Grey Shell vs. Second-Generation Space for a Fitness Studio: Cost, Timeline & Buildout Considerations

Two spaces, same brand, same square footage, same city. One costs $80,000 more to build than the other. When a future studio owner asks me why, the answer is almost always the same: one was a second-generation space and the other was a grey shell. If you are looking at retail space for a Pilates, stretch, youth fitness or wellness studio in South Florida, this is the first thing to understand about the listing, because it moves your budget more than anything else you will decide.

What the two terms mean

A second-generation space is one that a previous tenant already built out. It has a finished ceiling, an HVAC system with ductwork that reaches the whole space, restrooms, an electrical panel with service sized for a retail tenant, and a slab that has already had plumbing run through it. A restaurant, salon, medical office or another fitness studio leaves a second-generation space behind when it moves out.

A grey shell, sometimes called a vanilla shell or a first-generation space, is what the developer hands over in a new building or a center that has never had a tenant in that bay. Concrete floor, block or metal-stud demising walls, a roof deck overhead, a capped water line and a sewer stub, an electrical service point and often a rooftop unit set on the roof with nothing connected to it. Everything a studio needs beyond that is the tenant's to build.

Most listings do not use either term. They say "great retail space" and show photos. You find out which one you are looking at by walking the space or by asking the right questions, and it is worth knowing before you fall in love with the location.

What a grey shell adds to the budget

Generally from our own completed studios across Broward, Palm Beach and Miami-Dade, we see a grey shell could add roughly $25 to $40 per square foot to the construction cost compared with a second-generation space in reasonable condition depending the size of the demolition scope. On a 2,000 square foot studio that is $50,000 to $80,000 before anything else changes.

The money goes into three places. Mechanical number one, the rooftop unit has to be connected, ductwork run to every room, and a fire-rated return path built if the ceiling is used as a return air plenum. Plumbing is second: restrooms have to be built from nothing, which means cutting the slab to run drain lines from the sewer stub to wherever the restrooms land in the brand's floor plan. Electrical is third: a new panel, distribution to the whole space, and the lighting circuits a studio needs.

Two landlord requirements often come with a grey shell in a newer center and are easy to miss because they live in the lease exhibit, not the franchisor's design guide. Sound insulation in the demising walls and above the ceiling adds about $10 to $11 per square foot. A requirement that the tenant buy the rooftop unit rather than reuse the landlord's adds another $8 to $10 per square foot. A grey shell with both of those can sit $35 per square foot above a clean second-generation space with neither.

When a second-generation space is not the bargain it looks like

A second-generation space is only a savings if what the last tenant left behind is usable. The three things we check first are the rooftop unit, electrical panel, the restrooms, demo scope, and the slab.

A rooftop unit that is fifteen years old and undersized for a room full of people exercising will need to be replaced, and then you have paid for a second-generation space and bought a grey shell's mechanical anyway. Restrooms at the wrong end of the space for the brand's floor plan mean cutting the slab just as you would in a shell. A slab with old plumbing trenches, patches or moisture problems can cost more to prepare for specialty flooring than a clean new slab would.

The other trap is layout. A former salon or restaurant has walls, plumbing and electrical exactly where that business needed them, which is rarely where a reformer room, a stretch floor or a youth training floor needs them. Demolition, and relocating a restroom group or a panel is an impact to the budget. A second-generation space that has to be gutted back to the shell can cost as much as a shell, with a demolition bill on top.

A first-generation example: IM=X Pilates in Port St. Lucie

Our IM=X Pilates and Fitness studio in Port St. Lucie started as first-generation space on NW Prima Vista Boulevard. The owner needed 3,390 square feet, which did not exist as a single bay, so the studio was built by combining two pairs of adjoining suites, 304 and 305 with 309 and 310, into one facility. The before photos show what we started with: carpet over slab, painted walls, a drop ceiling grid and windows, and nothing that a Pilates studio could use as-is. The finished studio has a reformer room with mirrored walls and accent lighting and a branded reception, and it opened in 2024.

The point of the example is not that first-generation space is bad. It is that the owner knew what the space was before signing and budgeted for it, so the mechanical, plumbing and electrical scope was in the number from day one rather than a surprise after the lease.

What to check before you sign

Walk the space with your general contractor before the lease is signed, not after. Ask the landlord's representative these questions and get the answers in writing where you can:

Is there an existing rooftop unit, how old is it, what is its tonnage, and does the tenant reuse it or buy a new one? Where are the sewer stub and water line, and are there existing restrooms? What size is the electrical service to the bay? Is the ceiling space a return air plenum? Does the lease exhibit require sound insulation, and what does it say the tenant is responsible for delivering? Are there columns inside the bay, and where do they land against the brand's floor plan?

The answers decide whether the space sits at the bottom of the cost range or the top, and they are the same items our Site Intelligence review covers on every space a client is considering. Found before the lease, an expensive answer becomes a bigger tenant improvement allowance, a rent abatement, or a decision to take the space next door. Found after, it becomes a check the tenant writes.

The short version

A second-generation space in good condition is usually the cheapest place to build a fitness studio. A grey shell could cost $25 to $40 per square foot more, and more than that if the lease exhibit adds soundproofing or a rooftop unit. A second-generation space that has to be gutted, or that comes with a failing rooftop unit, can cost as much as a shell. None of that is visible in the listing photos, all of it is visible in a one-hour site walk, and the time to do that walk is before you sign.

BuildPoint Construction Group is a licensed Florida general contractor (CGC 1531767) that builds fitness and wellness studios across South Florida, from Miami-Dade and Broward through Palm Beach County and the Treasure Coast. Book a discovery call or call our main office 1 (954)-905-0070 to have us walk a space with you.

Disclaimer: The information provided in this article, blog, website, or other content is for general informational and educational purposes only and should not be considered a quote, proposal, estimate, or guarantee of actual construction costs, schedules, permitting requirements, or project outcomes. Any costs, cost-per-square-foot figures, timelines, examples, opinions, or other information presented are preliminary and/or based on general industry averages, historical experience, or assumptions and may vary significantly from project to project.

Actual costs and requirements depend on numerous factors, including project location, existing conditions, design, scope of work, materials, labor, permitting, code requirements, site conditions, market conditions, and owner or franchisor requirements. Every project is unique, and actual costs can only be determined after a project-specific review and detailed scope of work.

BuildPoint Construction Group Inc. makes no representation or warranty regarding the accuracy, completeness, or applicability of the information provided and shall not be responsible for any decisions, costs, damages, or outcomes resulting from reliance upon such information. Readers should obtain a project-specific evaluation, estimate, and professional advice before making construction, financial, or contractual decisions.