Most plan reviews here cover full houses, but every so often a small outbuilding earns the full write-up because it solves a problem homeowners raise constantly: where to put the lawnmower, the kayaks, the woodworking bench, the kiln, the second-car overflow, or the potting station that has slowly taken over a Charleston side porch. Plan 67849MG is that outbuilding. It is a 476-square-foot detached garage with a Modern Farmhouse envelope, a 10-foot by 8-foot overhead door, 9-foot-4 interior ceilings, and a 168-square-foot covered porch (28 feet by 6 feet) running the long side. It is not a dwelling (zero bedrooms, zero baths, zero heated square footage), and that clarity is the point. The plan accepts what it is, builds in the architectural moves that make a small structure read as a designed outbuilding rather than a metal kit, and leaves the interior open so the owner decides whether it becomes a one-car garage, a workshop, a garden room, or a covered staging area for a primary residence.
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Floor Plan
Main Level
The footprint is organized as a long, slim rectangle. The garage bay measures 16 feet by 27 feet (432 square feet of clear floor area), with the 10-foot-by-8-foot overhead door on one short end and a single service door on the long side stepping out to the covered porch. The interior is a single open volume with 9-foot-4 ceilings, meaning a full-size pickup, a contractor van, or a tall SUV slides in without the constant ceiling-height anxiety that 8-foot garages produce. The 28-foot-by-6-foot covered porch runs the length of the side elevation, and that is the architectural move worth flagging, because it is what separates this plan from a generic prefab garage: it gives the structure a sheltered work zone, a place to drop muddy boots before walking to the house, and a covered transition from outside to inside that you would otherwise have to bolt on with a separate pergola. The plan is intentionally free of interior partitions; owners specify where the workbench, the slat wall, the bike hooks, or the storage cabinetry go after framing.
Exterior Renderings
The exterior is doing the work that makes the price tag worth it. White vertical board-and-batten siding, a clean gable roof with dark shingles, and a stained wood overhead door with rectangular glass lites form a tight Modern Farmhouse vocabulary that suits a Charleston, Mt. Pleasant, or Summerville back-lot outbuilding almost line for line. The wood columns supporting the porch roof are the styling detail not to let a builder substitute: they carry the secondary structure visually and warm the otherwise white envelope. Renderings include both daylight and twilight conditions; black lantern sconces flank the overhead door, and the dusk view adds a soffit downlight band under the porch eave, which is the lighting plan worth copying because it gives the building presence at night without resorting to floodlights. The landscape across the eight renderings varies from clipped lawn to soft mounded grasses, which is useful: it tells you the structure carries its own architectural weight and does not depend on heavy landscaping to look intentional.
Interior Renderings
The two interior renderings show how the open volume reads once the building is in use. The 9-foot-4 ceiling height is the headline detail, because it lets the pegboard, shelving and the overhead door opener and tracks sit at proper working height without crowding a tall vehicle below. A concrete-style floor finish runs wall to wall, which is the right specification because it accepts oil drips, sawdust, garden soil, and seasonal moisture without ceremony. Natural light enters through the wood door glass lites on the short end and a window on the long side, supplemented in the renderings by flush square ceiling lights. Baseboard heating elements appear along the perimeter walls in one rendering. Those are the plan's nod toward year-round usability, but treat them as one option rather than a baked-in commitment, because how you climate-control this building depends entirely on what you intend to keep in it. For a tour of how similar spaces can become actual rooms, our walk through twelve garage-to-studio transformations is the natural companion to this review.
What Works & What to Weigh
What Works
The overhead dimensions are the plan's strongest asset. The 9-foot-4 ceilings accept tall trucks, overhead storage racks and shop lighting without compromise, and the 10-foot-by-8-foot overhead door fits full-size pickups, contractor vans, small boats on trailers and most garden equipment. The open interior has zero partitions, so the owner can specify shelving, slat walls, workbenches and bike storage after framing.
