When considering if a given tent will fit a tight space, use the following dimensions. Add 8 feet to the length of the tent you are considering and 8 feet to the width. For example, a 20×40 tent will require a 28×48 footprint. This allows adequate space for the guy wires, which extend 4 feet out from the tent. If you are unsure or uncomfortable with the certain size tent fitting your preferred site, please contact us. We are happy to do a free site visit and help you with the measurements.