Deck building in Cary, NC

Cary wants a permit for every deck, however small. This guide covers what the town asks you to submit, what the permit costs, how long review takes, which inspections to expect and where a deck may sit on a Cary lot. For national prices, the state deck code and hiring in general, see the Triangle guide to deck building.

Cary deck permits: what you need before you build

Cary requires a building permit for all decks, regardless of size or height (Cary permit FAQ). The town's deck handout, revised in September 2025, ties that rule to the state residential code and says it holds wherever the deck sits on the lot (Cary deck handout). A freestanding platform at the back of the yard needs one just as much as a deck off the kitchen.

Small repairs are the exception. Cary does not ask for a permit to replace pickets, railings or treads (Cary permit FAQ), and state law also lets you swap out worn decking boards without one, for work costing $40,000 or less (G.S. 160D-1110). Once the work touches the posts, beams, joists or footings that carry the load, a permit is needed again (G.S. 160D-1110).

The duty sits with you as the owner. A contractor can act as your agent and pick up the permit, but Cary says it is the homeowner's job to make sure the right permits are obtained (Cary home projects). Ask to see the permit before anyone digs.

What to send Cary

1. A plot plan. It has to show the outline of the house, the deck, porches, easements and buffers, with the distance to each property line at its closest point (Cary deck handout). You may use an existing survey or hand-draw a site plan to scale (Cary deck handout). Cary may also require an as-built survey to check where the deck was built, and requires one if it comes within 5 feet of a setback, easement or buffer; its FAQ says one is generally required when a footprint changes, decks included (Cary permit FAQ). Ask when you apply.
2. Construction drawings. Draw them to scale, at 1/4 inch to 1 foot if you can, and give the thickness, width, depth and location of each footing (Cary deck handout). The drawings should also show the girders, joists, spans, the connection to the house and the decking (Cary deck handout). Cary's online Deck Design Assistant takes you through a typical deck one step at a time (Cary Deck Design Assistant).
3. Engineering, if the deck needs it. A spa or hot tub resting on the deck's wood floor system requires a design by a North Carolina licensed design professional (Cary deck handout). The handout lists other cases that need one too, including point loads that are not carried down to a footing and decks hung from a cantilevered floor (Cary deck handout).

Two outlets on every Cary deck

Cary requires at least one electrical outlet inside the perimeter of the deck and a second one you can reach while standing on the ground, two in all (Cary deck handout). Outlets the house already has may count (Cary deck handout). If new ones are needed, they bring an electrical trade fee (Cary fee schedule) and inspection (Cary deck handout). Unless you do the wiring yourself as the owner, it has to be done by a licensed electrician, whatever the size of the job (Cary contractor licensing).

The permit fee

Under Cary's FY 2027 fee schedule, a residential deck building permit costs $0.30 per square foot, with a $125 minimum (Cary fee schedule). Trade fees, such as an electrical permit for new outlets, are charged on top (Cary fee schedule). Working it through, any deck under about 417 square feet pays the $125 minimum:

The schedule does not say whether stairs and landings count toward the area, so ask when you apply. Mistakes cost more: starting work without a permit doubles the fee, a re-inspection fee of $125 applies when work isn't ready or problems recur, and a plan re-review is a flat $200 covering all trades (Cary fee schedule). The national permit estimates you may see online, $230 to $500 from Angi (Angi) or $50 to $150 from HomeGuide (HomeGuide), do not match Cary's schedule.

How long review takes

Decks are on Cary's list of projects that can book a scheduled SPOT review, which is usually done in 1 to 4 business days and costs nothing extra (Cary SPOT review). The list may limit this to projects under 500 square feet, and a plans examiner can rule a project too complex for SPOT (Cary SPOT review). The town's regular review cycle runs about seven business days (Cary permit FAQ). State law caps the wait for the first review of a building permit at 15 business days after the plans go in (G.S. 160D-1110).

Inspections

Cary's handout describes the usual inspections for a deck, and the town sets the exact list when it issues the permit (Cary deck handout):

• Footing, for new footings: after the holes are dug and before the concrete is placed.
• Foundation or post placement.
• Open floor, which is optional.
• Framing, needed if any framing will be hidden by the time of the final.
• Electrical, if new outlets are wired.
• Final, once all the work, electrical included, has been completed, inspected and approved.

Every final inspection in Cary has to be called in by phone (Cary inspections). A permit stays active for six months with no activity, or for one year after the last inspection (Cary inspections). If it expires, picking the project back up means a new permit at double the fee (Cary inspections). Once everything passes, Cary will issue a certificate of compliance on request, which the town says can help when you sell (Cary home projects).

Where a deck may sit on a Cary lot

Cary's Land Development Ordinance controls how close a deck can come to your lot lines, streams and buffers. Ordinances get amended, so confirm the numbers below with Cary Planning before you draw your plot plan.

