Residential Sublease Agreement - Colorado
Residential Sublease Agreement — Colorado
Before you use this: Attach the master lease and obtain any required primary-landlord consent before possession. Colorado's just-cause rules may limit termination or eviction even after a stated sublease end date. Complete the radon disclosure and attach the current state radon brochure before signing.
This Sublease Agreement is made on [__/__/____] between [PRIMARY TENANT NAME] (“Sublessor”) and [SUBTENANT NAME] (“Subtenant”). The primary landlord is [LANDLORD NAME]. The parties agree as follows.
Premises, master lease, and authority
Address: [STREET, UNIT, CITY, COLORADO, ZIP].
Space sublet: ☐ Entire dwelling ☐ Only [ROOM OR AREA], with shared use of [COMMON AREAS].
Master lease dated: [__/__/____]. Master lease ends: [__/__/____]. A complete copy and amendments are attached as Exhibit A.
Sublease authorization: ☐ Written landlord consent is attached or signed below. ☐ The master lease permits this sublease without further consent; identify clause: [________]. Subtenant will not take possession until authorization is documented.
This sublease is subordinate to the master lease. Subtenant will follow its applicable, lawful provisions about use, occupants, guests, pets, noise, utilities, access, and care. The master lease remains between Sublessor and the primary landlord. This agreement does not release Sublessor from it or give Subtenant a longer right to occupy than Sublessor has. Sublessor will provide Subtenant the attached master lease before signing.
Term, rent, and utilities
Occupancy begins: [__/__/____]. Stated fixed-term end: [__/__/____], no later than the master lease end. Any renewal requires a signed agreement and any required primary-landlord authorization. The stated date does not permit a termination, demand for possession, or eviction contrary to Colorado's just-cause law.
Rent: $[________] per month, due on the [____] day to [PAYEE AND PAYMENT METHOD]. First payment: $[________] due [__/__/____]. Any partial month costs $[________] for [DATE RANGE].
Utilities and services: [SPECIFY EACH PAYER, AMOUNT OR SPLIT, AND DUE DATE].
Security deposit and condition
Security deposit: $[________], received on [__/__/____], no more than two monthly rent payments. Sublessor will keep a signed move-in condition record as Exhibit B. A requested move-out walk-through will be arranged if reasonable and practicable under Colorado law.
Sublessor will return the deposit within 30 days after termination or surrender, whichever occurs last, with a written statement of exact reasons for any lawful deduction and any documentation required by current law. Sublessor may not charge for normal wear or preexisting damage. Deductions may cover unpaid rent, utilities, lawful charges listed here, and necessary repair for damage beyond normal wear that did not preexist this sublease, as allowed by law. Subtenant's forwarding mailing address and agreed secure electronic refund method, if any: [________________________________].
Use, repairs, and lawful occupancy
Approved occupants: [NAMES]. Guests: [MASTER LEASE RULE OR AGREED LIMIT]. Pets: [MASTER LEASE RULE OR AGREED TERMS]. Subtenant will use the dwelling responsibly, avoid damage and disturbances, and promptly tell Sublessor of unsafe conditions or repair needs. Sublessor will pass those reports to the primary landlord and perform the duties Colorado law places on a sublessor. The warranty of habitability and other nonwaivable rights remain in force.
Ending occupancy and notices
Subtenant may leave when the fixed term ends; Colorado law does not require Subtenant to give a § 13-40-107 notice for a fixed term ending on a date certain. An earlier departure or later periodic tenancy is governed by this agreement and applicable law. For a periodic tenancy of one month to less than six months, a tenant's written notice must be served at least 21 days before the period end; longer or shorter tenancies use the duration-based period in § 13-40-107. The notice must describe the property, specify the termination date, and be signed. Sublessor may terminate or seek possession only on a legally available ground and with the notice and process required for the particular facts, including C.R.S. § 38-12-1302 and C.R.S. § 38-12-1303 where applicable.
Notices to Sublessor: [NAME, MAILING ADDRESS, EMAIL IF AGREED].
Notices to Subtenant: [NAME, MAILING ADDRESS, EMAIL IF AGREED].
Primary landlord or manager contact: [NAME AND ADDRESS].
