Box Elder Peak in the Wasatch Range, Utah, at last light

Licensed Utah General Contractor

Custom Home Builder in Utah

Allegiant Construction is a licensed Utah general contractor for custom homes across Northern Utah. We confirm the schedule, materials, and trades in writing. You have your start date before we set foot on the lot.

What We Build

A Custom Home, in Construction Order

Scope covers site work; foundation; framing; roofing; windows and exterior envelope; plumbing, mechanical, and electrical systems; insulation; drywall; and all interior and exterior finish.

  1. Site Work

    The lot is cleared, staked, and excavated. Sewer, water, gas, and electrical service are brought to the house.

  2. Foundation

    Footings and foundation walls are formed, inspected, and poured, then dampproofed and backfilled.

  3. Framing

    Floors, walls, and the roof structure are framed to the approved plans.

  4. Roofing

    The roof is dried in so the interior work is protected from weather.

  5. Windows and Exterior Envelope

    The weather barrier, windows, and exterior cladding close the house.

  6. Plumbing, Mechanical, and Electrical Systems

    Supply and drain lines, gas piping, heating and cooling ductwork, and electrical wiring are roughed in and inspected before insulation.

  7. Insulation and Drywall

    The envelope is insulated to Utah's energy code. Drywall is then hung, taped, and finished on the interior walls and ceilings.

  8. Interior and Exterior Finish

    Tile and hard flooring, cabinetry, countertops, trim, paint, fixtures, and carpet finish the interior. Final grading and exterior flatwork complete the outside.

Before Ground Breaks

Building on Your Lot

The lot review, the drawings, and the permit are complete before the first stake goes in.

The Lot

Access, Grade, and Utilities

Slope, soils, utility connections, and access are reviewed first, because they shape the foundation and the site work.

Drawings

Drawings and Engineering

We build to your architect's construction drawings, or we commission the drawings and any engineering they call for during preconstruction.

Permits

Approved Before We Mobilize

The permit is secured through the Authority Having Jurisdiction before any work starts on site.

2021 IRC as Adopted in Utah

Utah Building Code for a New Custom Home

A new home in Utah is built to the 2021 International Residential Code with Utah's statewide amendments, under Utah Code 15A-2-103.

Foundation Depth

Exterior footings bear at least 12 inches below undisturbed ground, under Section R403.1.4. They also sit below the frost depth the city, town, or county lists for its area, unless Section R403.1.4.1 allows another method, such as a frost-protected shallow foundation, or exempts a small detached accessory building.

Foundation Anchorage

The sill plates are tied down with anchor bolts of at least 1/2 inch, set at least 7 inches into the concrete and no more than 6 feet apart, or with approved anchors or anchor straps spaced to give equivalent anchorage, under Section R403.1.6. The bolts may be wet-set while the concrete is still plastic. Section R403.1.6.1 adds requirements for a wood light-frame home in Seismic Design Category D0, D1, or D2. They include plate washers on every anchor bolt along a required braced wall line, except where approved anchor straps are used, and an anchor bolt spacing of no more than 4 feet in a building over two stories.

Foundation Drainage

Unless a basement foundation sits on well-drained Group I soils, it gets a perimeter drain at or below the top of the footing or below the bottom of the slab, under Section R405.1. Utah's amendment to the section drops the drain when the property's geotechnical report does not require one.

Slab Vapor Retarder

The basement slab is poured over a vapor retarder at least 6 mil thick with joints lapped at least 6 inches, under Section R506.2.3. Utah's version replaces the model code's 10-mil Class A requirement. The section lets the building official approve leaving the retarder out based on local site conditions.

Radon

Passive radon-resistant construction is voluntary in Utah. When it is used, it follows Appendix F of the residential code, under Utah Code 15A-3-206.

Floor Framing

Utah deletes Section R302.13, the model code's requirement that floor framing such as I-joists over an unfinished basement be covered on its underside with gypsum board or a wood structural panel.

