About US

Mystery Bay Construction & Landscaping is a full-service general contracting firm specializing in high-quality residential remodels, custom ADU construction, and complex site work. Based on Marrowstone Island, owner Aaron James leads a highly skilled crew of three, dedicated to delivering precision craftsmanship and reliable project management across the Quimper Peninsula. With over 75 years of combined experience in the construction industry, our team takes pride in being a trusted resource for our clients.

​We specialize in transforming properties through thoughtful expansion—whether that’s a new detached ADU, a sunroom addition, or a new deck. From the initial excavation, site prep, and permitting to the final tile work and landscaping, we handle every phase of the project with an eye for detail and a commitment to durability. Our team brings the expertise and heavy equipment necessary to manage everything from interior renovations to large-scale exterior transformations.

Whether you need an agricultural fence to NRCS specifications, a beautiful cedar backyard fence, or a custom deer-proof garden fence that blends function and curb appeal, we offer a customized fencing solution for your needs. We also design patios, paths, rain gardens, and raised beds to add beauty and functionality to your personal paradise. For larger landscaping redesigns, we offer drainage, excavation, and site preparation. We take a permaculture approach to our work, ensuring that our projects work within your microclimate, build soil, attract pollinators, and conserve water.

We strive to exceed clients' expectations with every project we take on. Let Us Build Your Dream!