Maximizing Profit With the Right SelfStorage Unit Mix 
Copyright 2014 by Virgo Publishing. 
http://www.insideselfstorage.com/ 
By: Kent Flake 
Posted on: 03/12/2009 

Most of us have been to a professional sporting event and sat in seats that, while comfortable, could have used a little more leg room. We’ve no doubt wondered why the designer of the stadium or arena couldn’t have given us just a couple more inches between the rows. While a couple of inches for one row of seats doesn’t seem like much, multiply it by dozens of rows and the impact on the total number of seats in the stadium or arena becomes significant. In short, the owners of the sporting franchise want to maximize the amount of rentable space (seats) while providing adequate, but not excessive, space for the customers. As owners and operators of selfstorage, our goal should be the same. In maximizing the amount of rentable space, the most overlooked factor is the unitmix layout. Since income is derived from renting storage space, it is fundamental to maximize rental areas and minimize common areas such as office space, lobby and access corridors. This is not much of an issue when developing a traditional driveup facility, but becomes increasingly important as the industry moves toward interior climatecontrolled units and multistory properties. You might think maximizing storage would be an easy proposition, but a surprising number of unit layouts do not incorporate some basic rules that maximize rentable space.
Does the customer’s perception of quality require a large rental office? Are your target customers so budgetconscious that a large office sends the wrong message? These are questions that affect how much of the total area will be used for the rental office/common area. Although this is an important consideration, it is not the factor that has the greatest effect on layout efficiency. Most selfstorage layouts are based on a 5foot grid system, and a 5footwide corridor is standard in the industry. While narrowing the corridor to maximize storage space may result in more rentable space, customers may not appreciate the more restrictive corridors. Instead, the focus should be in minimizing the linear feet of corridors on each floor plan. A unit mix with an average unit size of 120 square feet will be more efficient than a unit mix with an average unit size of 90 feet. Since every unit requires frontage on a corridor, a smaller mix with more units will naturally require more linear feet of corridor. Whether a space measures 10by10 or 10by30 feet, it has 10 feet of frontage on a corridor. A 5footwide corridor for a 30footdeep unit has a ratio of corridor width to unit depth of 5:30, or 0.167. Compare this to a 5footdeep unit on a 5foot corridor, which would have a ratio of 5:5, or 1.00. A 5footwide corridor with units on both sides effectively cuts these ratios in half; therefore, doubleloaded corridors should be used wherever possible. Remember, the higher the ratio of corridor width to unit depth, the less efficient the unitmix layout. The layout of two unit sizes in particular has a strong bearing on the efficiency of the unit mix―namely 5by10 units and 7.5by10 units. The tendency by many is to situate the unit with the 10foot dimension along the corridor. This contributes to an inefficient mix. A 5by10 unit with the 10foot dimension along the corridor has a corridor width to unit depth ratio of 5:5, or 1.00, compared to a ratio of 5:10, or 0.50, if the 5 foot dimension is placed along the corridor. This is illustrated in the diagram below.
The difference for the 7.5by10 units is not as profound, but when multiplied by 60 or 80 units, it has an impact. The rule that should be applied is the side with the narrower dimension should almost always be the side open to the corridor. The only exception would be when such a layout would result in support columns falling in the middle of a unit door. Some operators prefer a passthrough elevator design. While this is slightly more expensive, it allows a customer to push the cart through the elevators doors on the bottom floor and then, without changing directions, push the cart off the elevator through the opposite doors on the floors above. Most operators that have installed this type of elevator have received favorable comments from customers. Efficient unit layout requires “banks” of units be no narrower than 20 feet. This allows for backtoback rows of 10footdeep units. At times, the width of a building may challenge this requirement. In such cases, unit sizes can be shifted between floors to arrive at the most efficient overall mix. Also the depth of units against exterior walls can be varied to allow the interior banks to be no narrower than 20 feet. If the spacing still doesn’t work, one trick that may help is turning corridors in the opposite direction. Even though the majority of corridors in a particular development may run eastwest, there is nothing wrong with turning a section of the units 90 degrees so the corridors run northsouth. The primary consideration in doing this is so the number of turns from the elevator and the distance to the units does not become unreasonable. Not all architects are created equal, and leaving the unitmix design up to the architect may not maximize unit efficiency. Getting the right layout is like putting together a multilayered jigsaw puzzle. There are many pieces that can fit together in a variety of ways, but for maximum efficiency, each piece needs to be in the right place. Not everyone has the patience or the understanding of spatial relationships necessary to accomplish this task. However, by learning these few basic rules about layout efficiency, you can move closer to maximizing the earning potential of your selfstorage development. Remember the lesson from the ball park: Make the customer comfortable, but avoid the temptation to add a few extra inches between the rows. Related Articles: 