Any investor weighing a duplex plan should start with one question: "Will tenants actually want to live in this, on both sides, for years?" Plan 25077DH sits in the most defensible part of the Southern duplex market: 2,680 total heated square feet split into two mirrored single-story units, each delivering three real bedrooms, two full baths, a one-car attached garage, a covered front porch, and an open great room with 9-foot ceilings. The 94-foot by 44-foot footprint is wide rather than deep, which is exactly the shape that flexes onto the long suburban or rural lots Southern investors actually own. The plan does the things that earn long-term tenants (a split-bedroom layout that pulls the owner suite away from the secondary bedrooms, a defined laundry room rather than a closet-stack, and per-unit garage parking) while keeping the rectangular massing simple enough that framing crews, roofers, and trim carpenters can run repeating details across both halves without redrawing for each side.
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Floor Plan
Main Level
The plan is a mirrored duplex organized along a shared central party wall, with the two one-car garages set side by side at the middle of the front elevation. That is the structural decision to notice first: the garages occupy the front center, and directly behind each one sits the 14-0 by 12-0 primary bedroom, so the two primary bedrooms back onto each other across the party wall while the great rooms and secondary bedrooms take the outboard ends. Each unit enters from a 5-foot-6-deep covered porch directly into a 20-foot-by-15-foot great room flowing into a 12-foot-by-15-foot-6 kitchen and dining zone. A defined 8-foot-by-6-foot-6 laundry room sits at the rear between the kitchen and the second bedroom, a few steps from the door to the optional patio. It is a real laundry room, not a stacked-closet, which matters for tenant retention in family-sized units. The primary suite occupies the rear corner of each unit, behind the garage and against the party wall, with private bath access; two secondary bedrooms sit across the unit and share a hall bath. The garage is sized at 14 feet by 20 feet, which is workable for a mid-size sedan or compact crossover plus narrow tool storage along one wall, but worth knowing before you assume it accepts a full-size pickup. For a tighter four-bedroom ranch duplex comparison at a smaller footprint, our review of the four-bedroom modern ranch duplex covers the same investor logic on a different scale.
Exterior Renderings
The renderings put the duplex under one long gable roof in standing-seam metal, with a smaller front gable over the paired garage bays. That gable earns its place, because it interrupts the 94-foot run that would otherwise read as a long bar building. Charcoal board-and-batten covers the walls, white trim outlines the windows and eaves, and the carriage-style garage doors and porch posts are stained natural wood, while each unit keeps its own covered porch and front door. Those twin porches are what make the building read as two homes from the curb rather than one stretched bar, which matters for tenant pride and for resale. At the back, each unit gets a pair of French doors onto its own paver patio, and one rendering adds a short wood privacy screen between the two. We would build that screen rather than leave it optional, since side-by-side patios with no separation put two households in full view of each other. The simple main roof also keeps framing and gutter runs straightforward, so the builder's per-square-foot cost stays closer to a single-family equivalent than a stepped or hipped duplex roof would allow.
Interior Renderings
The interior renderings settle into the right material palette for a tenant-grade Southern duplex: medium-tone wood-look flooring run continuously through the living zones, soft warm-gray walls, white shaker-style cabinetry, marble-look quartz or porcelain counters, and oil-rubbed bronze or aged brass hardware to keep the warmth from going cold. The 9-foot ceilings carry the open great-room-to-kitchen sightline without compression, which is the single detail that makes a 1,340-square-foot unit feel like a home rather than a stretched apartment. Kitchens run perimeter cabinetry with the laundry door tucked behind the cooking wall, a real workflow improvement for households with kids' sports gear and weekly bedding rotations. Primary baths use white vanities with marble-look tops, and the secondary bath repeats the same finish vocabulary so the unit reads as one continuous specification rather than two compromise zones. Window placement is concentrated on the front and rear elevations, which is forced by the attached side walls; owners should plan light-color paint and well-placed mirrors on the interior side walls to compensate, especially in the secondary bedrooms. For a finish-direction tour that moves this kind of restrained palette toward a quieter, higher-end feel, our walk-through of designing a quiet luxury kitchen with understated elegance covers the cabinetry and counter decisions that move a tenant-grade kitchen toward an owner-occupant kitchen.
