ADU Building Services by Heartwood Builders in Seattle
Heartwood Builders is a Seattle-based ADU contractor that helps homeowners expand their living space through the construction of attached and detached accessory dwelling units (AADUs and DADUs). Whether the goal is to house aging parents, provide space for college-aged children, or accommodate frequent guests, building an accessory dwelling unit can offer a practical solution that maintains privacy for everyone involved.
An accessory dwelling unit (ADU) is a self-contained living space located on a property that already has a primary residential unit. These secondary units must include living, sleeping, cooking, and bathroom facilities. They cannot be sold separately from the main home. ADUs are commonly used to house family members or to generate rental income through short-term leases or platforms like Airbnb.
Types of ADUs Heartwood Builders Constructs
As an experienced ADU builder in Seattle, Heartwood Builders works with homeowners to construct a range of accessory dwelling unit types on existing lots. The types they build include:
- Backyard cottages — detached structures situated on the rear of a property
- Mother-in-law suites — attached or interior units designed for family members
- Basement ADUs — conversions of existing below-grade space into livable units
- Attached ADUs — units connected to the primary residence
- Income-generating DADUs or AADUs — units suitable for short-term or long-term rental
Each project is approached with attention to the homeowner's specific lot conditions, goals, and Seattle's local regulations. Most ADUs in Seattle range from approximately 400 to 800 square feet, a size that typically balances functional living space with city zoning requirements.
Heartwood Builders also assists clients with the permitting process. Building or legalizing an ADU in Seattle requires a construction addition or alteration permit, and in some cases, applications for electrical service changes through Seattle City Light may also be necessary. Their team works to ensure that new structures meet all applicable local regulations.
Sustainability and Practical Benefits
Heartwood Builders places an emphasis on sustainable construction practices. They work with new, sustainable, or recycled materials and methods with the aim of building structures that are durable and environmentally considerate. ADUs, by their nature, tend to require fewer resources and less land than standalone single-family homes. Their smaller footprint also means lower energy demands for heating and cooling, which can reduce utility costs over time.
Beyond sustainability, there are several practical reasons homeowners consider adding an accessory dwelling unit to their property:
- Family accommodations: An independent living space allows family members or guests to stay nearby while maintaining their own privacy.
- Increased property value: An ADU can contribute to the overall market value of a home.
- Rental income: A detached or attached ADU can be rented out to help offset mortgage costs or generate additional income.
- Efficient land use: ADUs make use of existing lots without requiring additional land acquisition.
Heartwood Builders operates Monday through Friday and serves homeowners throughout the Seattle area looking to add functional, well-built secondary living spaces to their properties.
