Key takeaways
- Architecture and engineering firms often need their own firm license, called a certificate of authorization in many states, which records the firm's business address.
- Many states require design professionals to form a professional entity such as a PLLC, and some have specific rules, so confirm what your state allows before filing.
- The firm address can appear on stamped drawings and the public firm register, so the address you choose is more visible than for a typical business.
Before you start
- Check whether your state requires a separate firm license or certificate of authorization in addition to your individual professional license.
- Confirm which entity your state allows for design professionals, since the choice between an LLC, a PLLC, and other forms varies.
Who this is for
- Architects and engineers forming a firm to practice on their own.
- Design professionals deciding between an LLC and a professional entity.
- Firm owners who want a professional address on filings and the firm register.
An architecture or engineering firm records its address in places a normal business does not, like the firm's certificate of authorization and the seal on stamped drawings. That makes the address you choose unusually visible, and your entity is governed by professional licensing rules.
This guide covers the firm license most states require, the entity choice for design professionals, where your address shows up, and why all of it varies so much by state.
The Firm Needs Its Own License
A common surprise is that your individual professional license is not enough. Many states license the firm separately from the people in it, usually through a document called a certificate of authorization or a firm registration, and that record carries the firm's business address.
- Individual license: held by the architect or engineer who is in responsible charge of the work.
- Firm license or certificate of authorization: held by the business entity itself, required in many states before the firm can offer services.
- The firm registration records a business address that often appears on a public board register.
The Entity Choice for Design Professionals
Because architecture and engineering are licensed professions, the entity rules are stricter than for a general business. Several states require a professional entity such as a Professional Limited Liability Company (PLLC) or a professional corporation, while others allow a standard LLC, and a few have their own special forms for design professionals.
Confirm your state first
Whether you can use an LLC, must use a PLLC, or fall under a special rule for design professionals depends on the state. California, for example, does not allow an LLC to provide architecture or engineering services at all; a firm there forms instead as a general corporation, a registered LLP, or a professional corporation. Treat any general description as a starting point and confirm with your state board before you form the entity.
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Where the Firm Address Shows Up
The address question matters more here because the firm address is not just on private filings. It can be public and it can travel with your work product.
| Where it appears | What it is | Often public? |
|---|---|---|
| Entity formation | The LLC or PLLC address on state records | Yes, formation records are public |
| Certificate of authorization | The firm license record with the licensing board | Often, on a public firm register |
| Stamped drawings | The firm information that accompanies the professional seal | Visible to clients and reviewers |
| Registered agent | The in-state address for legal and state mail | Yes, on the public record |
Because the firm address can be public and can appear with your seal, the address you choose is unusually visible.
Where a Professional Address Helps
A professional business address can carry the entity and firm-registration layers, which keeps your home address off public records that clients and reviewers can see. The licensing board may have its own rule for the firm address, so confirm that piece, but the rest of the layers are flexible.
- Entity, registered agent, and business mailing can use a professional address rather than your home.
- The firm certificate of authorization address should follow your board's rule, which is the one place to verify.
- A consistent business address across the entity, the firm license, and your bank avoids mismatches.
Before you put an address on a filing, run it through our free Address Checker, and see PLLC vs LLC for licensed professionals for the entity comparison. You can set up a professional business address through save office onboarding.
Working Across State Lines
Design firms often take work in more than one state, and each state usually wants its own firm registration before you can offer services there. The firm address comes up again in each state's process, so a consistent business address makes the multi-state paperwork easier to manage.
For how the firm address differs from the entity and agent addresses, read registered agent address vs business address, and for how license and business addresses differ, business license and virtual address rules.
An architecture or engineering firm is a licensed business, so the setup follows professional rules rather than ordinary ones. The firm usually needs its own certificate of authorization, the entity may have to be a PLLC, and the address you choose can land on a public register and on your stamped drawings. Confirm your state's entity rule first, since that shapes everything after it.
On the address itself, the entity and firm-registration layers can use a professional address that keeps your home private, while the firm license address follows your board's rule. Keep one consistent business address across the filings, and the multi-state expansion that design firms tend to grow into stays manageable.
Frequently Asked Questions