What Works & What to Weigh
What Works
Each unit is single-story, which eliminates stairs and supports long-term tenants, aging-in-place owners and ADA-friendly modifications. Across the two mirrored units, the six total bedrooms cover families, tenants, college-rental markets and multi-generational housing. Inside each half, a split-bedroom arrangement separates the primary suite from the secondary bedrooms, and 9-foot ceilings in the main living areas keep the modest per-unit footprint open and well proportioned. Defined laundry rooms next to the kitchens, rather than closet stacks, materially improve tenant retention.
The exterior planning is just as considered. A one-car garage and covered front porch for each unit maintain a true two-home read from the street, and the garages buffer the front half of the party wall, though the two primary bedrooms meet across it at the rear, which is why the acoustic upgrade below matters. The rectangular footprint with an unbroken roofline streamlines framing, roofing and trim labor across both halves, which helps keep the build cost predictable.
Where Plan 25077DH Asks for Compromise
Space per unit is the first limit. At 1,340 SF, each unit is functional but tight for a family with three children, so secondary bedroom storage has to be planned with closet systems or bed frames with drawers. The single-car attached garage per unit will need supplemental storage for outdoor equipment, bikes and lawn tools in markets without basements, and the 14-foot-by-20-foot garage bays accept sedans and compact SUVs comfortably but are tight for full-size pickups with extended cabs.
The attached construction brings two technical issues. The shared central party wall requires enhanced acoustic detail; staggered studs, double drywall with Green Glue, or an STC-rated assembly are not in the base plan and should be specified. Side-wall fenestration is also restricted, so natural light inside depends on front and rear glazing.
Budget and zoning finish the list. Rear patios are drawn as optional and add roughly $4,500 to $11,000 per unit in 2026, depending on size, paver choice and grading. Duplex zoning is not universal in the Southeast, so verify the parcel's permitted use, lot coverage and parking minimums before purchase, especially in incorporated towns and HOA-governed subdivisions.
Facade Variations: Design Proposals
The seven facade directions below are our own design commentary on how Plan 25077DH could be finished to suit different sites and tenant profiles; they are not options offered by the original plan set. Use them as references when you sit down with your builder, architect, or designer to settle siding, roofing, trim, and landscape palette for the duplex.
Mountain Rustic Stone
Dark stacked stone veneer paired with a matte black standing-seam metal roof, natural wood garage doors, and stained wood entry columns. The landscape leans on native grasses, perennial wildflowers, and gravel driveways edged in cut stone. This is the right direction for owners building in the North Carolina mountains around Boone and Asheville, the Tennessee plateau, or the wooded ridges around Greenville-Travelers Rest, where the duplex needs material weight to belong on its setting and where rental demand from second-home and college markets supports a higher finish bar.
Charcoal stacked stone covers the gable and walls, matched by a black standing-seam roof and black window frames. Against that cool, heavy base the reclaimed wood garage doors, shutters and porch posts carry a warm russet tone, and the grey exposed aggregate drive with slate banding keeps the paving in the same cool register as the stone.
Painted Brick Traditional
This version trades the plan's dark siding for white painted brick under a charcoal shingle roof, with navy louvered shutters and copper gutters that will weather to a patina. The landscape is structured rather than loose: clipped boxwoods down the center island between the two drives, mophead hydrangeas and Japanese maples at the corners, and a stamped concrete driveway edged in granite setts. We would point Charlotte, Raleigh-Durham and Atlanta investors toward it when the target tenant is a family or a relocating professional rather than a student renter, because painted brick looks solid and well kept from the street.
Painted white brick and a charcoal shingle roof set a classic two-value base, and the navy louvered shutters add a third colour that should be sampled against the brick in shade. Copper gutters and lanterns warm the eave line, the honey wood garage doors pick up that warmth lower down, and blue hydrangeas repeat the shutter colour in the beds.
