Do You Need a Permit to Repair a Deck?

Cutaway diagram of a deck attached to a house, color-coded: green deck boards often need no permit, amber railing depends on the city, and red joists, ledger, beam, posts and footings usually need a permit

Replacing deck boards in kind is often permit-free, but repairing railings, stairs, or framing usually is not, and a deck damaged by a storm or fire typically needs a repair permit to bring it back to pre-damage condition.

A few soft boards, a wobbly railing, or a stair stringer that has started to split: most deck repairs begin with one problem you can see from the patio door. Before you pull up the first board, it helps to know whether your city treats the job as ordinary maintenance or as permit work, because a lot of deck repairs land on the permit side of that line.

The answer depends on which part of the deck you are touching. Swapping a few deck boards for the same material is exempt in many of the city and county rules we read. Railings, joists, beams, posts, the ledger, and stairs are a different story. And a few places, including Blaine and Spring Lake Park in Minnesota, require a permit even for decking and guardrail repairs.

For this guide we read deck repair pages, exemption lists, and deck construction handouts from Truckee, Dana Point, and Berkeley, California; Issaquah and Edmonds, Washington; Chicago; Carroll County and Montgomery County, Maryland; Fairfax County and the City of Fairfax, Virginia; Blaine, Spring Lake Park, and Minneapolis, Minnesota; St. Louis County, Missouri; and the State of Oregon. Where they disagree, we show both sides rather than inventing a national rule. Confirm the details with the building department that covers your address.

Do you need a permit to repair a deck? The short answer

For like-for-like deck boards, often no. For railings, structure, and stairs, often yes. Here is what each jurisdiction actually publishes:

Carroll County, MD: “If any structural members, guardrails or stairs are to be replaced, a permit is required. Replacement of only the deck boards does not require a permit.” The county still recommends following the manufacturer’s installation instructions. (Carroll County: Permits & Inspections FAQ)
Issaquah, WA: any repair, addition, or modification to a deck more than 30 inches above grade (measured to the lowest point within 6 feet of the deck) needs a permit, and “removing, altering or repairing railings or guards is considered a modification.” Replacing or repairing only non-structural decking boards is exempt. (City of Issaquah: Decks & Fences)
Truckee, CA: by town policy, replacing up to 66 square feet of deck boards or 33 lineal feet of railing is exempt. Replacing more than that, or replacing joists, beams, or stairs, requires a building permit. (Town of Truckee: Deck Permits)
Chicago, IL: no permit is needed to replace a non-structural element in kind, “such as a deck board, stair tread, or railing picket,” as long as you have not received a building violation. On residential buildings up to four stories, an entire porch, deck, or stair system can be repaired or replaced in kind without a permit if it is no more than 6 feet above the ground and has a landing area of 50 square feet or less. (City of Chicago: Porches, Decks, and Balconies)
St. Louis County, MO: you can repair or replace up to 50% of the finish decking with like material, and up to 50% of the guard, without a permit. A permit is required to replace joists, beams, headers, ledger boards, or columns, to go past 50%, or to switch materials, such as replacing wood with plastic or composite. (St. Louis County: When is a Building Permit required for Residential Projects?, posted by the City of Wildwood)
Edmonds, WA: the city’s exemption list includes “replacement or repair of individual decking, joists, stair treads, or intermediate rails.” The exemptions do not apply on property designated as an earth subsidence and landslide hazard area or a critical area. (City of Edmonds: Work Exempt From a Building Permit)
Berkeley, CA: “A building permit is required to repair or replace most parts of a typical wood deck, balcony or exterior stairway.” Cutting, notching, or replacing joists, beams, posts, piers, or stringers needs a permit. Repairing stair treads, risers, decking, or guardrail components typically does not, but must still meet code. (City of Berkeley: Form 148, E3 Repairs)
Blaine, MN (and Spring Lake Park, MN): “A permit is required for all decks and deck repair (decking and guardrails),” with exceptions for on-grade patios and for low decks that are not attached to a structure with frost footings and have no door exiting onto them. (City of Blaine: Deck/Porch/Ramp; City of Spring Lake Park: Deck Information)
Dana Point, CA: repairs and like-for-like replacements need a permit under any one of a list of conditions, including a deck supported by the house, a deck more than 30 inches above grade near its edge, a deck in a Very High Fire Hazard Severity Zone, coastal flood plain, or coastal bluff area, and replacement of posts or beams on a non-exempt deck. (City of Dana Point: B031 Deck handout)

