A high-rise delay can increase project costs and extend the period during which capital is tied up, but its financial effect depends on the cause of the delay, the contract, market conditions, and financing terms. There is no reliable universal dollar amount or percentage for the cost of a delayed high-rise.
What a delay can change financially
A construction delay is first a schedule variance: work or a defined completion milestone happens later than planned. Its financial consequences are related, but they are not interchangeable. Costs may rise because a project takes longer, because its scope or design changes, or because prices and other conditions change while it is being delivered. A delay can accompany some of these costs without being the sole cause of them.
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The delay can also postpone the point when an owner can occupy, lease, sell, or otherwise use the building. That may matter to the project’s business case, but the financial effect depends on the intended use and the agreements involved. The available evidence does not establish a standard revenue loss or completion penalty for high-rise developments.
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- Direct project costs: added or extended work, design revisions, investigations, or other changes may increase the construction budget.
- Financing exposure: when funding remains committed for a longer period, interest or other financing costs may increase, depending on the loan and funding arrangements.
- Timing: a later completion milestone can defer the building’s intended use, while the significance of that shift depends on what “completion” means and on the project’s purpose.
These effects should be assessed separately. A project can experience a schedule slip without every cost category rising in the same way; conversely, its budget can grow for reasons such as scope changes or material prices even when schedule delay is not the only issue.
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What the available figures show—and what they do not
The strongest recent delay figures here come from an audit of New York City Department of Design and Construction (DDC) public capital projects. They illustrate schedule and cost-control issues in that portfolio, not typical outcomes for privately financed high-rise buildings. The other quantified example concerns a public infrastructure project. Keep each figure attached to its population, date, and measure.
| Measure | Reported figure | Scope and qualification |
|---|---|---|
| Projects behind their original schedules | 80% of 1,092 projects | New York City Comptroller’s 2025 audit of DDC-managed projects reaching, or projected to reach, substantial completion after FY2018; status as of April 16, 2025. |
| Average delay among projects identified as late | 1,265 days (about 3.5 years) among 877 projects | Same Comptroller audit and portfolio, measured as of April 16, 2025. The method calculates net delay against the original planned duration. |
| Construction-cost estimate change | $4.14 billion to $4.51 billion, an increase of about $370 million | A sample of 18 large New York City projects in the Comptroller’s audit, status as of August 2025. The sample was incomplete and was not limited to high-rise buildings. |
| Difference in interest estimates | About $400 million | U.S. Government Accountability Office (GAO), 2017: comparison of a 1990 estimate and a 2012 post-authorization change report for the Olmsted Locks and Dam project. This is not a typical high-rise financing cost. |
The figures answer different questions: the first two describe schedule performance in a defined public portfolio, the third compares construction-cost estimates for a small sample, and the fourth concerns interest estimates for one infrastructure project. They cannot be combined into a high-rise delay-cost rate or used to forecast what a particular tower will cost.
A 1997 survey by Kaming and colleagues examined project managers in Jakarta and Yogyakarta. Its abstract identified inflationary increases in material costs, inaccurate material estimates, and project complexity among reported cost-overrun factors. Because the accessible abstract does not establish a generalizable ranking or provide enough detail to quote percentages, those findings should be treated as observations from that study’s setting—not as a global list or current benchmark.
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Planning, scope, and design maturity
Problems that become visible during construction can start before site work. If the scope is not aligned or plans are incomplete, later design development may reveal work that was not adequately defined or estimated. That can lead to redesign, added work, change orders, investigation, or a revised schedule. A date and budget approved before key constraints are understood may therefore be less dependable than their precision suggests.
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The New York City Comptroller’s audit describes weaknesses in planning and design monitoring. A UK government review of megaproject governance discusses immature design and commitments to cost and schedule made too early. These sources support treating readiness and design maturity as risks to examine; they do not establish that every high-rise with an early estimate will overrun.
Site conditions and coordination
Utility information, permits, third-party responses, and unforeseen site conditions can interrupt sequencing or prompt investigation and redesign. A project team may classify a problem as external, but the audit cautions that some issues placed in that category can also reflect insufficient design or readiness. For owners, the useful question is not simply who was blamed: it is whether the relevant information, approvals, and dependencies were identified early enough to support the plan.
Funding, procurement, and market exposure
In its Olmsted Locks and Dam case, GAO identified limited funding, material-price changes, construction method, and contract type among factors associated with the project’s cost and schedule experience. The UK review describes how stop-start funding and unclear ownership of contingency can slow work and raise whole-life cost. These are mechanisms to investigate in a project-specific review, not universal explanations for delay.
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Complexity was one of the cost-overrun factors reported in the Jakarta and Yogyakarta survey abstract. In practice, a complex project may involve many interdependent design, approval, procurement, and construction activities, so a disruption in one area can affect the sequence of others. The cited survey does not provide enough accessible detail to quantify that effect or rank complexity against other causes.
