Cost overrun and the equity gap

A deal absorbs added construction cost until revised cost to complete exceeds the funding that can still be drawn or contributed. The first cushion is the unspent contingency, and the cushion widens or narrows with undisbursed debt and uncalled equity. Past that point every further dollar of overrun is an equity dollar, because the debt commitment is fixed. A positive projected profit does not change this, since profit arrives after the bills.

The gap is revised cost to complete minus usable funding

The test has one line of arithmetic. Revised cost to complete, meaning every unpaid cost needed to reach the completion condition being tested, minus the funding that can actually be used to pay it. A positive result is an unfunded completion requirement. It becomes an equity requirement when no additional debt or other source covers it.

The completion condition matters as much as the arithmetic. Development underwriting estimates returns from construction costs, lease-up velocity, occupancy, rents, operating expenses, capital costs and future competition. A model that stops at physical completion answers a narrower question than a model that carries the project through lease-up, even when both get the construction math right.

Spent cash cannot pay another invoice.

Usable funding is what remains to draw or call: undisbursed debt that the lender will actually advance and committed equity that has not yet been contributed. Any unspent project cash adds to that. A loan commitment counts once, as the undisbursed balance. Counting the original face amount and the balance together double counts every dollar already drawn.

The test also runs on two clocks. The aggregate clock asks whether total remaining funding covers total remaining cost. The timing clock asks whether funding is on hand when each payment falls due. A project can pass the first and still face a cash shortfall before the next advance or capital call, and development risks such as approvals, lease-up, construction timing and access to construction and permanent financing can each move the answer on either clock.

Contingency absorbs an overrun once, and rising-cost allowances need their own line

An unspent contingency is the first thing an overrun consumes. When a cost increase is charged against it, the approved total budget stays the same and the remaining cushion falls by the same amount. A contingency can be used only once.

A development underwriting can carry a 5% construction contingency, say $2.5 million, and a separate $1 million allowance for rising construction costs, so that the deal can be tested against price volatility. Two labels create two cushions only when two separate dollar amounts sit behind them. If the revised estimate already includes the expected increases, charging them to the reserve a second time understates capacity. If the estimate excludes them while the reserve is shown as fully available, capacity is overstated.

A cost stress can be built by raising cost inputs while holding price outputs flat. That design isolates what higher construction expense does to funding, because no assumed increase in sale proceeds is allowed to pay a bill that falls due earlier.

An allowance unreconciled to the estimate makes the cushion a guess.

A fixed maximum price for construction covers the scope written into that contract. Some sponsors require one before approving a deal. Financing carry, soft costs, owner changes and completion timing sit outside the priced scope, so a cost stress test needs a bridge from the priced work to the whole remaining project obligation.

“Conservative underwriting assumes higher cost inputs but no change in price outputs.”

Worked example: a $60 million ground up project with a 4% and a 10% overrun

The hypothetical project has a $60 million approved budget: $50 million of construction, $7.5 million of other project costs and a $2.5 million contingency. The contingency equals 5% of the construction line. Funding is $36 million of committed debt plus $24 million of committed equity, which also totals $60 million.

At the measurement date the project has paid $42 million, funded $25 million from debt and $17 million from equity. Undisbursed debt is $36 million minus $25 million, or $11 million. Uncalled equity is $24 million minus $17 million, or $7 million. Remaining funding is therefore $18 million.

Scheduled costs before any contingency equal $50 million plus $7.5 million, or $57.5 million. Subtracting the $42 million already paid leaves $15.5 million still to pay. The cushion is $18 million minus $15.5 million, or $2.5 million, which equals the full contingency because none has been used.

Both cases use the same debt, equity, other costs and completion period. The debt is assumed fully drawable for the remaining work, and only the added construction cost changes.

Base case: added construction cost of $2 million, which is 4% of the construction line. Revised cost to complete is $15.5 million plus $2 million, or $17.5 million. Against $18 million of remaining funding the cushion is $0.5 million, so no additional equity is needed. The cross-check agrees: paid costs of $42 million plus $17.5 million to complete make total cost $59.5 million. Less $36 million of debt, equity needed is $23.5 million, and the $24 million commitment covers it with $0.5 million to spare.