Read those side by side and the pattern is clear, but so are the splits. Edmonds exempts repairing individual joists; Truckee, Berkeley, St. Louis County, and Carroll County all put joist or structural work on the permit side. Carroll County exempts deck boards outright; Blaine requires a permit for decking repair. Neither is “the” national rule. Your local list decides.

Repair or replacement? Why the wording matters

Most building codes start from the idea that repairing, altering, or replacing a structure needs a permit, and then carve out exceptions. St. Louis County says a permit is required to “construct, enlarge, alter, repair, move, demolish & replace” a structure. Truckee says building permits are generally required to repair or replace buildings and structures, “This includes decks,” before it lists its exempt amounts.

The carve-outs tend to cover small, like-for-like work. Oregon’s Building Codes Division exempts repairs “using like materials or materials meeting new construction requirements” that do not involve cutting away a wall, removing or cutting any structural beam or load-bearing support, or affecting required exits (Oregon BCD: Do I need a permit?). The City of Fairfax, Virginia, lists decks as work that needs a building permit, but its building code section 108 exempts ordinary repairs (City of Fairfax: Permit FAQs).

Two practical tests come up again and again:

Same material, same size, same place? Chicago defines in-kind replacement as using new materials “of the same type, size, and shape.” A wood board for a wood board is in kind. A composite board for a wood board is not, which is exactly why St. Louis County requires a permit for that switch.
How much of the deck? Truckee draws the line at 66 square feet of boards or 33 lineal feet of railing. St. Louis County uses 50% of the decking or guard. Montgomery County, Maryland, has a restore/repair permit for replacing part of a building “to correct damage,” but its scope is limited to work on an element and “does not include complete or substantial replacement” (Montgomery County DPS: Residential Restore / Repair Permit).

Before you call the job a “repair,” count what you are actually replacing. Ten boards and fifty boards are not the same project in Truckee or St. Louis County.

Replacing deck boards

This is the job most homeowners mean when they ask about deck repair, and it is the one most often exempt. Carroll County, Issaquah, Chicago (in kind), Edmonds, and Berkeley all treat replacing or repairing decking without touching the frame as no-permit work. Montgomery County, Maryland, also lists floor coverings, patios, and private walkways among items that most likely do not need a permit, but it lists “Deck” on the permits-required side, so ask DPS before you treat a board swap there as exempt (Montgomery County DPS: Permits Required / No Permits Required).

Painted gray porch deck where a strip of old boards has been replaced with new unpainted brown wood boards next to the white railing

Photo: Ridunwig, CC0, via Wikimedia Commons

How many boards before it counts?

Thresholds are where cities disagree the most:

No stated limit for boards only: Carroll County, Issaquah, Edmonds, and Berkeley.
Square-foot limit: Truckee exempts up to 66 square feet of deck boards.
Percentage limit: St. Louis County exempts up to 50% of the finish decking with like material. Dana Point lists “repair or replacement of the decking area over 10% of the total deck area” among the permit items for decks that are not exempt.
Permit for decking repair: Blaine and Spring Lake Park, Minnesota.

Those are different numbers on purpose. Do not average them; find the one your city publishes.

Switching from wood to composite

Resurfacing a deck with composite is a popular upgrade, and it is where a “board swap” can turn into permit work. St. Louis County requires a permit to replace the finish decking, guard, or stair treads with a different material, “such as replacing wood with plastic or composite products.” Fairfax County’s Typical Deck Details allow PVC decking and guards only if they have a valid evaluation report from an accredited listing agency, such as ICC Evaluation Service, and must be installed to that report and the manufacturer’s instructions, which must be available to the inspector (Fairfax County: Typical Deck Details, based on the 2021 Virginia Residential Code). The same handout warns that some composite members do not have the same capacity as their wood equivalents. Composite spans are set by the manufacturer, and Spring Lake Park’s handout makes the same point: joist spacing depends on the decking you choose. If your existing joists are too far apart for the new boards, the “resurface” becomes a framing job.

