The Hidden Burden: How Carrying Costs Are Quietly Draining Developer Profits

The Hidden Burden: How Carrying Costs Are Quietly Draining Developer Profits

Every day a project sits in the permitting phase, developers are bleeding money. Not in dramatic, obvious ways, but through a steady accumulation of costs that can transform a viable project into a financial burden.

Since joining Y Combinator, I've spoken with over 100 developers about their biggest pain points. One pattern keeps emerging: almost everyone underestimates carrying costs. They budget for construction, materials, and labor. All the visible expenses. But the silent killer? Time.

The Real Cost of Time

Carrying costs are the ongoing expenses developers incur while holding a property before it generates revenue. These include loan interest, property taxes, insurance, utilities, and administrative overhead. While individual line items might seem manageable, their cumulative impact over extended timelines can be devastating.

Recent industry data paints a sobering picture. According to Rabbet's 2024 Construction Payments Report, payment delays alone have increased costs by $280 billion across the U.S. construction industry, representing 14% of total construction spending. These delays create a cascade effect, with 82% of contractors now facing payment waits exceeding 30 days, up dramatically from 49% just two years ago.

Breaking Down the Numbers

The mathematics of carrying costs are unforgiving. Construction loans typically carry interest rates between 7.5-9.5% in the current market, according to recent analysis by Primior Group. For a $10 million project, that translates to roughly $62,500-$79,000 in monthly interest charges alone.

But interest is just the beginning. Property taxes, insurance, utilities, and administrative costs compound the burden. Research from the White House Council of Economic Advisers found that each additional month in the permitting process increases building costs by approximately $4,400, or about 1% of total project value. In New York City, a two-year delay for mid-rise development adds an estimated $50,000 per unit.

The Permitting Bottleneck

Perhaps nowhere is the carrying cost crisis more acute than in the permitting process. Current data reveals alarming timelines across major markets:

• 01Boston: 7.5 months median permitting time
• 02Los Angeles: 13 months
• 03Seattle: 16 months
• 04New York City: 30 months
• 05San Francisco: 33 months

These aren't just inconveniences. They're financial killers. A study from Washington state estimated that building permit delays averaging 6.5 months cost homebuyers $35,000, pricing thousands of families out of the market entirely.

Recent analysis shows permit processing times have increased by 45% compared to 2023 in some markets. In Philadelphia, 75% of construction projects faced delays due to permitting issues in 2024. Denver auditors found that permit reviewers failed to complete 76% of residential building permit reviews on time.

Why Don't Developers Price This In?

Here's the question I've asked dozens of developers: if carrying costs are so predictable, why don't you just build bigger buffers into your pro formas?

The answers reveal a deeper problem. First, there's optimism bias. Every developer I've spoken with believes their project will be different. They see the median permitting time of 13 months in LA and think "but mine will only take 6." They're not wrong to be optimistic. It's part of what makes them successful. But it creates systematic underpricing of time risk.

Second, competitive pressure forces aggressive assumptions. When competing for deals or financing, the developer who underwrites 8 months of carrying costs beats the one who realistically prices in 15 months. The market rewards optimistic projections until reality hits.

Third, and most critically, the uncertainty itself is the problem. You can budget for 12 months of carrying costs. But when permitting stretches to 18 months, then 24, your contingency evaporates. The variability is what kills deals. A developer who knows with certainty a permit will take 16 months can price that in. The one facing a range of 8-30 months can't underwrite that risk effectively.

In my conversations, I've heard developers describe this as "death by a thousand paper cuts." Each individual delay seems manageable. Just another month, just another revision cycle. But these delays compound in ways that spreadsheets at deal inception rarely capture. By the time carrying costs become undeniable, capital is already deployed and sunk costs drive continued investment in increasingly marginal projects.

The Compounding Effect

The insidious nature of carrying costs lies in their compounding effect. As projects drag on:

• 01Financing becomes more expensive: Extended loan terms increase total interest paid and may trigger higher rates or additional fees
• 02Market conditions shift: Material costs can escalate 15-25% during extended delays
• 03Opportunity costs mount: Capital tied up in one delayed project can't be deployed elsewhere
• 04Inflation erodes value: With construction costs rising 35.6% since the pandemic began, delayed revenue becomes worth less in real terms

The Associated General Contractors of America found that 53% of firms are experiencing cost-related delays or project abandonments. Nearly two-thirds of respondents reported projects postponed or cancelled in 2023, with 36% stating those developments were never rescheduled.

Risk and Reputation

Beyond direct financial impacts, extended carrying costs create strategic vulnerabilities. Projects that should be profitable on paper fail to pencil out when realistic timelines are applied. Buildern's research indicates that 98% of construction projects in North America face delays, with average project durations extending 37% longer than originally projected.

This uncertainty makes it difficult to maintain competitive positioning. Subcontractors increasingly factor a general contractor's payment reputation into their bidding decisions. 100% of surveyed subcontractors now consider this factor according to Rabbet's report. Delays damage relationships across the entire development ecosystem.

The Path Forward

In my conversations with developers since joining Y Combinator, a consensus has emerged: the carrying cost crisis demands systemic solutions, but individual developers can't wait for policy reform to save their projects.

Some jurisdictions are implementing reforms. Florida's HB 267 requires local governments to approve building permits within 5-60 days depending on project size, with fee refunds for missed deadlines. Los Angeles now mandates approval or rejection of affordable housing developments within 60 days. These are positive steps, but they're far from universal.

For individual developers, the imperative is clear: every day saved in the approval process directly impacts the bottom line. This makes technology solutions that accelerate review cycles not just convenient, but financially critical. The developers who survive the current environment won't be the ones with the best optimism. They'll be the ones who systematically reduce timeline uncertainty.

McKinsey research estimates that reducing the federal permitting timeline by just one year could unlock a minimum of $22 billion in returns on invested capital among projects seeking approvals. The same principle applies at the municipal level — faster approvals mean lower carrying costs, better project economics, and more development activity.

The Bottom Line

Carrying costs aren't an abstract concept or accounting exercise. They're the difference between a project that succeeds and one that fails. In an environment where construction costs continue rising, labor remains scarce, and financing is expensive, the ability to minimize time to approval has become a competitive advantage.

The question isn't whether carrying costs matter. It's how much longer the industry can afford to ignore them.