Swimming pool rules in Belmont, Massachusetts
Yes. Private swimming pools are allowed in Belmont's Single Residence and General Residence districts, and the Zoning By-Law requires them to comply with the State Building Code, which means a building permit and a 48-inch safety barrier. Pools count as structures, and the setback rules for accessory buildings (5 ft from side and rear lines) likely apply.
| Allowed in residential zones | Yes (Y) in Single Residence A-D and General Residence; special permit in AH [1] |
| Code compliance | Must comply with the State Building Code (780 CMR) [2] |
| What counts as a pool | In-ground or above-ground; excludes portable pools that can't hold more than 24 inches of water [3] |
| Setbacks | Likely 5 ft from side and rear lot lines (accessory-building setbacks for recreational facilities) [5] |
| Pools are structures | Yes; count toward setbacks and lot coverage [4] |
Allowed use
The use table lists "swimming pools and tennis courts and other similar recreational facilities" as allowed (Y) in the Single Residence A-D and General Residence districts and by special permit in the AH and Local Business districts [1].
Building code compliance
Section 6.1 is short: swimming pools must comply with all applicable State Building Codes (780 CMR) [2]. In practice that means a building permit from the Building Division, a barrier (fence) at least 48 inches high with self-closing, self-latching gates, and electrical permits for pumps, lights and heaters (see the state rules section). Hot tubs and spas are also covered by the state code.
What counts as a pool
The by-law defines a swimming pool as any in-ground or above-ground artificial receptacle for water used by the owner or tenant, family and invited guests without a fee, but not portable pools that can't hold more than 24 inches of water at any point [3]. Shallow kiddie pools are outside the definition.
Setbacks and lot coverage
Swimming pools are expressly included in the by-law's definition of a structure [4], so they're subject to setback and lot coverage rules. Section 4.3.6 applies the accessory-building setbacks of Section 4.3.5 to tennis courts and "other similar recreational facilit[ies]" used as accessory uses, and applies the full Section 4.2 setbacks when the facility is in the front yard [5]. Accessory-building setbacks are 5 ft from the side and rear lot lines and 5 ft from the house. The by-law doesn't name pools in Section 4.3.6, so confirm with the Building Division which setback it applies. Keep the pool in the back yard to avoid front-setback issues.
Near wetlands or floodplain
A pool in the Floodplain District or within the Conservation Commission's jurisdiction near a wetland needs those reviews too.
See how Belmont compares with 8+ other Massachusetts towns on swimming pools →
Next steps
- Ask the Building Division (617-993-2650) which setback applies to your pool and whether it fits your lot coverage limit.
- Have plans prepared (in-ground pools need a registered design professional under the state code) and apply for a building permit and electrical permit.
- Plan a compliant barrier at least 48 inches high with self-closing, self-latching gates.
- If the yard is near a brook, pond or wetland or in a FEMA flood zone, check with the Conservation Commission first.
Common questions
- Do I need a permit for a pool in Belmont, Massachusetts?
- Yes. The Zoning By-Law requires pools to comply with the State Building Code, which in practice means a building permit and electrical permits for pumps, lights and heaters.
- Do I need a fence around a pool in Belmont, Massachusetts?
- Yes, in practice. The State Building Code requires a barrier at least 48 inches high with self-closing, self-latching gates.
- How far must a pool be from the property line in Belmont, Massachusetts?
- Pools count as structures, and the accessory-building setback of 5 ft from side and rear lot lines likely applies. The by-law doesn't name pools in that section, so confirm with the Building Division.
- Does an above-ground pool count as a pool in Belmont, Massachusetts?
- Yes. In-ground and above-ground pools are covered. Portable pools that can't hold more than 24 inches of water are excluded.
Massachusetts building code rules for pools
Under the State Building Code (780 CMR, 10th edition), residential pools, spas and hot tubs must meet the 2021 International Swimming Pool and Spa Code (ISPSC) as adopted in Massachusetts.
Permits:
- A building permit is needed for any pool except prefabricated pools under 24 inches deep.
- Plans for in-ground pools must be prepared by a registered design professional (an engineer or architect).
- Wiring must meet the Massachusetts Electrical Code (527 CMR 12.00), and gas pool heaters must meet the state plumbing and gas code (248 CMR).
Barrier (fence) requirements (ISPSC §305):
- The barrier must be at least 48 inches high, measured on the side away from the pool.
- The gap under the barrier can be no more than 2 inches over grass or gravel, or 4 inches over concrete.
- Pedestrian gates must open outward away from the pool, be self-closing and self-latching, and be able to take a lock.
- If a house wall forms part of the barrier, doors and low windows opening to the pool need an audible alarm (or another listed option).
- In-ground pool construction sites need temporary fencing at least 4 feet high from excavation until the permanent barrier is up.
- Spas and hot tubs with a lockable safety cover meeting ASTM F1346, and pools with a powered safety cover meeting that standard, are exempt from the barrier rules.
Local zoning still controls pool setbacks, and wetlands rules may apply near water.
What the bylaw says
- §3.3 Schedule of Use Regulations, Accessory Uses (Continued), Zoning By-Law (as amended through March 3, 2025; approved July 2, 2025) - complete town PDF, p. 40
Swimming pools and tennis courts and other similar recreational facilities Y Y SP SP SP SP N N
- §6.1 Swimming Pools, Zoning By-Law (as amended through March 3, 2025; approved July 2, 2025) - complete town PDF, p. 83
Swimming pools must be compliant with all applicable State Building Codes (780 CMR: State Board of Building Regulations and Standards).
- §1.4 Definitions, Swimming Pool, Zoning By-Law (as amended through March 3, 2025; approved July 2, 2025) - complete town PDF, p. 21
Swimming Pool - An artificial receptacle capable of containing a body of water, whether in or above ground, or created by artificial means from a natural watercourse, and all appurtenances, equipment, appliances and other facilities for its operation, maintenance or use, used or intended to be used by the owner or tenant thereof and his/her family and by friends invited to use it without payment of any fee, but not including portable or other pools incapable of containing a depth of water exceeding 24 inches at any point.
- §1.4 Definitions, Structure, Zoning By-Law (as amended through March 3, 2025; approved July 2, 2025) - complete town PDF, p. 20
Structure - Anything constructed or erected, the use of which requires fixed location on the ground, including buildings, mobile homes, signs, swimming pools, pergolas, and tanks, but for purposes of this By-Law not including walls, fences, or paving.
- §4.3.6 Tennis Courts and Similar Recreational Facilities, Zoning By-Law (as amended through March 3, 2025; approved July 2, 2025) - complete town PDF, p. 54
The setback regulations which apply to an accessory building in Section 4.3.5 shall also apply to a tennis court and other similar recreational facility as an accessory use. Where a tennis court or other facility is the principal use on a lot or is located in the front yard, the setback regulations of Section 4.2 shall apply.