Look under the boards before you order

Once the old decking is off, you can see the joist tops, the ledger, and the hardware. Fairfax County’s safety checklist asks homeowners to look for wood rot, splitting, insect damage, rusted or corroded fasteners, and loose connections where the deck attaches to the house (Fairfax County: How to Ensure the Safety of Your Decks). If you find damage to the frame, the permit question changes along with the scope.

Railings and guards: the repair that most often needs a permit

The building code calls a deck railing a “guard.” It is the part that keeps people from falling off, and it is the repair cities are least relaxed about.

Side-by-side diagram of deck guards: 36-inch minimum height cited by Fairfax County, VA and Spring Lake Park, MN versus 42-inch minimum cited by Dana Point and Truckee, California, with a 4-inch sphere opening test

Where a guard repair needs a permit. Carroll County requires a permit if guardrails are replaced. Issaquah treats removing, altering, or repairing railings or guards on a deck more than 30 inches above grade as a modification that needs a permit. Blaine and Spring Lake Park require a permit for guardrail repair.

Where small guard repairs are exempt. Chicago exempts replacing a railing picket in kind. Edmonds exempts intermediate rails. Berkeley says repairing guardrail components does not typically need a permit. Truckee exempts up to 33 lineal feet of railing. St. Louis County exempts repairing or replacing up to 50% of the guard components, or up to 50% of the guard’s length, with like materials.

Old guards vs. current code. Truckee explains why this matters: guard rules have changed over the years. The allowed opening was once 9 inches, then 6, and must now be less than 4. Truckee treats changing less than 50% of a guard as a repair that can meet the code in effect when the deck was built; more than 50% is replacement and must meet current code. St. Louis County says that when you replace more than 50% of a guard, the entire guard must be brought up to current code.

36 or 42 inches? This is one of the clearest conflicts in the sources. Fairfax County’s deck details require a guard when the deck is more than 30 inches above grade, set the minimum guard height at 36 inches, and require openings that stop a 4-inch sphere. Spring Lake Park also lists a 36-inch minimum. In California, Dana Point says all residential guards need a minimum 42-inch height, and that removing, relocating, or replacing guardrail posts or rails on a non-exempt deck triggers an upgrade from 36 to 42 inches. Truckee also notes that guard height has increased from 36 to 42 inches. If you are in one of these California cities, plan on 42 inches; elsewhere, check the residential code your city has adopted before you order railing parts.

Posts are structure. Fairfax County prohibits notching guard posts and requires hold-down anchors with a minimum capacity of 1,800 pounds to attach guard posts. A loose railing post is usually a connection problem, not a cosmetic one.

Joists, beams, posts, and the ledger

This is the part of the deck that holds everything up, and in almost every source we read it is permit territory:

Truckee: replacing joists or beams requires a building permit.
Berkeley: cutting, notching, or replacing joists, beams, posts, piers, and stringers needs a permit. Treating or scraping and painting dry rot “without cutting a framing member” does not.
St. Louis County: replacing joists, beams, headers, ledger boards, or columns needs a permit.
Dana Point: modifying or replacing posts or beams on a non-exempt deck needs a permit.
Carroll County: replacing any structural member needs a permit.

The exception is Edmonds, which lists repairing or replacing individual joists as exempt. That is a published local rule, not a general one.

The ledger deserves special attention. The ledger is the board that attaches the deck to the house. Fairfax County’s deck details require the house siding to be removed before a ledger is installed, prohibit attaching a ledger through brick veneer, and specify flashing at the ledger connection. Blaine requires a footing/ledger inspection, and unless the deck is freestanding, the inspector must have access to the inside of the home to verify the attachment. If positive attachment cannot be verified, Blaine’s handout says the deck must be self-supporting.

Hardware and fasteners. Fairfax County requires hot-dipped galvanized or stainless steel fasteners (or ones approved for treated lumber), and joist hangers and post anchors that are stainless or G-185 galvanized. Old, thinly coated hardware on a deck built with modern treated lumber is a common reason a repair grows.