European Stone Estate
Light-colored natural stone cladding combined with vertical wood slat panels around the garage bays to introduce rhythm and break the duplex symmetry without splitting the roofline. Integrated landscape uplighting, path lighting, and mixed perennial beds with purple flowering varieties soften the masonry. This direction works for owner-occupied house-hackers in the Charlotte SouthPark and Atlanta Buckhead inner suburbs, where the owner lives in one unit, rents the other, and needs the property to read as a single estate-grade home rather than a visible rental.
Buff limestone with honey and grey variation covers most of the walls and the gable, and the vertical teak-toned slats around the garage bays and entries are stained a shade deeper. A charcoal standing-seam roof, bronze window frames and pale bluestone paving finish it, so choose the wood stain with a stone sample in hand.
Zen Minimalist
Smooth white stucco walls, a dark metal roof, and a restrained Japanese-influenced landscape: sculpted evergreens, moss mounds, raked gravel, and dark river stone. The absence of seasonal flowering beds reduces ongoing landscape spend, which matters for an investor budgeting per-unit operating costs. This option suits in-town infill duplex lots in Nashville East Bank, Atlanta Beltline-adjacent neighborhoods, and Charleston peninsula side streets, small lots where the front yard is part of the architecture rather than a traditional lawn.
Soft off-white stucco and a charcoal standing-seam roof form a quiet two-tone shell. The honey wood carriage garage doors and porch posts are the only warm material, black window frames keep the openings crisp, and the landscape works in greys: pale raked gravel, black river stones and deep green moss mounds.
Desert Contemporary
White stucco massing combined with dark wood siding and full-view aluminum-and-glass garage doors. The landscape commits to xeriscape: barrel cacti, agave, and drought-tolerant grasses set in decomposed granite and sand. This sits outside the Southeastern markets covered here; it is a transplant direction for investors building in Scottsdale, Tucson, or Las Vegas where the climate demands heat-tolerant plantings, minimal irrigation, and a clean modern envelope that holds up to UV exposure better than horizontal lap siding.
Warm white stucco wings frame a charcoal board-clad garage block, and red cedar slats line both entry recesses. Black standing-seam metal, black window frames and frosted glass garage doors in black aluminium tie the dark elements together, while the sandy decomposed granite and blue-grey agave stay close in temperature to the stucco.
Classic Colonial Revival
White horizontal clapboard, a blue-grey shingle roof, a herringbone brick driveway and wood carriage-style garage doors make up the traditional vocabulary here. The planting is formal, with boxwood parterres down the center island holding white rose standards and clipped hedges wrapping each porch bed. We would specify it in historic-adjacent neighborhoods such as Savannah's Ardsley Park, Charleston's West Ashley or Williamsburg VA, or anywhere an architectural review board expects traditional detailing and would turn down a modernist envelope.
White clapboard under a blue-grey shingle roof makes a cool, light envelope, and the warm materials all sit low or at the edges. Mahogany garage and entry doors, copper gutters and a copper band over the garage, and the red-brown herringbone brick drive belong to one family, so sample the door stain beside the actual paving brick before ordering.
Scandinavian Modern Farmhouse
Bleached natural wood boards and a matte black standing-seam roof set up the contrast, and a black frame boxed around the two garage bays marks the split between the units as a single bold shape. The landscape is pared back to a row of clipped boxwood spheres down the drive, raised corten planters and drifts of ornamental grass. We would point Nashville Wedgewood-Houston, Atlanta West Midtown and Charlotte NoDa investors toward this one when the target tenant is a younger professional who values architectural presence over traditional curb appeal, or when the units will be photographed for short-term rental listings, where pale wood and black frames read clearly on screen.
Bleached grey-white vertical boards wrap the walls and gable, while a black standing-seam roof and a matte black portal around the garages draw a hard graphic line. Walnut-stained X-brace garage doors bring the warm middle tone, and the rusted steel planters along the drive repeat it at ground level without adding another colour.
