The National Electrical Code added surge-protection requirements for services supplying dwelling units in the 2020 edition through Section 230.67. Later NEC text broadened the listed occupancies. But the rule that applies to a particular home depends on the code edition and amendments adopted by the state or local jurisdiction, the project scope, and the authority having jurisdiction (AHJ).
So the accurate answer is: often required for covered new service work or service-equipment replacement under an adopted edition containing 230.67, but not universally required in every existing US home today.
What NEC 230.67 says in practical terms
The 2020 NEC introduced a requirement for a surge protective device at services supplying dwelling units. The provision called for a Type 1 or Type 2 SPD, integral to the service equipment or immediately adjacent, and applied the requirements when service equipment is replaced.
The 2023 cycle expanded the occupancy language beyond dwelling units to specified sleeping accommodations. Exact wording and exceptions belong to the edition adopted for the project.
NEMA’s industry guidance explains the 2020 requirement and emphasizes that this is service-level surge protection—not a promise that one device addresses every branch, signal conductor, or direct lightning event.
Why the answer varies by location
The NEC is a model code. A state, county, city, or other authority adopts an edition, may amend it, sets effective dates, and enforces it through its own process. At a given moment:
- one jurisdiction may enforce the 2023 NEC;
- another may enforce the 2020 edition;
- another may use an older edition without Section 230.67;
- local amendments may change details; and
- a project may be grandfathered or governed by a permit date.
An online article cannot determine the binding requirement for an address. The local building/electrical department or AHJ can.
New construction, service work, and existing homes
The trigger is usually the permitted scope, not simply home ownership.
New dwelling service
Where the adopted code contains the requirement, a new service for a covered dwelling generally needs compliant surge protection as part of the electrical work.
Service-equipment replacement
Section 230.67 expressly addressed service-equipment replacement. If a project replaces the relevant service equipment under an adopted edition, ask the electrician and AHJ how the requirement applies.
Panel work that is not service replacement
A subpanel replacement, added circuit, repair, or interior panel change may be treated differently depending on where the service disconnect is and what the permit covers. Do not assume that every “panel upgrade” has the same trigger.
Existing home with no electrical project
Code adoption does not necessarily create a retroactive mandate to modify every untouched home. Local law and enforcement determine retroactivity. Voluntary installation may still be sensible even when not legally triggered.
What type of SPD can satisfy the requirement?
The cited provision calls for Type 1 or Type 2, with location requirements. That does not mean any box marketed as “whole house” is compliant. The exact product must be listed, marked for the system and location, and installed according to its instructions and the adopted code.
Type 3 plug-in strips do not substitute for the service-level requirement. They can be a downstream layer. See Type 1 vs Type 2 vs Type 3.
Questions for the electrician or AHJ
- Which NEC edition and local amendments govern this permit?
- Is the project considered a service-equipment replacement or another scope?
- Does Section 230.67 apply to this occupancy and work?
- What Type 1 or Type 2 location is accepted here?
- Must the SPD be integral or immediately adjacent, and does an exception apply?
- Is a permit/inspection required for a voluntary retrofit?
- Are there utility or equipment requirements in addition to the adopted code?
Record the answer and permit basis in the project file.
Code minimum is not the whole design
Passing inspection does not automatically mean every sensitive load and conductor path has coordinated protection. A code-compliant service SPD may still be paired with appropriate Type 3 protection, HVAC-side protection, or signal-line devices. Conversely, more devices do not correct improper grounding, bonding, placement, or incompatible equipment.
Use how to choose a whole-house surge protector after establishing the legal and equipment context.
Avoid these claims
- “Every US home is legally required to have one.”
- “The 2020 NEC automatically took effect nationwide in 2020.”
- “Any Type 1 device can go anywhere.”
- “A plug-in strip satisfies the service rule.”
- “Meeting code guarantees protection from all surge damage.”
Bottom line
NEC 230.67 made service-level surge protection a mainstream requirement for covered work, especially new dwelling services and service-equipment replacement. Whether it is legally required for your project depends on local adoption, amendments, scope, permit date, and AHJ interpretation. Verify those facts before selecting the exact SPD.
Sources
- NEMA — Surge Protective Devices and NEC 230.67
- NFPA — 2026 National Electrical Code overview
- UL Solutions — Panelboard Application Guide
This is general educational context, not a legal determination or code interpretation for a property. The adopted code, AHJ, permit, product instructions, and qualified professional control.