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Construction backlog, book-to-bill, and bid margins measure three different parts of contractor health: the work expected in the future, whether new awards are replacing billed work, and the profit a project is expected to produce. Read together, they can show whether growth is durable or hiding cash strain and execution risk. None is a stand-alone health score: a long backlog can contain weak or unfunded work, a book-to-bill ratio above 1 can consume cash before collection, and an attractive bid margin can disappear through cost overruns.
The reliable approach is to define each measure consistently, compare contractors with similar trades and revenue bands, and reconcile the indicators with realized job profit, working capital, collections, and balance-sheet capacity.
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Each metric answers a different management question:
- Backlog: How much future work is expected under the contractor’s own inclusion rules?
- Book-to-bill: During a stated period, did the value of new bookings exceed the value of work billed or recognized?
- Bid margin: At the time of pricing, what gross profit is the job expected to generate after estimated direct costs?
The measures become useful when their definitions, periods, and populations match. A contractor that changes what counts as an award, switches from billed to recognized revenue, or compares a commercial business with a heavy-highway peer can create a misleading trend without changing its underlying operations.
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What does construction backlog mean for a contractor?
Backlog is the value of work a contractor expects to perform in the future, but it is not a GAAP-defined measure. Companies decide whether to include executed contracts that have not started, probable-funded awards, options, low bids without contracts, approved changes, claims, or other categories. Construction Partners’ 2024 Form 10-K, for example, describes backlog as uncompleted work on contracts in progress plus executed contracts not yet started, and says projects may be included when funding is considered probable. It also includes some low-bid/no-contract work. The filing reported $2.0 billion of backlog at September 30, 2024, compared with $1.6 billion a year earlier; those are company-specific figures, not industry targets.
Before treating backlog as “firm work,” split it into categories:
- Signed and funded: Contracted work with an identified funding source and practical notice to proceed.
- Signed but not funded or scheduled: Legally awarded work that may wait for financing, permits, design, or a start date.
- Probable awards, options, or low bids: Potential work that can be delayed, canceled, or lost.
- Change orders and claims: Amounts that may depend on approval or negotiation.
Also examine customer concentration, geographic exposure, cancellation rights, start-date slippage, escalation clauses, and the labor and equipment capacity needed to convert the backlog. A large balance tied to one owner or one delayed project is less resilient than a smaller, diversified book of funded starts.
How do you calculate months in backlog?
Months in backlog converts the backlog stock into a rough revenue-coverage period. The standard calculation used by Moss Adams and Baker Tilly is:
Months in backlog = backlog ÷ (annual contract revenue ÷ 12)
For example, a contractor with $48 million of backlog and $36 million of annual contract revenue has $48m ÷ ($36m ÷ 12) = 16 months of coverage at its historical revenue pace. That does not mean revenue will arrive evenly for 16 months, that every project is profitable, or that the contractor has the cash and staff to execute it.
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Use the same revenue basis each period. Mixing total company revenue with a segment’s backlog, or using a temporary surge year as the denominator, can distort the result. Track both the total and the composition: months of signed/funded work, months of probable work, and months by trade or operating region.
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How many months of backlog should a contractor have?
There is no universal target. The useful benchmark depends on trade, project duration, revenue scale, seasonality, and how the company defines backlog. The 2025 Construction Industry Financial Analysis Report illustrates the range:
| Contractor segment | 2023 months | 2024 months | 2025 months | 2023 gross profit | 2024 gross profit | 2025 gross profit |
|---|---|---|---|---|---|---|
| Commercial, $50m–$100m revenue | 8.6 | 9.4 | 11.9 | 7.70% | 9.05% | 9.47% |
| Heavy and highway, over $50m revenue | 6.7 | 8.0 | 10.4 | 12.41% | 14.35% | 17.27% |
Prices checked November 2026.
These are national averages for the report’s defined segments, not prescriptions. Comparing a specialty subcontractor with a heavy-highway contractor, or a $10 million firm with a $100 million firm, can produce a false alarm. More coverage is helpful only when the work is executable, adequately priced, and financeable.
What is a good book-to-bill ratio for a contractor?
Book-to-bill is usually calculated as:
Book-to-bill = value booked during the period ÷ value billed (or recognized) during the same period
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There is no validated construction-wide “good” cutoff in the cited research. Management should specify:
- Whether “booked” means signed contracts, approved purchase orders, probable awards, or a broader intake measure.
- Whether “bill” means invoices, progress billings, or revenue recognized under the accounting method.
- The period length and whether the comparison is month-over-month, quarter-over-quarter, or trailing twelve months.
