Can a Drafter Design a House? Drafter vs. Architect vs. Engineer for Builders

In most states, yes: a person who isn't a licensed architect or engineer can legally design a one- or two-family house. The details are where builders get burned. The exemption may cover the architecture law but not the engineering law. It may cap size or stories, or come with required wording on the plans. And a city or county can require a licensed seal anyway.

General information, not legal advice. State summaries reflect statute text read on October 15, 2026. Confirm with the state board or an attorney before relying on any of it.

The three roles

Drafter or residential designer. Prepares house plans and construction drawings. Not licensed by most states as a design professional, and works under a state exemption for houses where one exists. Some hold voluntary credentials, like the American Institute of Building Design's certification. Those are useful, but they aren't licenses.

Licensed architect. Licensed by the state to practice architecture, and able to seal drawings. Required for most commercial and multifamily work. On houses, usually optional unless a state or local rule says otherwise.

Licensed professional engineer (PE). Licensed to practice engineering, and able to seal engineering documents. On houses, PEs most often design foundations, beams and lateral systems that fall outside the code's prescriptive tables, and they seal truss designs for manufacturers.

The practical split on a house: a designer lays out the house and draws it to the code's prescriptive tables, and a PE designs the parts that need calculations.

What Missouri law says

Missouri is one of the clearer states.

• Architecture exemption. RSMo 327.101.2(5) exempts any person designing a privately owned dwelling house or two-family dwelling, if the documents state the preparer is not a licensed architect.
• Engineering exemption. RSMo 327.191.2(5) gives the same exemption for engineering services on the same buildings, with a "not a licensed professional engineer" statement.
• Title rules. The exemptions hold only if the designer doesn't use "architect," "architecture" or "architectural" to imply licensure (327.101.2). The same goes for "engineer" or any suggestion of being able to practice engineering (327.191.2 and 327.181). Under 327.091, using those titles in a way that implies you're an architect is itself treated as practicing architecture.
• Penalties outside the exemption. Practicing while not licensed and not exempt is a class A misdemeanor (327.076). It also brings civil penalties up to $5,000 per offense (327.077), and a contract the designer can't enforce (327.461).

So in Missouri, a designer can legally draw a house, including the foundation and framing plans, for pay, for a builder. Our reading of the text is that this covers a builder's spec house; we found no case law on the point. The exemption doesn't cover new 3- and 4-family buildings, larger commercial buildings, and very likely townhouse rows of three or more units.

The catch is local. Missouri has no statewide residential code, and some cities and counties require sealed plans for new houses even where state law doesn't. Call your building department. See Do House Plans Need to Be Stamped in Missouri? for how to check.

How other states differ

We reviewed the architecture and engineering laws of all 50 states. On the narrow question of whether a non-licensee can sell house plans and residential design for pay, we sorted them into three groups. This is our legal research, not a legal opinion.

• 19 states look clear at the state level, with both laws (or board rules) exempting houses.
• 25 states allow it with real limits. Most often the architecture law exempts houses but the engineering law has no residential exemption.
• 6 states effectively need a licensed partner: Arkansas (for a non-resident designer), Hawaii, Maryland, Nevada, New Jersey and New York.

A few examples, with the statutes:

• North Carolina expressly lets anyone prepare, sell or furnish plans for a family residence. Exempt plans must carry the preparer's signature and address (G.S. 83A-13).
• Wisconsin lets anyone design one- and two-family dwellings (Wis. Stat. 443.14). Its statewide dwelling code also bars municipalities from requiring architect or engineer stamps on dwelling plans, apart from listed floodplain items.
• Kansas exempts buildings of no more than two dwelling units from both laws and separately protects publishing plan books (K.S.A. 74-7031).
• Illinois exempts detached single-family homes from the architecture act (225 ILCS 305/3). A local ordinance can require an architect, though, and calculated structural design falls under the Structural Engineering Practice Act.
• Texas exempts single-family and duplex design from both acts with no size cap. The designer can't use "architectural designer" or offer "engineering," and a PE is still required in specific cases such as slabs on expansive soil that don't meet the code (Tex. Occ. Code ch. 1051, ch. 1001).
• Connecticut exempts one- and two-family dwellings. Since June 24, 2025, unlicensed designers must print "NOT A LICENSED ARCHITECT" on plans, ads and contracts (C.G.S. ch. 390).
• New York exempts only residences of 1,500 sf gross or less, so most new homes need a licensee (N.Y. Educ. Law 7307).
• Nevada licenses residential design as its own profession (NRS 623).

The lesson: "a drafter can design a house" is true in a lot of places, but never true everywhere. The engineering law, not the architecture law, is usually the one that bites.

When to bring in a PE

Even in a state like Missouri, where the law allows a non-PE to do engineering on a house, a builder should bring in a licensed engineer when the design leaves the code's prescriptive tables. The International Residential Code says as much in section R301.1.3: elements beyond the prescriptive limits must be designed under accepted engineering practice.

On houses, the usual triggers are:

• Beams: long flush beams or beams carrying point loads beyond the span and header tables.
• Foundations: problem soils, high groundwater, rock, or deep fill; tall or stepped basement walls retaining more soil than the tables allow; and lots where the building department asks for a soils letter.
• Wind and seismic: high-wind regions, coastal zones and higher seismic design categories. Florida's statewide wind design is the extreme case.
• Open plans and big glass that can't meet the wall-bracing rules.
• Cantilevers and long spans beyond the tables.
• Engineered lumber and trusses. These are designed by the manufacturer's engineer, and the designer specifies them from the manufacturer's tables or software.

One more rule matters in Missouri: a PE can't seal a set they didn't supervise. The supervision rule (20 CSR 2030-13.010) requires direct client contact, initial direction on the design and step-by-step supervision. If you'll need a seal, involve the engineer at the start of the parts they'll seal.

How builders combine them

There isn't one right model. These are the common ones:

1. Designer-only. Prescriptive house in a jurisdiction that doesn't require seals. Trusses and engineered lumber come from the manufacturer. Common for production ranches on good soil.
2. Designer plus PE for specific elements. The designer draws the house, and a PE designs and seals the foundation, a beam, or the lateral system. Common for walkouts, long spans and problem lots.
3. Designer plus a licensed professional in responsible charge. Required where the jurisdiction wants sealed construction documents. The licensee directs and supervises the work they seal.
4. Architect-led. Custom homes, complex sites, or jurisdictions and states that require it.

FAQ

Is drafting legal?
Drafting itself isn't licensed. What's regulated is practicing architecture or engineering, and using those titles. Whether drafting a house for someone counts as either depends on the state's exemptions.

Can a drafter put a stamp on plans?
No. Only licensees have seals. Missouri bars anything resembling a seal on an exempt designer's documents.

Does a drafter carry insurance?
Some do. Ask for proof of professional liability (E&O) coverage. Being exempt from licensing doesn't make anyone immune from a negligence claim.

Why don't you call yourselves architects or engineers?
Because we aren't, and in Missouri the words themselves are regulated. Our plans are prepared by a person who is not a licensed architect or professional engineer, and every sheet says so.

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