Regional Fit & 2026 Build-Cost Context
Plan 25077DH belongs in the Southern duplex markets where lot widths support a 94-foot-by-44-foot rectangle and where local zoning either permits two-family construction outright or allows it through a relatively short variance process. The figures below are total turnkey build costs for both units combined, the way investors should actually pencil this plan, rather than per-unit numbers, because shared foundation, shared roof, shared exterior envelope, and shared utility trenching make the per-unit cost lower than building two independent 1,340 SF homes. The ranges assume the 2,680 SF base plan with mid-grade finishes that match the renderings: fiber-cement or painted brick lap siding, asphalt shingle or standing-seam metal roofing, wood-look LVP flooring, white shaker cabinets with quartz or porcelain counters, white plumbing fixtures, and two of every appliance, water heater, HVAC unit, and electrical service.
Charleston, SC carries the highest allowance outside Florida, $525,000–$678,000 turnkey for both units, and Painted Brick Traditional is the facade we would pair with it. Wind design follows ASCE 7-22 and the code base is the IRC 2021 with South Carolina amendments; an STC-rated party wall should be treated as mandatory, and duplex zoning is worth checking early, since North Charleston and Summerville tend to be friendlier to two-family use than the peninsula. Savannah, GA comes in at $488,000–$625,000, with Classic Colonial Revival, the herringbone-brick version, as the natural fit. Georgia builds to the IRC 2018 with state amendments, a rain-screen gap behind lap siding is sensible in that humidity, and in historic-adjacent neighborhoods a traditional brick or clapboard envelope is the easiest path through review.
In Nashville, TN the allowance is $478,000–$612,000, and the Scandinavian Modern Farmhouse facade suits the city's newer infill streets. Tennessee works from the IRC 2018 with its own amendments, and on the region's expansive clay a PTI DC10.5 post-tensioned slab is strongly recommended; short-term-rental and Music Row commuter demand can justify a better finish level in some submarkets. Atlanta, GA sits lower at $452,000–$584,000, again with Painted Brick Traditional. The code base is IRC 2018 plus Georgia amendments, with an ASCE 7-22 basic wind speed of 115 mph, and parcel zoning needs a close read: the city's R-4A and R-5 districts allow a duplex by right, while R-3 and lower do not.
Charlotte, NC lands at $462,000–$598,000 with Painted Brick Traditional. Construction follows the NC Residential Code 2018 and an IECC 2018 envelope, and the city's UDO amendments through 2024 opened duplex-by-right in many districts that used to be single-family only, though that still has to be confirmed for the specific parcel before purchase. The top of the range belongs to Naples / Ft. Myers, FL, at $612,000–$792,000, where the European Stone Estate facade fits the market. The premium comes from the FBC 7th Ed. with HVHZ assemblies, impact glazing on every opening, a finish floor raised to the flood map and a party wall that must carry a two-hour fire rating; underwriting there should also allow for rising hurricane insurance.
Each range covers both halves of the building: foundation, framing and dried-in shell, mid-grade finishes, base mechanical and electrical, and the doubled items a duplex brings, meaning two HVAC systems, two water heaters, two kitchens, four bathrooms and the two one-car attached garages. Left out are the land, a well or septic system where one is needed, utility sub-feed and meter upgrades, impact and tap fees (usually charged twice for a duplex), demolition of anything already on the lot, detached storage, finished landscaping beyond basic sod, and the rear items the renderings show: the two paver patios, roughly $9,000 to $22,000 combined, and the privacy fencing between them. Moving the party wall from the base 2x4 fire-rated separation to the staggered-stud STC-55 assembly described in the FAQ below adds $6,000 to $11,000 on top. A sloped site or one of the stone-heavy facades, such as Mountain Rustic Stone or European Stone Estate, will push a budget past the upper figure. The ranges draw on the NAHB 2025 Construction Cost Survey (released 2026 Q1), the RSMeans 2026 Q1 City Cost Indexes and recent turnkey pricing for comparable side-by-side duplex plans; full citations are in the Sources section below.
Frequently Asked Questions
How is the 2,680 square feet divided between the two units?
