Accessory Dwelling Unit Build in Keaau, HI

Most residentially zoned lots in Keaau are eligible for at least one ADU under Hawaii County's updated rules. Hawaii County Bill 123 now allows up to three ADUs per parcel, depending on zoning and lot conditions.

A detached ADU is a separate freestanding structure on your lot, while an attached ADU shares a wall with your main home. Both are fully self-contained units with their own kitchen and living space, and Barrett Construction Services builds either type across the Hilo and Keaau area.

Wastewater capacity for your lot is evaluated based on total bedroom count across all structures, not just the number of buildings. State Act 224 updated how septic systems are assessed for multi-dwelling lots, so your specific property conditions will determine what is required.

Yes, housing extended family is one of the most common reasons Big Island homeowners build an ADU. A detached ohana unit gives family members their own space while keeping everyone on the same property.

An ADU is a fully independent unit with its own kitchen, bathroom, and entrance, while a home addition expands your existing living space without creating a separate dwelling. Barrett Construction Services builds ADUs as complete standalone homes on your Keaau or Hilo area lot.

Yes, we build ADUs throughout Keaau, Hilo, Mountain View, Waiakea, Volcano, Hawaiian Paradise Park, Ainaloa, Kurtistown, Kaumana, Waimea, and Waikoloa. Contact us to discuss your specific property and what your lot can support.