Providers love large contracts. Volume is obviously a very efficient tool to negotiate the best prices. Don’t stay alone with your tiny volume that won’t probably represent a sufficient volume to get a good deal.
For individuals, Groupon is typically a good example of volume negotiation. Groupon guarantees to bring a certain volume to the provider, in exchange the provider would concede huge discounts that can reach up to 80 or 90%.
For some specific expenses like security, cleaning or waste management don’t hesitate to contact the companies located in your building or in the neighbourhood. Providers will easily concede better conditions if they can guard or clean 5 buildings instead of one. This might be obvious but very few companies in Belgium join together to get better deals. You would be surprise the discounts that can be negotiate.