Snow and Structure

Utah publishes ground snow loads for selected cities and towns in its amendments, with the Utah Snow Load Study for other locations, under Section R301.2. Structural elements beyond the code's prescriptive limits are engineered, under Section R301.1.3.

Stairs

Stairs are built with risers of no more than 8 inches, treads at least 9 inches deep, and at least 6 feet 8 inches of headroom, under Utah's version of Section R311.7.5 and under Section R311.7.2.

Egress

Every bedroom, habitable attic, and basement has an emergency escape and rescue opening that opens directly to a public way, a yard, or a court, under Utah's version of Section R310.1. The section's exceptions include a basement bedroom in a home with a Section P2904 sprinkler system, provided the basement has two means of egress, or one means of egress and one escape opening.

Exterior Inspections

Utah adds an inspection of the weather-resistant exterior wall envelope and its flashings to the inspections the code already requires, such as the foundation, rough-in, framing, and final inspections, under Section R109.1.5.1.

Wildland-Urban Interface

From January 1, 2027, Utah Code 15A-2-103 adopts the 2024 International Wildland-Urban Interface Code, replacing the 2006 Utah Wildland Urban Interface Code. We confirm with the office that issues the permit how the new code applies to the lot.

Secondary Irrigation

Where a pressurized irrigation system has a culinary water backup, Utah requires a reduced pressure principle assembly directly downstream of the potable connection and a dual source connection beyond it, under Section P2910.5. The arrangement lets only one source connect at a time. The assembly is tested within 10 days of installation and every year.

Backflow Assemblies

Lawn irrigation is protected by an atmospheric vacuum breaker, a pressure vacuum breaker, or a reduced pressure principle assembly, with no valve downstream of an atmospheric vacuum breaker, under Section P2902.5.3. Where chemicals are introduced into the system, the potable supply is protected by a reduced pressure principle assembly. Utah requires testable assemblies to be tested at installation, after any repair or relocation, and at least annually, under Section P2902.1.1.

Fire Sprinklers

Utah's amendments make residential fire sprinklers optional under the IRC. A system that is installed is designed to Section P2904 or NFPA 13D. A city, town, or county can publish its own sprinkler requirements.

Garage Water Heaters

A water heater with an ignition source in the garage has that source at least 18 inches above the floor, unless the heater is listed as flammable vapor ignition resistant, under Section P2801.7.

Gas Meter Protection

The gas meter and its piping sit in an approved location, or under a structure designed to protect them from physical damage, including falling, moving, or migrating ice and snow, under Utah's Section G2401.2. Any added structure leaves access for service and complies with the IBC or the IRC.

Equipment Sizing

Furnaces, heat pumps, and air conditioners are sized with ACCA Manual S or another sizing method, from loads calculated with ACCA Manual J or another method, under Section M1401.3. The person who calculates those loads has completed the HVAC training Utah's Section M1401.3.1 requires.

Ducts and Ventilation

Ducts outside conditioned space are insulated to at least R-8, though a duct buried beneath a concrete floor needs no insulation, under Section R1104.2. Ducts in an unconditioned attic are leakage tested, under Section R1104.1. A house whose envelope tests at 3 air changes per hour or tighter gets whole-house mechanical ventilation, under Section R1104.1.3.1. Section R1104.1.3.2 accepts mechanical ventilation under Section M1505 in place of that envelope test.

Mechanical Room

A mechanical room that receives combustion air from unconditioned space is insulated and sealed, with a thermal barrier of at least R-13 separating it from unconditioned spaces, under Section R1103 of Utah's energy chapter.

Energy Envelope

Utah's energy chapter calls for prescriptive values that include R-21 above-grade walls, R-38 ceilings, R-30 floors over unconditioned space, R-10 continuous or R-13 cavity on conditioned basement walls, and windows at a U-factor of 0.32 or lower. In place of those values, it accepts a REScheck result at least 5 percent better than Utah's 2012 standard or a HERS rating of 67 or better, under Section R1101.3.2.

