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ADUs in Franklin, MA

Three ready plans, 700, 800 and 900 square feet. Each is a full one-bedroom home. Pick one and we will build it.

  • Three plans: 700, 800 and 900 sq ft
  • Allowed by right in Massachusetts since 2025
  • One person running the whole build

Get a free ADU estimate

By submitting, you agree we may contact you by phone or email about your request. See our privacy policy and terms.

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The ADU collection

Three plans: 700, 800 and 900 sq ft

Each one is a full one-bedroom, one-bath home with an open kitchen and a cathedral ceiling. Pick the size that fits your lot; we can change finishes and details.

ADU 700

700 sq ft · 28' x 25' · 1 bed · 1 bath

ADU 700 floor plan: bedroom, bath with curbless shower, laundry, and an open living room and kitchen
ADU 700 floor plan, 28' x 25'. Tap to see it full size.
Rendering of the ADU 700: a one-story white board-and-batten cottage with a black metal roof and a cedar front porchRendering

Key features

  • Open living and kitchen with a cathedral ceiling
  • Reach-in bedroom closet
  • Linen and water heater closet
  • In-suite laundry
  • Curbless shower and a 6' double vanity
  • Efficient, open layout
Start with the ADU 700
  • Rendering of the ADU 700 living room and kitchen under a wood cathedral ceiling
    Living room and kitchen
  • Rendering of the ADU 700 bedroom with a queen bed and a large window
    Bedroom

ADU 800

798 sq ft · 28' x 28'-6" · 1 bed · 1 bath

ADU 800 floor plan: bedroom, bath with curbless shower, laundry, and an open living room and kitchen
ADU 800 floor plan, 28' x 28'-6". Tap to see it full size.
Rendering of the ADU 800: a one-story white board-and-batten cottage with a cedar gable and a covered front porchRendering

Key features

  • Open living and kitchen with a cathedral ceiling
  • Walk-in closet
  • Coat and mechanical closet at the entry
  • In-suite laundry
  • Optional gas fireplace location
  • Spacious 13'-6" x 15' bedroom
Start with the ADU 800
  • Rendering of the ADU 800 kitchen island and living room
    Kitchen and living room
  • Rendering of the ADU 800 bathroom with a curbless glass shower and a double vanity
    Bathroom

ADU 900

896 sq ft · 28' x 32' · 1 bed · 1 bath

ADU 900 floor plan: bedroom, bath with curbless shower, laundry, and an open living room and kitchen
ADU 900 floor plan, 28' x 32'. Tap to see it full size.
Rendering of the ADU 900: a one-story white board-and-batten cottage with a full-width cedar porch and two doorsRendering

Key features

  • Open living and kitchen with a cathedral ceiling
  • Walk-in closet (9' x 6'-6")
  • Mudroom with a bench
  • Pantry
  • Mechanical and storage room
  • In-suite laundry
Start with the ADU 900
  • Rendering of the ADU 900 mudroom with a built-in bench, hooks and baskets
    Mudroom
  • Rendering of the ADU 900 walk-in pantry with white shelving
    Pantry

The pictures are renderings of Conley Construction's three ADU plans, to show the layout and finish. Yours is built to fit your lot and your house.

Tell us about your ADU

Pick a plan above or describe what you have in mind.

By submitting, you agree we may contact you by phone or email about your request. See our privacy policy and terms.

The Massachusetts rules

The state made ADUs easy to build

  • Since 2 February 2025, Massachusetts lets you build one ADU by right on a single-family lot: no special permit or variance.
  • It can be up to 900 square feet, or half the size of the main house, whichever is smaller.
  • Your town can't require a parking space for it if you are within half a mile of a commuter rail, subway, ferry or bus station.

Source: mass.gov, Accessory Dwelling Units. We build in Franklin, Wrentham, Norfolk, Medway, Bellingham, Millis and the towns around them.

Questions people ask

Do I need a special permit to build an ADU in Massachusetts?

Not for one ADU on a single-family lot. Since 2 February 2025 it is allowed by right, within the state's size cap. You still need a building permit, and Christian will walk you through what Franklin or your town asks for.

How big can an ADU be?

Up to 900 square feet, or half the size of the main house, whichever is smaller. All three plans fit under 900; if your house is under 1,800 square feet, the half-size rule may point you to the ADU 700 or 800.

Can I start from one of these plans and change it?

Yes. They are starting points. Pick the one closest to what you want and tell us what you would change; Christian will come look at the lot and the house.

Who draws the plans?

When a job needs blueprints, Christian works with partners who draft them, so the plans and the build stay on one track.

Ready to add an ADU?

Pick a plan or just tell us about your lot.

See the plans(774) 291-2643
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