Home Elevator Install in a Single-Story-to-Two-Story Addition in St. Petersburg

If you are planning a two-story addition to your St. Petersburg single-story home so an aging parent or spouse can have the primary suite upstairs, the vertical circulation call is one of the first decisions that shapes the whole project. An elevator changes the floor plan, the framing, the structural loads, and the addition budget. A stair-lift keeps the addition cheaper but constrains the layout and the recovery from a future mobility change. Conventional stairs are the cheapest option, and sometimes the wrong one.

This piece walks through how a general contractor scopes the shaft and framing work, what the elevator vendor supplies separately, and how the occupational therapist call fits into the sequence — so you can lock the addition scope without regret six months in.

Who does what — three separate scope lanes

A residential elevator install inside an addition is a three-scope project, and the trouble usually starts when a homeowner assumes it is a one-scope project. The three lanes are:

• General contractor (Revolution’s lane). We coordinate and execute the shaft framing, the structural work supporting the shaft and second floor, the pit rough-in below the shaft, the machine-room framing if the unit requires one, and the electrical and drywall coordination around the shaft. On an addition, this scope is folded into the broader addition project rather than run as a standalone job.
• Elevator vendor. The vendor supplies the elevator car itself, the drive system, the control unit, the doors, and typically performs the final installation of the mechanical equipment inside the shaft. The vendor also pulls the state elevator permit and coordinates the state inspection. Vendors vary by unit type (hydraulic, machine-room-less, pneumatic vacuum, cable-driven) and each has different shaft and pit requirements.
• Occupational therapist. Whether an elevator is actually the right vertical circulation call for the specific patient is a therapist decision, not a construction decision. A therapist can assess mobility progression, weight limits, transfer safety, and future needs — and sometimes the therapist recommends a stair-lift or a first-floor primary suite instead of an elevator.

If the addition scope is being drawn up before the therapist has weighed in, that is the first thing to fix. The elevator adds meaningful cost and complexity to the addition; you want to be certain the equipment matches the patient’s actual and projected mobility profile before it drives the floor plan.

What a residential elevator shaft actually needs — industry-generic ranges

Every elevator vendor publishes their own shaft, pit, and overhead requirements per unit, and the general contractor builds to those specific numbers. As an industry-generic starting frame for early planning conversations, a private-residence elevator typically needs:

• Shaft footprint: somewhere in the range of 4 feet by 4 feet to 5 feet by 5 feet, depending on the unit and car size. Larger cars accommodating a wheelchair and attendant push toward the upper end.
• Overhead clearance: typically 8 to 10 feet of clear space above the upper landing, though machine-room-less and some pneumatic vacuum units compress this.
• Pit depth below the lower landing: typically 8 to 14 inches for many private residence units, though some units require deeper.
• Machine room: cable-driven and some hydraulic units require a separate machine room adjacent to the shaft; machine-room-less and pneumatic vacuum units skip this.

Do not use these ranges as final dimensions. The vendor’s published requirement for the exact unit you select is what the general contractor builds to, and the vendor’s requirement wins any conflict with an industry-generic number. This is the first question to ask on the vendor call: “What are your shaft, pit, overhead, and machine-room requirements for the unit you are recommending?”

Elevator vs stair-lift vs conventional stairs — decision math

The three options solve different problems at different price points. In rough industry-generic terms:

• Conventional stairs. Cheapest option, no vendor coordination, no state elevator permit. Wrong answer if the patient’s mobility is already compromised or projected to be inside the design life of the addition.
• Stair-lift. Middle price point, specialty installer (typically not a general contractor), preserves the standard staircase for other household users, and can be added after the addition is built if mobility progresses. Constrained by staircase geometry — straight runs are simpler than L-shaped or curved runs.
• Private-residence elevator. Highest price point, dedicated shaft footprint that permanently occupies floor plan area on both levels, state elevator permit and periodic inspection, but delivers the widest usable mobility range including wheelchair transfer. Also the option most likely to preserve the home’s value for a future buyer with different needs.

