Renting to CSU students: what makes a basement bedroom legal in Fort Collins after U+2

September 21, 2026

The three-unrelated-people rule is gone, so the number of bedrooms in a Fort Collins rental now sets what it can earn. That makes the basement bedroom question a money question for every landlord near campus. The short answer: a basement room is a legal bedroom when it has a code emergency escape and rescue opening, meets the city’s size and ceiling rules, and was permitted as a bedroom. An egress window alone does not do it. A full egress install runs $3,800 to $7,000, enlarging an existing opening $2,800 to $5,000, and a permitted basement bedroom conversion package $3,800 to $7,500.

Here is what changed, what the city actually checks, and what older houses near campus are up against.

What changed in 2024

Fort Collins had an occupancy rule known as U+2. Colorado State University’s Off-Campus Life office describes it as a limit of no more than three unrelated individuals living together in a residential dwelling unit. For decades that capped a four-bedroom house near campus at three student tenants regardless of how many rooms it had.

In 2024 the state passed HB24-1007, which prohibits counties, cities and municipalities from limiting how many people may live together in a single dwelling based on familial relationship. Fort Collins City Council followed with Ordinance No. 081, 2024, removing the familial-relationship occupancy limits from the Land Use Code, effective July 12, 2024.

What is left, per the same CSU page, are limits based on demonstrated health and safety standards such as building and fire codes, plus affordable-housing program rules. In other words, the cap is no longer “three people.” The cap is “how many legal bedrooms does this house have.” Every legal bedroom you add is a tenant you can legally house.

The demand is not hypothetical

CSU’s fall 2025 census report puts total enrollment at an all-time high of 34,412 students, with 26,839 undergraduates and 5,376 first-year students in Fort Collins. The city’s own drainage handout for residential permits lists “a residential structure is added to a large lot for student housing around the CSU campus” as a routine example of a large project. The city knows where the pressure is.

What the city checks before it calls a room a bedroom

Fort Collins Building Services publishes two documents that answer this directly.

The egress window guide says, in a boxed notice: the installation of an emergency escape and rescue window does not create a legal bedroom. A remodel permit, or a basement finish permit, is required to create or relocate a bedroom, and there are additional code requirements specific to bedrooms.

The residential basement finish guide (revised December 26, 2025) lists those requirements. The ones that decide whether a basement room qualifies:

A basement finish permit is a flat $155 in Fort Collins and runs as a fast-track permit. The foundation cut for the window is a separate permitted item with its own engineer’s letter. The permits and inspections page walks through both.

The city guide also has a line worth quoting for anyone who bought a house with a “bedroom” the previous owner built without a permit: work done without a permit is a violation, but if you purchased a property with unpermitted work, the city says it is happy to work with you to permit it and bring the space into compliance without fines. That is the path for a lot of older rentals near campus.

The rental side: registration and standards

Since January 1, 2025, most long-term rental properties in Fort Collins, meaning homes rented for 30 days or more, must register annually with the city. The base fee is $37 per year per property plus $10 for each additional unit on the same lot. No inspection is part of registration. Instead the owner self-certifies that the property meets the minimum standards of the International Property Maintenance Code.

The city’s landlord-tenant handbook spells out the standards that touch a basement bedroom. A required emergency escape and rescue opening must be maintained to the code in effect when the house was built, or provide at least 720 square inches of net clear opening, whichever is greater, with a sill no higher than 48 inches above the floor. Window wells within 3 feet of a driveway or sidewalk must have guardrails or grate covers. Smoke alarms go in each room used for sleeping and on each story including the basement.

Self-certifying that a basement room with a 1960s hopper window is a compliant bedroom is a signature you do not want to explain later.

Why older houses near campus are the hard cases

Fort Collins publishes a chart of what its egress rules were in each code era. It matters because a window built to the code of its day is still considered compliant, but it may not make the room a bedroom under a new basement finish permit, and it may not be what a tenant or an inspector expects.

• Built between November 1966 and November 1977: the rule was a 5 square foot opening with no dimension under 24 inches (then 22 inches after 1971) and a 48-inch maximum sill. No window well requirement at all.
• Built between December 1977 and May 1998: 5.7 square feet, 24 inches high, 20 inches wide, 44-inch sill. Still no well requirement.
• Built after May 19, 1998: the 36-inch well with a ladder is added.
• Since October 2010: a ladder is required when the well is deeper than 44 inches, and grade or basement openings may be 5 square feet.

A lot of Fort Collins rental stock predates the well rule entirely: the city’s Laurel School historic district alone recognizes housing from the 1870s through the 1930s, and the chart above covers everything built through the 1990s. In those houses the basement windows are typically small, high, and sitting in shallow dirt wells or no well. Turning that room into a legal bedroom is usually a full cut and well, not a window swap. The failed inspection page has the tape-measure check for the room you are looking at.

What the appraiser will and will not count

One more honest point. Fannie Mae’s Selling Guide requires appraisers to follow the ANSI Z765 standard and treats any level as below-grade if any portion of it is below grade, regardless of finish quality or window size. Below-grade rooms are not included in the above-grade room count. They are reported separately and adjusted on their own line, and the guide notes they can add substantially to value. So a legal basement bedroom is worth real money and real rent, but on a lender’s appraisal it is a finished below-grade room, not a fourth above-grade bedroom. Anyone who promises otherwise is guessing.

The plan for a landlord

1. Measure the existing basement window against the current numbers: 5.7 square feet net clear (5.0 at or below grade), 24 inches high, 20 inches wide, sill within 44 inches.
2. If it fails, price the egress window installation or, where the opening is close, the enlargement.
3. File the basement finish permit alongside the foundation cut so the room is permitted as a bedroom, not just a room with a window. The basement bedroom conversion page is that package.
4. Register the rental and self-certify honestly once the final inspection is signed.

Nobody can guarantee a permit or an inspection, and we do not. What we can do is build to the numbers the city publishes, handle the paperwork, and give you a flat quote before anyone cuts. The egress window calculator shows the range now.