156 Congress St, Belfast, Maine

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Added On:06/23/2026
Last Updated:06/23/2026
One-of-a-Kind Net-Zero Home | 25kW Solar • 7 Heat Pumps for Heating & AC • Backup Systems and Generator • 50' Sunroom • Secret Rooms • 1/2 mile to Belfast Waterfront
Energy Efficient HomeSolar Panels
$1,750,000Asking Price (USD)
$12,224Annual Property Tax
4,775Square Feet
4 / 4Beds / Baths
1.2 acresLot Size
2023Year Built
Single Family HomeProperty Type

Listing ID : 27683

Property Description

Set in the beautiful coastal town of Belfast, this thoughtfully designed, one-of-a-kind 3-4 bedroom, 3.5 bath home blends striking architecture with sustainable, net-zero living. Built for efficiency, durability, and year-round comfort, it offers a rare combination of innovation and livability. Inside, the home features a spacious, flexible layout highlighted by a remarkable 50' x 15' heated sunroom along the south side--an inviting, light-filled space that naturally warms the home in winter while remaining comfortable in summer. Open living areas provide a seamless flow for everyday living and entertaining. The commercial-ready kitchen offers exceptional functionality for serious cooking or potential business use. A large family room with mini kitchen and access to a covered porch creates an ideal gathering space for indoor-outdoor living. Adding to the home's character are several ''secret'' rooms hidden behind custom bookcases. Designed for long-term performance, the home includes an arctic slab foundation for temperature stability, closed-cell insulation, and strategic orientation to maximize seasonal sunlight. Redundant systems--including heat pumps, a propane Generac generator, and a wood stove--add efficiency and peace of mind. A 25kW solar array powers the home, often resulting in minimal to no utility bills. The roof design enhances efficiency with reflective materials for summer cooling and snow retention for winter insulation. Outdoors, enjoy a large fenced backyard and trails through the wooded portion of the lot. A 2-car attached garage adds convenience. Home is being sold furnished, so you can move right in! All just walking distance from the Belfast waterfront downtown. (Note: This property has a 3BR septic design.)

Home Energy Evaluation

Glazing: N/A

Installed Appliances:
  1. Heat Pump (Air-source) was installed in 2023 with seer rating Unknown

Air Sealed: No

Energy-Star Appliances: Refrigerator, Stove, Clothes Washing Machine, Clothes Dryer, Dishwasher

Tankless Water Heater Installed: No


Home Health Evaluation

Water Purity: no

Air Purity: no

Radon Test Date: ,

Wall Finishes: N/A


Mortgage Calculator

Purchase Price ($)Down Payment
%
Loan Amount
$1,400,000
Annual Interest Rate
%
Loan Term (years)
Estimated Monthly Mortgage Payment
$8,757.08

Listing ID : 27683