About Us

Residential and Commercial Construction Excellence since 1963

High Quality, Ethically Sourced Materials

Your Satisfaction is Guaranteed

Honest Prices

Over 55 years Of Experience

Our Story

We’ve Been Building and Renovating Spaces Since 1963

For more than 55 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 of 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 renovation to semi- and fully-custom capabilities. We build to suit our clients throughout 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 Construction. We wouldn’t want it any other way.


MHBR List Number 152


Equal Housing Opportunity Lender



Lions Club

Office Location

PO Box 250, Waldorf, MD 20604