Class 37 is the contractor-and-tradesperson class — builders, plumbers, electricians, HVAC installers, auto-repair shops, and property-maintenance companies. But the single most important thing to understand about it isn't what it covers, it's what it doesn't: Class 37 protects the act of building, fixing, or installing, never the physical materials used to do it.
Materials, Design, and Service — Three Different Classes
| What it is | Class |
|---|---|
| Cement, lumber, bricks, non-metal building products | 19 (goods) |
| Architecture and engineering design | 42 (services) |
| Building, repair, installation, cleaning | 37 (services) |
| Real estate services | 36 (services) |
A design-build firm that both designs and constructs a building needs two separate registrations — Class 42 for the design work, Class 37 for the physical construction. Filing only one leaves the other side of the business exposed to a copycat.
What's Actually Inside Class 37
Building construction and general contracting, renovation and remodeling, repair and maintenance of buildings, equipment, and vehicles, plumbing, electrical, and HVAC installation, roofing, flooring, and painting services, automotive repair and servicing, cleaning services from janitorial to pressure washing, and pipeline, road, and infrastructure construction. Repairing vehicles specifically sits here too, alongside building repair — the vehicles themselves are Class 12 goods, but the service of fixing them is Class 37.
The design-build trap: architecture and engineering are Class 42, not Class 37. A firm doing both needs both classes — filing only Class 37 leaves the design side unprotected, and vice versa.
Why Contractor Names Keep Getting Refused
Construction and repair brands face a high refusal rate because the industry leans hard on descriptive, geographic naming — "Quality Construction," "Bay Area Plumbing," "Reliable Roofing." These describe the service or the location and get refused as merely descriptive or geographically descriptive as a matter of routine. The trades are full of names that simply cannot be registered as filed. The way through is the same as in every class: a coined or arbitrary name registers far more easily than a literal description of the trade and territory, and a contractor building a brand meant to last, or to franchise, is better served by distinctiveness than by keyword-stuffed description. Where a name sits on the distinctiveness scale determines how easily it clears.
Franchise Brands Are the Class's Center of Gravity
Class 37 isn't dominated by a handful of global brands the way some goods classes are — it's driven more by national contracting, home-services, and automotive-repair franchises. Home-services networks that license a name to local operators for plumbing, HVAC, restoration, or cleaning are a major source of Class 37 filings, because a franchise model depends entirely on a strong, registrable brand it can protect across many territories at once. National restoration companies and automotive-repair chains round out the class.
Quick answers: Building materials are Class 19 goods, not Class 37 — a company that both manufactures materials and provides construction services files in both. Class 42 covers architecture and engineering; Class 37 covers the physical construction, and a design-build firm needs both. Vehicle repair is Class 37, same as building repair, even though the vehicles themselves are Class 12. And a construction name gets refused most often for being descriptive or geographically descriptive — a distinctive, coined name clears far more easily and travels better if you franchise later.
Trade and contracting names crowd heavily by service and region, so clearance is worth the time. Use tmarkmetric to browse registered Class 37 trademarks and search the broader registry before you commit to signage, trucks, and a franchise brand. See our Class 42 guide for the design side, and our Class 35 guide for franchising and business operations.