The 28-foot-by-6-foot covered porch turns the side elevation into a real sheltered work zone for potting, equipment staging and muddy-boot transitions, and the service door opening directly onto it supports a real workflow between interior storage and outdoor work. On the outside, the Modern Farmhouse envelope reads as a designed outbuilding next to a primary residence, not a metal kit dropped on a pad. Single-story slab construction keeps the build straightforward and permitting predictable in most jurisdictions.
Where Plan 67849MG Asks for Compromise
Be clear about what this building is. With zero heated square footage, zero bedrooms and zero baths, it is an accessory structure, not an ADU or guest cottage as drawn. Single-bay capacity is restrictive for multi-vehicle households unless the building is dedicated to workshop, storage or hobby use, and the 16-foot interior width is tight for a parked vehicle plus a full perimeter workshop, so pick one primary function before specifying the layout.
Vehicle fit needs checking too. A 10-by-8 overhead door clears most pickups but is shorter than 9-foot-tall lifted trucks or RV doors require, so measure your vehicle before assuming it fits.
Services and comfort take planning beyond the base plan. Climate control, water and any restroom build-out require additional planning, trenching and permits. Because the building is detached, utility runs (electrical sub-feed, optional gas, optional water) need to be coordinated with the primary residence service before the slab is poured. The covered porch is unconditioned and uninsulated: pleasant three seasons in Charleston or Atlanta, less so in a Nashville winter without a portable propane heater.
Facade Variations: Design Proposals
The eight facade directions below are our own design commentary on how Plan 67849MG could be finished to suit different sites; they are not options offered by the original plan set. Use them as visual references when you sit down with your builder, designer, or landscape architect to choose siding, roof, trim, and planting palette for the outbuilding.
Coastal Tropical Modern Farmhouse
A light-toned stucco envelope, pale wood support columns, and a soft-gray shingle roof carry this version into the warm-and-humid climate zones of the Florida Gulf Coast and the South Carolina barrier islands. The landscape leans on broad-leaf tropicals and concrete pavers with grass infill, a planting approach that absorbs salt air better than fine-leaf ornamentals. We would direct this version toward a Naples, Marco Island, or Hilton Head owner building a garden-tool and golf-cart outbuilding behind a coastal primary residence.
Chalk white smooth stucco under a pale silver-grey shingle roof gives an almost all-light envelope, broken only by bleached oak columns and a matching whitewashed wood door. Copper-bronze lanterns and terracotta pots carry the warm accent, and the pale pitted pavers set the warmest neutral underfoot, a tone worth matching when choosing the column finish.
Stone-Base Modern Farmhouse
Vertical white siding paired with a dark standing-seam metal roof and a stone water-table skirt at the base. Soffit downlights and tightly trimmed boxwood produce a polished, maintained read that lands well on equestrian properties and large suburban lots in upstate South Carolina, Aiken, and the Tryon, NC corridor. The stone base is more than aesthetic: it solves the splashback staining issue that plain white siding suffers near gravel driveways and mulch beds.
Crisp white board-and-batten, a charcoal standing-seam roof and black window frames make the base contrast, while the porch posts and front door bring in a reddish cedar tone. The ivory limestone skirt and matching walk sit between those extremes, so choose a siding white slightly cooler than the stone and the skirt will read as a distinct band.
Contemporary Cottage
Horizontal white cladding, a dark metal roof, and high-contrast black window and door frames make this the crispest version of the family. The landscape is the differentiator: a structured walkway flanked by lavender beds and clipped boxwood borders that read like a small kitchen garden. We would point this at a Charleston peninsula garden cottage, a Savannah historic-district carriage-house replacement, or a Charlotte Myers Park property where the outbuilding sits within sightlines from the main house and needs a designed edge.
Bright white lap siding and white-dipped bases on honey-toned wood posts give this porch a two-colour rhythm, and the slate-black roof, black plank door and black window frames tie the dark notes together. Brass hardware and brass planters pick up the warm wood, so a single brushed brass finish for every fitting keeps the accents consistent.
