Builder Cost to Build a House: Where the Money Really Goes

If you're an investor pricing a new single-story home in Southeast Florida, you've probably asked a builder for a number and wondered what's inside it. That number is real; it's just not a single cost. It's several costs and a profit rolled into one price. Here's how a builder's price breaks down, where the construction money actually goes, and what changes when you build at real cost on your own lot.

What's inside a builder's price

The best public breakdown comes from the National Association of Home Builders (NAHB), which surveys builders on what makes up the sales price of a typical new single-family home. In its 2024 Cost of Constructing a Home survey, the average price split like this:

Read the table this way: for every dollar you pay a builder, roughly 64 cents builds the house. The rest pays for the land and for running the builder's business, plus the builder's profit. That's not wrong in any way. Builders take on real risk, they carry staff and offices, and they market their homes. But as an investor, you need to know which part of the price is the house and which part is the business around it.

Where the construction money goes, stage by stage

The same NAHB survey breaks the construction cost itself into eight stages. Nationally, interior finishes were the largest piece (24.1%), then major systems rough-ins like plumbing, electrical and HVAC (19.2%), framing (16.6%), exterior finishes (13.4%), foundations (10.5%), site work (7.6%), final steps like driveway and landscaping (6.5%) and other costs (2.1%).

A single-story concrete block home in Florida is built a little differently from the national average (block walls rather than wood framing, for example), so we plan the money in three big blocks. As a guide for your cash flow:

• About 15% of the construction budget goes into the foundation.
• About 30% goes into the block walls, trusses and roof sheathing, the shell of the house.
• About 55% goes from there to the keys: windows and doors, systems, insulation, drywall, kitchen, baths, flooring and finishes.

That last block is where your choices have the biggest impact on the budget. Two investors can build exactly the same plan and end up with very different costs, simply because of the cabinets, countertops, flooring and fixtures they chose, or when they bought them.

Why a builder's price is higher than the cost to build

Smart Builds started from this exact gap. While working as an estimator for a new-home builder in Florida, one of our founders priced his own home and saw how much of the final price sat above the cost to build it. It wasn't the materials, and it wasn't the labor. It was the builder's margin on top that put the house out of reach.

There are three reasons a builder's price sits above the cost to build:

• The business costs ride on top. Overhead, sales commissions, marketing and financing are part of every home a builder sells. In the NAHB survey they come to more than 10% of the price, before profit.
• The profit grows with the price. When a builder's profit is built into every material and every trade, a more expensive house means more profit for the builder, regardless of how long the build takes.
• You don't see the line items. With a single sales price, you can't tell what the block, the roof or the kitchen really cost, so you can't compare one decision against another.

What changes when you build at real cost

With construction management, the construction cost and the management are separated. You own the lot and the project, and we manage the build for one fixed fee. Here's what that means for your money:

• Every trade at real cost. Each subcontractor or supplier sends a quote. You see it in your investor portal with no markup at all, and you fund that amount before the work begins. Once the work is inspected and approved, the bill is paid from those funds.
• One fixed fee. Our fee is set before you sign and paid in four milestone payments, from contract to keys. It doesn't grow when your finishes do.
• Your contingency stays with you. We recommend a 5–10% contingency for the unexpected. It stays in your hands, not ours.

What doesn't disappear: you still need the lot, sealed plans from a licensed engineer, permits and, if you use one, a construction loan. Building at cost isn't free. It just means you see every cost, and the builder's margin comes off the materials and labor. That's why the savings are a range, an estimated 20–30% versus a traditional builder, and not a fixed number. See how construction management at real cost works, step by step.

How to compare a builder's offer with a budget at real cost

Before you decide, put both options side by side, in writing:

1. Compare total cost, not the headline price. Add the lot, plans, permits, the fee and the contingency to the real-cost budget, so you compare the same thing.
2. Check what's included. Ask the builder which finishes are standard and which are upgrades or allowances, and price the same finishes on the real-cost budget.
3. Ask how each one gets paid. A percentage that grows with the cost, or a fixed fee known from day one.
4. Ask for the schedule and the draw schedule. One tells you when each stage happens; the other tells you when you pay. If you're planning around a date, read how long it takes to build a house in Florida.
5. Ask what you'll see during the build. Quotes, bills, photos and cameras: you simply can't control what you can't see.

If the numbers favor building at cost, the next step is to check them against your own project: your lot, your plans and your finishes.