The Hidden Costs of Custom Home Construction in Florida's Luxury Market

Written by:

Steve Marcinuk

Date:

24 Feb 2026

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Building a custom luxury home in Florida can quickly turn from a dream project into a costly ordeal. Unlike traditional home purchases, which typically involve fixed prices and clear deliverables, custom home construction operates under a system that often leaves buyers exposed to significant financial risk, especially in the luxury segment, where cost overruns of hundreds of thousands of dollars are common.

Mike Swanson, who has spent two decades in Naples’ high-end construction scene, has seen this scenario play out repeatedly. After working on custom homes reaching nearly $20 million and consulting on countless projects, he founded Naples Custom Home Cost Consulting to address what he views as a widespread problem: most luxury custom builds in Florida run far over budget, and owners often have little recourse.

The Cost-Plus Contract Trap

At the heart of the issue is the contract structure that dominates Florida’s luxury construction market: the cost-plus-fee contract. In contrast to fixed-price agreements, where the builder commits to deliver a completed home for a set price, cost-plus contracts charge the homeowner for all material and labor costs, plus a builder’s fee, usually a percentage of the total. This means that if costs rise, the homeowner pays the difference, and the builder’s fee increases accordingly.

Swanson estimates that nine out of ten luxury custom home contracts in Florida use this model. He points out that while builders argue they cannot provide fixed prices for highly customized projects with evolving specifications, the financial risk ultimately shifts almost entirely to the homeowner.

“The builder says, ‘I can’t really know what’s going to go into this custom project ultimately. Here’s the deal: I will build it for you for a lower percentage fee than I usually get, but in exchange, you take on all the costs, no matter what they end up being,” Swanson says.

In practice, once the contract is signed, the builder has little incentive to control costs. Any overruns—whether due to design changes, unforeseen site conditions, or rising material prices—are passed directly to the homeowner.

How Budgets Get Blown

Problems often start with the initial estimates. Custom builders, working with incomplete plans or vague specifications, may provide lowball allowances for key components to keep their bids competitive. These allowances rarely reflect the true cost of luxury finishes or complex systems required for high-end homes.

“Builders are empowered to give low pricing, and then owners trust them that it’s accurate, but that’s where the problem starts,” Swanson explains. He notes that the original estimates are often too low, setting the stage for budget overruns as the project progresses.

Large cost increases often occur when owners request higher-end finishes or when allowances for items such as HVAC, windows, or cabinetry prove inadequate. For example, Swanson has seen budgets allocate $50,000 for air conditioning, only for the true cost—once premium equipment and specialized installation are factored in—to exceed $80,000.

Beyond these major line items, dozens of smaller overruns add up. Temporary utilities, equipment rentals, and labor for punch-list items often exceed their allocations, particularly as projects experience delays. Swanson recommends that budgets for custom homes include at least 200 line items to capture these incremental costs. “It’s the combination of those small ones coupled with big ones, and then the time delays that net out to this huge bottom line difference,” he says.

Labor Shortages Drive Up Costs

Labor availability is the single biggest challenge in Florida’s luxury construction sector. The state’s building boom has outpaced the supply of skilled tradespeople, especially for the specialized work required in high-end projects.

“There simply is too much work and not enough blue-collar trade workers to do it,” Swanson observes. While there are plenty of builders willing to take on new projects, finding qualified electricians, carpenters, and finish trades is far more difficult—particularly for jobs that demand a high level of craftsmanship.

This has created what Swanson describes as an “inverted market,” where top subcontractors can pick and choose their projects. Even substantial financial incentives may not secure their time. “Wave all the money you want in front of some of these people—they can almost pick and choose the job. The good, honest ones will tell you, ‘You can’t give me enough money. I don’t have the guys,” Swanson says.

The labor crunch is worsening as older tradespeople retire, and too few younger workers enter the field. This dynamic leads to project delays and higher costs, as builders pay premiums to secure scarce talent.

Material Costs and Market Timing

While headlines often focus on tariffs and material costs, Swanson says material prices have stabilized compared with the volatility seen in recent years. “Right now, we’re in a good time to build,” he notes. “Construction is down because of high interest rates. Subs are hungry. Material prices have leveled off after the initial drama when tariffs first came out.”

Still, the relative stability in materials does little to offset the impact of labor shortages, which remain the primary driver of delays and cost increases in luxury construction.

How Owners Can Protect Themselves

Swanson’s consulting work centers on making builders accountable for their estimates and tracking project costs on behalf of the owner. He emphasizes that most luxury builders deliver high-quality work, but the way contracts are structured leaves too much room for cost escalation without proper oversight.

“It’s not necessarily adversarial, but it’s to make them accountable to their estimates, make sure they get good costs and control that from the owner’s side,” he explains.

In recent audits, Swanson has uncovered significant savings for clients. On one project under $3 million, he identified $150,000 in errors, including duplicate invoices, overcharges, and tax mistakes. The builder credited $125,000 immediately after the audit.

For homeowners, the most important step is careful pre-construction planning and rigorous contract review before signing anything. Swanson advises:

• Review the contract in detail, not just for legal language but for how costs are tracked and approved.
• Demand a detailed, line-by-line budget with realistic allowances for all major items.
• Verify that estimates reflect actual project requirements, not just builder assumptions.
• Check builder references, especially from clients with similar projects.
• Engage a professional owner’s representative or cost consultant to oversee the process from the start.

Swanson warns that relying on attorney review alone is not enough: “Attorneys skim contracts for legal language, but they don’t speak construction either.”

Cost Overruns

According to Swanson, virtually every luxury custom home project in Florida is susceptible to substantial cost overruns. Even for affluent buyers, the financial impact can be significant. “This happens on every job. It’s not an isolated incident. It’s the combination of circumstances that leaves everybody exposed,” he says. “We’re talking about hundreds of thousands of dollars.”

For real estate professionals, understanding these risks is essential when advising clients considering custom construction. The prevalence of cost-plus contracts, ongoing labor shortages, and the complexity of luxury homebuilding all contribute to a landscape where overruns are the norm rather than the exception.

Looking Ahead

The reality is that cost overruns in Florida’s luxury construction market are not rare mistakes; they are predictable outcomes of the current system. Buyers and their advisors must approach custom home projects with a clear understanding that the structure of most contracts and the current labor market create inherent financial risks.

Effective risk management starts before construction begins. Detailed budgets, transparent contracts, and professional oversight can help contain costs, but these protections only work when implemented early. For those willing to invest the time in upfront planning and ongoing oversight, it is possible to avoid the worst pitfalls and bring a custom home project in on budget. For everyone else, the true cost of luxury construction in Florida may be far higher than the price on the original contract.