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DCD Design Cost Data

Granny Flat - Fairfield County, Connecticut

William Leavy Architecture, PLLC

Posted: March 1, 2022 | Projects

Granny flats, or accessory dwelling units (ADUs), are more popular  now than ever and their construction has skyrocketed during the pandemic. In the past, the reasons for building one were to increase the value of the property, generate rental income,  or use as a guesthouse. But with increasing  doubt about care facilities, the prime  usage now is to provide a home for the  existing homeowners’ aging parents.  

Photo Courtesy of WL Architecture

On this project, the architect worked  closely with the owner regarding their  vision, as well as the zoning process, which included communicating and selling the idea to neighbors. This  neighborhood was developed right after World War II and had remained single family zoning for over 70 years, so the permitting was no small feat. The county allowed the additional dwelling, and others on the street have fallen suit. Since zoning required a kitchen, this was also incorporated into the design.  

A considerable amount of earthwork was required before and after the actual construction. A 4-foot change in elevation on the site in the area of the addition necessitated a swale and a retaining wall to manage stormwater run-off.  

Flexibility for usage was achieved by building a one-floor dwelling that is ADA compliant, and the exterior stairs at the entrance can be converted to a ramp; adding a house elevator or stair-lift will also be possible when and if needed to access the basement area. The finished basement (with a built-in dehumidifier) boasts a full bath and bedroom/office, with a Bilco walk-out bulkhead for the required emergency egress.  

The flat features two-zoned heating and cooling and separate electric  metering. The cathedral ceiling in the living area provides a spacious feel, and the hardwood floors and trim match that of the main residence.  

Vinyl windows and doors with high R-value, an architectural asphalt shingle roof, and low maintenance exterior with the vinyl siding matching the existing house, a TimberTech- composite deck, and Azek trim were used to reduce the need for exterior maintenance.

William Leavy Architecture, PLLC
101 Millard Street
Fairfield, CT 06824

General Contractor
Associated Design & Development
13 Hillston Road
Trumbull, CT 06611

Location: Fairfield County, Connecticut
Date Bid: June 2020
Construction Period: Sep 2020 to Jun 2021
Site: .75 acre.
Total Square Feet: 1,800*
Building Sizes: Basement, 900; first floor, 900; total, 1,800* square feet.
Building Height: Basement, 9'; first floor, 8' to 12'; total, 12'.
Number of Buildings: One.
Basic Construction Type: Addition.
Foundation: Cast-in-place.
Exterior Walls: Wood.
Roof: Asphalt shingle.
Floors: Concrete.
Interior Walls: Wood stud drywall.

Click here to view the full cost details for this project in the March/April 2022 issue of DCD