Cambridge's Short-Term Rentals: The Rules That Matter

Every city handles short-term rentals a little differently. In Cambridge, Massachusetts, there are 6 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Insurance Requirements

Massachusetts law requires STR operators to carry at least 1 million dollars in liability insurance covering each rental, either directly or through the hosting platform.

Key details: Minimum Coverage: 1 million dollars. Statute: MGL c.64G s.14. Platform Coverage: Acceptable if equivalent. Homeowner Policy: Usually excludes STR. Proof: Required at registration.

This is one of the stricter rules in Cambridge's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Occupancy Limits

Cambridge caps each short-term rental operator at one operator-occupied unit, with no more than three individual bedrooms rented out, plus at most one separate owner-adjacent unit citywide.

Key details: Operator-occupied cap: 1 dwelling unit per operator. Bedroom cap: 3 individual bedrooms per unit. Owner-adjacent cap: 1 additional unit per operator. Minimum stay: 10 consecutive hours. Bedroom ceiling: Capped at lawful bedroom count.

Offering more than one operator-occupied unit, more than three bedrooms within it, more than one owner-adjacent unit, or more bedrooms than the dwelling lawfully contains violates Section 4.64, items 5 and 10; Inspectional Services can deny or revoke the certificate of registration issued under Section 4.67 for a unit found out of compliance.

Short-Term Rental Permits

Every Cambridge short-term rental operator must register with Inspectional Services and obtain a certificate of registration before hosting, backed by a mandatory pre-issuance inspection and renewal every five years.

Key details: Registration required with: Inspectional Services Department. Pre-issuance step: Mandatory unit and bedroom inspection. Renewal cycle: Every 5 years, or on ownership change. Proof required: Primary residence documentation. Ordinance effective date: April 1, 2018.

Operating a short-term rental without a valid Inspectional Services certificate of registration violates Section 4.64, item 2, and is a zoning violation the Commissioner of Inspectional Services can enforce through denial, non-renewal, or revocation of registration under the standards set out in Section 4.67; the certificate itself binds the operator to abide by all Section 4.60 requirements.

Compared to other cities, Cambridge takes a harder line on short-term rental permits. The enforcement and penalty structure reflects that.

Host Presence Rule

Cambridge lets residents run operator-occupied short-term rentals only while the operator actually lives there. If the host leaves the unit for more than seven straight days, the rental can no longer be split among separate short-term renters by bedroom.

Key details: Trigger: Operator away more than 7 consecutive days. Effect: Whole-unit rental only, one party at a time. Applies to: Operator-occupied short-term rentals. Enforcing agency: Inspectional Services Department. Related cap: Up to 3 bedrooms when host present.

Renting bedrooms separately to different parties while the operator is away more than seven consecutive days breaches Section 4.64, item 9. Because the requirement is tied to the operator's certificate of registration under Section 4.67, the Inspectional Services Department can treat a violation as grounds to deny renewal or revoke the certificate; renting without a valid certificate is a separate zoning violation under Section 4.64, item 2.

Taxes & Fees

Cambridge short-term rental operators must remit all city and state taxes and fees on their rental income, on top of the registration fees charged for the Inspectional Services certificate itself.

Key details: Tax/fee remittance duty: Section 4.64, item 6. Registration fee duty: Section 4.67, item 1. Payable to: City and/or State authorities. Certificate renewal: Every 5 years. Proof posted in unit: Certificate of registration.

Failing to remit required city and state taxes and fees under Section 4.64, item 6, or failing to pay registration fees under Section 4.67, item 1, breaches the conditions of the certificate of registration and can support denial, non-renewal, or revocation by the Inspectional Services Department.

Primary-Residence-Only Rule

Cambridge only permits operator-occupied short-term rentals in a unit that is the operator's actual primary residence, and operators must prove that status with a tax-exemption enrollment or a sworn affidavit.

Key details: Core requirement: Unit must be operator's primary residence. Proof option 1: Cambridge residential tax exemption enrollment. Proof option 2: Sworn affidavit plus ID and utility record. Verifying record window: Utility/government document within 3 months. Applies to: Operator-occupied and owner-adjacent STRs.

Registering or operating a short-term rental in a unit that is not the operator's verified primary residence, or submitting false affidavit documentation under Section 4.67, item 1, exposes the operator to certificate denial or revocation by Inspectional Services and to the perjury exposure the affidavit is signed under.

Compared to other cities, Cambridge takes a harder line on primary-residence-only rule. The enforcement and penalty structure reflects that.

The Bottom Line

Cambridge is tougher than many cities when it comes to short-term rentals. Out of the 6 rules covered here, 3 are rated strict. If you are a homeowner, renter, or business owner in Cambridge, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

This guide is based on Cambridge's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.