Monthly lease rates by unit size, what Miami-Dade County Department of Regulatory and Economic Resources and the applicable municipal building department requires, the 175 mph Vult (HVHZ) engineering that applies here, and the point where buying beats renting. Real numbers for budgeting, not a "call for pricing" page.
Adjusted for this metro. Rate only; delivery, set and site work are separate and listed below.
| 8' x 20' · 160 sf2-3 people · Single office, one desk plus a small table. Fits a tight urban lot. | $250$225/mo on 12 mo · $195/mo on 36 mo |
| 10' x 40' · 400 sf4-6 people · Two-room split with a lavatory option. The most-leased jobsite size. | $435$390/mo on 12 mo · $340/mo on 36 mo |
| 12' x 44' · 528 sf6-8 people · Open bullpen plus a private office. Standard superintendent trailer. | $580$520/mo on 12 mo · $450/mo on 36 mo |
| 24' x 44' double · 1056 sf12-16 people · Doublewide, two entries, restrooms. Project field office for a large GC. | $1,085$975/mo on 12 mo · $845/mo on 36 mo |
| 24' x 60' double · 1440 sf18-24 people · Conference room, private offices, ADA restroom. Program office. | $1,525$1,370/mo on 12 mo · $1,190/mo on 36 mo |
| 36' x 60' triple · 2160 sf28-36 people · Triple-wide complex. Owner, GC and inspector share one building. | $2,255$2,030/mo on 12 mo · $1,760/mo on 36 mo |
Budgeting estimates based on researched market rates, not binding quotes.
This is where lease budgets break. Every one of these is a real line item.
| Delivery and set (single unit, level site)Truck, pilot car when required, block and level, tie-down. Rises with distance and crane need. | $1,400 - $3,200 |
| Delivery and set (doublewide / triple)Multiple trailers, marriage line seal, crane or forklift set, interior trim-out of the seam. | $3,600 - $9,500 |
| Teardown and return freightMirrors the set cost. Budget it at lease signing, not at the end of the job. | $1,400 - $9,500 |
| Steps, landings and ADA rampWood steps are cheap. A compliant ADA ramp with handrails and a 5 ft landing is not. | $650 - $6,800 |
| Skirting and anchoring packageRequired in most wind zones and by most municipal temporary-use permits. | $900 - $4,200 |
| Utility connection (electrical, water, sewer)The single most variable line. Depends entirely on how far the nearest service point sits. | $1,800 - $14,000 |
| Damage waiver / physical damage coverageStandard on lease paper. You can often substitute your own certificate of insurance. | 8% - 14% of monthly |
Construction across Brickell and downtown, port and logistics activity at PortMiami and the Medley and Doral industrial corridors, airport-area development, and a hurricane season that reliably converts into emergency temporary-facility demand. Miami also has the deepest concentration of HVHZ-experienced modular work in the country, which matters because a unit engineered to Miami-Dade standards is over-qualified everywhere else.
If you are leasing in Miami-Dade, verify HVHZ compliance and product approval before you sign anything. The cheapest monthly rate in this market is frequently a non-HVHZ unit that will fail inspection, and discovering that after delivery costs more than the rate difference ever saved.
Conventional office space in Miami asks $65.22 per square foot per year (Q1 2026 Miami office market reports (all-time-high average asking rent)). A 24' x 44' double modular office of 1056 square feet on a 12-month term runs about $975 per month, or $11,700 per year, which works out to roughly $11 per square foot per year including the building itself. Put differently, the annual cost of that modular building buys you about 179 square feet of conventional Miami office space at current asking rents. If you need more than that much space for more than three years, conventional space is probably cheaper. If you need less, or you need it at a specific site, or you need it before a landlord can build out a suite, the modular building wins.
Miami is the tightest and most expensive of these five office markets: average asking rents hit an all-time high of $65.22 per square foot in Q1 2026, up 2.9% year over year, with Class A advancing to $70.01. Vacancy stood at 14.9% with 344,000 square feet of quarterly net absorption and 1.3 million square feet under construction. This is the market where the lease-a-modular-building argument is strongest on pure cost.
That comparison is the honest one, and it does not always favor the modular building. What it does favor is control. A conventional lease puts you where the space exists, on the landlord's build-out schedule, with a multi-year term. A modular building puts a working office exactly where the work is, usually inside weeks rather than months, and it leaves when the job leaves.
Authority: Miami-Dade County Department of Regulatory and Economic Resources and the applicable municipal building department, with modular units carrying Florida DBPR approval.