Natural Wood Modern Cabin
Full natural cedar or hemlock siding, a dark metal roof, and a gravel forecourt with irregular stone steppers and moss accents. A single ornamental tree carries the focal point. This direction suits the North Carolina mountains around Asheville, the South Carolina foothills around Greenville, the Tennessee plateau near Sewanee, and any heavily treed back-lot where the outbuilding should disappear into its setting rather than announce itself to the road.
Warm amber cedar board-and-batten and silver-weathered posts put two ages of wood on one front, under a graphite standing-seam roof. The bluestone steppers and pale gravel set a cool grey ground plane and the dark walnut door bridges the two, so stain samples should be tested against both the slate-grey stone and the bright cedar.
Dark Modern Farmhouse
Charred or deep-black painted siding combined with a stone water table, a dark standing-seam roof, and natural wood columns for contrast. Sparse, cool-toned plantings (silver-leaf sage, ornamental grasses, and a single specimen tree) keep the landscape as restrained as the envelope. This direction works for owners who want the outbuilding to read as a strong visual presence on a Nashville exurban lot, a Charlotte Lake Norman property, or a contemporary rural Georgia site where the primary residence already carries a dark palette.
Charred black board-and-batten and a matte black roof form a near-solid dark envelope, so the orange-toned timber posts and beams and the walnut door with brass inlays do all the warming. The base is a charcoal and tan ledgestone, and its occasional buff pieces are the ones to match when picking the flagstone walk.
Desert Modern
Smooth stucco walls, a terracotta tile roof, and xeriscaped grounds featuring barrel cacti and agave. Gravel ground cover with metal-edged planters minimizes irrigation demand. This sits outside the Southeastern markets covered here; it is a transplant direction for a reader building a back-lot workshop in Scottsdale, Tucson, or Santa Fe, where the outbuilding needs to match a regional adobe-influenced primary residence rather than carry a Southeastern farmhouse palette.
Warm cream stucco, an orange-red clay tile roof and weathered grey timber posts keep the palette to three earthy tones, with black steel-framed glazing as the only hard line. The white gravel and gold metal edging brighten the ground, so the stucco should lean slightly warmer than the gravel or the wall will look dull beside it.
Rustic Craftsman
Dark stained wood siding over a stone base, topped with a dark shingle roof. The porch is flanked by ferns, hostas, and shade-tolerant native plantings, with a working potting bench tucked under the eave to reinforce the utilitarian character. This is the right direction for the Tennessee plateau, the Blue Ridge corridor between Asheville and Boone, and the wooded suburbs around Brevard, wherever the primary residence already carries Craftsman or Arts-and-Crafts vocabulary and the outbuilding needs to belong to that family.
Chestnut-stained horizontal boards and golden cedar posts sit over a rounded fieldstone base in grey, rust and tan, all under a black shingle roof. The black door frame, window sashes and gutters echo the roof, and the sage-green potting bench quietly repeats the hosta foliage, a muted green worth borrowing if trim or shutters ever need paint.
Formal Evening Modern Farmhouse
Smooth white stucco under a dark shingle roof, black frames on the door and window, and uplights set into the base of each column give this version its evening character, while clipped boxwood, spiral topiaries and white flowering shrubs line a walk of large pale slabs set in dark gravel. It suits owners who use the porch after dark, for a late dinner at the bistro table or an hour at the potting bench, and who want the building to look composed at night without floodlights. A Washington DC metro back-lot, a Charlotte Eastover property or a Charleston South Battery garden, where the main house already sits within formal landscape architecture, would carry it well.
Matte white walls and a slate-grey shingle roof frame rust-toned columns that glow copper under the soffit lighting, with the black door and black window frames providing the sharp edges. Under warm night lighting a pure white wall turns cream, so judge the wall sample after dark as well as by day.
