ADU House Plans - Architectural Designs

ADU House Plans

Our incredible selection of Accessory Dwelling Unit (ADU) house plans is designed to enhance your property with a functional and appealing additional living space. Also known as guest houses or detached in-law suites, ADU house plans offer homeowners a fantastic opportunity to expand their living area in a unique and stylish way.

ADU designs can offer extra living space without the need for construction on your main home. ADU floor plans are usually designed to maximize space in smaller homes. For instance, the kitchen might be small but have hi...

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Modern Farmhouse house plan exterior with dark siding, metal roof, brick foundation, and covered porch with seating.

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420132WNT

Plan Number

starting at

$995

980

Sq. Ft.

Bed

Bath

Story

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677030NWL

Plan Number

starting at

$799

$679.15

672

Sq. Ft.

Bed

Bath

Story

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420159WNT

Plan Number

starting at

$995

952

Sq. Ft.

Bed

Bath

Story

Cars

Modern Farmhouse exterior plan with metal roof, covered porch, and large grid windows.

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420134WNT

Plan Number

starting at

$995

952

Sq. Ft.

Bed

Bath

Story

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House plan exterior. Modern Farmhouse style with two stories, gabled roof, board and batten siding, and a covered porch with French doors.

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677031NWL

Plan Number

starting at

$899

$764.15

897

Sq. Ft.

Bed

Bath

Story

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420147WNT

Plan Number

starting at

$995

884

Sq. Ft.

Bed

Bath

Story

House plan exterior. Modern farmhouse style with gabled roof, two-car garage, dormers, and covered carport.

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270098AF

Plan Number

starting at

$995

$845.75

873

Sq. Ft.

Bed

Bath

Story

Cars

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750017LDG

Plan Number

starting at

$750

$637.50

1,165

Sq. Ft.

Bed

1.5

Bath

Story

Cars

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25833GE

Plan Number

starting at

$875

$743.75

498

Sq. Ft.

Bed

Bath

Story

Cars

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623198DJ

Plan Number

starting at

$1,399

$1,189.15

1,453

Sq. Ft.

Bed

1.5

Bath

Story

Cars

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62322DJ

Plan Number

starting at

$1,199

$1,019.15

807

Sq. Ft.

Bed

Bath

Story

Cars

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House plan exterior. One-story Modern Farmhouse with board and batten siding, gable roof, and black-framed French doors.

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677032NWL

Plan Number

starting at

$899

$764.15

800

Sq. Ft.

Bed

Bath

Story

House plan exterior. Two-car garage with gabled roof, dormer with windows, and horizontal siding. White trim and garage doors.

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50220PH

Plan Number

starting at

$1,095

$930.75

640

Sq. Ft.

Bed

Bath

Story

Cars

House plan exterior. Modern farmhouse style with gabled roof, covered porch, and board-and-batten siding. Includes two windows and front door.

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337003JUN

Plan Number

starting at

$995

844

Sq. Ft.

Bed

Bath

Story

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61718UT

Plan Number

starting at

$700

$595

616

Sq. Ft.

Bed

1.5

Bath

Story

Cars

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House plan exterior. Modern style, single-story home with a shed roof, exposed beams, and a covered patio area.

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677033NWL

Plan Number

starting at

$899

$764.15

800

Sq. Ft.

Bed

Bath

Story

House plan exterior with two-car garage, gable roof, and two stories. Features a shed-style awning over garage doors and gray shutters.

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765010TWN

Plan Number

starting at

$975

$828.75

650

Sq. Ft.

Bed

Bath

Story

Cars

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50213PH

Plan Number

starting at

$1,095

$930.75

572

Sq. Ft.

Bed

Bath

Story

Cars

House plan exterior. Modern farmhouse style with gabled roof, dormer windows, and covered porch. Features a swimming pool.

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270072AF

Plan Number

starting at

$575

$488.75

1,050

Sq. Ft.

Bed

Bath

Story

Modern Farmhouse house plan exterior with white siding, gables, wood trim, and a covered entry with a bench.

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420126WNT

Plan Number

starting at

$995

506

Sq. Ft.

Bed

Bath

Story

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House plan exterior. Modern A-frame style with a gabled roof and a wall of windows. Includes a patio with outdoor seating and a fire pit.

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623405DJ

Plan Number

starting at

$899

$764.15

654

Sq. Ft.

Bed

Bath

Story

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420117WNT

Plan Number

starting at

$995

578

Sq. Ft.

Bed

Bath

Story

House plan exterior. Modern style with a slanted roof, three-car garage, and large, multi-pane window feature.

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61398UT

Plan Number

starting at

$700

$595

1,207

Sq. Ft.

Bed

1.5

Bath

Story

Cars

House plan exterior with two-car garage. Features include board and batten siding, gable rooflines, and a shingle-clad gable end.