Deck stairs

Deck stairs are treated like the frame in most places. Truckee requires a permit to replace stairs. Carroll County requires a permit if stairs are replaced. St. Louis County exempts replacing handrails, treads, and riser finish boards with like materials but requires a permit to replace an entire exterior stair or stair run. Dana Point says that if a deck repair includes a stair with more than 3 risers, a handrail is required. For the full stair picture, including tread and riser dimensions that change by city, see our guide to stair replacement permits.

Rebuilding the whole deck in the same footprint

Tearing off the old deck and rebuilding it the same size is not a repair in most of these sources. Fairfax County says that “before building a new or replacing an existing deck, building permits are required.” Truckee says plans are normally required for deck replacement, including a site plan and foundation and framing plans. Dana Point requires a scaled site plan, framing plan, sections, structural details, and calculations for a non-exempt deck permit.

Chicago is the notable exception: repairing or replacing an entire deck or stair system in kind does not need a permit if it is no more than 6 feet above the ground and has a landing area of 50 square feet or less. Bigger or taller Chicago decks are back in permit territory.

If you are changing the size, shape, or height, you are building a new deck. Issaquah asks for setbacks and impervious surface calculations whenever the size of the deck changes. Our guide to deck permits by height, size, and attachment covers new decks in detail, and the Chicago porch, shed, and fence guide covers that city’s porch rules.

When location changes the answer

Even a like-for-like repair can need a permit because of where the deck sits:

Fire and coastal zones: Dana Point requires permits for repairs and like-for-like replacements in a Very High Fire Hazard Severity Zone, a coastal flood plain, or on a coastal bluff, regardless of size or height.
Critical areas and slopes: Edmonds says its exemptions do not apply on property designated as an earth subsidence and landslide hazard area or a critical area.
Flood zones: repair spending can count toward substantial improvement rules. See flood zone remodels and the 50% rule.
Historic properties: Chicago’s exemptions may not apply to designated or proposed Chicago Landmarks. See certificate of appropriateness vs. building permit.
HOAs: Blaine, Spring Lake Park, and Montgomery County all note that they do not enforce HOA or deed restrictions, so a new color or composite board may still need association approval. See HOA approval vs. city building permit.

Low decks and freestanding platforms

Many codes exempt low decks entirely, which also covers repairs to them. Oregon exempts building a porch or deck where the floor is not more than 30 inches above adjacent grade at any point. Minneapolis exempts construction, replacement, and repair of decks, platforms, and stoops that are freestanding and less than 30 inches high, are not attached to a structure with frost footings, and do not serve the main entrance (City of Minneapolis: Work Exempt from Permit). Dana Point says freestanding residential decks under 30 inches are normally exempt. Montgomery County, Maryland, is stricter: it requires a building permit for all decks supported by footings, regardless of height (Montgomery County DPS: Residential Decks Permit Process).

Notice the extra conditions. Being attached to the house, having a door that opens onto the deck, or serving the main entrance can take a low deck out of the exemption in Blaine, Spring Lake Park, Minneapolis, and Dana Point.

What a deck repair permit usually involves

A repair permit is usually lighter than a new-deck permit, but not paperwork-free.

Fees (examples, not averages): Blaine lists $76 for decking or guardrail repair/replacement and $151 for a new deck. Other cities set their own fees; see how building permit fees work.
Drawings: Issaquah’s deck plans include a dimensioned floor plan, framing plan, stair, handrail, guardrail, and foundation details. For structural repairs, expect to show member sizes, spacing, and connections.
Inspections: Blaine lists footing/ledger, underfloor framing (when there is less than 48 inches of clear space under the joists), and final inspections. Have your permit and approved plans on site.
Who applies: Montgomery County lets homeowners apply for a restore/repair permit in their own name, but a contractor must have a Maryland Home Improvement Commission license to obtain a permit. See who pulls the building permit.
Review time: Montgomery County says it is committed to completing code reviews within 17 days for adequately prepared restore/repair applications. That is one county’s published goal, not a national timeline.

