Common Mistakes to Avoid When Building a Custom Home

Building a custom home can offer you the option to create a home that’s tailored to your lifestyle, design preferences and long-term homeownership goals. While custom home construction gives you the flexibility to design your own living spaces, it also comes with additional planning, budgeting and financing decisions.

If you’re exploring the possibility of building a custom home, understanding some of the most common mistakes can help reduce delays, control costs and support a smoother building experience.

What are the most common mistakes when building a custom home?
Common mistakes when building a custom home include choosing the wrong location, underestimating costs, choosing options based on price alone, establishing an unrealistic timeline, failing to understand financing options and planning for the short term without accounting for lifestyle changes and future needs.

Is building a custom home worth it?
Building a custom home might be the right choice depending on your goals, timeline and financial situation. Custom home construction can give you more control over design, layout and finishes. But getting the right result requires finding a financing option that works for you, as well as careful budgeting and planning.

Underestimating the Total Cost of Your Build

When building a custom home, many people make the mistake of focusing primarily on construction costs without considering additional expenses that can increase the project budget by tens of thousands of dollars. While the cost to build a house itself is the largest expense, it’s important to distinguish between construction costs alone and the overall cost to you. To learn more about estimating the costs of building your new home, see our guide on planning a custom build.

Expenses Beyond the Construction Contract

It’s easy to overlook all the added expenses that, along with construction, make up the real cost of building a house. These include:

• Site preparation (including building permit fees, impact fees, utility inspections, architecture and engineering fees): $32,719 on average
• Interior upgrades and finish selections: Varies based on selections and material costs, with an average total of $103,391
• Landscaping: $9,269 on average
• Driveways: $9,635 on average
• Outdoor structures: $4,722 on average
• Clean up: $3,183 on average

Keep in mind that these figures are estimates based on national averages and that the actual costs might vary significantly based on your location, building design, customization preferences and current pricing for materials and labor.

Data sourced from the National Association of Home Builders Cost of Constructing a Home 2024.

Why a Contingency Fund Matters

Building a new home often comes with unforeseen expenses, which is why it’s critical to establish a contingency fund. Since project scope, materials, labor and other costs are subject to change, it’s a good idea to maintain a cushion of around 10% to 15% of the overall cost. When you’re estimating custom home costs, keeping dedicated reserves to cover any unexpected expenses can help you create a more accurate budget and potentially avoid future financial stress.

The cost of building a custom home goes beyond the construction contract. Budgeting for unexpected expenses can help you avoid financial surprises later in the process.

Planning a Home That Doesn't Grow with You

Custom home planning comes with a lot of choices. To avoid making the mistake of designing a custom home that doesn’t serve you over the long term, make sure you consider both current and future home needs. And while you might not know what the future holds, thinking about potential lifestyle changes can help you build a home that grows with you.

Balancing Personalization and Practicality

Designing a custom home is all about striking the right balance between personalization and practicality. Before you finalize your floor plan, think about what you want now and what you might need down the road.

• Family growth: Will you need additional bedrooms and bathrooms? Does an open floor plan offer more flexibility for raising children and entertaining?
• Remote work needs: If you work from home, you may want to think about creating a dedicated office space rather than forcing another space to double as your home office. A well-designed home office might include great natural light, soundproofing and additional electrical outlets.
• Storage requirements: Think about your storage needs, from larger items like cars and bicycles to smaller items like clothes and cleaning supplies. For example, you might want a larger garage, a walk-in closet, or an oversized pantry to maximize storage space.
• Aging in place: Many Americans prefer to retain their independence and control the costs of living by aging in place. This could include single-story living, reducing the number of stairs, wider hallways and doorways and walk-in showers.
• Long-term resale appeal: Even if you don’t plan to sell, you may want to consider your home’s long-term resale appeal. That means avoiding fleeting design trends and opting for a functional layout and a more classic, neutral aesthetic.

Making Too Many Changes After Construction Begins

Once a home builder breaks ground, even small design changes can affect costs and construction timelines. That’s why it’s important to minimize the number of change orders, especially if you’re on a tighter timeline and want to minimize the risk of cost overruns.

Understanding Change Orders

Change orders are formal, written agreements that authorize adjustments to the project scope. A change order may complicate the home construction process, increasing costs and adding to the construction timeline. When you submit a change order, it often involves ordering more materials, adding to your overall costs. In addition, change orders frequently trigger builder fees and markups, since they can create additional administrative work and scheduling challenges.

