Brockton, MA Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- R-1A coverage cap
- 20% (Table 1)
- R-1B/C/R-3 coverage cap
- 25% (Table 1)
- Green space, residential
- 25% minimum, R-1A through R-3
- Green space, most commercial
- 10% minimum (C-1, C-2, C-5, C-8)
- Green space, I-2/I-3
- 5% minimum
- Exemption
- Additions/rehab of existing structures excluded
Summary
Brockton limits how much of a lot buildings can cover and requires a separate green-space reserve on top of that: 25 percent minimum green space in every residential zone (R-1A through R-3), 10 percent in most commercial districts and I-1, and just 5 percent in the heavier I-2 and I-3 industrial zones, under § 27-18.
Land coverage by principal and accessory buildings or structures on each zone lot shall not be greater than is permitted in the district where such principal and accessory buildings are located. Every lot shall contain a certain percentage of space reserved for green areas. Such areas shall not be paved or hardtop surfaced and shall be used for landscaping and storm drainage purposes. ... R-1-A Requires a minimum of 25% green space ... C-3 None required ... I-2 Requires a minimum of 5% green space ... The provisions of this section shall apply to every lot with respect to which a building permit or certificate of occupancy for any new structure is hereafter required. Additions, enlargement and rehabilitation of existing structures are excluded.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 28).
Full Breakdown
Section 27-18 layers two coverage controls on new construction. First, buildings on a lot cannot cover more than Table 1, 2 or 3 allows for that district; Table 1 caps residential lot coverage at 20 percent in R-1A and 25 percent in R-1B, R-1C, R-3 and R-4, rising to 30 percent in R-2, while Table 3 allows up to 50 percent in I-1 and 75 percent in I-2 and I-3. Second, and separately, § 27-18 requires every lot to set aside green space that cannot be paved or hardtop-surfaced and must be used for landscaping and stormwater drainage.
That green-space floor is 25 percent in every residential zone from R-1A through R-3, 10 percent in C-1, C-2, C-5 and C-8, none in C-3, and 10 percent in I-1, dropping to 5 percent in I-2 and I-3. C-8 carries an exception: any retail use with at least 50,000 square feet of floor area on at least 5 acres only needs 5 percent green space instead of the usual 10 percent. The green-space rule applies to every lot where a building permit or certificate of occupancy is required for a new structure, but it does not reach back to additions, enlargements or rehabilitation of buildings that already exist, so an owner adding onto an existing house is not forced to retrofit the lot to the newer green-space percentage.
Violations & Fines
Covering more of a lot than Table 1, 2 or 3 allows, or paving over the required green-space reserve, violates § 27-18. The inspector of buildings enforces the limit at the permit stage under § 27-51 and will not sign off on a certificate of occupancy under § 27-52 for a lot that exceeds its coverage cap or falls short of its green-space minimum.
Frequently Asked Questions
How much of my residential lot can I build on in Brockton?
Does the green-space rule apply if I'm just adding a room onto my house?
Why does C-8 sometimes only need 5 percent green space instead of 10?
Sources & Official References
Other rules in Brockton
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