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Self storage glossary: 60+ terms operators use

By [AUTHOR NAME] · Reviewed by [REVIEWER NAME], [ROLE] · Review date [YYYY-MM-DD]

Self storage has its own vocabulary, and lenders, buyers and software vendors use it freely. This glossary defines the terms an independent operator meets most often. Definitions are short and practical. Where a term needs more depth, we link to the full guide. Some terms have local legal meanings, so check your state's statute for liens, fees and notices.

Jump to a letter

A · B · C · D · E · F · G · H · I · K · L · M · N · O · P · R · S · T · U · V · W · Y · Z

A

• Access control: The gate keypads, codes and software that decide who can enter the property and when. Most systems log every entry by tenant code.
• Access hours: The hours tenants can reach their units, which are often longer than office hours. Set them in the rental agreement.
• Administrative fee: A one-time charge at move-in to cover paperwork and setup. Some states limit fees, so check local law.
• Aisle: The interior corridor between rows of units in a climate-controlled or multi-story building. Aisle width affects how easily tenants move furniture.
• Auction: The public sale of a defaulted tenant's stored goods to satisfy a lien. Process rules come from state law; see running a storage auction.

B

• Boat and RV storage: Outdoor, covered or enclosed spaces sized for vehicles and trailers. Several states have separate rules for vehicle liens.
• Break-even occupancy: The occupancy at which rental income covers operating expenses and debt service. Lenders often ask for it.

C

• Cap rate: Net operating income divided by property value or price. Buyers use it to compare facilities.
• Certificate of occupancy: The local government document that allows a building to be used. You cannot open to tenants without it.
• Climate-controlled unit: A unit inside a building that holds temperature, and sometimes humidity, within a set range. It usually rents at a premium over drive-up space.
• Collections: The process of recovering past-due rent, from reminder notices through lien sale.
• Conversion: Turning an existing building, such as a retail box or warehouse, into self storage.
• Corridor unit: Another name for an interior unit reached from an aisle rather than from outside.

D

• Debt service coverage ratio (DSCR): NOI divided by annual loan payments. Lenders set a minimum ratio in the loan terms.
• Delinquency rate: Past-due rent, or past-due tenants, as a share of the total. Track it monthly.
• Delinquency: Rent that is past due. Operators track it by age, such as 30, 60 and 90 days.
• Drive-up unit: A ground-level unit with a roll-up door a tenant can park in front of. It is usually the most requested unit type.

E

• Economic occupancy: Rent actually collected divided by gross potential rent. See physical vs economic occupancy.
• Existing customer rate increase (ECRI): A scheduled rent increase for current tenants. It is a main revenue lever once a facility is full.

F

• Feasibility study: An analysis of local supply, demand and rents before you build or buy. It tells you whether the project can work.

G

• Gate code: The personal number a tenant enters at the keypad to open the gate. Codes are usually disabled when a tenant goes delinquent.
• Gross potential rent (GPR): What the facility would earn if every unit were rented at street rate. It is the denominator of economic occupancy.
• Gross rentable square feet: Total building area including aisles, offices and walls. It is larger than net rentable square feet.

H

• Hallway unit: See corridor unit.
• Holdover tenant: A tenant who stays past a fixed term without a new agreement. Most storage agreements are month to month, so this is rare.

I

• In-place rent: What current tenants actually pay. It often differs from today's street rate.
• Insurance certificate: Proof of a tenant's own policy, which some agreements require instead of a protection plan.

K

• Kiosk: A self-service terminal where customers rent units and pay without staff. Kiosks support unmanned or lightly staffed sites.

