How Somerville Handles Outdoor Lighting: A Practical Guide
Somerville maintains 147 local ordinances across all categories, and 2 of those deal specifically with outdoor lighting. Here is a breakdown of what the city actually requires, what is prohibited, and where Somerville falls on the strict-to-permissive spectrum compared to other cities.
Light Trespass & Shielding
Somerville's Outdoor Lighting standards exist 'to minimize adverse impacts of lighting such as light trespass, obtrusive light spillover, and harmful glare,' per §10.6.2.c, and back that purpose with a fixture-shielding rule: in the Neighborhood and Urban Residential districts, §10.6.4.d requires outdoor luminaires to be full cutoff or fully shielded, emitting no light above the horizontal plane.
Key details: Stated purpose: Minimize light trespass, spillover, glare. NR/UR fixture rule: Full cutoff or fully shielded. Cutoff angle: No light above 90° from nadir. Entrance exception: Up to 2 partly shielded fixtures. Other districts: BUG rating limits, Table 10.6.2.
Installing an outdoor luminaire in the NR or UR district that is not full cutoff or fully shielded, outside the five listed exceptions, violates §10.6.4.d and is enforceable by the Building Official through a correction order or denial of an occupancy permit for new construction. In other districts, installing a fixture whose backlight, uplight, and glare rating exceeds the limits on Table 10.6.2 for its distance from the property line is likewise a zoning violation.
Billboard Lighting
Somerville's Zoning Ordinance bans billboards outright, so no billboard-lighting standard exists because no billboard may lawfully stand in the city. Section 10.8.3 lists the only eleven sign types permitted by right and prohibits every other type, expressly naming billboards, monument signs, and pylon signs as prohibited.
Key details: Billboards: Prohibited citywide (§10.8.3(a)(ii)). Permitted sign types: 11 listed types only. Fine: $300/day per offense (§1.1.7). Sign illumination shielding: Required for permitted signs (§10.8.9). Effective date: Nov. 26, 2024 (Ord. 2024-14).
The Building Official fines any zoning violation, including an illegally erected billboard, $300 for each offense under §1.1.7(a), with every uncorrected day counting as a separate offense. The city can also pursue a non-criminal disposition under state law per §1.1.7(b), and can order removal since a billboard is not on the list of sign types permitted by right.
This is not one of those rules that cities tend to ignore. Somerville actively enforces its billboard lighting requirements.
The Bottom Line
Somerville's outdoor lighting rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Somerville is broadly strict or permissive.
Keep in mind that Somerville can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.