Deck Permit Requirements by State: the 200 sq ft Rule and What Changes Locally

If you are reading about deck permit requirements, you probably want one answer: do I need one? Most of the time, yes. The model building code lets you skip a permit for only a small, low, detached deck, and many states and counties are stricter than the model. This guide gives you the model rule, the things that cancel it, a table of what we found for a set of states, and the list of drawings a reviewer asks for.

We cite official pages and say when we only saw a summary of a page. Where we have no source for a place, the table says to check with your building department, because a guess here could cost you a stop-work order.

Do I Need a Permit for a Deck?

Start with the model code, since most local rules are copies of it with changes. Section R105.2¹ of the 2021 International Residential Code lists work that needs no permit. One item covers decks.

The model exemption: four conditions at once

The wording we read in a county copy of R105.2¹ exempts decks not exceeding 200 sq ft, no more than 30 in above grade at any point, not attached to a dwelling, and not serving the exit door required by section R311.4. That is four conditions, not one, and a deck must meet all of them. A 150 sq ft deck bolted to the house wall is not exempt. A freestanding 120 sq ft deck 3 ft off the ground is not exempt either.

Exempt does not mean code-free

The same model section says an exemption does not grant authority to do work in violation of the code or of other laws. So even a deck that needs no permit has to be built to the code, and it still has to respect setbacks and any other local rule. If an inspector never sees it, the rules still apply.

It is only a default

Treat 200 sq ft and 30 in as the model’s starting point and not as a national law. Montgomery County, Maryland, for example, replaced that wording with its own, and Nashville says any new deck needs a permit. The table below shows how far the answers drift.

What Still Triggers a Permit

Even if you are close to the model numbers, a few features push a deck into permit territory in most places. Check each one against your plan.

Attached to the house

A deck with a ledger fastened to the house is attached, and the model exemption does not cover it. The ledger is also where the code is strictest: it must be flashed, fastened on a schedule and kept off some wall types. The deck ledger board guide covers those rules, and the DCA6² guide prohibits a ledger on brick or stone veneer.

Height above 30 in

The model exemption stops at 30 in above grade, measured at any point. The code uses the same 30 in as the point where a 36 in guard is required. A guard has its own rules, a 4 in sphere limit on openings and a 200 lb load at the top rail, and a reviewer wants to see them on the guard detail sheet.

Stairs and landings

Stairs add their own checks: riser height of 7-3/4 in or less, tread of 10 in or more, a width of at least 36 in, and a landing when the total rise passes 12 ft. A handrail is required once a stair has four or more risers. If your deck needs more than a step or two, expect the reviewer to look at the stair sheet. Our deck stairs guide gives the full set of numbers, and if you are adding a pergola, see the pergola permit guide.

Setbacks and HOA rules

A permit-free deck can still break a setback from the property line, an easement or a utility. Those are zoning questions, and the building department may not answer them. A homeowners association can also demand its own approval whether or not the county wants a permit. This is our editorial advice, not a code rule: check both before you buy lumber.

Deck Permit Requirements by State

The table covers ten states, ordered by how often people search for each state’s deck permit rules. We checked the pages named in the last column in November 2026. Where we saw only a search summary of a page, the row says so. Where a cell says “check with your building department,” we did not find an official sentence to quote and we are not guessing.

A short note on reading it: the code edition tells you which version of the model rules a state starts from, “who decides” tells you who issues the permit, and the exemption column quotes or summarizes what the official page says about decks.

What the table shows

Three patterns stand out. Some places copy the model exemption (Houston). Some drop it or say nothing about decks in the exempt list (Virginia, Nashville, Massachusetts). And Montgomery County writes a different test. So you cannot carry a rule from a blog about another state.

Virginia, Massachusetts and Michigan in plain terms

Virginia’s state code lists sixteen kinds of exempt work, among them fences, small detached sheds and walls up to 6 ft, and a deck is not one of them. A new deck therefore falls under the general rule that building a structure needs a permit. We did not find the “30 in freestanding” exemption that some third-party pages claim in the state text.

Massachusetts publishes a chart where decks need a building permit and a Construction Supervisor License for new construction, while patios do not. Michigan asks for a set of construction documents with each application. For a one- or two-family dwelling under 3,500 sq ft, the state does not require an architect or engineer seal on those documents, which matters if you plan to use an unstamped set. Your local office may still have its own rules.

Tennessee and Kentucky in plain terms

In Tennessee the answer changes by city: Nashville wants a permit for any new deck, and a board replacement above 100 sq ft also needs one, while tearing a deck down needs none. Kentucky leaves permits for single-family homes to local ordinance, so a county without one may ask nothing, while a city may ask for a lot. Call before you assume.

What the Permit Office Asks For

Most offices ask for an application, a site plan and construction drawings. The exact list is on the department’s page or a deck handout, and some counties give a one-page checklist.

The usual sheets

A typical set has a site plan, a framing plan, a footing plan, a ledger and flashing detail, a lateral load detail, an elevation, a guard detail and a stair detail. Each member needs its size written on the sheet. Our deck drawings for permit guide goes through all eight.

Ledger and lateral details

If the deck attaches to the house, expect the reviewer to look for the ledger fasteners, the flashing and the lateral hold-downs. The DCA6² guide asks for two hold-down devices rated at least 1,500 lb within 2 ft of the deck edges on an attached deck. The DCA6 explained guide shows where those rows live.

The site plan

Nashville asks for the application plus a site plan with distances to property lines, structures and easements. Other offices ask for the same thing in different words. Measure from the house to each lot line, and mark the deck and any existing sheds, so the reviewer can see the setbacks.

Built Without a Permit

If a deck is already built without one, check your local rules before you do anything else. We have not researched penalties by state and we will not invent any.

What can happen

The general outcomes are things like a stop-work order, a fee to permit the work after the fact, or a request to open parts of the deck for inspection. A missing permit can also surface when you sell or file an insurance claim. The exact result depends on your jurisdiction, so ask.

What to do first

Call the building department and ask how they handle a deck built without a permit. Many offices have a process for it. Bring photos of the framing, footings and ledger if you have them, because they cannot see inside a finished deck.

From Application to Final Inspection

The flow is similar everywhere, even where the forms differ. Know the stages before you pay a fee.

Before you apply

Check the setbacks, ask your HOA and read the department’s deck page. Decide whether your deck is attached, how high it sits and which footing depth your frost line requires. Our deck footing calculator sizes footings for common loads.

Review and inspections

You submit the application and drawings, pay the fee and wait for review. A reviewer may send the set back with comments, which is common when sizes are missing or the notes contradict the plan. After approval, inspections usually happen at footings, framing and final, and the department tells you which ones. Do not pour or cover anything before the inspector has seen it.

After the final

Keep the approved set and the inspection record. They are the proof the deck was built to code, and the next buyer’s inspector may ask for them. For decks that fall outside the prescriptive tables, such as a hot tub deck, an engineer’s design may be needed. Start with the deck span tables to see if your plan fits, then read deck drawings for permit.

If you are not sure your deck needs a permit, ask your building department first. This guide covers the rule and your local obligations. It does not replace their answer.