Colorado radon disclosure and acknowledgment
WARNING: The Colorado Department of Public Health and Environment strongly recommends that ALL tenants have an indoor radon test performed before leasing residential real property and recommends having the radon levels mitigated if elevated radon concentrations are found. Elevated radon concentrations can be reduced by a radon mitigation professional. Residential real property may present exposure to dangerous levels of indoor radon gas that may place the occupants at risk of developing radon-induced lung cancer. Radon, a Class A human carcinogen, is the leading cause of lung cancer in nonsmokers and the second leading cause of lung cancer overall. A landlord is required to provide the tenant with any known information on radon test results of the residential real property.
Known test status: ☐ No known test ☐ Tested on [__/__/____]; most current records/reports attached as Exhibit C.
Known concentrations and mitigation/remediation: [DESCRIBE OR STATE NONE KNOWN].
Installed mitigation system and documentation: [DESCRIBE OR STATE NONE KNOWN]; records attached ☐ Yes ☐ No.
Most recent Colorado Department of Public Health and Environment radon brochure: attached as Exhibit D ☐ Yes.
Subtenant acknowledges receipt of this written radon disclosure, the listed records, and the brochure before signing the sublease.
Subtenant radon acknowledgment signature: ______________________________ Date: [__/__/____]
Signatures and primary-landlord consent
The parties have read this agreement and attached exhibits. Colorado law governs. Amendments must be signed by both parties, with primary-landlord consent when the master lease requires it. Each party will keep a signed copy.
Sublessor signature: ______________________________ Date: [__/__/____]
Sublessor printed name: [________________________________]
Subtenant signature: ______________________________ Date: [__/__/____]
Subtenant printed name: [________________________________]
Primary landlord's consent, if required: I consent to the occupancy and term above. This consent alone does not release Sublessor from the master lease.
Landlord signature: ______________________________ Date: [__/__/____]
Landlord printed name and title: [________________________________]
Colorado law reference
C.R.S. §§ 38-12-102.5, 38-12-103, 38-12-502, 38-12-503, and 38-12-803 address security, sublessor status, habitability, and radon. C.R.S. § 38-12-1302 and C.R.S. § 38-12-1303 address just cause. Section 13-40-107 addresses termination notice by duration.
About this template
- Last updated
- September 27, 2026
- Citations checked
- September 27, 2026
- Jurisdiction
- Colorado
- Category
- Landlord & Tenant
Legal authority
- C.R.S. § 38-12-502(5)
- C.R.S. § 38-12-102.5(1)
- C.R.S. § 38-12-103(1), (1.5), (8)
- C.R.S. § 38-12-503(1)
- C.R.S. § 38-12-803(2)
- C.R.S. § 38-12-1302(1)
- C.R.S. § 38-12-1303(1)
- C.R.S. § 13-40-107(1)–(4)
Landlord-tenant paperwork governs who can stay in a property, on what terms, and what happens when something goes wrong. Leases, notices to quit, security deposit demands, and habitability complaints all have state and often city-specific requirements for timing, content, and service. Getting the paperwork right is what makes an eviction actually succeed or a security deposit actually come back, because judges regularly dismiss cases over small procedural mistakes.
Not legal advice
This template is provided for informational purposes. We recommend having an attorney review any legal document before signing, especially for high-value or complex matters.
Checked against the law it cites
A reviewer verified this template's legal citations against the official source on September 27, 2026.
C.R.S. § 38-12-502(5) (checked September 27, 2026): ""Landlord" means the owner, manager, lessor, sublessor, successor in interest, or agent of the owner of a residential premises."
C.R.S. § 38-12-102.5(1) (checked September 27, 2026): "Except as described in subsection (2) of this section, a landlord shall not require a tenant to submit a security deposit in an amount that exceeds the amount of two monthly rent payments under the rental agreement."
C.R.S. § 38-12-103(1)(a) (checked September 27, 2026): "A landlord shall, within thirty days after the termination of a lease or surrender of a premises, whichever occurs last, return to the tenant the full security deposit deposited with the landlord by the tenant, unless the lease agreement specifies a longer period of time, but not to exceed sixty days."
C.R.S. § 38-12-103(1)(a)–(b) (checked September 27, 2026): "A landlord shall not retain the security deposit to cover normal wear and tear or for any damage or defective condition that preexisted the tenancy."
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