Adding 200,000 square feet to a distribution center that ships every night is mostly a question of where the trucks go while the wall comes down. The addition has to attach to a building that is full of inventory, active racking, running conveyors and a fire protection system that cannot be impaired for long. Outbound volume does not pause for a construction schedule, so the plan starts with the operations calendar and works toward the structure.
Distribution expansions fall into a few types. An end-wall addition extends the building in line with the existing racking, a side addition adds dock positions along the truck court, and a multi-level addition builds up where land is scarce. Each one changes the traffic pattern, the fire water demand and the electrical load. We evaluate which is feasible on your site before design hardens, using the existing structure, the utility capacity and the yard geometry as constraints.
The Front Range has seen large multi-level and high-volume facilities. A three-level fulfillment center of 855,000 square feet (2.4 million square feet of floor area) was announced near I-25 and 144th Avenue in Thornton with 1,500 full-time positions. A building like that grows by adding floor area on parcels already assembled, so the expansion path, whether horizontal or vertical, is often set in the first design.
What the existing building constrains
The first survey covers the structural frame, the slab, the roof and the utilities. Column spacing and clear height determine whether racking can run continuously through the new space. The slab joint pattern and flatness at the connection control how material handling equipment crosses from old to new. The roof structure decides how the new roof ties in, and the roof drainage must work as a combined system. Where the existing building was designed with a removable end wall, the work is simpler, and we look for that first.
Utilities are often the limiting item. A fire pump and water supply sized for the original building may not serve the addition without upgrades, and electrical service may need a new transformer or switchgear. We check capacity early and talk to the utilities. For the underground work, our phased construction on occupied sites method keeps the plant's utilities running during tie-ins.
Shutdown windows and the peak season
Distribution operators have blackout periods when no disruptive work is allowed, typically in the peak fulfillment season. We plan structural work, roof tie-ins and utility cutovers around those periods, and we schedule the riskiest tie-ins for the windows the operator can spare. Each cutover has a written procedure, a rollback plan and a named owner for every step. If a window is lost to weather, the plan has to show the next available date.
Procurement follows the same logic. Racking, conveyors and dock equipment arrive on the vendor's schedule, and we sequence the building so the slab is ready when they are. A new E-470 interchange at Exit 22 in Aurora opened on June 28, 2024 at a cost of $87 million, serving the roughly 4,000-acre Aurora Highlands development, and corridors like that attract building growth that expands in steps. Our warehouse shell construction process anticipates those steps so the first building is designed with the next in mind.
The pieces of the addition
An expansion has several packages that run side by side: site and yard, foundations, slab, structure, envelope, roof, fire protection, electrical, mechanical and dock equipment. The tie-in package is the most delicate. It includes demolition of the common wall or the removal of dock doors, patching the roof, extending the sprinkler system and bringing the slab into alignment. We carry the tie-in as its own scope with its own safety plan.
Racking and automation may be installed by a separate vendor, and we coordinate its schedule closely. Mezzanines and elevated sortation floors often accompany an expansion, and our work on mezzanines, catwalks and platforms shows how these structures combine with the building. If the expansion includes a taller bay for new racking, the structural implications are covered under high-bay crane-ready buildings.
Working beside live operations
Forklift traffic, trucks and construction share the site, so we separate them. The construction area is fenced and separated from the operating building with a dust-tight, fire-rated partition where needed. Pedestrian routes are redrawn, signage is changed and the operator's safety team reviews the plan before work begins. Daily coordination meetings with the shift supervisors keep each side informed of the day's movements.
Hot work and fire system impairments get particular care. When the sprinklers are shut off for a tie-in, a fire watch is posted and the impairment is limited in time and area. Dust and noise are controlled, and the temporary partition is inspected daily. In facilities handling food or sensitive goods, we add cleaning and containment steps agreed with quality staff. This is the discipline described in our phasing approach for occupied sites.
Where expansions happen
Expansion tends to follow the original investment. In Colorado Springs, a distribution and sorting center planned at about 4 million square feet over five stories, with 800,000 square feet on the first floor, was proposed on 69.2 acres in Peak Innovation Park, the 960-acre business park owned by Colorado Springs Airport. A project that size starts with a large floor plate and a pattern of vertical growth, which affects how later additions attach.
Owners of distribution centers and logistics and fulfillment centers ask us the same question about growth: can the site hold the next phase without breaking operations? We map the available land, the setbacks and the stormwater and fire access limits early, and we show what each expansion path would do to truck circulation. Our ecommerce fulfillment work applies the same analysis to operations that run around the clock.
Plan the tie-in around your shipping calendar
Send us the existing drawings, the target area and your blackout dates and we will return an expansion feasibility outline with a phased schedule. Contact Industrial Contractors of Colorado to start.
Common Questions
Can we expand without stopping shipping?
Usually yes, if the plan separates construction from operations and schedules the tie-ins carefully. The addition is built outside the existing building, and the connection is made during a planned window. We map every impact on dock doors, trailer parking and fire access before work begins.
How do you handle the sprinkler system during the tie-in?
We plan the impairment in advance, limit the area and duration, post a fire watch and notify the authority having jurisdiction and the insurer as required. Temporary protection may be installed. The goal is to keep any impairment short and well managed.
Will the new floor match the old one?
We survey the existing slab and set the new slab elevations to meet it. Differences in flatness and joint pattern are handled with a transition detail. Material handling equipment that crosses the joint should be reviewed with the vendor.
What utility upgrades are common?
Electric service, fire water supply and sanitary capacity are the usual constraints. A bigger building means a larger fire flow demand and a larger electrical load. We check with the utilities and the fire authority at the beginning, since upgrades can take months.
Should we build vertical or horizontal?
It depends on land, soil and operations. Horizontal expansion is usually simpler to build while operating. Vertical expansion saves land but affects structure and foundations. We compare both against your site.