A skip is usually the cheapest upfront option if you've got space on your property and can wait 3–5 days for delivery and collection. You fill it yourself, though, and you're responsible for what goes in — hazardous items like asbestos or freon-cooled fridges can't go in, and you'll face extra charges or refusal. Council waste collection in West Midlands doesn't cover business waste; you need a commercial contractor.
Professional office clearance costs more than a skip but includes labour, sorting, recycling co-ordination, and a waste transfer note (your legal proof of responsible disposal). You avoid the mess of loading, you're not liable if hazardous material is found later, and usable furniture can go to charity instead of landfill. For a typical office suite — desks, chairs, cabinets, printers — clearance is faster and cleaner than DIY skip hire.