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Why financing costs may continue during a delay
If construction lasts longer, capital may remain committed for longer and interest may accrue for an extended period. Whether it does, and how much it adds, depends on the funding arrangement and the project’s actual draw and repayment terms. A fixed-cost assumption, a lender extension, or a refinancing outcome cannot be inferred from the fact of delay alone.
Relevant terms can include the draw period, maturity date, extension provisions, interest reserves, rate changes, and any refinancing arrangements. Their effects are contract- and market-specific. The available sources do not provide a current, directly comparable statistic for private high-rise loan-extension costs, interest reserves, or refinancing charges, nor do they verify terms for a particular lender, geography, or building. GAO’s roughly $400 million Olmsted figure is a comparison of historical interest estimates for that public infrastructure project; it should not be treated as a proxy for a tower loan.
When reviewing a forecast, distinguish interest already incurred from expected future interest, and identify the assumptions behind each. Ask whether the estimate uses the original schedule, the current forecast, or a changed drawdown plan. The point is to understand which contractual or financial mechanism produces a projected cost, not to apply a generic per-day price to every delayed project.
How to interpret a completion date
A date is meaningful only when its baseline and milestone are clear. “Completion” may refer to substantial completion, practical completion, or final closeout; these milestones are not interchangeable. A current forecast also answers a different question from the original approved date. Comparing a revised forecast only with another revised forecast can hide how far the project has moved from its initial commitment.
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The New York City Comptroller reported that DDC replaced initial completion dates with updated baselines as projects progressed, making total delay from initiation harder to see. The audit’s schedule analysis compared original dates with actual or projected milestones. Its portfolio findings show why a reviewer should ask for both views: the current forecast for managing work ahead, and the original baseline for understanding cumulative change.
For an individual high-rise, establish the precise milestone, the approval date of the baseline, and whether the reported date is actual or forecast. Then check whether later scope changes or schedule resets are displayed as changes from the original plan rather than silently substituted for it.
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Oversight practices can make risks and changes more visible, but they cannot guarantee an on-time finish. The Comptroller’s audit recommends reporting full time and cost overruns from the first baseline and tracking causes. The UK review highlights the consequences of annual-budget constraints, immature plans, and unclear risk ownership. Together, these findings point toward disciplined readiness, funding, and change control.
- Check readiness before committing to a date and budget. Confirm that scope and design are developed enough for the estimate, and that site investigations, permits, utility coordination, and major dependencies are reflected in the plan.
- Keep the original baseline visible. Report schedule and cost variance from the first approved baseline alongside the current forecast. Define the milestone being measured and identify whether each date is actual or projected.
- Classify changes consistently. Record why a cost or date changed, including scope, design, site conditions, approvals, funding, procurement, and market exposure where applicable. Consistent categories make patterns easier to investigate.
- Make risk and contingency ownership explicit. Identify who can approve changes, who controls contingency, and who is responsible for resolving dependencies. Confirm that funding availability aligns with the planned sequence of work.
- Review financing assumptions against the schedule. Compare the construction forecast with draw-period and maturity provisions, and identify what the financing documents say about extensions or other relevant costs. Do not assume an extension is automatic or that its cost is uniform across lenders.
These controls are useful because they clarify the assumptions behind a forecast and expose decisions that can otherwise be obscured by schedule resets or unclear responsibility. They are not a promise that every identified risk can be eliminated.
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How to compare two high-rise project forecasts
When comparing buildings, proposals, or successive forecasts, align the definitions first. A useful comparison puts the following items side by side rather than relying on headline dates or budget totals:
- Schedule: original and current baseline dates, the milestone each date represents, and whether the milestone is actual or projected.
- Budget: originally approved budget and current forecast, with clarity about whether owner or agency overhead is included.
- Funding: source and timing of funds, expected draw period, maturity, and extension provisions.
- Readiness: design status, permits, site investigations, and utility coordination.
- Risk control: contingency amount, assigned risk owner, and authority for approving changes or releasing contingency.
- Market and contract exposure: exposure to material-price changes and the contract’s allocation of cost risk.
These comparison axes follow from the risks identified in the audits and government review. They do not substitute for a project’s own contract documents, financing terms, or cost plan, and they do not establish that any specific contractor, lender, or building will perform in a particular way.
Limits of the evidence for private high-rise projects
The available quantitative examples are public-sector project audits and a public infrastructure case, not a representative sample of privately financed high-rise buildings. The accessible 1997 high-rise survey abstract provides limited factor descriptions but not enough detail for current percentages or broad rankings. No directly comparable private high-rise series establishes an average cost increase, loan-extension charge, or number of days of delay.
Accordingly, use public figures to understand possible mechanisms and the importance of baseline tracking—not as a budget allowance or prediction for a specific development. For a particular building, the schedule, cost forecast, financing documents, and contractual allocation of risk determine the relevant exposure.
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