My "darkroom" cosists of a 3X6 foot counter top. It holds two enlargers and 8X10 trays for paper developing. Washing, etc is done downstairs at the kitchen sink. Film loading is done in a closet. Where there's a will, there's a way. I should mention that if you want to contact print your 4X5s, you could make up a kit that would fit in a small case. A box of Ilford Multi Grade postcard paper, 3 5X7 trays, 3 one liter chemical bottles, 15 watt safelight bulb, 15 watt light bulb, small print frame or sheet of plate glass. That, a sink, and any dark closet will put you in business.