L

• Late fee: A charge added when rent is not paid by the due date. Many states cap late fees by statute.
• Lease-up: The period after opening while a new facility fills to stabilized occupancy. It often lasts several years.
• Length of stay: How long a tenant keeps a unit, from move-in to move-out. Longer stays lower turnover costs.
• Lien: The operator's legal claim on a tenant's stored goods for unpaid rent. It is created by state self-storage lien statutes.
• Lien notice: The written notice a state requires before you can sell goods. The required delivery method varies by state; see self storage lien laws by state.
• Locker: A very small unit, often stacked, for documents or small items.
• Lockout: Blocking a delinquent tenant's access, by overlocking the unit or disabling the gate code. State law and your agreement set when you may do it.

M

• Management software: The system that holds the rent roll, billing, gate integration and reports. It is the source of most of your operating numbers.
• Move-in rate: The rent a new tenant pays at the start, often below street rate because of specials.
• Move-in special: A discount offered to win new tenants, such as a free or reduced first month.
• Move-out: A tenant vacating and ending the rental. Move-outs minus move-ins is your net rentals.
• Multi-story facility: A building with units on more than one floor, served by elevators. It is common where land is expensive.

N

• Net operating income (NOI): Revenue minus operating expenses, before debt service and depreciation. It drives facility value.
• Net rentable square feet (NRSF): Square feet inside units that can be rented. It is the standard basis for occupancy and rent per foot.

O

• Occupancy cost: The total monthly cost of running a facility divided by occupied square feet. It shows what each rented foot must earn.
• Overlock: A second lock the operator places on a delinquent tenant's unit to block access.

P

• Physical occupancy: Rented space divided by total rentable space, by units or by square feet. Square foot occupancy is the more useful version.
• Portable storage: Containers delivered to a customer's site and later stored at a facility or moved.
• Prepay: Rent paid several months in advance, sometimes in exchange for a discount.
• Protection plan: An operator-offered program that covers a tenant's goods up to a limit. It is not the same as insurance.

R

• Rate integrity: Keeping street rates steady instead of cutting them to match competitors. It protects in-place rents across the facility.
• Rent per square foot: Rent divided by square feet, usually stated as an annual or monthly figure. Say which when you quote it.
• Rent roll: The list of every unit, tenant, rent and paid-through date. Buyers and lenders review it closely.
• Rental agreement: The contract between operator and tenant. It sets rent, fees, access, liens and liability limits.
• Revenue management: Adjusting street rates and increases based on occupancy, demand and competitor prices.
• Roll-up door: The coiling steel door used on most units.

S

• Same-store: A set of facilities owned and stabilized over the whole comparison period. REITs use it to compare years fairly.
• Security deposit: Money held at move-in against damage or unpaid rent. Many operators do not charge one; check state rules if you do.
• Stabilized occupancy: The steady occupancy a facility holds after lease-up. Lenders and buyers value facilities on stabilized numbers.
• Street rate: The current advertised price for a unit type to a new customer.

T

• Tenant insurance: A third-party insurance policy that covers a tenant's stored goods. It is regulated as insurance by the state.
• Tenant: The person or business that signs the rental agreement and rents a unit.
• Turnover: The volume of move-ins and move-outs over a period. High turnover raises leasing and cleaning costs.

U

• Unit mix: The combination of unit sizes and types at a facility. See self storage unit mix.
• Unmanned facility: A facility run without full-time on-site staff, using kiosks, online rentals and remote monitoring.

V

• Vacancy: Unrented space. Measure it in square feet as well as units.

W

• Walk-in: A prospect who arrives at the office without a prior reservation or call.
• Waterproofing: Measures that keep water out of units, such as grading, sealed slabs and roof maintenance.
• Web reservation: A unit held online before move-in. Track how many convert to rentals.
• Wine storage: Climate- and humidity-controlled space for wine collections. It is a niche product at some urban facilities.

Y

• Yield: Revenue per square foot of available space. It combines rate and occupancy in one number.

Z

• Zoning: Local rules that decide whether self storage is allowed on a parcel.

Frequently asked questions

Related guides

• Self storage lien laws by state
• Self storage industry statistics, explained
• Physical vs economic occupancy, explained

Sources