Regional Fit & 2026 Build-Cost Context
Plan 67849MG belongs in the part of the Southern and coastal market where outbuildings are part of the property strategy rather than an afterthought: Charleston back-lots, Savannah carriage-house replacements, Nashville and Charlotte equestrian properties, Naples golf-cart-and-garden outbuildings. Small detached structures carry a higher per-square-foot cost than comparably finished primary residences because foundation, slab, mobilization, and permitting fixed costs spread across only 476 square feet of unheated garage (and the 168-square-foot covered porch is unconditioned). The figures below assume the base plan as drawn (slab-on-grade, framed Modern Farmhouse envelope, white board-and-batten siding, wood overhead door, gable shingle roof, finished electrical, surface lighting, base-grade interior with no climate control, water, or restroom), built on a level, buildable site with reasonable utility access from the primary residence.
Charleston, SC, is where the Contemporary Cottage facade makes the most sense, with its kitchen-garden walk and crisp black trim, at a turnkey allowance of $58,000–$86,000. The rules there are ASCE 7-22 wind loads and IRC 2021 with South Carolina amendments; in coastal zones the porch posts need engineered uplift anchors, and cedar or fiber-cement siding holds up to salt air better than plain wood. Savannah, GA, suits the same cottage direction for a little less, $54,000–$79,000. Georgia builds under IRC 2018 with state amendments, the humidity argues for a rain-screen gap behind the siding, and in a historic-overlay district an accessory building may need a setback variance before it can be permitted.
Nashville, TN, leans toward the Dark Modern Farmhouse, whose black envelope and stone water table sit well on an exurban lot, at $52,000–$76,000 turnkey. Tennessee works from IRC 2018 with its own amendments, and on the region's expansive clay a post-tensioned slab designed to PTI DC10.5 is the safer foundation. Year-round shop use there usually means baseboard heat, roughly $2,400 plus a dedicated sub-panel. Atlanta, GA, is the least expensive of the six markets at $49,000–$72,000, and the Stone-Base Modern Farmhouse fits its suburban lots. Its code basis is IRC 2018 with Georgia amendments and an ASCE 7-22 basic wind speed of 115 mph, and the deep red-clay subsoil needs proper preparation, a cost that is easy to underprice in an early bid.
Charlotte, NC, also suits the stone-base version, at $50,000–$74,000. North Carolina builds to the NC Residential Code 2018, and the IECC 2018 envelope rules only come into play if the owner insulates and conditions the building; setbacks and lot coverage differ from one jurisdiction to the next, so confirm them before deciding where the garage sits. Naples and Ft. Myers, FL, are the most expensive market at $72,000–$108,000, with the Coastal Tropical facade as the natural fit. The Florida Building Code 7th Edition applies, with HVHZ assemblies where the county requires them, which means impact glazing, a finish floor raised to the local flood map, a wind-rated overhead door and engineered uplift anchors at every porch column.
Each range covers the slab, framing, a dried-in shell with white board-and-batten siding, the wood overhead door, the shingled gable roof, basic electrical with surface lighting, the covered porch on its wood columns and standard permits. Left out are site clearing and grading, the electrical sub-feed from the house, climate control, plumbing, water and gas service, any restroom, custom storage millwork, slat-wall systems, an epoxy floor, a paver driveway and landscaping. Turning the shell into a conditioned room with insulation, drywall, a mini-split, water and a small half-bath typically adds $14,000 to $28,000, depending on the market and the distance to the house's service drop, and an insulated carriage-style overhead door with full impact glazing adds $1,800 to $3,800. A steep site or a stone-heavy facade such as the Stone-Base or Rustic Craftsman direction will push the total past the upper figure. The estimates draw on the NAHB construction cost survey and the RSMeans 2026 Q1 City Cost Indexes, both cited in the Sources section below.
Frequently Asked Questions
What is the total square footage of Plan 67849MG?
The detached garage encloses 476 square feet under a single-bay roof with 9-foot-4 interior ceilings. The covered porch adds 168 square feet (28 feet by 6 feet) of unconditioned, roofed outdoor space along the side elevation, for a combined 644 square feet under roof.
How many vehicles does this plan accommodate?
The plan is drawn as a one-car structure with a single 10-foot-by-8-foot overhead door. The 16-foot interior width and 27-foot depth can accept a full-size pickup or contractor van with room for tool storage along the side walls, but it is not a two-car footprint without redrawing.
