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Home additions in Arlington, MA
An Arlington addition of 750 sq ft or half the floor area brings neighbor notice, and covering 25% of an inventoried wall counts as demolition.
Arlington rules that apply
What Arlington requires for home additions.
Demolition delay for inventoried buildings
If the Historical Commission finds a building on its inventory or the National Register preferably preserved, no demolition permit can issue until twelve months after the application. Removing or covering more than 25% of any front or side elevation counts as demolition.
Source: By-Laws of the Town of Arlington, through 2025 Annual Town Meeting (PDF)
Neighbor notice before big jobs
Before demolition, open foundation excavation, new residential construction or a large addition, the owner must mail notice to abutters and occupants within 200 feet. A large addition means 750 square feet or more, or 50% or more of the existing gross floor area.
Source: Town of Arlington Bylaws: Title VI, Building Regulations
Tree plan for demolition or footprint growth
Demolishing a structure, or building on a developed lot so the total footprint grows 50% or more, requires a Tree Plan filed with the Tree Warden before or with the building permit. Healthy private trees of 6 inches DBH or more in the setback area are protected, and removals are paid into the Tree Fund.
Source: By-Laws of the Town of Arlington, through 2025 Annual Town Meeting (PDF)
Fossil-fuel-free new construction and major renovation
Arlington's bylaw prohibits new fossil fuel infrastructure in new buildings and major renovations. For houses, major renovation includes additions over 1,000 square feet or over 100% of the existing conditioned area, and alterations whose work area tops both 50% of the house and 1,000 square feet.
Source: By-Laws of the Town of Arlington, through 2025 Annual Town Meeting (PDF)
How home additions goes in Arlington.
Arlington defines a large addition as 750 square feet or more, or 50% or more of the existing gross floor area. That triggers mailed notice to everyone within 200 feet before site work and the site-control rules for dumpsters and portable toilets. If the footprint grows by half or more, a Tree Plan goes to the Tree Warden too.
Two thresholds catch people. On an inventoried building, covering more than 25% of a front or side elevation with an addition counts as demolition under the Historical Commission's bylaw, which can mean a 12-month delay. And for fossil fuels, a residential addition over 1,000 square feet, or more than doubling the conditioned area, is a major renovation, so the new space has to be heated electrically.
Questions
Home additions in Arlington, answered.
What counts as a large addition in Arlington?
One that adds 750 square feet or more, or grows the building by 50% or more of its existing gross floor area. Those trigger neighbor notice and site-control rules.
Can an Arlington addition be treated as a demolition?
Yes, on a building on the Historical Commission's inventory, if it removes or covers more than 25% of the front or a side elevation. That can bring a 12-month delay.
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Home additions near Arlington.
Where this information comes from
- By-Laws of the Town of Arlington, through 2025 Annual Town Meeting (PDF)
- Town of Arlington Bylaws: Title VI, Building Regulations
- Town of Arlington: Historic Districts Commission
- Arlington Historic District Commissions: Design Guidelines, revised June 2025 (PDF)
- Arlington Master Plan working paper: Historic & Cultural Resource Areas (PDF)
Rules change. These are summaries of Arlington's and Massachusetts' published rules as of our last check, not legal advice; your project's permits are confirmed with the town when we file them.
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Planning home additions in Arlington?
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