The occupational therapist call and the addition scope conversation with the general contractor should happen close together. If the therapist recommends elevator-level mobility support and the addition floor plan is already locked without shaft space, the addition has to be redrawn. If the therapist recommends stair-lift-level support and the addition is drawn with a full shaft, you have paid for and permanently allocated floor plan area you did not need.

How the shaft-and-structural work folds into the addition scope

On a first-story-to-two-story addition, the shaft rough-in is scoped as part of the addition rather than as a separate project. Revolution’s role is to sequence the shaft framing, the pit dig or slab-recess below the lower landing, the structural steel or engineered lumber supporting the shaft, and the machine-room framing if the unit type requires one, into the overall addition build sequence. That typically means:

• Working from the elevator vendor’s shop drawings for the specific unit chosen before rough-in framing begins
• Coordinating pit rough-in with the addition’s foundation or slab work
• Sizing structural members and headers to the loads the vendor specifies
• Leaving electrical rough-in per vendor drawings so the vendor can wire the drive and control unit at final install
• Sequencing drywall and finish work around the vendor’s install window

Once the general contractor closes the shaft to the vendor’s ready-for-install condition, the vendor takes over the mechanical scope. The two teams overlap most on the final inspection and finish sequence.

Why a first-story-to-two-story addition is where the elevator conversation belongs

If the household is planning to stay in a single-story home and does not need a second story, the vertical circulation question is moot — there is nowhere to go up to. The elevator conversation belongs specifically to the scenario where an addition is being added upward and the primary suite is moving upstairs to preserve the single-family-home lifestyle without the disruption of a full rebuild or a move to a two-story house.

That framing decides most of the design questions. The upstairs primary suite gets planned around the elevator’s upper landing rather than the top of the staircase. The main-floor entrance to the elevator gets planned near the primary daytime circulation path — kitchen, family room, entry — so the equipment is used naturally rather than treated as an emergency device. Storage or a hallway pocket often folds into the shaft footprint on the main floor to keep the ground plan efficient.

What Revolution can do on a project like this, and what we cannot

On an addition scoped this way, Revolution operates as the general contractor across the whole project: framing, structural, mechanical rough-in coordination, and finish. We keep 20+ carpenters on W-2 payroll and have run additions and structural work in St. Petersburg since 2016, so the shaft framing and second-story structural scope is inside our lane. All work is billed time and materials with weekly budget reports so you can see where the addition and shaft scope is spending money.

We do not supply, install, or service the elevator car or control unit itself — that is the elevator vendor’s scope, coordinated in parallel with the addition build. We also do not make the medical or occupational-therapy call on whether an elevator is the right vertical circulation choice for the specific patient — that is the occupational therapist’s scope, ideally settled before the addition floor plan is locked. Florida licenses CRC1331628 and CGC1522463 cover the general contractor scope described here.

If you are planning a two-story addition in St. Petersburg and want a general contractor walkthrough to scope the shaft and structural work alongside your elevator vendor and occupational therapist calls, call (727) 888-6161 or request a free 48-hour estimate. Related reading: our aging-in-place service hub, our home addition services, our second-story addition subroute, our sibling accessible home renovations guide, our two-story to first-floor primary suite conversion piece, and our custom home building process guide.

Frequently Asked Questions

Related Resources:

• Aging-in-place services — our aging-in-place service hub
• Home addition services — our home-addition hub
• Second-story additions — second-story addition subroute
• Accessible Home Renovations — sibling aging-in-place blog on layout and mobility
• Two-Story First-Floor Primary Suite Conversion — closest topical adjacency
• Custom Home Building Process — structural context piece

Call Revolution Contractors at (727) 888-6161. We’ll walk the plans with you, coordinate with your elevator vendor and occupational therapist, and give you a real read on how the shaft and structural scope will land inside the broader addition.