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2026 Cost Guide, Washington County

Cost to build a custom home
in Rockville, Utah.

Honest, line-item numbers for a Casteca-quality custom home in Rockville. Per-square-foot, soft costs, lot complexity, and a real example budget for a 4,500 sqft residence.

Mid-Range

$565/sqft

Range

$480 to $706

4,500 sqft Example

$2,542,500

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How we calculate this

Real numbers, no fluff.

The mid-range $565/sqft figure for Rockville reflects what a Casteca custom home actually costs to deliver in this market in 2026, including site work, structure, mechanicals, finishes, landscape, and the soft costs (architecture, engineering, permits, project management). It excludes the cost of the lot itself.

Why is Rockville priced where it is? Washington County labor and freight, prevailing soil conditions, common architectural style, and the typical lot characteristics all factor in. Rockville Bridge, Smithsonian Butte Backway also influence demand and supplier pricing in the area.

Example Budget

A 4,500 sqft Casteca home in Rockville.

Site work and foundation$177,975
Structure, framing, sheathing, roofing$584,775
Mechanical, HVAC, plumbing, electrical$254,250
Windows and doors$203,400
Interior finishes, millwork, flooring$483,075
Kitchen, bath, fixtures, appliances$177,975
Landscape, hardscape, pool, exterior$254,250
Soft costs, architecture, engineering, permits$203,400
Builder fee and contingency$203,400
Approximate total$2,542,500

FAQ, Rockville Costs

Things people ask.

What is the average cost to build a custom home in Rockville, Utah in 2026?
In 2026, a Casteca-quality custom home in Rockville typically lands between $2,160,000 and $3,177,000 for a 4,500 square foot residence, all-in. Mid-range cost-per-square-foot sits at roughly $565 for our standard finish package.
What does that price include?
It includes site work, foundation, full structural shell, mechanicals (HVAC, plumbing, electrical), windows and doors, interior finishes, kitchen and bath fixtures, landscape and hardscape, and all soft costs including architecture, engineering, permits, and project management. It does not include the lot itself.
What raises the cost in Rockville specifically?
Lot complexity is the biggest variable. Rockville sites with significant slope, retaining walls, deep utility runs, or expansive soils often add $80,000 to $300,000 before the foundation pours. Architectural complexity, finish level, and glass packages also move the number meaningfully.
How long does a custom home take in Rockville?
For a typical custom home in Washington County, plan on 14 to 18 months from signed contract to keys. Roughly 3 months of design, 2 to 3 months of permitting, and 9 to 12 months of construction.
Is it cheaper to buy a finished home in Rockville versus building?
Often yes, on a pure cost-per-square-foot basis. The reason owners choose to build is that a resale home almost never matches the floor plan, finishes, view orientation, or quality they actually want. We are happy to walk you through a build vs buy analysis honestly.
Does Casteca Homes work outside of Rockville?
Yes. We build across Washington, Iron, and Kane counties, including St. George, Ivins, Hurricane, Cedar City, Kanab, Springdale, and the surrounding communities. Our flagship studio is in St. George with a second studio in Cedar City.

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Rockville?

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