Why a typical build pays for four profits, not one
Design, construction and finish usually sit with three or four separate companies, each pricing its own margin. Building it all in-house removes that stack for a Coconut Grove home, not just the coordination.
Samuel Bissu · Developments
· 5 min read · Last reviewed
Key takeaways
- A typical build usually runs through three or four separate companies, design, general contractor, subcontractors, and a finish company, and each one prices in its own overhead and profit before the next one starts.
- Industry estimates commonly put general contractor markup at 15 to 25 percent on labor and materials, architect fees at 10 to 15 percent of construction cost, and subcontractor overhead as high as half of revenue before profit, and those layers stack rather than replace each other.
- Luxom designs, builds, and finishes every home in-house, so the team named on the drawings is the team on site and the team specifying materials, which removes the handoffs where a separate company's margin gets added.
- Removing the stack is a structural change to who gets paid along the way, not a discount negotiated on the same traditional structure.
- Building a limited number of homes at a time, the way the Ingraham Residence was carried from empty lot to finished home, is what keeps one team accountable for design, build, and finish without spreading the work across outside companies.
From the developer
People assume the money in a build goes into the finishes, the stone, the fixtures, the things you can point to. Mostly it does not. A normal build passes through three or four separate companies before a homeowner ever walks through the door, and each one prices in its own margin before the next one picks up the project.
That is not a criticism of any single company. It is just how the traditional structure is put together, and it is worth naming plainly, because it is the single biggest reason two homes of the same size can carry very different price tags with nothing different to show for it.
Where your money actually goes on a typical build
Start with the sequence most custom homes still follow. An architecture firm designs the house. A general contractor prices and builds it. A layer of subcontractors under that contractor handles structure, electrical, plumbing, and mechanical systems. Often a separate company handles high-end finishes and millwork at the end. Four businesses, four overhead structures, four profit targets, on one house.
Industry estimates for what each layer adds vary by source, but they land in a similar place. One estimate puts general contractor overhead and profit at 15 to 25 percent on labor and materials, with architect fees separately around 10 to 15 percent of construction cost. Another puts a reasonable markup multiplier for a contractor closer to 1.5 times direct cost, with overhead alone running 25 to 54 percent of revenue before any profit is realized. A third, looking specifically at general contractor markup on a project basis, cites 10 to 20 percent on top of direct costs once overhead and profit are combined. None of these numbers are unusual or predatory, and none of them include what a separate finish company or subcontractor layer adds on top. They are simply what it costs to run a business, and in a traditional build, three or four businesses are running at once on the same house.
Every handoff is another margin, and another gap
The cost of a traditional build is not only the sum of those margins. It is also what happens at the seam where one company's work ends and the next one's begins. A design that was priced without a builder at the table gets rebid when it exceeds budget. A subcontractor's work that does not match the drawings gets argued about between the contractor and the architect, with the homeowner in the middle. A finish company that never spoke to the general contractor discovers the substrate was not prepared for what they were hired to install.
Each of those gaps costs time, and time on a build is never free. It shows up as change orders, as rework, as a schedule that slips while two companies decide whose scope a problem belongs to. The margin stack and the coordination gap are not two separate costs. They are the same structure, seen from two angles, and we see the same pattern on renovations, where coordination gaps between separately hired trades are the leading cause of overruns, covered in turnkey whole-home renovation: one team vs. many contractors.
A normal build pays for four profits before it pays for one home
Design, general contractor, subcontractors, finish company. Four separate margins on one house is the default, not the exception.
Design, build and finish under one roof
Luxom runs the opposite structure. Design, construction, and finish sit inside one studio, the same team that draws the home is the team that builds it and the team that specifies and installs what goes into it. There is no handoff where a separate company prices its piece of the project and adds its own margin on top of what came before.
That is a structural difference, not a sales pitch. It means one point of accountability from the first sketch to the final walkthrough, which is the same case we make for design-build generally in architect vs. design-build. It also means the buyer is not underwriting three or four separate overhead structures on the same house, because those functions never left the building.
What removing the stack changes for a Coconut Grove buyer
The clearest way to see this is a home like the Ingraham Residence in Coconut Grove, designed, built, and finished by the same team from an empty lot to a finished house. The stone, the millwork, the systems, and the structure were specified and installed under one plan, not bid out room by room to separate companies after the design was locked.
