ADU Construction Services by Greater Seattle Remodeling
Greater Seattle Remodeling helps homeowners in the Seattle metro area add functional, code-compliant living space to their existing properties through accessory dwelling unit construction. Whether the goal is housing a family member, creating a guest space, or generating rental income, they work with homeowners to identify the right ADU solution for their lot, budget, and local zoning requirements.
An accessory dwelling unit is a self-contained home built on the same lot as a primary residence. In Seattle, this can take several forms — a detached ADU, an attached or internal ADU, or a garage conversion. Greater Seattle Remodeling helps clients navigate feasibility, site work, utility connections, permits, and local building codes so the finished unit is move-in ready and fully compliant.
Their services are suited to most single-family home properties and select manufactured home sites across the Seattle area, from Phinney Ridge to Mercer Island.
ADU Types Greater Seattle Remodeling Works With
Because every lot is different, Greater Seattle Remodeling helps homeowners compare ADU options based on their specific site conditions, budget, and applicable zoning regulations. The main types they work with include:
- Detached ADUs (DADUs): A new, standalone backyard cottage or granny flat built on the existing property. This option is well suited for rental income or providing privacy for family members. The process covers site conditions, drainage, setbacks, utility connections, and permit acquisition.
- Attached and Internal ADUs: Converting existing space within the primary residence — such as a basement apartment — into a separate dwelling unit. This is often a more cost-effective route. The scope includes a separate entrance, egress, utility tie-ins, and compliance with Seattle building codes.
- Garage Conversions and Carriage Houses: Transforming a detached garage into a livable ADU, or adding a carriage house above an existing structure. As a garage conversion contractor, Greater Seattle Remodeling handles architectural plans, structural modifications, parking considerations, utility connections, and zoning compliance.
Each ADU type comes with its own cost range, timeline, and compliance requirements. Greater Seattle Remodeling helps clients compare these side by side before committing to a direction.
A complete ADU scope typically includes design and architectural plans, structural work, a separate entrance, insulation, windows, plumbing, electrical, HVAC, sewer tie-ins, and interior finishes. Site work, utility connections, and final inspections are also part of the process.
How the Process Works
Greater Seattle Remodeling uses a structured matching process to connect homeowners with qualified contractors suited to their specific project. After a homeowner shares their scope, timeline, and budget, the team verifies contractor licensing, insurance, and local track record before introducing two to three matched professionals.
Homeowners then receive structured, comparable proposals that lay out scope, materials, timelines, and warranties clearly. The team supports clients through the proposal review stage, helping flag gaps and clarify details before a contractor is selected.
Once a contractor is chosen, a site visit is scheduled, milestones are confirmed, and construction can begin. Greater Seattle Remodeling remains available through the contract and start of construction phases to help keep the project on track.
On the permitting side, ADU projects in Seattle require building permits and must meet local codes covering setbacks, height limits, parking, egress, and separate entrance requirements. The matched ADU builder manages permit applications, architectural plans, inspections, and final approvals.
Regarding timelines, internal ADUs tend to move faster, while detached ADU builds add time for site preparation, utility connections, and concrete work. Homeowners should plan for several months from design through final inspections.
For financing, many homeowners use renovation loans, HELOCs, or cash-out refinancing. Greater Seattle Remodeling's matched contractors can supply the plans and budgets that lenders typically require for underwriting purposes.
