How to Start an LLC for a Custom Millwork Business

A business name is the first thing a potential client or general contractor sees, before the portfolio and before the bid. Getting the name right legally is the priority before getting attached to it creatively. Most states require the name to include “LLC” or “Limited Liability Company” at the end. Some states accept abbreviations like “L.L.C.,” but that varies, so checking the specific state’s rules before filing is worth the extra few minutes. Certain words are restricted or prohibited outright — terms like “Bank,” “Insurance,” or “Engineering” typically require additional licensing or regulatory approval to use in a business name. The name also must be distinguishable from any other registered entity in the same state, which is verified through the Secretary of State’s business entity database.

After confirming the name is available at the state level, it is worth checking the U.S. Patent and Trademark Office (USPTO) database for any federal trademark conflicts. Securing a matching domain name at the same time protects the shop’s online presence before someone else claims it. Many states allow a name reservation for 60 to 120 days, which gives the owner time to complete the remaining formation steps without losing the name. A few examples of names that work well in this trade:

• Oak & Iron Millwork LLC — the material references signal craft and durability to commercial clients who want to know what the shop actually builds

• Precision Architectural Woodworking LLC — positions the business as a high-end, detail-oriented operation, which resonates with architects and luxury residential developers

• Valley Custom Cabinetry LLC — the regional identifier helps with local search visibility and communicates community roots to residential clients

Every LLC is required to designate a registered agent, sometimes called a statutory agent or resident agent depending on the state. A registered agent is a person or business entity designated to receive official government correspondence, tax notices, and legal documents on behalf of the LLC. The agent must maintain a physical street address in the state of formation — a P.O. box does not qualify in most states.

The business owner can serve as their own registered agent, provided they are consistently available at the listed address during standard business hours. For a millwork operator who spends most of the day in the shop or on job sites, that availability can be difficult to guarantee. A professional registered agent service keeps the owner’s home address off public records and ensures that time-sensitive legal documents are never missed while the owner is running a table saw or managing an installation crew. When evaluating services, the factors that matter most are reliability, how quickly they forward documents, and annual cost — most services run between $50 and $150 per year.

Filing the Articles of Organization is the step that officially creates the LLC. Some states call this document a Certificate of Formation or Certificate of Organization, but the function is the same: it is the formation document submitted to the state’s business filing office, typically the Secretary of State, to bring the entity into legal existence. The form generally asks for the LLC name, the registered agent’s name and address, the principal office address, the names of the organizers, and whether the LLC will be member-managed or manager-managed. Member-managed means the owners run day-to-day operations themselves. Manager-managed means the owners appoint one or more managers to handle operations, which can be useful if a millwork shop has a silent investor or a partner who handles the business side while another handles the craft.

Filing fees range from approximately $40 to $500 depending on the state, with most falling between $50 and $150. Processing times vary from a few business days to several weeks. Many states offer expedited processing for an additional fee, which can matter if the owner is trying to get the entity in place before signing a commercial lease or a large project contract.

An operating agreement is an internal document that defines how the LLC is governed. It covers how profits and losses are distributed, how decisions get made, what happens if an owner wants to exit, and how the business would be wound down if it dissolved. Most states do not legally require one, but operating without one leaves the LLC vulnerable in ways that are easy to avoid.

For a single-member millwork LLC, the operating agreement establishes on paper that the business is a separate entity from the owner. That distinction matters if the LLC’s liability protection is ever challenged in court. For a two-person shop where one partner manages fabrication and the other handles client relationships and sales, the agreement clarifies who has authority over what, how profits are split, and what happens if one partner wants to leave. In a custom millwork business specifically, the operating agreement is a good place to document who owns the shop equipment contributed at formation, how large material purchases get approved, and whether the business can take on outside investors down the road. These are not hypothetical concerns — they are the exact disputes that tear apart small trade businesses when they are not addressed in writing from the start.

An EIN, or Employer Identification Number, is a nine-digit federal tax ID issued by the IRS. It works like a Social Security number for the business and is required to open a business bank account, hire employees, file federal taxes, and establish trade credit accounts with lumber yards and hardware suppliers. The application is free and processed immediately when completed online through the IRS website.

By default, a single-member LLC is taxed as a sole proprietorship, meaning profits and losses pass through to the owner’s personal tax return. A multi-member LLC is taxed as a partnership by default, with the same pass-through treatment. Neither structure pays federal income tax at the entity level, which avoids the double taxation that C corporations face. As the millwork business grows and net income increases, the owner may be able to elect S corporation tax treatment, which under certain conditions can reduce self-employment tax obligations. That election generally makes financial sense when the business is generating enough profit that paying the owner a reasonable salary and treating remaining distributions differently produces meaningful tax savings. A tax professional familiar with trades businesses can help determine whether and when that election makes sense. Custom millwork businesses that sell finished products — cabinetry, shelving units, furniture — may also be required to collect and remit sales tax depending on the state. Requirements vary significantly, and some states treat custom fabrication differently from retail sales, so checking with the state’s department of revenue is the right starting point.

Licensing for a custom millwork business depends on the state, county, and city where the shop operates, and on the type of work the business takes on. Most jurisdictions require a general business license to operate commercially, and that is typically obtained through the city or county clerk’s office. Beyond the general license, millwork businesses that handle on-site installation — built-in cabinetry, staircases, architectural trim, or paneling — often fall under contractor licensing requirements. Many states require a specialty contractor license or a general contractor license for installation work that exceeds a certain dollar threshold. Some states have a specific finish carpentry or cabinet installation license category. The relevant licensing board is usually the state contractor licensing board or the department of consumer affairs, and requirements vary enough that checking directly with that agency is the most reliable approach.

Zoning is another layer to address early. A commercial woodshop generates noise, sawdust, and chemical fumes from finishes and adhesives, which means the operation generally must be located in an industrially or commercially zoned space. Operators starting out of a residential garage face additional scrutiny — many municipalities restrict the type and scale of commercial activity permitted under a home occupation permit, and noise ordinances can limit operating hours. Fire department permits are common for shops that store combustible materials like lumber, sawdust, and finishing chemicals. General liability insurance is a practical requirement for any millwork business bidding on commercial projects, and workers’ compensation coverage is legally required in most states once the business has employees. Some general contractors will not issue subcontracts to shops that cannot provide a certificate of insurance, so getting coverage in place early removes a barrier to landing larger work.

Once the LLC is formed and the EIN is in hand, opening a dedicated business bank account is the next concrete step. Commingling business funds — even occasionally — can undermine the legal separation the LLC was formed to create. Courts refer to this as “piercing the corporate veil,” and it can expose the owner’s personal assets to business liabilities even when the LLC is otherwise properly maintained.

Banks typically require the EIN, a copy of the Articles of Organization, a government-issued ID, and sometimes the operating agreement to open an LLC account. Setting up the account immediately after formation means client deposits, material purchases, and subcontractor payments all run through the business from day one, which keeps the financial records clean and makes tax preparation significantly less complicated. A business credit card is worth considering alongside the bank account. Custom millwork projects often require large upfront material purchases before the client’s final payment clears, and a card with a meaningful credit limit helps manage that cash flow gap. It also builds the business’s credit profile over time, which matters when the shop eventually wants to finance equipment or expand the workspace.