Do change orders increase the cost of building a custom home?
Yes. Making changes after construction begins can alter the project's scope, increasing costs by thousands of dollars and delaying construction timelines.

Not Fully Understanding the Lot You're Building On

Not all lots are created equal, and in Florida, there are many reasons why you need to fully understand the lot you plan to build on. Even if buying land and building on it is possible, it may not make sense financially. Before you commit to a site for your next home, make sure you thoroughly evaluate the land and ensure it’s somewhere you can realistically build the home you want. Your lot considerations should include a formal assessment of:

• Site preparation costs, including clearing, grading and drainage
• Access to roadways and utility connections
• Environmental restrictions and wetland classifications
• Flood zone designations and base elevation requirements
• Easements and use restrictions
• Local zoning laws
• Soil conditions

For more information and guidance on purchasing land, see Buying Land: Understand Lot Loans, Land Purchases and Property Financing.

Assuming Everything Will Go According to Schedule

Construction timelines are estimates and often change due to variables outside your control. If you’re building a new home in Florida, you shouldn’t assume construction will run on schedule. Instead, set realistic expectations that include more flexibility in your planning. This approach can account for some of the most common causes of construction delays, such as:

• Permitting and municipal approvals
• Inspection scheduling
• Rain, wind and other severe weather conditions
• Labor availability
• Material shortages or supply chain issues
• Change orders

A realistic timeline isn’t about expecting delays. It's about staying flexible and planning for the unexpected.

Treating Financing as an Afterthought

Financing plays a key role in the building process long before construction begins because it directly affects your budget. Starting the financing process early can help you compare your options, establish realistic expectations and align your project budget with what you can afford.

Why Financing Should Be Part of the Planning Stage

Securing financing for your Florida custom home isn’t as exciting as choosing the fixtures and finishes. But unless you’re able to pay for your new home in cash, finding financing should be the first step in your planning process.

Understanding lender qualifications can help you meet any down payment and credit requirements and set realistic expectations for your project’s timeline. So before you get into floor plans and design specifics, make sure you have the financial backing to support your project scope and budget.

Common Financing Options for Building a Custom Home

Two of the most common financing options for building a custom home include construction loans and construction-to-permanent loans.

Construction loans are short-term loans designed to finance the cost of building a home. Unlike traditional mortgages, which pay out a single lump sum for the full amount borrowed, construction loans are paid out in installments as certain milestones are reached, such as completing the foundation and framing or installing fixtures and finishes. These payments are calculated as percentages of the full loan amount and follow a draw schedule included in the loan terms. Since these are short-term loans, you’ll have to pay back the balance at the end of the loan term or take out a new loan once construction is complete.

Construction-to-permanent loans combine a construction loan and a traditional mortgage into a single closing, reducing closing costs. During construction, milestone payments are made as the project progresses. Once the home is fully built, the loan converts to a standard mortgage.

When should you explore financing for a custom home?
If you’re using construction financing, you should start exploring your options before finalizing your plans. Typically, that means exploring a construction loan or a construction-to-permanent loan 6 to 12 months before you break ground on your new home. By getting a head start on financing a custom home, you can understand any qualification requirements, set a realistic budget and find the best option for your needs.

Florida-Specific Considerations for Custom Home Builds

The Sunshine State’s coastal location, limestone subsurface and susceptibility to storms mean Florida construction requirements and building codes are stricter than in other parts of the country. If you’re building a house in Florida, you’ll want to consider:

• Flood zone designations: Two-thirds of Florida counties have an elevated flood risk, which can trigger an elevation certificate requirement and additional grading challenges.
• Hurricane-resistant building requirements: Many Florida construction requirements include specific standards for resisting wind, impacts and flooding, as well as structural reinforcements to strengthen roofing systems.
• Insurance costs: Though new construction homes usually cost less to insure, insurance premiums can still add thousands of dollars to the cost of annual homeownership in Florida.
• Local permitting processes: In addition to Florida’s statewide building codes, local permitting laws introduce another regulatory layer, which may include separate costs and review processes.

Bringing Your Dream Home to Life

Building a custom home can give you an opportunity to create a home that’s tailored to your lifestyle, needs and goals. However, it’s important to remember that custom home planning comes with added responsibilities, and that you’ll need to set realistic expectations around your budget and timeline. By understanding some of the most common mistakes people make when building a new home, you can create a realistic budget, make more informed decisions and avoid unpleasant surprises on your way to building your dream home.

Ready to learn more? Explore Seacoast’s construction financing options or connect with a Mortgage Loan Officer today.