• The main French DIY stores are Leroy Merlin, Bricorama, Gédimat, Brico Dépôt, Weldom, Mr Bricolage, Bricoman, Castorama, BigMat, Point P and Bricomarché.
• Ressourcerie.fr lists a network of recycling centres where you can pick up certain used materials, such as windows and tiles, etc.
• Leboncoin.fr is an online secondhand shop used by individuals and professionals to buy and sell all sorts of products, including used building and home materials. You can search by location and product category.
• Emmaüs (predominantly furniture) is a network of charity shops set up by Abbé Pierre essentially to provide more affordable products for poorer communities, but which is open for all. Could be worth a look for furniture and fittings.