What?
Building materials are generally classified as construction and demolition (C&D) waste.
Where?
Skip hire companies generally provide a recycling service for some materials and a disposal service for others.
If small enough,, simple materials like clean plastic and metal may be suitable for your household recycling bin.
Some civic amenity sites also accept this material. Check the waste services locator on this site.
General Comment / Tip
Before disposing of building materials always consider reuse – do you have a DIY project that you might be able to use them for?