What Size Storage Unit Do You Need? A Practical NYC Guide

What size storage unit do you need? For most New Yorkers the answer lands between 250 and 800 cubic feet: roughly 250 to 350 for a studio, 350 to 500 for a one-bedroom, 500 to 800 for a two-bedroom, and 800 or more for a three-bedroom. Those are starting points, not answers. The reliable way to pick a storage unit size is to measure what you are actually storing.

The problem with sizing by apartment label is that two identical one-bedrooms can differ by half a room of stuff, depending on whether the tenant owns a sofa or a futon, a full dining set or a folding table. This guide gives you a quick estimate by home size, then a method that takes ten minutes and gets you much closer, using box dimensions you can check yourself.

Quick answer by apartment size

Use this table to get in the right neighbourhood, then adjust with the method below. These figures are working estimates built from typical box counts and common furniture dimensions, not survey data, so treat them as a first pass rather than a final number.

If your household sits between two rows, or you own an unusual amount of one thing, skip the table and do the arithmetic. It is faster than being wrong.

Why NYC storage is sold in cubic feet, not 10 by 10

Full-service storage in New York is typically priced by volume rather than by floor plan, which is why you will be quoted in cubic feet instead of the square-foot dimensions used by drive-up self-storage in the suburbs. Our own rooms run from 32 cubic feet at the smallest to 1,600 at the largest, across eleven room sizes, starting at $29 a month.

Volume pricing is better for you, and it is worth understanding why. A square-foot number tells you nothing about ceiling height, and height is where a lot of usable space lives. A room quoted at 200 cubic feet is a defined amount of space regardless of its shape, so you are comparing like with like rather than guessing how high you are allowed to stack.

It also changes how you should think about the estimate. You are not trying to picture your furniture arranged on a floor. You are adding up how much space your things displace, which is a calculation rather than an act of imagination, and which is exactly what the next section walks through.

Size your unit from your boxes, not your apartment

Count your boxes by type, multiply by the volume of each type, then add your furniture. The box half is precise because carton sizes are standard. Below are the cubic-foot volumes calculated from the dimensions on our own moving supplies page, so you can verify the arithmetic yourself.

A worked example. A one-bedroom with 10 book boxes, 14 linen boxes, 3 china boxes, 2 wardrobe boxes and a TV box comes to about 103 cubic feet of cartons. That is the easy part, and it is usually a third of the total.

What actually eats the space: furniture

Furniture is where the number moves. A single three-seat sofa displaces more than thirty book boxes, which is why two homes with identical box counts can need different rooms. Estimate each large piece as length times width times height in inches, divided by 1,728.

Rough figures for common pieces, calculated from typical dimensions: a three-seat sofa around 60 cubic feet, a queen mattress and box spring around 65 with the frame, a six-drawer dresser around 24, a dining table around 45, a tall bookshelf around 18, a full-size refrigerator around 47. Measure yours if a piece looks unusually large, because a sectional or an armoire can move the total by a full room size on its own.

Then add roughly 15 to 20 percent to the total. Boxes and furniture do not tessellate; there are gaps between a sofa arm and a stack of cartons, and you need an aisle if you ever want to reach the back. Skipping that margin is the single most common reason people book a room that turns out to be too small on the day.

When to size up, and when not to

Size up when the contents will grow or when you need access; hold your size when the load is fixed and going in once. The deciding factor is not caution, it is whether the room has a job beyond holding a static pile.

• ☐ Size up if you will add to the room during the stay, for example seasonal items or business inventory
• ☐ Size up if you need to walk in and retrieve specific things rather than the whole load
• ☐ Size up if you are storing anything you cannot stack, such as a piano, a glass table top, or upholstered pieces you would rather not put weight on
• ☐ Hold your size if the load is packed, fixed, and going in once to come out once
• ☐ Hold your size if a full-service option means you never enter the room yourself

The access question is the one people answer wrong. It is tempting to assume you will not need anything, then discover in month two that the winter coats and the tax file are both in there. If there is any chance of retrieval, the aisle is not wasted space, it is the difference between a five-minute visit and unpacking half the room.

Climate control and what it changes

Climate control does not change the storage unit size you need, but it changes which items belong in the room at all. Anything that reacts to temperature and humidity swings, including wood furniture, instruments, artwork, wine, electronics and photographs, is a candidate.

The conservation numbers make the case better than any sales pitch. The National Park Service Museum Handbook puts the ideal relative humidity for wooden objects at 50 percent plus or minus 5, and is specific about what happens outside it: below 30 percent the glue can desiccate, joints loosen and finishes turn brittle, while above 70 percent you get mold and insects, weakened glue and corroding hardware. Most striking is the movement figure. A swing from 30 to 70 percent humidity can expand wood by as much as 2 percent across the grain, enough for a 2-foot panel to grow almost half an inch, which is how you end up with splitting, veneer loss and failed joints.

For reference on what a genuinely controlled environment looks like, the Smithsonian Museum Conservation Institute notes that Smithsonian museums hold their collections at 45 percent relative humidity plus or minus 8, and 70 degrees Fahrenheit plus or minus 4. That is the standard the phrase is borrowed from.

Worth knowing that the term is used loosely across the industry. Our specialty rooms hold a tight range that does not fluctuate more than one degree, which is a different proposition from a space that is merely indoors and heated in winter. A New York year swings across exactly the humidity band the conservation guidance warns about, so if you are storing anything where that distinction matters, ask for the actual tolerance rather than the label.

If your storage is part of a move rather than a separate rental, our combined moving and storage service handles both halves on one job, and the cost side across the city is broken down in our guide to how much storage costs in NYC.

Frequently asked questions

What size storage unit do I need for a one-bedroom apartment?

Plan on roughly 350 to 500 cubic feet for a typical New York one-bedroom, covering around 25 to 30 boxes plus a sofa, a bed set, a dresser and a dining table. Adjust upward if you own a sectional, a large wardrobe or an unusual amount of one category, since a single oversized piece can shift the total by a room size.

How do I calculate cubic feet for storage?

Multiply length by width by height in inches, then divide by 1,728. A book box at 17 by 13 by 13 inches works out to about 1.7 cubic feet. Do this for each furniture piece, count your boxes by type and multiply, add the two totals, then add 15 to 20 percent for the gaps between items and an access aisle.

Is it better to get a bigger storage unit than I need?

Only when the room has to do more than hold a fixed load. Pay for the extra space if you will add items during the stay or need to reach specific things without unpacking everything. If the load is packed, going in once and coming out once, the accurate size is the economical choice and the margin you already added covers the gaps.

Do I need climate-controlled storage in NYC?

It depends on the contents, not the size. Wood furniture, instruments, artwork, wine, electronics and photographs all react badly to temperature and humidity swings across a New York year. Ask any facility for the actual temperature tolerance rather than accepting the phrase itself, because the term covers everything from a tightly held range to a room that is simply indoors.

How many boxes fit in a 100 cubic foot storage room?

Around 35 to 40 medium boxes, if the room holds only boxes and they are stacked efficiently. Using linen boxes at 2.7 cubic feet each, 100 cubic feet is about 37 cartons before you allow for gaps. Add any furniture and that count drops quickly, which is why furniture should go into the calculation first.

The bottom line

Start with the table to get the right order of magnitude, then spend ten minutes counting boxes and measuring your three or four largest pieces. Add 15 to 20 percent for gaps and access. That number, not your apartment label, is what you should be shopping with, and it is the number that stops you standing in a room on move day discovering it is one size too small.

If you would rather not do the arithmetic, a free in-home or virtual estimate puts a trained pair of eyes on the actual inventory and returns a volume figure and a price together.