Insulation Installation

Insulation is installed in substantial contact with the surface it insulates, never compressed where that would reduce its R-value, and verified by inspection before interior finishes, under Sections R1102.3 and R1102.4.

Garage Separation

An attached garage is separated from the house and its attic by at least 1/2-inch gypsum board or equivalent on the garage side, and from any habitable room above it by at least 5/8-inch Type X gypsum board or equivalent, under Section R302.6. The structure supporting the floor and ceiling assembly between the garage and any habitable room above it also gets at least 1/2-inch gypsum board or equivalent. The wall separation does not apply to garage walls perpendicular to the adjacent dwelling unit wall.

Air Leakage

The finished envelope is tested at 50 pascals to no more than 5.0 air changes per hour or 0.25 cubic feet per minute per square foot of enclosure area, under Utah's Section R1105. The tester is a BPI- or RESNET-certified party, or a licensed contractor trained by a blower door equipment manufacturer or through comparable training, and signs a written report for the code official. Under the same section, the house can instead be built to the state's air barrier and insulation checklist.

Smoke and Carbon Monoxide Alarms

Hardwired, interconnected smoke alarms with battery backup go in each bedroom, outside each sleeping area, and on every level, under Section R314. Carbon monoxide alarms go on each level and outside each sleeping area when the home has a fuel-fired appliance or an attached garage with an opening into the house, under Section R315. Where a fuel-burning appliance sits in a bedroom or its attached bathroom, a carbon monoxide alarm also goes in that bedroom.

Sources: Utah Code 15A-2-103; Utah Code 15A-2-103, version effective January 1, 2027; Utah Code 15A-3-202; Utah Code 15A-3-203, energy chapter; Utah Code 15A-3-204; Utah Code 15A-3-205, plumbing amendments; Utah Code 15A-3-206; IRC Chapter 3 as adopted in Utah; IRC Chapter 4, foundations; IRC Chapter 5, floors; IRC Chapter 14, heating and cooling; IRC Chapter 28, water heaters; IRC Chapter 29, water supply.

How We Build

Our Remodeling and Construction Process

Every Allegiant Construction project moves through three phases, from the first measurement to the last punch list item. As your general contractor, we manage the permits, inspections, and schedule in each one.

Design and Preconstruction

We measure your space, produce permit-ready plans, and help you finalize every selection. We set the scope, the schedule, and the contractor's fee in writing and secure permits through the Authority Having Jurisdiction before demolition begins.

Construction

Demolition, framing, plumbing, mechanical, and electrical rough-in, and finishes proceed in sequence, with the work area sealed off and your questions answered the same day. Rough-in and framing pass their inspections before insulation and drywall cover them, and any change goes through a written change order before that work proceeds.

Completion and Closeout

We pass final inspection, walk the finished space together, create the punch list, and complete every remaining item. Your one-year warranty on work and materials begins at substantial completion, and warranty calls come directly to Allegiant Construction.

What It Can Become

What a Custom Home Can Be Built Around

Each of the four directions below is designed around a lot we review before the drawings begin.

Valley Lots

A Home in the Valley

A home on a valley lot is planned around the setbacks, utilities, and design standards of the subdivision or HOA.

Mountain Lots

A Home in the Mountains

A home on a mountain lot is designed to the snow and wind loads for its location and set to the slope of the site.

Generations

Room for More Than One Generation

A second suite or an attached ADU lets two generations share the house with separate living space.

Workshop

A Shop or Oversized Garage

An oversized garage or a detached shop is built with the ceiling height, power, and heating the work needs.

Concept directions for planning, not past projects.

Design Choices

Custom Home Design Choices in Utah

These decisions shape the drawings, the structure, and the systems of a new home. Each is made before the permit set is submitted.

Floor Plan

A rambler with main-level living, a two-story plan, or a home with a walkout basement on a sloped lot.

Basement

A basement finished during construction, or left unfinished with plumbing stubbed and egress windows in place for later.

Garage

A two- or three-car garage, a tandem bay, or an oversized bay with the ceiling height for a trailer or recreational vehicle.