Can this plan be used as an ADU or guest cottage?
Not as drawn. The plan has zero heated square footage, zero plumbing, and zero bedrooms or bathrooms; it is a detached accessory structure intended for vehicle storage, workshop, or covered outdoor work. Converting it to an ADU requires adding insulation, climate control, plumbing, a bathroom, and habitable-space framing changes, which is a separate scope and typically requires re-permitting under the residential code rather than the accessory-building code.
Will the 10-by-8 overhead door fit a full-size truck?
Yes. A stock full-size pickup, contractor van, or tall SUV clears the 10-foot-wide by 8-foot-tall opening with margin. Lifted trucks with light bars, RVs, or anything over 7-foot-9 in measured roof height should be measured before committing to the standard door height; the plan can typically be adjusted to a 9-foot door if specified before framing.
Is the covered porch usable in winter?
It is roofed and protected from rain and direct sun, but it is uninsulated and open on the long edge, so it functions as a three-season space in Charleston, Atlanta, Savannah, Naples, and Charlotte and as an occasional-use space in Nashville or higher-elevation Blue Ridge sites. The usual approach on similar outbuildings is a portable infrared or propane heater for winter shoulder hours rather than enclosing the porch, since enclosing it changes the structure's permitted classification in most jurisdictions.
Sources & References
- Architectural Designs, Plan 67849MG listing: original plan specifications, square footage, room dimensions, ceiling height, and licensed elevations used as the basis for this review.
- NAHB Construction Cost Survey: national and regional median per-square-foot construction cost data used as the lower-bound anchor for the build-cost ranges.
- RSMeans 2026 Q1 City Cost Indexes: city-level cost multipliers applied to the NAHB national medians to derive Charleston, Savannah, Nashville, Atlanta, Charlotte, and Naples ranges.
- International Residential Code (IRC) 2018 & 2021 editions, Appendix Q (Accessory Buildings): referenced for envelope, structural, and permitting requirements applied state by state for detached accessory structures.
- Florida Building Code, 7th Edition (FBC 2023): basis for HVHZ impact glazing, raised finish-floor, overhead door wind-rating, and porch column uplift anchor guidance in the Naples and Ft. Myers row.
- ASCE 7-22 Minimum Design Loads for Buildings: used for windload and porch column uplift references in coastal markets.
- IECC 2018 & 2021, Climate Zones 2A, 3A, and 4A: envelope performance targets cited when owners elect to add insulation and climate control.
- Post-Tensioning Institute DC10.5: basis for the slab recommendation in expansive-soil markets such as Nashville and Atlanta.
- NFPA 70 National Electrical Code, Article 225 (Outside Branch Circuits and Feeders): referenced for the sub-feed run from primary residence to detached outbuilding.
Who Plan 67849MG Suits
Plan 67849MG is the kind of small outbuilding we are happy to recommend to readers in Charleston, Savannah, Nashville, Charlotte, and the wider Southern market who need a designed accessory structure rather than a stamped-out metal kit. The Modern Farmhouse envelope, 9-foot-4 ceilings, 10-by-8 overhead door, and 168 SF covered porch turn what could be a generic garage into a property's secondary architectural statement, and the open interior leaves the operating program (one-car garage, workshop, garden room, hobby studio, golf-cart and tool storage) firmly in the owner's hands. The trade-off to understand before purchase is that this is an accessory structure as drawn, not an ADU; converting it into habitable space is a separate scope and a separate permit. If you are eventually planning to fit it out as a workshop or studio, our walk through eleven workspace transformations shows design directions for that kind of room, and for a comparable Modern Farmhouse plan with a full bonus space sitting above the garage rather than detached from it, the modern French Country ranch with bonus space over the garage is the next plan to look at.
House Plans Desk
The Layered Homes editorial teamThe House Plans Desk reviews published house plans from the designer’s drawings and listing: how the layout lives, what works, what to watch, and what it is likely to cost to build in 2026.
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