Renting Out a Spare Room in Colorado: A Step Guide

Renting out a spare room in a Front Range home means treating it like any other rental: a written lease, a legal security deposit, a screened tenant and a room that is clean and move-in ready. Colorado's landlord-tenant rules apply even when the landlord lives down the hall.

Is renting out a spare room in Colorado legal?

Yes, homeowners across the Front Range rent spare rooms and accessory units regularly. Check two things first: your HOA or condo declaration, since some restrict renting a portion of a home or require registration, and your city's short-term rental license rules if you plan to rent by the night instead of by the month. Denver, Aurora, Colorado Springs and Boulder each license short-term rentals differently, so confirm the local rule before you list.

Assess the room before you list it

Walk the room the way a tenant will see it. Check for a working light fixture, a door that locks, enough outlets, and a closet or storage space. Fresh paint and a deep clean go further than any other single change. Decide whether the room will be furnished; if it is, budget for a bed, dresser and desk, since a furnished room rents faster than an empty one.

Set clear boundaries for shared spaces before you advertise: which bathroom the tenant uses, whether the kitchen and living room are shared, and any quiet hours. Writing these down now prevents disputes later, and it gives you a ready answer the first time a prospective tenant asks how the household actually works day to day.

What repairs should I make before a tenant moves in?

Check every plumbing fixture the tenant will use. Test sinks, showers and toilets for slow drains, and clear minor clogs before move-in with a natural drain cleaning recipe rather than waiting for a backup during the first week. Confirm the furnace, smoke detectors and carbon monoxide detectors all work; Colorado law requires working smoke and carbon monoxide detectors in every rental.

How much can I charge for a spare room in the Denver metro?

Room rents on the Front Range vary widely by neighborhood, but a private room in a shared house in the Denver metro commonly rents for $700 to $1,200 a month, with higher rents near downtown Denver, Boulder and light rail stations. Check current listings on rental platforms and adjust for whether the room includes a private bathroom, parking or utilities.

What is the security deposit cap in Colorado?

Colorado law caps a residential security deposit at two months' rent under SB23-184. A separate 2025 law, HB25-1249, changed how landlords must document and return deposit deductions, not the deposit cap itself. Put the deposit amount, and the timeline for returning it after move-out, in writing in the lease.

What can I ask on a rental application?

You can ask for income verification, rental history, references from a prior landlord or roommate, and consent for a credit and background check. Colorado's tenant screening law, HB23-1099, requires landlords to disclose their screening criteria in writing before charging an application fee and to give notice of the reason for a denial. Keep your criteria consistent for every applicant. A full walkthrough of what documents to request is in documents needed for a rental application, and how to avoid rental application fraud covers red flags to watch for.

Do I need a written lease for a room rental?

Yes. A lease or room-rental agreement should include the rent amount and due date, the deposit amount, which utilities are included, house rules, and the length of the term. A month-to-month agreement gives both sides flexibility; a fixed-term lease gives more stability. Either way, put it in writing and have both people sign it.

What does Colorado's warranty of habitability require?

Colorado's warranty of habitability requires a rental to have working heat, plumbing, electrical systems and weatherproofing, among other baseline conditions. That standard applies to a rented room the same as a full unit. Keep the furnace serviced and address leaks or pest issues promptly, both to stay compliant and to protect the rest of the home.

How do I find and screen a roommate?

List the room on a platform built for roommate matching, such as SpareRoom, which lets you filter for budget, move-in date and lifestyle preferences and connects homeowners with renters in cities across the country. Run a credit and background check through a reputable screening service, call at least one prior landlord or roommate reference, and hold a short interview about schedule, work and expectations before you sign anything.

How do utilities and shared costs get split?

Decide upfront whether utilities are included in the rent or split separately, and put the arrangement in the lease. A flat add-on for utilities is simpler to administer than dividing every bill; either way, state the dollar amount or the method clearly so there is no dispute at the end of the month.

Does renting a room count as taxable income?

Yes, rent from a spare room is reportable income. Owners can deduct a proportional share of expenses such as utilities, repairs and depreciation for the rented portion of the home, based on square footage or number of rooms. Keep receipts and a simple log of the space rented versus the whole home, and talk to a tax professional about your specific situation before filing.

What if the roommate stops paying rent?

Send a written notice citing the missed payment and the lease terms, and follow Colorado's notice requirements before pursuing eviction through the courts; do not change the locks or remove belongings yourself, since Colorado law prohibits self-help eviction. A documented lease and deposit make this process far more straightforward than an informal, undocumented arrangement.

Do I need landlord or renters insurance to rent out a room?

Tell your homeowners insurance carrier that you are renting out a room before you sign a lease. A standard homeowners policy is written for owner-occupants and gaps can appear once part of the home is rented for income; many carriers add an endorsement or ask you to add landlord liability coverage instead. Ask the tenant to carry a renters insurance policy of their own to cover their belongings, since your homeowners policy will not.

How much notice do I need to end a month-to-month room rental?

For a month-to-month tenancy, Colorado requires written notice of at least one full rental period, which is 21 days for most month-to-month arrangements; the exact notice period depends on how long the tenant has lived there and the terms in your lease. Put the notice period in the lease itself so both sides know the rule from day one instead of finding it out mid-dispute.

Where to go next

• Colorado rental property checklist
• Denver house hacking guide
• Colorado real estate investing guide
• Search homes for sale in Denver
• Search every home for sale in Colorado

Talk to the Kenna Real Estate Group

Whether you are renting out a spare room for extra income or thinking about buying a home built for a tenant, the Kenna Real Estate Group can walk you through what works on the Front Range. Call or text 303-955-4220. A live person answers. Not a robot, not a phone tree. Ready to look at homes with rental potential? Search every home for sale in Colorado.