Barndominium with Shop Floor Plans in Maryland

A barndominium with a shop is the plan that most often brings people to this kind of building in the first place: a house and a workshop, equipment bay or hobby garage under one roof or side by side. In Maryland the shop decides three things early. Attached, it needs the code's separation from the living space. On a wooded lot, the combined footprint of house, shop, apron and septic area decides whether the state's forest conservation rules come into play. And near the Bay, a shop's gravel apron counts against lot coverage just like its roof. The layouts below are concept plans, not permit drawings.

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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 the shop and the house

A shop that stores cars, tractors or boats is a garage under the code. Where it adjoins the living space, the separation is at least 1/2-inch gypsum board on the garage side, and at least 5/8-inch Type X gypsum board under any habitable room above it. The door between them must be solid wood or steel at least 1-3/8 inches thick, or 20-minute rated, self-closing and self-latching, and it may not open into a bedroom.

Sprinklers cover the house, and the plan shows the line

Maryland requires an automatic sprinkler system in every new one- and two-family dwelling, and a county may not weaken that rule by local amendment (Public Safety Article §12-504). In a shop-house the concept plan marks which side of the separation wall is dwelling, so the sprinkler layout, the heating and the finish level follow the right line.

Gravel and concrete count near the water

Inside the Critical Area, lot coverage includes any structure, driveway, walkway or parking area, and any ground covered with gravel, stone, pavers or other man-made material. A shop's apron and turning area can match the shop's own roof in coverage, and most lots there are capped at 15 percent, so on a waterfront lot the shop is sized together with its gravel.

What the shop is used for is a zoning question

A personal workshop, a farm equipment bay and a home business are treated differently by county zoning. A business with employees or customers visiting may need a home occupation approval. Tell the county what the shop is for when you apply, because it decides which standards apply to the shop half of the building.

How big the clearing gets

A shop doubles the footprint, and on a wooded lot that matters

Maryland's Forest Conservation Act applies to subdivision plans and grading or sediment control permits on areas of 40,000 square feet or more. Building a house for yourself or your child is exempt, and so is activity on a single lot of any size, only while no more than 20,000 square feet of forest is cut, cleared or graded (Natural Resources §5-1602). A 40 by 60 shop-house, its gravel apron and turning area, the driveway, the septic area and its replacement fields, and the well clearance add up quickly. On a wooded parcel, draw the clearing limit on the concept plan and keep it inside the number, or plan for a forest conservation plan. Your county's own forest conservation ordinance may set a stricter rule.

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-house under one roof

1,500 sq ft living / 1,500 sq ft shop

A 40 by 75 building split down the middle by the separation wall, with a mudroom and laundry at the connection. The shop gets a 14-foot overhead door on the gable end and a clear span for a lift or a boat, and the living half has two bedrooms and an open kitchen and great room.

House with a detached shop

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

A three-bedroom house with the shop set apart across a shared gravel yard. Detached far enough from the house, the shop does not need the separation wall and can carry its own heating, and it can go to a different spot on the lot from the septic area and well.

Loft apartment over the shop

900 sq ft loft living / 1,800 sq ft shop below

The shop takes the ground floor and a compact apartment sits above it, reached by its own stair. The floor between them is built as the code's separation for a habitable room above a garage, and the apartment gets its own escape windows, smoke alarms and sprinklers as a dwelling.

Ways to build this

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

Shouses

Shouses in Maryland: a home and a full-size shop under one roof, on a steel or pole barn frame, planned so the shop never crowds the house.

Pole Barn Homes

Pole barn homes in Maryland: wood post-frame barndominiums built as permitted houses, from shell to finished home, with or without a shop.

Steel Construction

Steel barndominium construction in Maryland: red-iron frames designed for your site, erected on engineered foundations and finished as homes.

Barndominium with a Shop: common questions

6 questions worth settling before this layout goes any further. If yours is not on the list, put it in the survey.

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What is the best size for a barndominium with a shop?

It depends on what goes in the shop. A two-car shop is about 24 by 24 feet; a shop for a tractor, a boat or a lift usually needs 30 to 40 feet of width and a tall door. Size the shop around the largest thing you will park in it and the door it needs, then size the house.

Does an attached shop need a firewall?

It needs the code's dwelling-garage separation: at least 1/2-inch gypsum board on the shop side of the shared wall, 5/8-inch Type X under any habitable room above, and a solid or fire-rated self-closing door between them. That is less than a full fire wall, but it has to be continuous.

Can I run a business out of my barndominium shop?

Possibly. County zoning decides whether a home business is allowed on your parcel and on what terms, especially if customers or employees visit. Check your county's home occupation rules before you plan the shop's size and parking.

Will clearing trees for a shop trigger a forest conservation plan?

It can. The state act exempts an owner's own house and a single lot only while no more than 20,000 square feet of forest is cut, cleared or graded, and some counties set a stricter rule. On a wooded lot, measure the whole clearing: house, shop, apron, driveway and septic area together.

Is a shop-house under one roof cheaper than two buildings?

One roof and one foundation usually cost less than two, but the attached version adds the separation wall and fire-rated door. A detached shop saves those and gains flexibility on the lot. Compare both on your parcel.

Can the shop have a bathroom?

Yes, and many do. Any fixtures in the shop drain to the same septic system as the house, so tell the health department about them when the septic permit is sized. Licensed trade contractors handle the plumbing.

Keep reading

The pages that answer the next question this one raises.

40x60 barndominium floor plans

The most common shop-house footprint, and how its 2,400 square feet sit on a Maryland lot.

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Barndominium floor plans with a garage

The same separation rules for a two- or three-car garage, with a mudroom entry.

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Want this layout tested against your program and your parcel? That is where a build actually starts.

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Sources

Start with a concept layout

Tell us what you want to build and we will talk through this layout for your program: how it sits on your parcel, where the septic area and any Critical Area line fall, which county or town office permits it, and a realistic budget range. The layouts on this site are concept plans, not permit drawings. That first conversation costs nothing.

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