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270022AF

Plan Number

starting at

$995

$845.75

909

Sq. Ft.

Bed

Bath

Story

Cars

ADU House Plans FAQs

What is an Accessory Dwelling Unit (ADU)?

An Accessory Dwelling Unit (ADU) is a secondary residential unit located on the same property as a primary residence. ADUs go by various names, such as granny flats, in-law suites, secondary suites, or backyard cottages. These units are fully equipped with their own kitchen, bathroom, and sleeping facilities, providing a separate living space from the main dwelling. ADUs can take different forms, including converted garages, basement apartments, separate structures in the backyard, or additions to the main house. They offer a way to create additional housing options within existing neighborhoods, helping to address housing shortages and provide more affordable housing solutions.

Are there special regulations or zoning requirements for ADUs?

The regulations and zoning requirements for ADUs vary by location, and not all areas permit or regulate them in the same way. Many places have zoning laws governing ADU construction, including size restrictions, setback requirements, and occupancy regulations.

How are ADUs typically used?

Some common reasons for building ADUs include providing housing for family members, generating rental income, or addressing changing housing needs. ADUs are seen as a flexible and sustainable housing option, utilizing existing infrastructure and land while contributing to increased housing density.

How did the concept of Accessory Dwelling Units originate?

The idea of ADUs emerged as a response to housing shortages and the need for flexible living arrangements. It gained prominence in the mid-20th century as a way to maximize land use.

What are the key characteristics of ADU architectural plans?

ADU plans emphasize efficient use of space, often incorporating features like open floor plans, compact kitchens, and multifunctional living areas.

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Total Heated Area (Sq. Ft.)

Bedrooms

Bathrooms

Plan Type

Single-Family Homes

550

Stand-Alone Garages

243

Multi-Family Homes (duplexes, triplexes, and other multi-unit layouts)

Other (sheds, pool houses, offices)

Footprint

Width (feet)

Depth (feet)

Height (feet)

Floors

Styles

Modern Farmhouse

Scandinavian

Craftsman

170

Barndominium

Transitional

Contemporary

145

Country

353

Mid Century Modern

New American

102

Cottage

364

More Styles

A-Frame

Acadian

Adobe

Beach

Bungalow

Cabin

121

Cape Cod

Carriage

276

Coastal

Coastal Contemporary

Colonial

European

Farmhouse

Florida-Style

French Country

Georgian

Hill Country

Log Cabin

Louisiana-Style

Low Country

Mediterranean

Modern

102

Mountain

New Orleans

Northwest

Prairie

Ranch

Rustic

114

Shingle

Southern

Southern Traditional

Southwest

Spanish

Traditional

217

Tudor

Tuscan

Vacation

189

Victorian

Number of Vehicles

215

100

Garage Type

Standard

Attached

Detached

204

Carport

Driveunder

RV Garage

None

398

Garage Location

Front

328

Side

Rear

Courtyard

Bedroom and Bath Options

Bedrooms - Clustered

145

Bedrooms - Split

Master Suite - 1st Floor

425

Master Suite - Upstairs

300

Master Suite - Lower Level

Master Suite - Sitting Area

Two Master Suites

In-Law Suite

Jack & Jill Bath

Bunk Room

Kitchen and Dining

Breakfast Nook

Two Kitchen Islands

Walk-in Pantry

Butlery

Formal Dining

Laundry Location

Laundry Access from Master Suite

Laundry - Main Level

426

Laundry - Upstairs

174

Laundry - Lower Level

Laundry Chute

Additional Rooms

Optionally Finished Bonus Room

Den

Flex Room

Game/Rec Room

Home Office

Home Theater

Keeping Room

Library/Study

Loft

Media Room

Mudroom

Playroom

Safe Room

Sport Court

Sunroom

Two Story Great Room

Wet Bar

Wine Room

Outdoor Features

Wraparound Porch

Outdoor Fireplace

Outdoor Kitchen

Rooftop Deck

Courtyard

Stacked Porches

Foundation

Basement

187

Combo Basement-Crawl

Combo Slab-Crawl

Crawl

370

Daylight

Joist

Monolithic Slab

Pier

Piling

Post/Beam

Post Frame

Post/Pier

Raise Island

Slab

685

Stem Wall

Walkout

102

Special Features

Accessible Design

Casita

Elevator

Finished Bonus Room

Multiple Stairs

Split Level

More Special Features

Exterior Walls

Block / CMU (main floor)

2x4

327

2x6

708

2x8

ICF

2x4 and 2x6

Log

Metal

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Home Office Studio

Large

Materials List

672

Metric

Multi-Generational

On Sale

544

Pool House

Post-Frame

Premium Collection

Recently Sold

508

Shed

Timber Frame

USDA Approved

Lot Features

Narrow Lot

743

Front/Up Sloping

Rear Sloping

Side Sloping

Sloping Lot