- How cancellations, options, unapproved change orders, and pass-through amounts are treated.
A single month can be noisy because awards and milestone billings are lumpy. A trailing trend, supported by signed/funded share and start dates, is more informative. A book-to-bill above 1 for several periods can indicate demand building, but it can also precede a working-capital squeeze if mobilization and procurement happen before customers pay.
What is a bid margin, and how is it different from markup?
Bid margin is the expected gross profit expressed as a percentage of contract revenue before delivery. A consistent definition is:
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Gross margin = (contract revenue − estimated direct cost) ÷ contract revenue
Markup is calculated on cost, not revenue, so the terms are not interchangeable. A 20% markup on $100 of cost produces a $120 price and a 16.7% margin; calling both “20%” obscures the economics.
Include the cost items that genuinely belong in the estimate: field labor, materials, subcontractors, equipment, supervision, insurance allocations, permits, escalation, contingency, and project-specific financing or working-capital costs where applicable. Then compare the original bid with the current estimate at completion and the final job result. The variance shows whether labor productivity, material pricing, subcontractor coverage, schedule assumptions, scope, and risk allowances were realistic.
A high bid margin that repeatedly falls by completion points to estimating or project-control weakness. A lower margin can still be acceptable when cost forecasts are reliable, overhead absorption is understood, and cash turns quickly. The decision is about risk-adjusted return, not the headline percentage alone.
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Working capital is part of the economic cost of a job when the contractor pays labor, suppliers, or subcontractors before collecting from the owner. Billd’s survey reports an average 57-day wait after submitting a pay application in its 2024 National Subcontractor Market Report. In that survey, respondents who accounted for working-capital costs in bids reported an average 14.1% margin, versus 12.7% for those who did not. Its 2025 report lists a 54-day average wait and corresponding reported margins of 15.2% and 11.8%.
These are vendor-sponsored survey associations, not controlled experiments or universal benchmarks. They do not prove that adding a financing line causes a higher margin. They do show why an estimate should model billing frequency, retainage, approval delays, supplier terms, peak cash usage, and the contractor’s borrowing cost instead of assuming invoices convert to cash immediately.
How should you read the three signals together?
Use the combination as a diagnostic, then test the hypothesis against project-level and cash data.
| Observed pattern | Possible interpretation | Next checks |
|---|---|---|
| Backlog coverage rises and book-to-bill stays above 1 | New work is entering faster than it is being billed; demand may be strengthening. | Signed and funded share, start dates, customer concentration, staffing capacity, and whether new bids preserve margin. |
| Backlog is long while gross margin declines | Volume may be masking weak pricing, risk allowances, or execution slippage. | Margin by project, estimate-to-complete changes, claims, change-order recovery, labor productivity, and overhead absorption. |
| Book-to-bill is strong but working capital is strained | Awards may require cash before collections arrive. | Pay-application cycle, retainage, receivables aging, supplier terms, borrowing headroom, and a rolling cash forecast. |
| Bid margins look healthy but completed-job margins miss estimates | Estimating assumptions or project controls may be weak. | Bid-to-final variance, labor hours, procurement commitments, subcontractor coverage, and recovery of changes. |
| Backlog falls while margin and cash improve | The contractor may be rejecting low-quality work, or demand may be weakening. | Award pipeline, cancellations, backlog quality, utilization, and cash conversion. |
These are hypotheses, not automatic conclusions. Validate them over several periods and against comparable contractors. A backlog decline caused by deliberate selectivity has a different meaning from one caused by canceled projects or a shrinking market.
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Which other health checks belong beside these indicators?
Realized job profitability
Review gross profit by project and the direction of estimate-to-complete revisions. A contractor can report a healthy aggregate margin while a few large jobs are deteriorating. Separate original estimate, current forecast, and final result so the organization can see where variance entered.
Cash conversion
Track billings, collections, receivables aging, retainage, disputed amounts, and days from pay application to cash. Accounting revenue is not available liquidity. Long payment cycles can force a contractor to draw on credit or slow new starts even when the income statement looks profitable.
Working capital and liquidity
Compare the cash required to mobilize the committed backlog with cash on hand, unused borrowing capacity, supplier terms, bonding requirements, and the timing of owner payments. Growth can increase cash needs before it increases cash receipts.
Leverage and equity capacity
Backlog and revenue growth must be supported by the capital base. The Moss Adams/Baker Tilly report provides revenue-to-equity and debt-to-equity measures by contractor segment. Use those measures with covenant headroom and bonding capacity rather than treating backlog growth as automatically positive.