Our inspection prep guide walks through getting ready for each visit.

Repairing a damaged deck: how a restore/repair permit works

Montgomery County, Maryland shows how a repair-only permit differs from a new-deck permit (Montgomery County restore/repair permit process):

Scope: a restore/repair permit covers reconstructing, restoring, or replacing part of an existing structure for maintenance or to correct damage, not complete or substantial replacement.
Storm or fire damage: returning a structure to “pre-damage condition” requires at least a restore/repair or other building permit, and trade permits may apply.
Speed: eligible applications can go through the Walk-Through program, sometimes giving a permit in a few hours.
Who applies: homeowners may apply in their own name, but if a contractor does the work, the county strongly suggests listing the contractor as the responsible party.
Inspections: request at least 24 hours before you need them, and keep the permit on site until the job is complete.

Source: Montgomery County restore/repair permit process.

Building a new deck or a larger one is covered in our new deck permit guide (height, size, attachment).

Common questions about deck repair permits

Can I replace rotten deck boards without a permit?

In many places, yes, if you are replacing boards with the same material and not touching the frame. Carroll County, Issaquah, Chicago (in kind), Edmonds, and Berkeley all say so. Truckee caps it at 66 square feet and St. Louis County at 50% of the decking. Blaine and Spring Lake Park require a permit for decking repair.

Do I need a permit to replace a deck railing?

Often yes, especially on a deck more than 30 inches above grade. Carroll County, Issaquah, and Blaine require one. Small partial repairs are exempt in Chicago (pickets in kind), Edmonds (intermediate rails), Berkeley (component repairs), Truckee (up to 33 lineal feet), and St. Louis County (up to 50%).

My deck was damaged in a storm. Can I fix it first?

Make it safe first, then ask. St. Louis County requires a building permit to repair a structure damaged by termites, fire, wind, flood, or earthquake, regardless of the extent of the damage. Montgomery County says returning a damaged home to “pre-damage condition” needs at least a restore/repair permit. Our guide to emergency repair permits after a leak or storm explains how cities handle urgent work.

What if the deck was repaired or rebuilt without a permit?

Dana Point treats work started without permits as “work without permits” subject to investigation fees, and it does not approve after-the-fact projects over the counter. See after-the-fact permits and selling a house with unpermitted work for how to clean it up.

Can I add a hot tub while I am repairing the deck?

Treat that as a new design, not a repair. Blaine requires structurally engineered plans when a deck supports a hot tub or spa, and Fairfax County’s typical deck details are not approved for hot tubs. Montgomery County notes that an electrical permit may be needed for hot tubs and stair lighting. See hot tub and spa permits.

Do I need a permit to fix a deck after a storm?

Often yes for structural parts. Montgomery County says returning a damaged structure to pre-damage condition requires at least a restore/repair or other building permit.

Should my contractor or I pull the deck repair permit?

Either may apply in many places. Montgomery County lets homeowners apply in their own name but strongly suggests listing the contractor as responsible if one does the work.

Checklist before you repair a deck

Name the parts: boards only, railing, stairs, or frame (joists, beams, posts, ledger, footings).
Measure the height: many rules turn on 30 inches above grade, measured near the deck edge.
Count the amount: square feet of boards, lineal feet of railing, or the percentage of each, if your city uses a threshold.
Decide on materials: same wood in kind, or a switch to composite or PVC that may need a permit and a listed product.
Check location triggers: fire zones, coastal or flood areas, slopes, historic districts, and HOA rules.
Look underneath: rot, corroded hardware, a loose ledger, or a wobbly guard post means a bigger, permitted repair.
Find your city’s exemption list and call the building department if your job does not match it word for word.
Pull any required permit before you start, and keep the final inspection record with your house papers.

If you would rather replace an aging deck with something at ground level, compare our guides to concrete and paver patio permits and porch permits.

Last checked: October 31, 2026.

Official sources

Related PermitCove guides: deck permits for new decks, stair replacement, and emergency repair permits.

Edited by Ahmed Khalifa, founder of PermitCove. Sources are linked inline; see our Editorial Policy.

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