Start with the type of job
Small domestic clearances, garden tidy-ups, and single-room jobs often point toward the smaller end of the range. Renovation work, heavier mixed waste, and whole-property clearances usually need more room than people first expect.
If the project is opening up walls, pulling out kitchens, or mixing bulky and heavy materials together, it is worth planning for the load to grow rather than just pricing the first pile you can see.