Envelope

The window package, the wall and attic insulation, and the air-sealing approach, each at or above the minimums of Utah's energy chapter.

Mechanical Systems

A furnace or heat pump, air conditioning, a water heater, and whole-house ventilation sized to the plan.

Outdoor Living

A covered patio, a deck, and exterior lighting and power.

How We Price

How Much Does It Cost to Build a Custom Home in Utah?

Most custom homes are built on open-book, cost-plus terms. Actual costs are billed as incurred, with full documentation provided on every draw. The contractor's fee is agreed in writing before work begins and fixed once the contract is signed.

Lot Conditions

A sloped or remote lot adds excavation, retaining, and utility work that a flat, serviced lot does not.

Size and Complexity

Square footage, rooflines, and structural spans set the scope of the foundation and the framing.

Structural Requirements

Engineering for snow and wind loads, long spans, or large openings adds steel, beams, and connections.

Exterior Envelope

Roofing, the window package, and exterior cladding are selected early, because they close the house.

Interior Selections

Tile, hard flooring, cabinetry, fixtures, and lighting are priced from your selections and tracked on every draw.

The cost to build a custom home in Utah depends on the lot, the design and size of the house, the foundation and structure, the exterior envelope, and your selections. We prepare a written, non-binding estimate from the drawings and a site review.

How Cost-Plus Pricing Works
Map of the eight Northern Utah counties Allegiant Construction serves, with West Jordan markedGreatSalt LakeSALT LAKEUTAHWASATCHSUMMITDAVISWEBERMORGANCACHELoganOgdenLaytonSalt Lake CityPark CityHeber CityProvoMorganWest Jordan
Relief: U.S. Geological Survey, The National Map. County lines: U.S. Census Bureau.

Where We Build

Custom Home Building across Northern Utah

We build custom homes on lots in all eight counties. The permit and every inspection go through the building office of the city, town, county, or district where the lot sits.

Custom Home Building in Salt Lake County

Custom Home Building in Utah County

Alpine, Highland, Lehi, Cedar Hills, American Fork, Pleasant Grove, Saratoga Springs, Lindon, Cedar Fort, Eagle Mountain, Vineyard, Orem, Provo, Fairfield, Springville, Mapleton, Spanish Fork, Salem, Payson, Woodland Hills, Genola, Elk Ridge, Spring Lake, Santaquin, and Goshen.

Utah County Permits and Communities

Custom Home Building in Wasatch County

Hideout, Heber City, Interlaken, Midway, Center Creek, Charleston, Daniel, Independence, and Wallsburg.

Wasatch County Permits and Communities

Custom Home Building in Summit County

Henefer, Coalville, Wanship, Silver Summit, Summit Park, Oakley, Peoa, Snyderville, Park City, Kamas, and Francis.

Summit County Permits and Communities

Custom Home Building in Davis County

Custom Home Building in Weber County

Pleasant View, North Ogden, Plain City, Farr West, Ogden Valley City, Harrisville, Marriott-Slaterville, Huntsville, Ogden, West Haven, Riverdale, South Ogden, Roy, Washington Terrace, Hooper, and Uintah.

Weber County Permits and Communities

Custom Home Building in Morgan County

Mountain Green, Peterson, Croydon, Morgan, and Porterville.

Morgan County Permits and Communities

Custom Home Building in Cache County

Lewiston, Cornish, Richmond, Clarkston, Trenton, Newton, Amalga, Smithfield, Hyde Park, North Logan, Logan, River Heights, Mendon, Providence, Millville, Nibley, Hyrum, Wellsville, and Paradise.

Cache County Permits and Communities

Custom Home Building by City and Town

Every County and Community We Serve

What Homeowners Ask

Utah Custom Home Questions

Do you build custom homes in every county you serve?

Yes, in all eight: Salt Lake, Utah, Wasatch, Summit, Davis, Weber, Morgan, and Cache Counties. Each structure is designed to the snow load for its location. The schedule is set around the building season at the lot.

