Rent Per Square Foot: How to Compare Apartment Units and Comps
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A one bedroom rents for $1,300 and a three bedroom for $1,900. Which is the better rent? Per unit, the answer is obvious. Per square foot, the answer can flip. Rent per square foot is the way apartment investors compare unlike units and unlike buildings. This post shows how to calculate it, where it misleads and how to use it for comps and renovation plans. It is part of our guide to rent comps. General information, not investment advice.
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The calculation
Monthly rent per square foot is the monthly rent divided by square feet.
| Unit | Size | Monthly rent | Rent per square foot |
|---|---|---|---|
| Studio | 450 sq ft | $1,100 | $2.44 |
| One bedroom | 650 sq ft | $1,300 | $2.00 |
| Two bedroom | 900 sq ft | $1,600 | $1.78 |
| Three bedroom | 1,100 sq ft | $1,900 | $1.73 |
These are made up numbers for illustration. The pattern is typical: as units get bigger, rent per foot falls, even though rent per unit rises.
Why it is useful
- Comparing buildings. Two buildings with different mixes can still be compared on rent per foot.
- Sizing a renovation premium. If renovated units in a comp rent for about $0.25 more per foot, you can test whether your plan's premium is realistic. See rent premiums and renovation budgets.
- Checking efficiency. A building with large units and low rent per foot may have a different resident base than one with smaller, pricier units.
- Valuation context. Some buyers cross check value per foot of building area. See price per unit.
Where it misleads
- Unit size differences. A 450 square foot studio and a 1,100 square foot three bedroom should not be compared head to head.
- Measured vs stated sizes. Rent rolls, listings and county records may disagree. Pick one source.
- Gross vs net. Some sources count balconies or common walls differently.
- Concessions. Compare net effective rent per foot, not asking rent. See net effective rent and concessions.
- Condition and location. A renovated unit on a better floor is not the same product as a dated one.
How to run a clean comparison
- List the unit types in your building from the rent roll. See the rent roll and T12.
- For each type, find three to five comps with similar size, age and condition.
- Calculate rent per foot for each and note the range.
- Compare to your own in place rents. The gap is a clue, not a proof. See loss to lease.
- Check the answer against the unit mix. See unit mix analysis.
A hypothetical example
This is an illustration with made up numbers, not a market survey. A building's two bedrooms average 900 square feet and rent for $1,500 ($1.67 per foot). Three comparable renovated buildings show $1.85 to $2.00 per foot. If the sponsor's plan assumes the renovated units reach $1.85, they would rent for about $1,665 ($1.85 times 900). That is a $165 premium over $1,500. The sponsor then asks whether the renovation scope and the building's location can support it, and keeps a lower case in the model. See sensitivity analysis.
How DoorRaise fits in
DoorRaise does not set rents. A sponsor builds the underwriting, and DoorRaise handles the raise, the deal company, the investor paperwork and escrow. Sponsors pay a flat $1,500 setup fee and a flat $5,000 yearly administration fee.
Frequently asked questions
Is higher rent per foot always better?
No. Higher rent per foot often just means smaller units. Compare like sizes and look at total rent per unit too.
Which square footage should I use?
Use one consistent source for every unit and comp, and note it in your model.
Should I use rent per foot for valuation?
It is one cross check. Value is driven mainly by net operating income and the cap rate. See how to calculate a cap rate.
Sources
This article is general information as of November 2026, not legal, tax or investment advice. Every investment can lose money. DoorRaise is not a law firm, broker-dealer, investment adviser or funding portal.