Custom Union home at sunset

Treasure Valley · Idaho

Built around
the way you live.

Custom homes and thoughtfully managed construction, from first sketch to final walk-through.

Start your buildExplore our work ↗
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Union Building Company

A better building experience starts with alignment.

We pair custom craftsmanship with clear communication and experienced project leadership. The result is a home that feels personal—and a process that feels considered.

Meet Union ↗
Bright vaulted great room and kitchen in a Union custom home
Homes with intentionDesign · Detail · Durability

Ways to build with Union

One team. A process shaped around your project.

01

Custom Homes

A fully personalized home, designed around your land, priorities, lifestyle and long-term vision.

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02

Build on Your Land

From site feasibility and utilities to budgeting and construction, we help turn the property you own—or plan to buy—into the right home.

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03

Fee Build

Bring your land, plans and financing. Union provides experienced construction leadership for a transparent, agreed builder fee.

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04

Construction Management

Jobsite oversight, trade coordination and budget accountability for homeowners, investors and development partners.

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Selected work

Designed to belong.
Built to last.

Every Union home responds to a different family, property and point of view.

Large custom home with RV garage
Custom ResidenceElevated everyday living
Warm custom kitchen
Merino ResidenceWarm modern craft
Custom great room with stone fireplace
Merino ResidenceGathered around home
Stone fireplace detail in a Union home

Our approach

Clear decisions.
Fewer surprises.

Great homes come from strong collaboration. We stay close to the details, communicate the next decision before it becomes urgent and keep the big picture visible at every stage.

  1. 01
    DiscoverLand, goals, timing and investment
  2. 02
    PlanDesign, selections and a grounded budget
  3. 03
    BuildConsistent leadership from dirt to details
  4. 04
    LiveA home made for what comes next
Aerial view of a custom home with RV garage

Built by Union

Local experience. Personal accountability.

Union Building Company is a Treasure Valley builder focused on custom homes, distinctive garages and thoughtfully managed residential construction. We bring an owner’s mindset to every decision—because the details matter long after move-in day.

Tell us about your project

Start a conversation

What do you want
to build?

Share a few details. We’ll follow up to talk through the property, your goals and the right next step.

Have a general question? info@UnionBuildingCo.com