanical Contractor
Many mechanical contractors also operate a commercial service department with maintenance contracts and repair work. This recurring revenue often has steadier margins and faster payment than project work, and it can stabilize the business between projects. Buyers should evaluate service and project revenue separately.
How Lenders Evaluate Mechanical Contractors
- historical cash flow, adjusted for the timing effects of overbillings and underbillings
- WIP schedules and the accuracy of past estimates
- backlog quality and customer concentration
- receivable and retainage aging
- working capital sufficient to fund project cycles
- surety relationship and bonding capacity after closing
- management depth in estimating and project management
Our guide to HVAC and plumbing loan requirements covers the broader loan package. Project-heavy contractors should add WIP schedules, backlog reports and surety information.
Common Mistakes
- valuing the company on revenue or backlog without reviewing project margins
- ignoring repeated margin fade on projects
- overlooking overbillings that represent cash already collected for future work
- failing to confirm bonding capacity under new ownership
- not allocating retainage and open projects clearly in the purchase agreement
Frequently Asked Questions
What is a work-in-progress schedule?
A report showing, for each open project, the contract value, costs to date, estimated costs to complete, revenue earned and amounts billed.
Why do overbillings matter to a buyer?
They represent cash already received for work the company still has to perform, which affects working capital after closing.
Will the surety continue after a sale?
That depends on the surety’s review of the new ownership and financial position. Early engagement is important.
Financing Mechanical Contractor Acquisitions
US Professional Funding helps qualified buyers finance established HVAC, plumbing and mechanical contractors, including goodwill, vehicles and equipment within the transaction and working capital. Learn more about our HVAC and plumbing acquisition financing.
