Barndominium with Shop Floor Plans in Pennsylvania

The shop is the reason many people want a barndominium in the first place, and Pennsylvania's terrain gives it a natural place: at grade on the low side of a sloping lot, under the living floor, the way the lower level of a bank barn held the stock and the machinery. On flat ground the shop sits beside the house under the same roof. Either way, a shop that stores vehicles is a garage in the code's eyes, and the wall between it and the house is built to the garage rules.

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What actually changes with this feature

The look is the easy part. These are the decisions that follow from it.

The wall between shop and house

If the shop houses vehicles, the 2021 IRC's garage separation applies: at least 1/2-inch gypsum board on the garage side of the wall to the house, and 5/8-inch Type X gypsum board where living space sits above the garage, with the structure supporting that floor protected as well. No opening may connect the garage directly to a sleeping room.

The door and the way out

A door from the shop into the house must be solid wood or solid or honeycomb-core steel at least 1 3/8 inches thick, or 20-minute fire-rated, and self-closing and self-latching. The code also requires a way out of the dwelling that does not pass through a garage, so the shop cannot be the only route to the outside.

Earth disturbance adds up fast

A shop pad, the house, a driveway wide enough for a trailer and an on-lot sewage area can disturb a lot of ground. Under 25 Pa. Code Chapter 102, erosion and sediment controls are required for any earth disturbance, a written erosion and sediment control plan at 5,000 square feet, and NPDES permit coverage for stormwater from construction at one acre or more.

Detached versus attached

The UCC excludes a detached private garage, carport, greenhouse or shed accessory to a one-family house only when its building area is under 1,000 square feet, and a municipality may still require a permit by ordinance. A large detached shop, or any shop under the same roof as the house, is part of the permitted build.

Built like the barns around it

A machinery bay on the lower level is an old Pennsylvania idea

The Pennsylvania Historical and Museum Commission's field guide notes that the Pennsylvania Barn could accommodate a machinery bay on its lower level, beneath the threshing floors and mows, with the lower level opening at grade on the downhill side. A shop barndominium on a slope can do the same: an overhead door at grade into a shop below, and the house above it entered from the uphill side. Being built like a barn does not make it an agricultural building, though. The Uniform Construction Code excludes agricultural buildings, but its definition does not include habitable space, so a barndominium with living quarters is always a dwelling under the code.

Common ways to build this

Three common ways to lay this out. Yours does not have to match one exactly — this is a starting point for the conversation, not a catalog.

Shop at grade under the house

1,600 sq ft shop at the lower level / 1,600 sq ft living above

The shop opens at grade on the downhill side through two overhead doors; the house is entered from the uphill side. The floor between them is built to the garage separation rules, and the living level has its own exit to the yard.

Side-by-side under one roof

1,200 sq ft shop / 1,800 sq ft living

The classic layout on flat ground: shop at one end, living at the other, with a mudroom and laundry as the buffer between them. The mudroom door is the rated, self-closing door; the shop gets its own personnel door to the outside.

Shop with a finished office loft

1,500 sq ft shop / 400 sq ft office above the shop / 1,600 sq ft living

An office or hobby room over one end of the shop, reached from inside the house. Because living space sits above a garage, that floor gets 5/8-inch Type X gypsum board and protected supports.

Ways to build this

This layout can go together several ways. These are the service lines most relevant to it.

Shouses

Shouses in Pennsylvania: a new home and a full-size shop under one roof, planned so the work bay, the living space and the snow load all make sense.

Pole Barn Homes

Pole barn homes in Pennsylvania: barndominiums on big wood columns, designed, permitted and built as a full house under the Uniform Construction Code.

Site Preparation

Barndominium site preparation in Pennsylvania: clearing wooded and sloping lots, the drive, the pad, drainage and erosion controls before the foundation.

Barndominium with a Shop: common questions

6 questions worth settling before this plan is drawn. If yours is not on the list, put it in the survey.

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Is a barndominium with a shop an agricultural building?

No. The UCC's definition of an agricultural building does not include habitable space, so any building with living quarters is a dwelling under the code, even if half of it is a shop or a barn.

Does the shop need fire separation from the house?

If it houses vehicles, yes: the 2021 IRC's garage separation applies, with gypsum board on the garage side, 5/8-inch Type X under any living space above, and a rated, self-closing door into the house.

Can I put a shop under the living floor?

Yes, and on a sloping lot it is often the best use of the grade: the shop opens at the low side and the house is entered from the high side. The floor between them is built to the garage separation rules.

Does a detached shop need a permit?

It depends on its size and your municipality. The UCC excludes a detached private garage, carport, greenhouse or shed accessory to a one-family house only below 1,000 square feet of building area, and a municipality can still require a permit by ordinance.

Will a shop build need an erosion control plan?

Often. Pennsylvania requires a written erosion and sediment control plan once earth disturbance reaches 5,000 square feet, and NPDES permit coverage at one acre or more. A house, shop pad and long driveway can reach the first threshold on an ordinary rural lot.

Can the shop be the only exit from the house?

No. The code requires the path from the house to its egress door not to pass through a garage, so the living area always has its own door to the outside.

Want this drawn for your program and your parcel? That is where a build actually starts.

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Sources

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Tell us what you want to build and we will draw this for your program, then confirm what it looks like on your parcel, which code official or third-party agency reviews it for your municipality, and a realistic budget range. That conversation costs nothing.

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