Coll Structural builds the structural shell, from foundation to a completed, inspected structure, for single family homes and multifamily buildings across Miami-Dade, Broward, and Lee County. Our own crews, our own superintendents, and the preconstruction done before we mobilize.
Coll Structural did not start as a shell contractor.
It started as a general contractor and developer running ground-up projects across South Florida, hiring shell subcontractors, and running into the same problems repeatedly: pricing that moved once the pour started, schedules that slipped, and communication that went quiet mid-project.
The shell scope was eventually pulled in-house and self-performed instead. After enough projects, that stopped being a workaround and became a repeatable system, run with the same discipline as every other GC and development job. Coll Structural is that system, offered to the market.
A stalled shell costs the owner carrying costs and costs us the same days. So the work that decides the schedule happens before we mobilize.
We identify everything the shell needs, drawings, surveys, materials, crew, access, and inspections, and communicate it to the client before ground is broken. When we hit the ground, we hit it running, with nothing left to ask.
Schedule, budget, and field and daily reports run through BuilderTrend, the same system we run our own general contracting and development projects on, and are shared with the GC. Plans are taken off with AI-assisted takeoff software, layout is set with a total station, and progress is documented with drone photography. Pricing is line-item and tracked against the budget, not handed over as a flat number.
The shell scope is priced and scheduled tightly. Every day lost costs us what it costs you, so moving fast is not a favor. It is how this scope makes money.
Leonardo Coll
Principal · Florida Certified General Contractor
Leonardo Coll is a Florida-licensed general contractor with a civil engineering degree from the University of Miami and construction experience in South Florida since 2015. He runs Coll Construction, an active general contractor building ground-up projects across Miami-Dade, Broward, and Lee County, and built Coll Structural from the shell work his own crews were already self-performing on those jobs.
The field is 35 people on our own crews, under our own superintendents, with decades of combined experience building structural shells across South Florida. We self-perform masonry, formwork, rebar, and concrete placing and finishing.
Large shell contractors are staffed and priced for towers and podiums, so single family homes and mid-size multifamily buildings sit below their minimums. Many small crews build well but are not set up to price line-item, schedule against a baseline, and document progress the way a general contractor does. Coll Structural is built for that range: self-performed shell work with general contractor systems.
Our own crews and superintendents. Line-item pricing tracked against your budget. A schedule set before we mobilize. One point of contact.
The discipline of a general contractor, applied to the shell.
Coll Structural builds the structural shell for single family homes and multifamily buildings. Taller buildings carry threshold-building inspection requirements under Florida law, so buildings of four or five stories are priced from the structural drawings. Larger projects are considered case by case.
A two-story single family concrete shell in Coconut Grove, from rebar to pour.
A planning range in under a minute. It is not a quote: a firm number needs your drawings and site conditions.
Enter your project details and calculate to see a range.
Estimated structural shell budget
Planning range only, not a quote or bid. Height, structural system, soil and foundation conditions, site access, and market pricing at the time of contract all move the firm number.
Get a firm numberMaterials, crew, and site dependencies are confirmed before mobilization, not worked out after the crew is already on site. That is what keeps the schedule from slipping once it starts.
Drawings reviewed, needs identified and communicated to the client, materials ordered, crew scheduled, and the schedule and budget set in BuilderTrend, before ground is broken.
Boundary, foundation, and elevation surveys arranged and delivered for permitting and inspections.
Excavation, footings, and slab or stem wall to the engineered plan.
CMU laid and grouted, vertical rebar and dowels placed, tie columns and tie beams formed and poured.
Hurricane-strapped trusses, or formed, shored, and poured concrete slabs and flat roofs.
Required inspections passed. Structural shell complete.
Send the drawings. You get a line-item shell estimate, a schedule set before mobilization, and one point of contact. Our own crews and our own supervision on site, and a certificate of insurance on request.
Request an estimateWe are building crews of masons, formwork carpenters, rebar installers, concrete finishers, and laborers. The work is planned before it starts: drawings reviewed, materials ordered, and the site ready when the crew arrives. Hablamos español.
Got it. We will call you.