Our Mission
Bellingham ADU Builders exists to make ADU construction simple, transparent, and accessible for Whatcom County homeowners. We believe every homeowner should be able to understand what's possible on their property — without wading through municipal code, scheduling pre-application meetings, or guessing at costs.
Washington's HB 1337 and Bellingham's December 2025 ordinance update created the most favorable ADU environment in the state's history. We built our process to help homeowners take full advantage of these changes — from a free GIS-powered feasibility study through dedicated permitting to turn-key construction.
Meet Your Team
Carlos
Builder & General Contractor
Carlos runs Monarca Construction and serves as your single point of contact from design through final inspection. He coordinates architectural drawings, structural engineering, and the entire build process.
- Licensed WA State General Contractor
- Specializes in residential ADU construction
- Bellingham-based, Whatcom County focused
Loren
Permitting Specialist
Loren lives inside Whatcom County permit systems. He manages every submission, follows up with county staff, and keeps your project moving through the approval pipeline without delays.
- 50+ ADU permits processed in Whatcom County
- Deep relationships with planning departments
- Expert in BMC 20.10.036 and WCC 20.80.910
Jordan
Project Coordination
Jordan at Stambaugh Designs coordinates the digital infrastructure that powers our process — from the GIS feasibility pipeline to project tracking and client communication.
- Built the automated GIS feasibility system
- Manages project communication workflows
- Ensures nothing falls through the cracks
Sustainable Construction, Built In
Every ADU we build in Bellingham incorporates energy-efficient design — high-performance building envelopes, heat pump systems, and responsible materials sourced from Pacific Northwest suppliers. We don't treat sustainability as an upgrade. It's our standard.
Our sustainable building practices reduce operating costs by 50–60% compared to conventional construction, and our builds are designed to qualify for the 30% federal energy-efficient home tax credit — potentially saving homeowners $60,000–$135,000 on their ADU project.
Learn about our sustainable building approachWhy Local Matters
We Know the Code
Bellingham's ADU ordinance (BMC 20.10.036) and Whatcom County's regulations (WCC 20.80.910) have nuances that out-of-area builders miss. We work with these codes daily.
We Know the People
Loren has working relationships with planning department staff in Bellingham, Whatcom County, and Ferndale. This means faster responses and fewer surprises during review.
We Know the Land
From Birchwood's deep lots to Silver Beach's watershed restrictions, from Sunnyland's tight setbacks to Cordata's transit corridors — we understand the neighborhood-level details that determine feasibility.
We Know the Market
ADU rental rates, property value impacts, and ROI calculations specific to Bellingham and Whatcom County. We give you real local data, not national averages.
