Custom home cost information is one of the most searched and least honestly answered questions in residential construction. This is our transparent answer: what a custom home at this finish level actually costs in Gwinnett County in 2026, what drives cost at each phase, and what the difference between the tiers actually delivers.
There is no honest single-number answer to the question of what a custom home costs. Cost is a function of size, finish level, site conditions, and the scope of design complexity — and all four of those variables can change the number significantly. What we can provide is a transparent framework for understanding where the money goes, what each tier of investment delivers, and what separates a home like this St. Marlo build from the production and semi-custom homes in the same price range.
The most important thing to understand about custom home cost in Gwinnett County is this: the cost per square foot is the least useful number in the conversation. A 5,000 square foot custom home with a two-story foyer, marble bathrooms, a coffered ceiling, and a statement lighting package costs more per square foot than a 5,000 square foot custom home with standard ceiling heights and production-grade finishes — and delivers a completely different result. The cost-per-square-foot number collapses that difference into a single figure that communicates almost nothing about the actual home.
High-End Production / Entry Custom ($700K – $1.3M): Builder-selected finishes, standard ceiling heights (9 to 10 feet in principal rooms), production-grade cabinets and countertops, conventional window packages, and a standard lighting plan. Strong location value in Gwinnett County. Limited personalization, strong resale floor.
Semi-Custom Luxury ($1.3M – $2.2M): Custom floor plan with meaningful homeowner design input, upgraded ceiling treatments in principal rooms, semi-custom cabinetry, stone countertops, upgraded window and door packages, and a fixture package above production grade. Real personalization within a structured cost framework. The sweet spot for homeowners who want a custom result at a managed budget.
Full Custom Estate ($2.2M – $5M+): Everything specified by the homeowner — custom floor plan, architectural ceiling treatments (coffered, coved, tray), marble throughout, custom metalwork and lighting design, professional kitchen with commercial-grade equipment, a master bath designed as a spa suite, and a project management structure that owns every trade from site work through final punch list. This is the tier at which design intent is fully executed rather than value-engineered.
All-in cost per square foot for the full custom estate tier in Gwinnett County runs $400 to $650+ depending on finish level and structural complexity. Site costs (land, utilities, site prep) are additional.
“The question is not what does a custom home cost — the question is what does the home you want to live in for the next thirty years cost to build correctly. That is a different number, and it is a better question.”
Full custom estate finish level: two-story foyer with statement chandelier, marble bathrooms, coffered ceilings — this is what the investment delivers
How do you provide a cost estimate before design is complete?
We provide a preliminary budget range based on the homeowner’s square footage target, finish level intent, and site conditions before design begins. This range is refined into a detailed pre-construction estimate after the design development phase is complete and all materials are specified. We do not provide single-number estimates before design is complete because they are not meaningful — they are just numbers with no design behind them.
Does building in St. Marlo Country Club cost more than building in other Gwinnett County locations?
The construction cost is the same regardless of the community. What differs is the land cost (St. Marlo lots command a premium) and the HOA architectural review requirement, which adds a pre-construction step but does not change the construction cost. The value of building in St. Marlo comes from the community context — the golf course, the amenities, and the consistent architectural quality of the neighborhood — not from the construction cost itself.
What financing options are available for a custom home build?
Most custom home clients in this price range use a construction-to-permanent loan (a single loan that covers the build period and converts to a permanent mortgage at certificate of occupancy) or a construction loan alongside cash. We work with several lenders who specialize in custom home construction financing and can provide introductions as part of the pre-construction process.
Serving Gwinnett, Forsyth, Hall, Fulton, and Cherokee County homeowners within 30 miles of Duluth, GA.
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