The 37% Overrun: Why Home Renovation Budgets Fail and How Personal Loans Fund the Difference

If you're planning a home renovation, budget for more than you expect to spend. Last year alone, nearly 2 in 5 renovating homeowners (37%) went over budget, according to Houzz's 2026 U.S. Houzz & Home Study, often due to hidden repairs, scope changes, and market inflation.

Going over budget doesn't have to upend your renovation, though. Here's why costs creep up, where the hidden expenses tend to land, and how personal loans and other financing tools can cover the difference when your budget falls short.

Samantha-Jane Agbontaen, interior designer and founder of House Designer, said that in her experience, overruns fall into two camps: "unforeseen structural or technical issues that could not reasonably have been anticipated, and scope creep that happened gradually without anyone flagging the cost implications." The first can justify financing; the second is usually "a signal to pause, reprioritize and finish the project in phases," she said.

Houzz data identified three common situations and the percentage of homeowners affected by each.

1. Higher product or service costs than expected. (52%).
2. Upgrading to higher-end materials than planned (35%).
3. Expanding the project's scope mid-renovation (31%).

"On average, most renovation projects cost 10% to 20% more than originally quoted," says Cody Schuiteboer, president and CEO of Best Interest Financial. The trap, he notes, is filling that gap "bit by bit, rather than going back to the drawing board and getting a final quote, which leaves some additional buffer."

When you plan a renovation, the number you start with usually isn't the final tab. According to experts like Houzz, some of the biggest surprises tend to be costs not anticipated in the renovation budget. The ones that catch homeowners off guard most often:

• Structural surprises: Failing plumbing, knob-and-tube wiring or asbestos that only turns up once the walls and floors are open and has to be dealt with before work can continue.
• Code-driven system upgrades: An outdated electrical panel or HVAC system that has to be brought up to code mid-job, even when it wasn't in the plan.
• Unanticipated living costs during work: Eating out or having to live elsewhere in short-term housing or storage while a kitchen, bathroom or whole home is out of commission can add up fast. Imagine paying a mortgage bill, renovation loan and extra rent and food on top of it.
• Price swings between quote and build: Materials and skilled-trade labor can cost more by the time the work happens than they did when you got the estimate.

Since more than a third of renovations run over budget, reaching for extra cash to finish isn't a sign of poor planning or a contractor's overreach. Here's what a personal loan offers in this situation:

• Fast access to funds: Applying online is quick, and if you're approved, your money may arrive within 24 hours, so you can pay your contractor and keep the work moving.
• No collateral required: Unlike a HELOC or home equity loan, you don't have to put your home on the line. You repay the fixed-rate loan in monthly installments over a set period, usually between one and seven years.

That said, a personal loan doesn't have to be your first option. "When there's a little more money left in the bank and it doesn't make you stretch your budget too thin, then using the savings is always going to be the cheapest option available," said Schuiteboer.

When savings won't stretch, he often suggests phasing the renovation so homeowners can "get what's necessary done first and postpone the finishing touches until you have the money saved."

If you decide to finance any overrun, make sure you can pay it back and don't borrow more than you can afford. Before applying, compare offers across home improvement loans.

For anything beyond a small balance you can clear in a couple of months, personal loans usually beat credit cards for remodeling. Here's why:

• Cost: Credit cards carry variable APRs that recently averaged 19.19%, while a personal loan's rate is fixed and typically lower.
• Discipline: A personal loan has a fixed payoff date, so the debt is retired on schedule. A line of credit has no end date, making it easy to carry a balance far longer than planned, especially when it's tempting to keep charging for "upgrades" during a renovation.

The cheapest route, of course, is no debt at all. But if you do need to borrow, here's how the options stack up:

At a Glance: Funding Options for Overruns

Not always, says Agbontaen. One of the most common mistakes she sees is homeowners "assuming that going over budget automatically means they need to borrow more money." Given how common it is for a renovation budget to fall short, the first step is to determine whether your gap is one worth financing or pausing by phasing the remaining work.

If you’re thinking of borrowing money to cover a failed renovation budget, first, ask yourself the following questions:

• Why am I over budget? Are the additional costs due to a structural surprise, a change in scope, or new upgrades on my part? "In many cases, homeowners are surprised by how much can be saved through honest prioritization alone," Agbontaen said.
• Does the renovation add a strong return on investment? The National Association of Realtors’ (NAR) 2025 Remodeling Impact Report showed that the biggest returns often come from smaller projects. For example, the report states that a steel front door could recoup 100% of its costs based on NAR’s estimations.
• How much is the full cost of borrowing? Agbontaen said that homeowners should understand the full cost of borrowing rather than focusing only on the repayment. As she said, "renovations are emotional projects, and decisions made under financial pressure are not always the best long-term decisions."
• Should I consider tapping my home’s equity? If you do, you’re not alone. In 2025, more than half of homeowners (54%) used a home equity loan or line of credit for a recent remodel. The downside: That loan or line of credit is secured by your house, so if you can’t pay off the loan covering those renovation costs, you could lose your home.

What’s a home improvement loan?

A home improvement loan or a home remodel loan is an unsecured personal loan used for renovations. You get a fixed-rate lump sum repaid usually over one to seven years, with no collateral required.

What's a better alternative to a high-interest credit card for a renovation?

A fixed-rate personal loan for remodeling typically beats a card's potentially high interest rate (average rate is 19.19%, as per Experian’s latest data) and variable APR. Plus, a personal loan offers a firm payoff date rather than a lingering balance.

Are personal loans for home improvement better than a HELOC?

Not always. A HELOC may be cheaper, but your home secures it and it takes a few weeks to get your money. A personal loan for home improvement is unsecured, and funds are available within 24 hours, but you’ll want to make sure your credit qualifies you for lower rates.

The Bottom Line

Overruns are common in renovations, with 37% of homeowners who renovated last year going over budget. You can protect yourself by building in some cushion and making a plan for extra funds before your contractor starts work.

Taking a loan to complete a renovation can be a useful financial tool, but it has to be used correctly, including paying it off on time for the shortest terms possible, to make the loan affordable, “otherwise, it's a trap that can turn your home from a project into a project forever,” said Schuiteboer.