Modify the Colonial roof into a Dutch Colonial gambrel-roof with side gables. Extend roof eaves so that they have a large overhang. Install a stone chimney on one or both ends of the home.
Add flaring eaves over second-floor windows. Install double-hung sash windows. Ensure that all casements and window framing is done in wood.
Create a linear interior floor plan. Use the original concept of a single-room Dutch Colonial to center your entrance doorway into the main room of your main floor. Add rooms symmetrically on either side, as the original Dutch style always added additions to the ends of the home. Use stone to create the end walls on either side of the home, where the stone chimney base will be located.
Replace your front door with a centrally located entrance. Install a Dutch double doorway. Look for a door that divides horizontally in the original historic style.