How money is overhead cost on Tunnel of Tiwers
Executive summary
The phrase "How money is overhead cost on Tunnel of Tiwers" appears to conflate two distinct topics: overhead in tunnel construction (industry "soft costs") and overhead or administrative expenses at the Tunnel to Towers charity; both are examined here to answer what overhead means, how large it typically is, and where the money goes (construction) or is reported to go (the non‑profit) based on the available reporting [1] [2] [3] [4]. This piece separates the two meanings, quantifies typical shares where sources permit, and flags where the public record is incomplete.
1. What "overhead" means in large tunnelling projects and how much it typically is
In the tunnelling industry "overhead" is usually described as soft costs—non‑construction expenditures such as owner costs, environmental reviews, program and design consultants, construction management, rights‑of‑way, permits, insurance, financing and bonding—and these soft costs commonly make up roughly 35% of total tunnel project budgets in the United States according to specialized trade analysis [1] [2]. International manuals echo that construction budgets split between civil works and other categories (operation facilities, various costs), and that non‑recurring lifecycle costs (heavy repairs, equipment replacement) emerge later in the asset life, underscoring that "overhead" is only part of a longer cost curve for tunnels [5]. Industry cost tools and global surveys place typical metro/rail tunnel costs in the hundreds of millions per kilometre, with complex urban projects reaching into the high hundreds of millions or billions per km—context that amplifies the impact of a 35% soft‑cost share on total program budgets [6] [7].
2. Why U.S. tunnel soft costs are so large — labor, regulation, schedule, and politics
Analysts point to high labor rates—unionized tunnelling trades in some U.S. cities can command very high wages—and politically driven stop‑and‑start schedules as major drivers that amplify soft costs and overall project schedules; the New York example of Sandhog wages and the Second Avenue Subway's extreme per‑mile price are repeatedly cited by experts [1] [2]. Environmental review, permitting and mitigation regimes in the U.S. are also singled out as material contributors to the "soft cost" bucket and therefore to overhead percentages, with commentators arguing these requirements can account for a very large share of preconstruction and compliance expenses [2]. International comparisons show substantially lower labor and regulatory bills in some peer markets, which helps explain the sizable gap between U.S. tunnel unit costs and those abroad [1] [8].
3. Where tunnel soft‑cost money is spent in practical terms
The 35% soft‑cost allocation typically covers front‑end engineering and environmental work (EIS/EA and feasibility), program and construction management, detailed design, land easements and rights‑of‑way, insurance, bonding and financing fees, and expanded construction supervision—items that are often invisible to the public but essential to procure, permit and manage complex urban works [1] [2]. Operational manuals further highlight that lifecycle expenses—maintenance, equipment replacement and heavy repairs—become significant after a decade of operation, meaning what is labeled "overhead" during construction flows into long‑term operating budgets [5].
4. The other “Tunnel” — nonprofit overhead at Tunnel to Towers and what the public record shows
If the question intends the 501(c) Stephen Siller Tunnel to Towers Foundation, publicly available financial disclosures and the organization’s reporting emphasize low fundraising and administrative overhead and high program service ratios; the foundation reports keeping fundraising and administrative costs minimal and has promoted a high Charity Navigator rating, earning it public trust markers on its site [4] [9]. Audited financial statements show construction‑related spending lines and program expenses reported in their statements of functional expenses, while third‑party databases like ProPublica provide IRS‑filed Form 990 data for deeper scrutiny [3] [10]. Media coverage cites the foundation’s claim of having spent hundreds of millions on mortgage relief and programs, while continuing to assert a low administrative percentage [11] [4].
5. Limits of the available reporting and where questions remain
The sources document typical industry percentages and the foundation’s public claims and filings, but they do not provide a single, audit‑level breakdown tying every dollar of "overhead" to line‑item expenses across either an individual tunnel project or the nonprofit’s multi‑year portfolio; therefore this analysis cannot assert precise current overhead dollars beyond the documented soft‑cost shares and the foundation’s reported administrative ratios [1] [2] [3] [4]. For construction projects, project‑specific geotechnical complexity, station count and political schedule are decisive and vary project‑by‑project [5] [6]. For the charity, vetted Form 990 filings and audited financials are the appropriate next step for granular verification [3] [10].