Is Your Apartment Legal? The Massachusetts State Sanitary Code, Explained
105 CMR 410 sets the minimum a Massachusetts landlord must provide. Here's what counts as a violation, what's owner-responsibility vs. tenant-responsibility, and how to get it enforced.
Every Massachusetts rental has to meet 105 CMR 410, the State Sanitary Code — working heat, hot water, no pests, sound structure, and more. Here's a practical, plain-English walkthrough of what's actually required and how to get violations fixed.
BLUF: What the Sanitary Code Actually Requires
🌡️Heat and Hot Water — the Most-Enforced Rules
- •Heat: during the heating season, habitable rooms must be kept at a minimum temperature (68°F daytime / 64°F at night are the commonly cited benchmarks under 410.201). The landlord is responsible for the heating system unless the tenant has agreed in writing to supply their own heat, and even then the system itself must be able to meet the standard.
- •Hot water: must be available year-round, capable of reaching a minimum temperature at the tap (410.190).
- •Who pays: unless your lease clearly shifts responsibility to you in writing, the landlord pays for the heat and hot water infrastructure and, in most owner-occupied and utility-included situations, the fuel itself.
🧰Structural, Electrical, and Safety Requirements
| Area | Requirement | Code section |
|---|---|---|
Kitchen & bathroom | Working sink, cooking equipment, refrigeration; toilet, tub/shower, sink | 410.100, 410.110 |
Water & drainage | Adequate potable water and sanitary drainage | 410.130 |
Electricity | Adequate service and illumination in habitable rooms, halls, common areas | 410.300 |
Smoke & CO alarms | Properly installed, maintained detectors as required by law | 410.330 |
Structure | Sound foundations, walls, roofs; weathertight windows/doors | 410.500, 410.530 |
Pests | Owner must eliminate infestations (with exceptions for tenant-caused, single-unit situations) | 410.550 |
Lead paint | Compliance required for pre-1978 units where a child under 6 resides | 410.470 / M.G.L. c. 111 §197 |
⚖️Whose Job Is It — Owner or Occupant?
The Code splits responsibility: owners must provide and maintain everything required to meet the minimum standards — the systems, structure, and equipment. Occupants must keep the unit sanitary and give the owner reasonable access (at least 48 hours' notice, except emergencies) to make repairs or inspect for compliance. An owner can't remove optional equipment they installed except between tenancies, and neither side can shut off a required utility except for genuine, notified repair work or a board-of-health-approved emergency curtailment.
🔨How Violations Get Fixed
- •Step 1 — Written notice to the landlord. Describe the problem, date it, and keep a copy. This creates the paper trail every remedy below depends on.
- •Step 2 — Request an inspection. Your local board of health must inspect on request (410.600) and can issue a correction order with a compliance deadline (410.640).
- •Step 3 — If it's not fixed: you may have grounds to withhold rent (a defense under M.G.L. c. 239 §8A) or repair the issue yourself and deduct the cost (M.G.L. c. 111 §127L, up to 4 months' rent) — see our dedicated Repair and Deduct guide.
- •Step 4 — Severe cases: a board of health can condemn a unit as unfit for habitation (410.650), and courts can appoint a receiver to force repairs in extreme, ongoing cases.
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Full reference
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Sources
Landlord not responding?
Request a free health inspection — your board of health must inspect on request and can order repairs.
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