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O'Sullivan Builders brings over 40 years of expertise in custom home builds, home additions, and high-end renovations, including kitchen remodeling, bathroom remodels, and basement finishing. We specialize in roofing, vinyl siding, garage conversions, and smart home automation, ensuring energy-efficient upgrades. Our expert team also provides architecture services, barn construction, and commercial renovations. With transparent billing and a client-focused approach, we deliver quality craftsmanship in South Haven, MI. Let us bring your vision to life with precision and integrity.