Boulder and Weld Counties, Colorado Boulder & Longmont

Barndominium Builders in Longmont, Colorado

Longmont straddles the Boulder–Weld county line, and that position is why so many shop-house projects in northern Colorado start with a Longmont address. The city itself is built out in neighborhoods and subdivisions, but farm ground and small acreages open up quickly once you head east toward the Weld side or north of town. We design and build barndominiums for both situations: compact shop-style homes on in-town lots that meet the city's zoning, and larger post frame homes or bolted steel homes on rural parcels outside city limits. Longmont publishes its own structural design criteria, so on a city lot the snow, wind and frost numbers are known before we draw. Outside the limits the rules change with the county, and we check that first. If you are comparing barndominium contractors for land around Longmont, start the survey with the parcel and we will confirm which building office it answers to.

Longmont at a glance

County: Boulder and Weld Counties
Building permit: City or town building department
Local facts on this page: 5, each linked to its source

Tell us about your land

Before you build in Longmont

The local answers that shape a build here, each taken from the office or document that publishes it. Rules change, so we confirm them again against your parcel before drawing.

City or town permitWho issues the permit

City of Longmont Building Inspection (Building Services)

Inside city limits, Longmont's Building Services issues residential permits and schedules inspections through its online Citizen Access portal; residential submittals need two drawing sets. Land outside the city is permitted by the county it lies in. On the Boulder County side that is Boulder County's building department, which does not reach into incorporated cities.

Source: Building - City of Longmont (longmontcolorado.gov)

Two counties: The City of Longmont describes itself as located along the northern Front Range in Boulder and Weld counties, covering approximately 30 square miles at an elevation of 4,979 feet.
Building code in force: Longmont has adopted the 2024 International Codes, the 2024 Metro Cohort Model Code (based on the 2024 International Energy Conservation Code) and the 2025 Colorado Wildfire Resiliency Code, as of 1 July 2026.
Snow, wind and frost criteria: The city's published climatic and geographic design criteria list a ground snow load of 30 psf, a frost line depth of 30 inches, a nominal design wind speed of 110 mph (ultimate speeds set by risk category, 139 mph for Category II) and Seismic Design Category B. These apply inside Longmont only.
City contractor licence: Anyone performing contracting work within the City of Longmont must hold a Longmont contractor licence (Municipal Code 16.48.030). A homeowner may act as general contractor only on a primary residence not intended for rent or resale, and HVAC, electrical, plumbing and framing subcontractors must still be city-licensed.
Roofing requirements: Longmont requires ice and water shield and drip edge at both eaves and rakes on roof replacements, and hail or wind damage covering more than one roofing square (100 square feet) means a full replacement under permit.

Building on land near Longmont

Acreage near Longmont mostly lies east and north of town, where irrigated farms and hobby parcels give room for a shop bay and outbuildings. Parcels there are generally unincorporated, so the permit, septic and well questions go to whichever county holds the land; parcels on the Boulder side face Boulder County's site review and soils rules, while buyers after cheaper, looser ground often cross into [Weld County](/areas/weld-county-co/). Compare both on our [Boulder County page](/areas/boulder-county-co/). For metal building homes out there, our [site preparation](/services/site-preparation/) work plans the drive, pad and utility runs together.

Where we build in this part of Colorado

Boulder & Longmont

What we build in Longmont

Kits, custom plans and turnkey builds. The parcel decides the budget more than the floor area does, so we price against your land rather than a rate card.

Custom Plans

Custom barndominium plans for Colorado: floor plans drawn around your land, snow load and soils, ready for a licensed engineer's seal where required.

Barndominium Kits

Barndominium kits for Colorado land: steel or pole barn shell packages drawn to the snow load your own county or city sets for your elevation.

Turnkey Builds

Turnkey barndominium builds in Colorado: one team from land and permits through well, septic, shell and finishes to a house you move into.

See every service

Have land in or near Longmont? Tell us about the parcel and what you want to build, and we will check it against the local rules before anything is drawn.

Start your build survey

Building in Longmont: questions

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How much does it cost to build a barndominium in Longmont?

It depends first on whether the lot is in town or out on acreage. A city lot has water and sewer at the street; a rural parcel may need a well, a septic system and a long drive, and each of those can outweigh the choice of frame. We quote from your parcel and plan. Our barndominium cost guide explains sourced ranges and cost drivers, and the survey collects what we need.

Do I need a building permit for a barndominium in Longmont?

Yes. Inside city limits Longmont's Building Services reviews the drawings against the 2024 codes, the Metro Cohort energy code and the wildfire resiliency code, then inspects the work. On land outside the city, the county that holds the parcel issues the permit instead. Our permitting service works out which applies and assembles the submittal.

Can barndominium kits be used on land around Longmont?

Yes, once the package is checked against the design loads where it will stand. In the city that means Longmont's published 30 psf ground snow load, 30-inch frost depth and wind criteria; on county land the county's own figures apply. We review kits bought elsewhere or supply barndominium kits drawn for the parcel, with structural sheets sealed by a Colorado-licensed engineer.

Keep reading

What usually comes next once you know what Longmont allows.

Barndominium Cost Guide

Sourced per-square-foot ranges by tier and size, and what moves the number on your land.

Read it

Is a Barndominium Legal in Colorado?

Zoning, septic and who inspects, before you buy the land.

Read it

How Long Does It Take?

From parcel to move-in, and which steps set the clock.

Read it

Sources for this page

The published pages behind the Longmont facts above. Rules change, so check the current version with the office before you rely on it.

Barndominium builders near Longmont

Nearby places we also build in. Across a city limit or a county line the permit office, zoning and septic rules can change, so each has its own page.

Boulder County

Colorado county

Boulder

Boulder County, Colorado

Loveland

Larimer County, Colorado

Weld County

Colorado county

Building in Longmont?

Start with the survey. Tell us where the land is and what you want on it, and we will come back with which office permits it, what it will allow, and a plan to fit.

Start the survey