Cambridge Moves to Cap Airbnb Rentals at 90 Days a Year

Cambridge short-term rental hosts are one City Council vote away from a hard annual ceiling on their listings. The Planning Board voted unanimously on August 4, 2026 to send a positive recommendation to the City Council for a zoning amendment that would limit operators to 90 days per year of short-term rental activity. Even board members who supported moving the proposal forward raised concerns about that cap, signaling the fight is not over.

What the Proposed Ordinance Would Actually Do

The amendment is not a wholesale rewrite of Cambridge's existing rules. It targets what city officials describe as abuse of current regulations by some Airbnb-style property owners. The key changes are three-fold: updated operations and registration requirements, a new rental category called an "autonomous unit," and the new 90-day annual cap on how long any unit can be rented out in a calendar year.

The new wording draws a clear line between two types of rentals. An "autonomous" rental is one where an owner rents out their entire residence. An owner-occupied rental covers only individual bedrooms within a home the operator lives in. Under the proposal, only autonomous units, owner-occupied units, and adjacent units would be subject to the cap and the updated rules. An adjacent unit is defined as a property in the same building or on the same block as the owner.

The Board Said Yes, But With an Asterisk

A unanimous vote sounds decisive, but the Planning Board made clear it has reservations. Members flagged the 90-day cap specifically, and the board noted other minor changes it wants the City Council to consider before passing the ordinance. In short, the board advanced the proposal while asking the Council to take another look at its most consequential provision. City officials noted the 90-day figure was intended as a placeholder for further discussion, not a settled number.

Rental operators who showed up to Tuesday's meeting shared those concerns. The 90-day limit drew pushback from hosts who argued it would cut deeply into income from listings that are otherwise fully compliant with Cambridge's already strict primary-residence requirement.

What the Rules Already Require Today

Even before this amendment, Cambridge's short-term rental framework is among the more restrictive in Massachusetts. Under the current ordinance, Section 4.60 of the Cambridge Zoning Ordinance, a short-term rental is defined as any rental of a dwelling unit or bedroom for fewer than 30 consecutive days. Operators must be owners or authorized tenants who live in the unit as their primary residence.

Registration with the city is required, and so is payment of the state excise tax. Airbnb collects lodging tax on behalf of hosts on its platform, but registration and compliance remain the operator's responsibility. The state tax rate is 5.7%. Fines for violations can reach $300. Insurance is also required, and permits are not transferable if a property changes hands.

What Hosts Should Do Right Now

The ordinance is not law yet. It now goes to the City Council, where the 90-day cap and other provisions will be debated further. But hosts should not treat that as a reason to wait.

• If you are not yet registered, get registered. The city is currently accepting applications, and operating without a registration puts you at risk of fines and delisting regardless of what the Council ultimately decides.
• Track your rental days now. If a 90-day annual cap does pass, hosts who have no record of their current usage will have no way to demonstrate compliance or plan around the limit.
• Watch the City Council calendar. The Planning Board's recommendation moves the proposal forward, but the Council can amend it. The 90-day figure is not final.
• Review your insurance. Coverage is already required under existing rules, and any new ordinance is unlikely to loosen that requirement.

The Bottom Line

Cambridge has always been a difficult market for short-term rental operators. Primary-residence requirements, registration mandates, and tax obligations already filter out casual investors. A 90-day annual cap would add a new constraint that hits even fully compliant hosts in the wallet. The Planning Board's unanimous recommendation means this proposal has real momentum. Hosts who ignore it until the Council votes do so at their own risk.

For the complete Cambridge compliance guide including tax calculator, checklist, and daily monitoring, see Cambridge, MA STR Regulations.