When remodeling areas of the house, there's often an odd sink or shower door left over, still perfectly usable, just no longer suited to its former location. Rather than discarding these functional materials, donating them to an agency or nonprofit organization gives them a potential for new life, providing a sense of purpose to re-purposing.
Local Community Organizations
Many regions have not-for-profit warehouses and stores that sell used building supplies, benefiting a community organization. Some of these have limited hours or require that you bring your donations in. Others may offer a pick-up service if funding permits. Inquire ahead of time to make sure they accept both sinks and shower doors; they may have limitations on what goods they'll take.
Habitat for Humanity
Habitat for Humanity, a large nonprofit organization, runs shops called ReStore, selling both new and used building materials. As with smaller, regional nonprofits, calling ahead will verify whether they will accept the type of sink and shower door you have to offer.
Sometimes, people try to donate damaged, unusable goods to salvage shops and nonprofits. If the sink or shower door is damaged beyond repairability, it is most likely not going to be accepted as a donation. Include appropriate add-ons such as mounting hardware or sliding door track material for a shower door to make your donation more useful to potential recipients.
Disaster Relief Efforts
During times after disasters, such as tornadoes, hurricanes or severe flooding, many homes suffer extreme damage, requiring complete remodels. Sometimes time-sensitive localized relief agencies accept donated building materials, making the projects less stressful on homeowners suffering material loss. Visit local news websites during such times to learn of an appropriate organization that accepts material donations.