The duplex is mirrored, so each unit delivers approximately 1,340 heated square feet: three bedrooms, two full bathrooms, a great room, a kitchen and dining zone, a defined laundry room, and a one-car attached garage. The covered front porches and the optional rear patios add unconditioned square footage that is not counted in the 2,680 total.
Is the central party wall already fire-rated and sound-insulated?
The base plan includes a code-minimum fire-rated separation between the two units, but it does not specify a high-STC acoustic assembly. For long-term tenant retention, we strongly recommend upgrading the party wall to a staggered-stud STC-55 assembly with double drywall and Green Glue on each side, typically a $6,000 to $11,000 add to the build cost depending on market.
Can this duplex be built on a standard suburban lot?
It needs a wide lot. The 94-foot by 44-foot footprint requires a buildable parcel with frontage typically over 110 feet after setbacks, which is wider than many standard subdivision lots in the Southeast. Larger custom-builder subdivisions, infill rural parcels, and intentionally-zoned two-family lots are the natural fit. Always verify lot coverage, setback, and duplex zoning before purchase.
Will the 14-by-20 garage fit a full-size pickup?
It will fit a standard-cab full-size pickup with limited maneuvering room, but it is tight for an extended-cab or crew-cab pickup parked alongside any tool storage. The 14-foot interior width is the constraining dimension. If your tenant profile includes contractors or rural truck owners, plan for them to park in the driveway and use the garage primarily for storage.
Does this plan support a house-hack strategy for an owner-occupant?
Yes, and that is where it tends to perform best. Living in one unit and renting the other typically qualifies the buyer for owner-occupant financing (FHA, conventional 5 percent down, or VA where eligible), which dramatically improves the down payment math compared to investor financing. The mirrored layout makes the rental side equivalent in size and finish to the owner side, so the operation does not feel like one premium unit and one budget unit.
Sources & References
- Architectural Designs, Plan 25077DH listing: original plan specifications, square footage, room dimensions, and licensed elevations used as the basis for this review.
- NAHB 2025 Construction Cost Survey (released 2026 Q1): 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, Section R302 (Fire-Resistant Construction): referenced for party wall fire-rating requirements between dwelling units in two-family construction.
- Florida Building Code, 7th Edition (FBC 2023): basis for HVHZ impact glazing, raised finish-floor, and two-hour party wall fire rating requirements in the Naples and Ft. Myers row.
- ASCE 7-22 Minimum Design Loads for Buildings: used for windload references in coastal markets and porch column uplift design.
- IECC 2018 & 2021, Climate Zones 2A, 3A, and 4A: envelope performance targets cited in the regional notes.
- Post-Tensioning Institute DC10.5: basis for the slab recommendation in expansive-soil markets such as Nashville and Atlanta.
- ICC A117.1 Accessible and Usable Buildings and Facilities: referenced for single-level aging-in-place planning notes.
- National Multifamily Housing Council 2026 Q1 Rent Survey: referenced for tenant retention and finish-bar discussion in the regional notes.
- Charlotte UDO (2023 with 2024 amendments) and City of Atlanta Zoning Ordinance: basis for the duplex-by-right zoning notes in the Charlotte and Atlanta rows.
Who Plan 25077DH Suits
Plan 25077DH is the kind of duplex we are comfortable recommending to Southern investors and owner-occupant house-hackers who want a single-story two-family plan that does not feel like a stretched apartment. The mirrored 1,340 SF units carry true three-bedroom programs with split-bedroom privacy, defined laundry rooms, per-unit garages, and an honest covered porch on each side: the four details that hold long-term tenants and protect resale value. The trade-offs to underwrite before you buy are the wide-lot requirement, the party wall acoustic upgrade that should be treated as non-optional, and the zoning verification step that should happen before earnest money. For a comparable single-story plan at a smaller four-bedroom duplex footprint, our analysis of the functional simplicity of the four-bedroom modern ranch duplex is the direct comparison. And if you want to see how the same restrained single-story logic carries onto a primary-residence farmhouse rather than a duplex, the modern French Country ranch with bonus space over the garage is the next plan to look at.
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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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