That does not mean every cost disappears. Land, materials, labor, and code compliance in a hurricane zone are real costs no structure changes, and we break those categories down in an $8.2M development cost breakdown. What changes is which of those costs are paying for the house itself, and which are paying for separate companies to hand work to each other. Removing three or four overhead structures from the chain does not lower the cost of stone or labor. It removes the layers of margin stacked on top of them.
Why we still build a limited number of homes at a time
An in-house model only holds together if the team running it is not spread thin across too many projects. That is why Luxom builds a limited number of homes at a time rather than scaling toward volume, the same discipline behind how craft compounds value once the land is right, which we cover in where luxury developers actually make money. Take on too many projects at once under one roof and you recreate the same coordination problem an in-house team exists to solve, just without the separate contracts to show for it.
Building this way in Coconut Grove is not about promising a lower number than the market. It is about naming, plainly, where the money in a typical build actually goes, and removing the layers of it that have nothing to do with the house. If you are planning a build in Coconut Grove and want to see what that looks like on your lot, reach out through contact.
Pull quote
You are not paying for four profits when one team designs, builds and finishes the home. You are paying for one.
Filed under
Questions about in-house design build cost Coconut Grove
01How much does a general contractor typically mark up a project?
Industry estimates commonly put general contractor overhead and profit at 15 to 25 percent on top of labor and materials, with some sources citing a markup multiplier close to 1.5 times direct cost once overhead, which alone can run 25 to 54 percent of revenue, is counted in. That is one layer. On a traditionally structured build, a separate architect fee of roughly 10 to 15 percent of construction cost, and subcontractor pricing underneath the general contractor, sit on top of it. Luxom removes that structure by designing, building, and finishing every home in-house; see how we work on our services page.
02Why does a normal build pass through three or four separate companies?
The traditional sequence hires an architecture firm to design the home, a general contractor to build it, a set of subcontractors under that contractor for structure and systems, and often a separate company for high-end finishes and millwork. Each of those is a distinct business with its own overhead and profit target, and each one prices its piece before handing the project to the next. None of that is unusual, it is simply how most custom homes get built, and it is why the same square footage can carry a different total cost depending on how many separate margins sit inside it. We walk through how a Coconut Grove build actually runs start to finish in building a custom luxury home in Miami.
03Does building in-house actually cost the buyer less, or is it just more convenient?
Convenience and cost are not separate arguments here, they come from the same structural change. When one team designs, builds, and finishes a home, the buyer is not funding a separate profit target for an architecture firm, a general contractor, and a finish company on the same project, because those functions sit inside one studio instead of three or four contracts. That is a different claim than saying any single company charges below the market rate. It is that fewer companies are being paid to build the same house. Our where luxury developers actually make money covers the other half of this, where the margin gets made on a project before the build even starts.
04Is a single in-house team the same thing as a design-build firm?
It is a stricter version of it. A design-build firm puts design and construction under one contract, which is already a step up from hiring an architect and a contractor separately, a comparison we cover in architect vs. design-build. Luxom extends that same logic through finish: the millwork, stone, and interior detailing are specified and installed by the same studio rather than handed to a separate finish contractor, which is usually the third or fourth company in a traditional chain.
05Does building a limited number of homes at a time change how the in-house model works?
Yes. An in-house team can only stay hands on across design, construction, and finish if it is not spread across too many projects at once, which is why Luxom builds a limited number of homes at a time rather than scaling to volume, the same principle behind the Ingraham Residence going from an empty lot to a finished home under one team. Spreading a small studio across many projects would recreate the coordination problem an in-house model exists to remove. See how that played out on building the Ingraham Residence, start to finish.
Explore the portfolio
Projects to see
Talk to the studio
If this belongs in your home, our studio will draw the plan.
Initial conversation, 30 minutes. We listen to the brief and respond with a scoped proposal within five working days. You can also read the services page for typical timelines and fees.
Written by Samuel Bissu · Developments
Developer and founder of LUXOM Developments, boutique residences in Coconut Grove, Miami
Keep reading
From the journal
Development · Jul 8, 2026 · 2 min
Where luxury developers actually make money
It isn't the house. The margin is decided the day you buy the land, and protected by everything you refuse to cheapen.
Architecture · Jul 29, 2026 · 4 min
Architect vs. design-build: which your project needs
Two ways to build a home in Miami: hire an architect and manage the rest yourself, or hire one design-build team that owns the whole thing. How to tell which fits.
Development · Jul 20, 2026 · 4 min
Turnkey whole-home renovation: one team vs. many contractors
The case for a single accountable team on a whole-home renovation in Miami, and what coordinating many separate contractors actually costs you in time, risk and finish.