Can you build on a lot I already own?

Yes. A review of your lot is the first step, before the drawings are final.

Who arranges the utility connections for a new home?

We do, as part of site work. We schedule the sewer, water, gas, and electrical connections with each utility provider.

Do I need my own architect?

No. You can bring your own architect, or we assemble the design team during preconstruction. An engineer joins it where the plans call for one.

Do I need a geotechnical report to build a new home?

It depends on the office that issues the permit and on the site. Draper, for example, takes plans for a new home only after the city has accepted a geotechnical engineering report for the property. We confirm the requirement for your lot first.

Does Utah require a radon system in a new home?

No. Utah leaves passive radon-resistant construction to the owner's choice. A system that is built follows the residential code's Appendix F. Because the Utah Department of Environmental Quality reports that one in three Utah homes has elevated radon, the decision is made before the foundation is poured.

Can a new home use secondary irrigation water with a culinary backup?

Yes, with the protection Utah requires: a reduced pressure principle assembly directly downstream of the culinary connection and a dual source connection beyond it. The two water systems are never connected at once.

Does a lawn sprinkler system need backflow protection in Utah?

Yes. The potable supply to lawn irrigation runs through an atmospheric vacuum breaker, a pressure vacuum breaker, or a reduced pressure principle assembly. Where chemicals are introduced into the system, that supply runs through a reduced pressure principle assembly. Utah requires testable assemblies to be tested when installed, after any repair or relocation, and at least once a year.

Are fire sprinklers required in a new Utah home?

Not statewide. Utah's amendments make residential sprinklers optional under the IRC, though a county, city, or town can have its own requirement. We confirm the rule for your address.

What energy code applies to a new home in Utah?

Utah replaces the residential code's energy chapter with its own. A new home meets the chapter's prescriptive insulation and window values, or achieves a REScheck result at least 5 percent better than Utah's 2012 standard or a HERS rating of 67 or better. Its envelope also passes the state's air leakage test at 50 pascals or is built to the state checklist.

Does a new home need a blower door test in Utah?

Yes, unless the house uses both of the energy chapter's alternatives: the state's air barrier and insulation checklist in place of the Section R1105 test, and mechanical ventilation under Section M1505 in place of the Section R1104.1.3 test. The blower door test measures air leakage at 50 pascals. Under Section R1105, a single-family home may not exceed 5.0 air changes per hour or 0.25 cubic feet per minute per square foot of enclosure area.

How are payments made while a custom home is built?

Payments are made through draws as costs are incurred. Each draw request carries the invoices and receipts for the work it covers. Project management and builder's risk insurance are billed at direct cost with no markup.

How long does it take to build a custom home?

A custom home takes longer than a remodel, because design, any engineering it calls for, and permitting come before site work, and weather affects the exterior phases. The schedule is set once drawings and selections are final. We secure the final inspection and the certificate of occupancy from the Authority Having Jurisdiction before you move in.

What We Guarantee

Signature Guarantees

Our Signature Guarantees define a refined construction experience built on clarity, accountability, and disciplined execution from start to finish.

All four are written into every proposal we deliver.

Investment Certainty

The contractor's fee is fixed once the contract is signed and does not change through completion.

Schedule Certainty

Your project schedule is established upfront and actively managed through completion and closeout.

Same-Day Communication

Project-related messages receive a same-day response, keeping communication clear, timely, and accountable.

Progress Reports

Weekly reports, photos, and project updates are delivered directly to you throughout every phase of construction.

Related

Services and Areas Related to Custom Home Building in Utah

How to Start

Request a Custom Home Consultation

Send the project details below to request a consultation.

  1. Send the Details Scope, address, and the schedule you have in mind.
  2. Set a Time A reply to arrange a visit to the property.
  3. Walk the Project A walkthrough, then a written scope, schedule, and estimate.
Phone
801-835-4457
Hours
Sunday through Saturday
7 AM to 6 PM
Based In
West Jordan, Utah
Allegiant Construction

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