Parking Without People: A Fire Code Primer on Fully Automated Parking Systems
An introduction for architects and developers (and a look at what just changed in NFPA 88A)
Automated Parking Systems (APS) carry advantages you may already know: twice the cars in the same volume, no ramps, no drive aisles, etc. The value proposition is easy to grasp. Historically, fire code has been the harder part. For years the applicable standard said very little about automated parking, which turned every project into a negotiation with the local fire marshal. That just changed. The 2027 edition of NFPA 88A, Standard for Parking Structures, was issued in April 2026, and it’s the first edition that gives automated parking real, specific, prescriptive fire protection criteria. If parking systems are anywhere on your drawing board, here’s what you need to know.
First, get the vocabulary right
NFPA 88A doesn’t treat “automated parking” as a single category. It defines a parking system, as equipment that parks vehicles by mechanical or automatic means, whether stand-alone or built into the building. From there, the standard splits parking systems into three types, and the requirements differ meaningfully between them:
A stacker parking system stores vehicles vertically only. Think of the two-post lifts that double a space in a conventional garage. People still drive and walk right up to them.
A mechanical parking system stores and retrieves vehicles on platforms, moving them horizontally and vertically to an open slot. More machine, but people may still occupy portions of the space. Commonly referred to as a “lift and slide” system.
A fully automated parking system is the whole show: an unoccupied vehicle storage and retrieval system that moves cars in all three axes. You leave your car in a transfer area (or Terminal as it’s referred to in the code), and the machine takes it from there, with no human intervention.
That word unoccupied is the hinge the whole code turns on.
Why fully automated systems get treated differently
Fire codes spend most of their energy protecting people. A fully automated system has no people inside it so NFPA 88A, sensibly, doesn’t ask it to behave like an occupied building. Means of egress per the standard’s egress chapter isn’t required within a fully automated system. Standpipes aren’t required within it. Neither is a fire alarm system.
But the trade-off is real, and this is the part architects and developers sometimes miss: what the code gives back in egress and alarms, it reclaims in access and hardware. Because firefighters can’t walk into a dense area full of cars, the standard requires dedicated access for fire service and maintenance personnel: 36-inch clear walkways, stairs, and door openings, horizontal walkways at regular vertical and horizontal intervals, limited travel distances, and an exterior door at grade for every stairway. And because a burning car on level six of a rack is not something you can stretch a hose line to, the fire protection burden shifts almost entirely onto the sprinkler system.
Stackers and mechanical systems sit closer to conventional garage territory. People are still around them, so the exemptions above don’t apply: those carve-outs are written specifically for fully automated parking systems. In fact, the 2027 edition tightened this language on purpose: the old edition exempted “automated-type parking structures” broadly, and the new one narrows the exemptions to fully automated systems only.
Stackers also picked up their own new rule in the general sprinkler chapter: a two-high car stacker in an otherwise ordinary garage now defaults to an Extra Hazard (Group 2) sprinkler design (a substantially heavier water demand) unless supplemental sprinklers are installed above each vehicle, in which case Ordinary Hazard (Group 2) is permitted. If your project has stackers penciled in as a cheap density play, that sprinkler note belongs in the pro forma.
What the 2027 edition changed
The 2023 edition’s fire protection requirement for automated parking was, in essence, one sentence: install sprinklers per NFPA 13. It named no hazard classification, no in-rack protection, no water supply duration. Every design team and every AHJ filled that vacuum differently.
The 2027 edition replaces that sentence with a genuine design recipe. The ceiling sprinkler system must be designed to Ordinary Hazard (Group 2), with no quick-response area reduction and sprinkler spacing capped at 12 ft 6 in. More significantly, flue sprinklers are now required at every vehicle platform level, located within 3 feet of the front and back of each platform, with a defined hydraulic calculation: the two most demanding levels flowing, four sprinklers per level, at a minimum of 20 gpm per sprinkler. In plain terms: sprinklers inside the rack, at every level, sized to hit a car fire where it lives. The standard also now requires flue spaces of no more than 24 inches between vehicles; go wider, and you’re into a performance-based design.
Electric vehicles drove two of the most consequential changes. First, EVs are only permitted on the ground level of a parking unit unless every level of that unit is built with noncombustible solid vehicle parking platforms. The annex explains the intent: a solid, noncombustible surface under every car keeps the heat of a fire below from cooking the underside of the vehicle above and keeps burning battery debris from raining down onto the cars beneath. The code now rewards that construction directly. Second, wherever EVs or chargers sit on upper levels, the water supply must last 120 minutes, that is twice the duration most garage designs are built around. If your project’s water service is marginal, this is a line item to catch early.
