A marine habitat enhancement system is provided that in one embodiment is configured for attachment to existing pilings and in another embodiment is a stand-alone system anchored to the soil. The system includes a housing formed of a plurality of panels configured for attachment together to surround either a piling or a marine habitat. Compartments on the exterior of the housing can be used to promote the growth of plants and other marine aquaculture. A cap is provided for use with stand-alone pilings to prevent contaminated water and material from escaping outside the sleeve formed by the plurality of panels.