Macro and market context
Industry conditions can explain changes in awards without proving anything about one company. Infrastructure Australia’s 2024 report states that Australian industry earnings rose 11.6% and industry value added rose 14.8% in 2022–23. Those are national industry indicators, not a health score for an individual contractor or a benchmark for other countries.
What is a practical monthly review process?
- Freeze definitions. Document what counts as backlog, booking, billing, margin, change order, claim, and funded work. Keep the definitions unchanged unless the report clearly explains a restatement.
- Reconcile the opening backlog. Start with the prior period, add signed additions, subtract revenue recognized or completed work, and separately show cancellations, scope reductions, and foreign-exchange effects where relevant.
- Split quality from quantity. Report signed/funded, signed/unfunded, probable, low-bid, and disputed components. Add start date, expected duration, customer, and project manager for material jobs.
- Calculate coverage and bookings. Compute months in backlog using the chosen revenue denominator and book-to-bill using the same period convention each month or quarter.
- Bridge bid to forecast. For each major project, show original bid margin, current forecast margin, and final margin when complete. Explain labor, material, subcontract, schedule, scope, and financing variances.
- Overlay cash. Map mobilization, procurement, payroll, billing dates, retainage, collections, and debt service in a rolling cash forecast.
- Set action triggers. Examples include a rising share of unfunded backlog, repeated estimate-to-complete erosion, receivables aging beyond contractual terms, or borrowing capacity falling below the cash required for committed starts. Triggers should be tailored to the contractor’s risk tolerance, not copied as universal thresholds.
Why can a contractor have a full backlog and still lose money?
Backlog measures expected volume, not guaranteed profit. Losses can arise from an underpriced bid, productivity below estimate, material or wage escalation, subcontractor default, delayed access, unapproved changes, liquidated damages, claims that never recover, or overhead that grows faster than revenue. If the backlog definition includes probable awards or low bids, some of the reported amount may never become funded work. That is why completed-job margin, cost-to-complete discipline, and cash conversion must sit beside the pipeline measures.
How should owners, lenders, and managers compare contractors?
Compare like with like on six axes: trade and revenue scale; backlog definition and signed/funded share; months of backlog and book-to-bill trend over matching periods; original bid margin versus current forecast and final margin; customer and project concentration; and cash, working capital, equity, and debt capacity. Ask for reconciliations rather than relying on a headline percentage. The same ratio can describe very different risk when one contractor has fixed-price work with thin contingencies and another has reimbursable contracts with escalation protection.
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The strongest profile is not necessarily the contractor with the longest backlog or highest bid margin. It is the one that can demonstrate high-quality, executable work; consistent bookings and billings; estimates that survive delivery; timely collection; and enough liquidity and equity to finance the work until cash arrives.
Key takeaways
- Backlog is future-work value under company-specific rules; verify what is signed, funded, scheduled, and realistically executable.
- Months in backlog provides revenue coverage, not a promise of smooth revenue or profit.
- Book-to-bill has meaning only when bookings, billings, period, and exclusions are defined consistently; no universal construction threshold is established by the cited sources.
- Bid margin is an estimate. The evidence is the movement from original bid to forecast-at-completion and final job profit.
- Payment timing and financing costs can change the economics of an otherwise attractive job.
- Use the three indicators with realized profitability, collections, liquidity, leverage, and peer-appropriate benchmarks.
Frequently Asked Questions
How often should a contractor recalculate months in backlog?
Calculate it on the same monthly or quarterly close used for revenue reporting, then review material project changes between closes. A separate weekly schedule may be warranted when awards, cancellations, or start dates move quickly, but keep the formal denominator and inclusion rules consistent.
Can backlog include contracts that are not signed?
It can, depending on the contractor’s disclosed policy. Some companies include probable-funded awards or low bids, so readers should request a reconciliation that separates signed and funded work from probable, optional, disputed, or otherwise conditional amounts.
Why does book-to-bill swing sharply from one quarter to the next?
Construction awards and billings are often milestone-driven, so one large award or certificate can move the ratio substantially. Seasonality, notice-to-proceed timing, cancellations, and changes in what management counts as booked can also create swings that a trailing-period trend will smooth.
Should financing costs be included in every construction bid?
Include a financing or working-capital allowance when the job’s payment terms, retainage, procurement profile, or borrowing cost creates a material cash burden. The allowance should reflect the contractor’s actual cash forecast and funding terms, not a generic percentage applied without regard to project timing.
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Review the signed contract, funding authorization, notice-to-proceed requirements, schedule, billing terms, change-order language, and evidence that required labor, equipment, permits, and bonding are available. A backlog report alone cannot establish that all of those conditions are satisfied.
