69 solar installers filed 284 solar permits on homes in the City of Cambridge from October 2023 to September 2026; 37 filed one in the last 12 months. The middle filed job value was $30,074. The most active in the last 12 months were The Boston Solar Company LLC (23 permits), Great Sky Solar (11) and Revision Energy (8); busy is not the same as careful. Side by side: permits filed, share finished and permits in the last 12 months for each firm. Pick what you value and the list re-orders.
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Top 5 by solar permits filed in the last 12 months. This is volume, not quality: a busy firm is not necessarily a careful one.
The 4 ZIP codes with the most solar permits on homes from October 2023 to September 2026. Each opens permits by trade and the most active firms there.
Before you move a slider, the list is in a default order built only from the permit record: how much of each firm’s record is this kind of job (weight 30), how often its permits reached completion (25), how many permits it filed in the last 12 months (15) and how quickly its permits closed (10). Each measure is ranked against the other 69 firms and pulled toward the middle when a record is short.
The order comes from the Cambridge permit file, not from reviews: 37 of 69 solar installers filed a permit in the last 12 months and 51% of their permits a year or more old were finished. Nobody pays to be listed or to move up, and there are no star ratings or reviews. The sliders and presets change the weights, and the order changes with them. How the records work in Cambridge.
We do not rate contractors. In this page’s default order, which uses only the permit record through Sep 2026, the top 3 are All Energy Solar (13 permits, 7 of 7 older permits finished), The Boston Solar Company LLC (52 permits, 64% finished) and Revision Energy (21 permits, 69% finished). By permits filed alone, the most active is The Boston Solar Company LLC with 52.
69 firms are on the list; the busiest filed 23 solar permits in the last 12 months and the middle firm filed 2 in the whole file. Line them up on the same public measures: permits filed, share of permits finished and usual filed job value. Pick what matters to you and the list re-orders, for example recent activity if you need someone soon. The order comes from the permit record only, and nobody pays to be listed or to move up.
69 firms filed at least one solar permit on homes in the City of Cambridge from October 2023 to September 2026; 37 of them filed one in the last 12 months.
We have not matched license records to Cambridge firms, so ask for the license number and check it yourself with Massachusetts license lookup. How to check a contractor's license in Massachusetts →
Three you can check against this page: “How many solar permits have you filed in Cambridge?” (the middle firm here filed 2; 37 of 69 filed one in the last 12 months); “What value will you put on the permit?” (the usual filed value here is $30,074); “Will you pull the permit in your company’s name, and when is the final inspection?” (51% of older solar permits here were finished). All 10 questions and how to check each →
On this page: 69 firms filed 284 solar permits from October 2023 to September 2026, and each firm’s name opens its own permit record. Every number comes from City of Cambridge Inspectional Services permits (the city's per-type open-data permit files). To see one permit itself, search the address or permit number with the Cambridge permit office. How the records work in Cambridge →
We do not rate or collect reviews. Instead each of the 69 solar installers here is shown with its permit record: 284 permits, the share finished and usual filed value. Read reviews on other sites and use this page to check them against the record. Reviews vs permit records →
Every number on this page comes from City of Cambridge Inspectional Services permits (the city's per-type open-data permit files): 69 firms filed 284 solar permits on homes in the City of Cambridge from October 2023 to September 2026, and 37 of them filed one in the last 12 months. The middle firm has 2 permits in the whole file. A short record leaves more uncertainty, and some jobs never require a permit.
The middle recorded permit value is $30,074. That is a filed estimate, not a quote or final bill. See how we compare records.
Most Cambridge solar permits are filed in October (169 against an average month of 100); March is the quietest (72). When each trade is busiest in Cambridge →