Code enforced: 2023 Florida Building Code, 8th Edition, High-Velocity Hurricane Zone provisions.
Miami-Dade is the most demanding jurisdiction in the country for a modular building, and that is not marketing language. Every structure in the High-Velocity Hurricane Zone must meet HVHZ provisions of the Florida Building Code, which govern impact resistance, fastener schedules, roof assemblies and product approval. Components need Miami-Dade Notice of Acceptance or Florida Product Approval. A unit built to a generic national spec will not pass here without HVHZ-rated windows, doors and anchoring.
Miami-Dade sits in the High-Velocity Hurricane Zone with design wind speeds around 175 mph Vult, the highest in the continental United States, and the entire county is a wind-borne debris region. Glazed openings need impact-rated assemblies or approved shutters. The practical consequence is that an HVHZ-compliant modular office costs more to build and is worth more on resale, because it can be legally set anywhere in the country while a generic unit cannot be legally set here.
Much of Miami-Dade sits in FEMA flood zones with base flood elevations that force elevated set heights, and elevation plus HVHZ anchoring is what makes a Miami set more involved than the same unit dropped in Houston.
| Permitting authority | Miami-Dade County Department of Regulatory and Economic Resources and the applicable municipal building department |
| Building code edition | 2023 Florida Building Code, 8th Edition, High-Velocity Hurricane Zone provisions |
| Design wind speed | 175 mph Vult (HVHZ) |
| Oversize permit authority | Florida Department of Transportation (FDOT) Office of Maintenance, Oversize/Overweight Permits |
| Freight distance from South Florida | Local delivery |
Run the arithmetic on the 12 x 44 reference unit for this market rather than accepting a rule of thumb.
| Monthly lease rate on a 12-month term | $520/mo |
| 12 months of lease payments | $6,240 |
| 24 months of lease payments | $12,480 |
| 36 months of lease payments | $18,720 |
| Purchase price, new, same unit | $95,800 |
| Purchase price, refurbished | $56,900 |
| Lease months to equal a NEW purchase | 184 months |
| Lease months to equal a REFURBISHED purchase | 109 months |
Lease payments on that unit reach the cost of a refurbished purchase at about 109 months and a new purchase at about 184 months. Under roughly eighteen months, leasing is the right answer for most projects: you carry no resale risk and no maintenance obligation. Past thirty months you are usually paying for the unit twice, and buying leaves you holding an asset that still has resale value when the job ends.
The case for leasing past that crossover is real but narrow. It applies when the project end date is genuinely uncertain, when the unit has to disappear from the balance sheet, or when a single project budget cannot absorb a capital purchase.
Miami is the shortest and cheapest delivery of the five because units originate in South Florida. Local delivery avoids the multi-state oversize permitting and escort costs that dominate a California or Texas haul. FDOT issues oversize permits for anything over 8 ft 6 in wide; the constraint in Miami is not distance but urban site access, crane positioning and delivery windows on congested downtown parcels.
Before delivery, three things decide whether the set goes smoothly: a level pad with truck access and adequate turning radius, a confirmed utility connection point, and a permit on file. The most common cause of a failed delivery is not the building. It is a site nobody walked first.
Lease agreements in this industry are drafted by the lessor and the default terms favor the lessor. Every item below is negotiable, and asking before you sign costs nothing.
| What is the minimum term, and what does early termination cost? | Most agreements carry a minimum. Ending early usually triggers the balance of the term rather than a flat fee. |
| Is return freight quoted now or at pickup? | Quoted at pickup means market rate on the day, which you cannot budget. Get the number fixed in writing at signing. |
| Can I substitute my own certificate of insurance for the damage waiver? | Usually yes, and it commonly costs less than the waiver percentage applied to the monthly rate. |
| Who services HVAC and appliances during the term? | Should be the lessor on a lease. Confirm the response-time commitment, not just who is responsible. |
| What condition standard applies at return, and what counts as normal wear? | The vaguest clause in most agreements and the most common source of a surprise final invoice. |
| Does the rate escalate on renewal or month-to-month rollover? | Rollover rates are frequently higher than the original term rate. Ask for that number now. |
| Who pulls and pays for the permit? | Varies by supplier. If it falls to you, budget both the fee and the review time. |
| Is the unit engineered for 175 mph Vult (HVHZ)? | Ask for the anchoring and tie-down specification in writing rather than a verbal assurance. |
The two that cost the most money in practice are return freight and the return condition standard. Both are quiet at signing and loud at the end of the job.
Tell us the scope and the ZIP. You get a real delivered-and-installed number, not a "contact us for pricing" runaround.