Stressed case: added construction cost of $5 million, which is 10% of the construction line. Revised cost to complete is $15.5 million plus $5 million, or $20.5 million. Remaining funding of $18 million leaves a gap of $2.5 million. The cross-check: total cost is $42 million plus $20.5 million, or $62.5 million. Less $36 million of debt, equity needed is $26.5 million, which is $2.5 million above the $24 million committed. That gap equals 10.42% of the committed equity.

The absorption limit is the cushion itself: an added construction cost of $2.5 million, which is 5% of the construction line, takes remaining cost to $18 million and the cushion to zero. In the stressed case the 10% overrun consumes the 5% contingency and the other half lands on equity. Total cost of $62.5 million is also $2.5 million over the $60 million approved budget, the same number, because funding was sized to the budget.

Why borrowing level decides how the same overrun lands on equity

With the debt commitment fixed, an overrun cannot be financed by the lender. Every dollar past the cushion falls on equity, so the gap is a dollar amount first and a percentage second.

High borrowing makes the percentage worse. In the example, a gap of $2.5 million is 10.42% of the committed equity of $24 million. The same gap on a project with a thinner equity commitment is a larger share of what the investors put in, and a gap that cannot be funded exposes the deal to foreclosure and permanent loss of the invested equity.

Two capital structures that share a budget therefore respond differently to the same cost surprise. The one with more committed equity has a bigger pool still to call, and the one with less reaches an extra call sooner.

Completion stage and credit support change the funding test

Percent complete measures physical progress on one basis. It does not price the unfinished work or count the funding left. In a halted condominium project, construction stopped at 80% complete and the borrower estimated that another $10 million was still needed to finish.

The stage of the deal shifts the exposure. Before construction, the contingency is tested against the full estimated scope. During construction, paid costs leave the requirement and committed changes become defined obligations. During lease-up, slower absorption can lengthen the period that needs funding after physical completion. Development risks such as entitlement, permits, contractor solvency and defects enter the test only when they change remaining cost or the funding that can be used.

Credit support takes several forms. A development-fee holdback keeps an amount otherwise payable inside the project. Cost-overrun support allocates responsibility for added costs to a party. A completion guarantee is an obligation to finish the work. None of these is project cash sitting in an account, and each needs its own bridge to the gap: what it covers and when the money arrives.

Mistakes that hide the construction equity gap

Counting the original contingency as untouched overstates capacity. Once identified changes consume part of it, the usable cushion is the unallocated balance. In the example the full $2.5 million is available only because nothing has been charged to it, and the base case leaves just $0.5 million.

Applying the overrun percentage to the wrong base changes the answer. A 10% overrun on the construction line is $5 million. Measured against the full $60 million budget the same cost reads far smaller, and the $2.5 million that lands on equity is 5% of the construction line but 4.17% of the budget. The construction variance has to become a dollar amount before it meets the cushion.

Counting the whole loan commitment as future funding double counts what is already drawn. The same slip occurs with equity commitments that are not reduced by contributions already spent. The remaining funding in the example is $18 million, against $60 million of original commitments.

Treating projected profit as completion liquidity confuses a residual with a payment source. Profit is what remains after costs are deducted from proceeds, and proceeds arrive after the construction invoices. The gap sits in the interval between them.

Treating completion support as cash on hand hides a timing problem. Stress tests that move only price and leave financing costs and completion timing unchanged, as the example does, measure the price component alone. A stress that also delays completion changes the remaining costs and funding assumptions together.

Checklist questions for sizing the equity gap

Which completion condition does the cost to complete cover? Physical completion and funding through lease-up carry different remaining obligations.

What is already in the revised estimate? Committed changes and allowances for uncertain costs need separating, with a record of which charges have already consumed contingency.

How much contingency is unallocated? Only the unspent balance can absorb a new increase.

Do the construction contingency and the rising-cost allowance carry separate dollar amounts? Two labels create two cushions only when two amounts exist.

How much committed debt is undisbursed and drawable for the remaining work? The face amount includes dollars that have already paid for completed work.

How much committed equity is still uncalled? Equity already spent cannot pay a later invoice.

When does each funding source arrive? An aggregate surplus can coexist with a shortfall before the next advance.

What does each form of overrun or completion support cover, and when is it performed? The answer sets whether it belongs in the funding total at all.

Does the stress move completion or lease-up timing as well as price? Longer schedules change financing carry and operating costs inside the remaining requirement.

Does the stress hold price outputs flat while cost inputs rise? That design shows how much added cost the existing funding absorbs without relying on higher proceeds.