Reviewed and updated October 12, 2026 by the SearchSystems.net editorial team. Every fact on this page was read from the California DMV's own pages that day, and the DMV page each fact came from is linked where it appears.
How the California DMV registers a vehicle that was built rather than bought, and what an owner must report after altering a vehicle: what a specially constructed vehicle is and is not, the REG 343 and the Statement of Construction, the bills of sale for the major components, the verification, safety inspection, smog and weight certificates, and the $2,000 or weight-class threshold that makes a body change reportable. A vehicle rebuilt after a total loss is a different case, on the salvage and junk vehicles guide; the commercial weight rules are on the commercial vehicle guide.
In this guide: What a specially constructed vehicle is, Registering a specially constructed vehicle, The verification, the safety inspection and the smog check, Reporting an altered vehicle, Questions about kit and altered vehicles in California
What a specially constructed vehicle is
A specially constructed or modified vehicle, SPCNS in the DMV's abbreviation, is a homemade or kit vehicle built for private use, not made by a licensed manufacturer and not eligible for resale, per the DMV's specially constructed or modified vehicle registration page. It may be built from a kit and may combine new and used parts, especially when it is constructed from a junked vehicle that was previously dismantled. The DMV draws the line at recognizability: a vehicle repaired or restored with replacement parts, or modified from its original design, is not a specially constructed vehicle, and its example is a Volkswagen Beetle with modified fenders, engine compartment lid and front end, which is still recognizable as a Beetle. The DMV's registration overview groups the specially constructed vehicle with imported, off-highway, salvage and commercial vehicles as the cases with their own rules; the ordinary purchase from a dealer or a private party is on the vehicle registration guide.
Registering a specially constructed vehicle
The DMV's list for a specially constructed vehicle, including a kit commercial vehicle: a completed Application for Title or Registration (REG 343); a vehicle verification by an authorized DMV employee, which means bringing the vehicle to a DMV office; a completed Statement of Construction (REG 5036); bills of sale and receipts for the major component parts, which the DMV names as the engine, frame, transmission and body; for a trailer built from a purchased kit, the Manufacturer's Certificate of Origin or a receipt or invoice identifying the kit; an electronic Vehicle Safety Systems Inspection certificate; a weight certificate from a California Certified Public Weighmaster for a pickup or truck; a smog certification; and the registration fees. The application begins at a DMV office, found on the California DMV offices list. Parts that came from a dismantled vehicle connect to the junk receipt the DMV issued for it, which the salvage and junk vehicles guide explains.
The verification, the safety inspection and the smog check
The DMV's list carries three checks. The vehicle verification is done by an authorized DMV employee at a DMV office. The Vehicle Safety Systems Inspection produces an electronic certificate the DMV requires on the application. The smog certification follows the rules on the DMV's smog inspections page and the smog check guide. A pickup or truck adds a weight certificate from a California Certified Public Weighmaster. Once registered, the vehicle pays the ordinary fees: the $76 registration fee including the $3 alternative fuel and technology fee, the $34 CHP fee, the vehicle license fee and the local fees on the California DMV fees page.
Reporting an altered vehicle
An owner who changes or alters a vehicle's body and spends $2,000 or more on the alterations, or whose alterations place the vehicle in a different weight classification, must report the alterations to the DMV. The report needs the vehicle's California Certificate of Title; a vehicle verification by an authorized DMV employee completed after the alteration is finished, again by bringing the vehicle to a DMV office; a completed Statement of Facts, Vehicle Body Change Statement (REG 256); a weight certificate from a California Certified Public Weighmaster; evidence of purchase or ownership of the added parts, such as bills of sale, invoices or sales slips; the license plate number or vehicle identification number of the other vehicle, when the body came off another vehicle the owner owns; and any additional fees due when the vehicle falls into a higher weight classification. The DMV's fee schedule lists an engine change fee of $2 under Vehicle Code section 9267. For a registered commercial vehicle the DMV adds that additional weight fees are due from the date of first operation after an alteration that raises the weight class, and that no refund is given when the class goes down.
Questions about kit and altered vehicles in California
What counts as a specially constructed vehicle?
A homemade or kit vehicle built for private use, not made by a licensed manufacturer and not eligible for resale, per the DMV; it may combine new and used parts, including parts from a junked vehicle that was previously dismantled.
Is my modified car a specially constructed vehicle?
Not if it is still recognizable as what it was. The DMV says a vehicle repaired or restored with replacement parts, or modified from its original design, is not an SPCNS, and gives a Volkswagen Beetle with modified fenders, engine lid and front end as its example.
When must I report an alteration?
When the body change costs $2,000 or more, or when the alteration moves the vehicle into a different weight classification, per the DMV.
Does a kit car need a smog check?
Yes. The DMV lists a smog certification among the requirements for registering a specially constructed vehicle, along with the electronic Vehicle Safety Systems Inspection certificate.
Who verifies the vehicle?
An authorized DMV employee, at a DMV office, both for a new specially constructed vehicle and for an altered vehicle after the alteration is complete.
Do I need a weight certificate?
For a pickup or truck, yes, from a California Certified Public Weighmaster, both for a specially constructed vehicle and for a reported alteration; a vehicle that moves into a higher weight class owes additional fees.
Written by SearchSystems.net from the California DMV's specially constructed or modified vehicle registration page, commercial vehicle registration page, smog inspections page and registration fees page, read on October 12, 2026.