Aircraft Hangar Construction at Boulder Valley Airports

The door is the hangar. A clear opening of sixty feet or more has to carry its own weight, resist a wind coming off the foothills, and still move when a pilot pushes a button on a January morning. Everything else, from the roof structure to the foundation under the door track, is arranged around that one element. We build aircraft hangars for owners and tenants at the Boulder Valley's general aviation fields, and we start every one by agreeing on the largest aircraft, the door type and the airport's own rules.

Hangars here are usually built on land that a city or town owns and leases, under lease terms that set the footprint, height, materials and sometimes the construction schedule. A tenant who signs a ground lease first and calls a contractor second can find that the building they want does not fit what the lease allows. We prefer to be involved before the lease is signed, so the owner can negotiate the envelope they actually need.

Three airports, three sets of lease conditions

Three public airports shape the demand. Vance Brand Airport in Longmont is city-owned, with a single concrete runway measuring 4,800 by 75 feet, and the city says it has more than 40 acres on the southwest side available for development or expansion. Longmont also reports a preliminary planning study covering utility and drainage infrastructure for that land and a willingness to work with tenants on development incentives. The page does not state zoning, lease rates or utility capacities, so we treat those as items to confirm in a conversation with the city, not as givens.

Boulder Municipal Airport sits on 136 acres about three miles northeast of central Boulder, with an asphalt runway of 4,100 by 75 feet. Reporting says city officials explored closing it in 2024 and that a lawsuit seeking closure by 2040 was dismissed on procedural grounds, with other reports of a later council decision that we have not confirmed. A tenant weighing a long-lived building there should read the lease term carefully. Erie Municipal Airport, town-owned about three miles west of I-25, has a concrete runway listed at 4,700 feet. We build at any of them and look closely at the lease tied to each. Public owners write those leases, and our government and public sector work shows how we deal with them. See also our work around the Vance Brand Airport area and the Boulder Municipal Airport area.

Loads, codes and fire protection for a wide-open roof

A hangar is a wide roof with an enormous opening, and Boulder County's loads do not make it easier. The county sets ground snow loads from its Ground Snow Load Map and takes basic design wind speed from its own Wind Speed Map, with different sources for different risk categories. A hangar with a long clear span collects drifting snow at roof steps and next to adjacent buildings, so the engineer checks drift at every elevation change, and a hangar door that is open when the wind arrives is a very different structure than one that is closed. We ask the engineer to design for both conditions and include the door manufacturer in those meetings.

Which code edition applies is a local question. Boulder County's amendments, effective July 1, 2026, are based on the 2021 International Building Code. Because a city or town owns each of these fields, the municipality's own adopted edition is the likely governing one, and we confirm it: the January 2026 tracker lists Boulder on the 2024 IBC and Longmont and Erie on the 2021 IBC, with updates in motion. Construction near an airport can also involve federal notice and height review, which we raise with the owner at the start. Hangar fire protection is driven by the building's size and use under the adopted fire code, and the suppression system, often foam or a deluge design for large hangars, is chosen with the fire authority well before drawings are final.

Pad, slab, structure and door

For most hangars the scope is straightforward but exacting. We grade the pad and set drainage, place a slab that is flat, sloped to floor drains and reinforced for aircraft wheel loads, erect the structure, and install the door system, lighting, electrical and fire protection. The structure is typically a pre-engineered metal building, a long-span steel frame or a combination, and we compare options in preconstruction. Our pre-engineered metal building experience applies directly, and for hangars that also need overhead lifting for engine work we draw on our crane building work.

Hangar slabs get special attention. A radiant heating system may be embedded to keep the floor warm for maintenance work. Trench drains collect wash water and fuel spills, and an oil-water separator may be required. Slab thickness and reinforcement follow the heaviest aircraft and the jack and tow equipment the operator will use. We coordinate these with the owner's maintenance plan, since a shop hangar is a different building than a storage hangar even when it looks the same from the taxiway.

Working on an airfield

Working on an airfield adds constraints that most sites do not have. Vehicles and cranes cannot cross taxiways without coordination, cranes and tall equipment may need notice because of their height, and fencing and gate access follow the airport's security rules. We build a site logistics plan that identifies haul routes, laydown areas, crane picks and the contact for airport operations, and we share it with the airport manager before mobilizing. A hangar project at a field with active flight operations may need work windows that avoid peak traffic.

Fuel, solvents and paint are common in hangars, and electrical classification near fuel handling requires careful design. We keep fuel-handling and ignition sources separate in the design, specify sealed fixtures where required and verify the final fire alarm and suppression testing with the authority having jurisdiction. Tenants who intend to use the building for maintenance, painting or fuel storage should tell us at the start, because those uses change the fire code occupancy classification and the permit path.

Where the schedule goes

Hangar schedules are short on the structure and long on everything around it. A pre-engineered frame can arrive and go up in weeks, but the lease negotiation, site plan review, FAA coordination where required, and a door system with a long manufacturing lead time can take longer than the steel. We order the door early, often before the permit is issued, because the opening size must be locked and the supplier needs weeks to build it. We also build in time for cold-weather concrete limits and for inspections that must be scheduled around airport operations.

If you are weighing a hangar against a general building, a warehouse or flex light industrial shell may serve some aviation businesses better, such as an avionics shop that does not need to move aircraft. We say so when it is true. For projects that need a site and utility package under the hangar, the trade partners for site development and utilities handle the extension from the street or taxiway to the building.

Considering a hangar at a valley airport?

Tell us the airport, the aircraft you need to house and the door width you expect. We will review the lease constraints, loads and fire protection with you and give you a scope and schedule.

Questions Owners Ask

Should we sign the ground lease before talking to a contractor?

It is better to talk first. A lease usually fixes the building footprint, height and materials, and a building that does not fit the lease can mean an amendment or a redesign. We review the lease terms against your aircraft and your intended use, then give feedback before you sign.

What decides the cost of a hangar more than anything else?

The door and the clear span. A wide opening needs a heavier header and either a bifold, hydraulic or sliding door system with a long lead time, and a long span needs deeper structure to carry snow loads. After that, fire suppression and slab design weigh the most. Square footage of the shell is usually a smaller driver.

Do we need FAA approval to build a hangar?

Construction near an airport can involve federal notice requirements, especially for height, and the airport owner will have its own approvals under the lease. We do not guess which apply. We raise the question with the airport manager and the owner during preconstruction and plan the schedule around the answers.

What fire protection does a hangar need?

It depends on size, use and the fire code edition adopted by the jurisdiction. Large hangars often use foam or deluge suppression, while small storage hangars may have lighter requirements. We bring the fire authority into the design early because the system affects the roof, the power supply and the cost.

Is the Boulder airport a safe place for a long-term building?

Reports say city officials explored closing Boulder Municipal Airport in 2024 and that a lawsuit seeking closure by 2040 was dismissed on procedural grounds, but later statuses were not confirmed. A tenant planning a building with a long payback should discuss the current lease term and the city's intentions before investing.

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