Cosine Contracting

Cosine Contracting LLC

Cosine Contracting LLC is a construction business established in 2025 and based in Woodinville, Washington. John Trenkamp is the owner/operator. Cosine Contracting is registered with Labor and Industries as a General Contractor and is bonded and insured. Cosine Contracting is committed to providing craftsmanship and exceptional value for homeowners and small business. I'd welcome the opportunity to collaborate on your next home improvement project. Contact me to schedule a free bid proposal.

- Typical Projects: - decks, fences, trellis, sheds, tree houses and covered roofs; - windows, siding, doors and trim; - floors, trim, drywall, texture and painting; - bathroom and kitchen remodels; - catios; - handyman

Contact:: John Trenkamp; Cosine Contracting LLC; PO BOX 2945; Woodinville, WA 98072; UBI #: 605-649-333; cosinecontracting@gmail.com; 425-659-4345