Fully automated systems received one new obligation that deserves a spot in your specs: an automatic retrieval system must be provided so that cars not readily accessible to fire department operations can be moved to approved designated locations. The machine, in other words, is now part of the fire protection strategy.
The concrete slab advantage
That platform provision is worth dwelling on, because it quietly establishes a hierarchy of APS construction and full concrete slabs sit at the top of it.
The code’s minimum ask for upper-level EV parking is a noncombustible solid platform under each vehicle. But consider a system that goes further and parks cars directly on a structural concrete slab at every level, with the only openings in the slab being the vehicle lift shafts. Now each parking level is its own compartment. A car fire, battery or gasoline, is boxed in by concrete above and below. There’s no path for flame to jump vertically through the rack, no dripping burning material finding the car downstairs, and the fire the sprinklers have to control looks like a fire in a conventional garage bay rather than a fire in a warehouse rack of cars.
That has knock-on benefits across the whole fire protection package. The flue sprinkler rules exist because in an open-platform rack, ceiling water can’t reach a fire buried five levels deep so the code sends sprinklers into the rack. With a slab at every level, every level effectively has a ceiling, and the sprinklers beneath each slab attack the fire directly, the way they do in any parking garage. (The standard’s own annex takes the position that garages without stacker systems can be protected as Ordinary Hazard Group 2 regardless of what vehicles are present or whether EV chargers are installed because level-by-level ceiling protection works.) The slab also does structural double duty: where a performance-based design comes into play, NFPA 88A’s criteria are about keeping concrete and steel below failure temperatures during a fire, and a concrete-slab system starts that analysis with an enormous head start over exposed steel framing.
The slabs also transform the firefighter access story. The 2027 edition requires fully automated systems to provide fire service access: 36” clear walkways, stairs, and doors, horizontal walkways every 20 feet vertically, limited travel distances and in an open steel rack, that means hanging dedicated catwalks inside the machine, which crews then work from with fire potentially below their feet. With a slab at every level, every level is a continuous walking surface standing between the firefighter and whatever is burning below. The fire department arrives to a known fire on a known level and operates the way they would in any low-clearance garage, on concrete, which also puts the structural collapse conversation to rest in a way exposed steel framing never quite does. Access paths, headroom, and the code’s required automatic retrieval capability still need to be designed in, but the starting point is a floor that already exists rather than a catwalk that has to be added.
And of course it makes the EV question somewhat boring, in the best way. A slab at every level doesn’t just meet the “noncombustible solid platform” condition it exceeds it by a comfortable margin, which turns “can we park EVs on the upper levels?” from a negotiation into a checkbox. The two things a slab doesn’t buy you: the 120-minute water supply duration still applies whenever EVs or chargers occupy upper levels, and the lift shafts, now the only vertical openings, will need attention under the adopted building code’s shaft and opening protection provisions. Both are manageable and neither is a surprise if they’re on the table at concept design.
For developers comparing APS proposals, this is a genuinely useful differentiator to ask about: what are the cars actually sitting on? Open steel platforms, solid steel pans, and full concrete slabs are all “automated parking” on the brochure, but they land in very different places under the 2027 edition.
A formal path for the exceptions
Finally, the standard rebuilt its performance-based design chapter into a full framework: fire risk assessment, qualified designers, optional third-party review, explicit structural temperature limits, and lifetime documentation. For unusual geometries that can’t meet the prescriptive rules, the standard now offers a legitimate, well-marked alternate path instead of an ad hoc variance conversation.
The timing caveat
The 2027 edition is already NFPA’s current edition, effective May 2026. Your local jurisdiction, though, is almost certainly still enforcing an older code that references the 2023 edition or earlier. That gap makes the 2027 edition a preview of where every AHJ conversation is heading. Designing a parking system today to the 2027 criteria is the safest way to future-proof the project, and many fire officials will happily accept the newer edition as the basis of design even before formal adoption.
The takeaway
Automated parking is no longer a code gray area. The 2027 edition of NFPA 88A tells you what kind of system you have, what protection it needs, and how EVs change the math. For architects and developers, the practical checklist is short. Know which of the three system types you’re specifying. Ask what the cars will actually sit on, favoring solid noncombustible platforms, and ideally full concrete slabs, if you want EVs above the ground floor. Budget for the sprinkler design the type demands. Confirm your water supply can deliver 120 minutes if EVs will park up high. Then bring your fire protection engineer and your AHJ into the conversation at concept, not at permit. The system supplier belongs in that early conversation too. Platform construction, sprinkler access, and where chargers can sit are decisions made in the layout, not corrected after it, and the answers differ by system type. We work through those questions with design teams before a drawing set gets far enough that changing them costs money.
The machines are ready to park your cars. Now the code is ready for the machines.
Written by Ian Todd, EVP of Automated Parking at Westfalia Technologies, Inc.
