About Us

For more than 53 years, our award-winning family-held firm has remained independent, allowing us to excel in quality workmanship and unsurpassed customer relations and service. Guadagnoli Companies consists Rainbow Construction Corporation of Waldorf, Rainbow Commercial Construction and Guadagnoli Properties. Working together as a team, our family and employees, along with our subcontractors, strive to provide our clients with a product built with pride and quality craftsmanship at affordable prices.

Our goal is to assure customer satisfaction by providing individualized attention to each project. We make the building process an enjoyable experience from pre-construction to long after moving in. Our qualifications range from community homes and commercial renovation to semi- and fully-custom capabilities whether residential or commercial. We build to suit our clients in Charles County, Waldorf, Southern Maryland and Washington, D.C. .

As recipients of the prestigious SMBIA Builder of the Year Award, Finest for Family Living Award, and the Parade of Homes Award of Merit, you can be assured that by building with us, your project will be built with the highest standards of quality, service, and style.

We know you’ll be proud to say you own a Rainbow home or have worked with Rainbow Commercial Construction. We wouldn’t want it any other way.


Certified Master Builder Logo
List Number #152
Equal Housing Opportunity Logo
Equal Housing Opportunity Lender
SMBIA award
Lions Club Logo
Lions Club
Charles County Chamber of Commerce NAHB Green Advantage EPA