Setbacks

An uncovered deck may project up to 3 feet into a required setback, but no closer than 5 feet to the property line or a buffer (Cary LDO, ch. 6). A roof over the deck may not extend into the setback at all (Cary LDO, ch. 6). The base rear setback depends on your zoning district (Cary LDO, ch. 6):

Many Cary neighborhoods set their own lines. If setbacks are shown on the recorded plat, the plat setbacks control (Cary LDO, ch. 6). Where deeper setbacks appear only on a neighborhood's development plan, the HOA's written approval can bring them down to the zoning minimum (Cary LDO, ch. 6).

If a deck ends up slightly inside a setback because of a construction error, or because the lot is narrow, steep or oddly shaped, Cary's Planning Director may approve an encroachment of up to 15% of the required setback (Cary LDO, ch. 3). Anything beyond that needs a variance (Cary LDO, ch. 3).

A freestanding deck appears to fall under the ordinance's detached-structure row, which sets it 5 feet from side and rear lines (Cary LDO, ch. 6). Confirm with Cary Planning before you draw the plot plan.

Impervious surface

Your lot may have a limit on impervious surface, which depends on the development plan for your subdivision (Cary residential lots). The recorded plat is on file with the Wake or Chatham County Register of Deeds (Cary residential lots). Cary's ordinance does not count slatted decks as impervious surface (Cary LDO, ch. 12), which helps on a lot that is close to its cap.

Stream buffers

Cary is stricter than the state near streams. On top of the state's 50-foot buffer, Cary adds a 50-foot Urban Transition Buffer, or UTB, for a combined 100 feet along every intermittent and perennial stream mapped by the USGS in the Neuse and Jordan Lake watersheds (Cary stream buffers). Single-family lots platted before July 27, 2000 are exempt from the UTB (Cary stream buffers).

A wooden slatted deck inside the UTB can be allowed, but never automatically. One at least 8 feet high with no vegetation removed is listed as "Allowable"; one lower than 8 feet, or one that removes vegetation, is "Allowable with Mitigation" (Cary LDO 14.6). Either way, the use requires written authorization from Cary (Cary LDO 14.6). On lots created after July 22, 1997 in the Neuse River Basin, or after July 27, 2000 in the Jordan Lake Protected Watershed, the house must stay 10 feet back from the buffer and accessory structures 5 feet (Cary LDO, ch. 6). Ask Cary Planning which applies to an attached deck.

Floodplains and erosion control

Any work in a floodplain needs a Cary floodplain development permit, even when no building permit is required (Cary residential lots). Erosion control measures are required on residential projects however little ground is disturbed (Cary residential lots).

Historic districts

In a Cary historic district or on a landmark property, altering, adding to or removing an existing deck counts as minor work, which needs a minor Certificate of Appropriateness (Cary LDO, ch. 3). A brand-new deck is not on that minor-works list, so ask Cary Planning what review a new one needs.

Building a deck that passes Cary's inspections

Cary enforces only the state-adopted building code in force when the permit is issued, and that is the 2018 North Carolina Residential Code (Cary building codes). Its handout and Deck Design Assistant turn the code into specific steps. The state rules on guards, stairs and treated wood are in the Triangle guide; these are the points Cary spells out for itself.

• Footings. The bottom of every footing has to be at least 12 inches below grade (Cary Deck Design Assistant). Footing size depends on how much deck area each footing carries: Cary's chart runs from an 8 by 16 by 6 inch poured footing for up to 36 square feet to a 24 by 24 by 8 inch footing for up to 150 square feet (Cary Deck Design Assistant). You cannot interpolate between sizes; use the next larger size on the chart (Cary Deck Design Assistant).
• The house connection. On a typical house with siding, Cary's guide has you remove the siding, flash, and bolt a treated band to the house band with 5/8-inch galvanized through-bolts every 20 inches, or every 42 inches if the joists span 8 feet or less (Cary Deck Design Assistant). On brick veneer, the bolts go through the brick at 16 inches (Cary Deck Design Assistant). Holes made by bolts or structural screws in the band can only be protected by counter flashing the top of the deck band (Cary deck handout).
• Bracing. A deck attached to the house needs bracing once it is more than 4 feet above grade, and a freestanding deck needs bracing in each direction once it is more than 30 inches above grade (Cary deck handout).
• Guards and handrails. Cary's list of common building problems includes fall protection (a guardrail at least 36 inches high), handrail height of 34 to 38 inches, and handrails wherever there are four or more risers (Cary common issues).

Thinking of a roof over the deck? A June 2026 state ruling found that Appendix M has no prescriptive roof load or wind uplift criteria for porch roof-support posts (NC Fire Marshal on deck covers), and Cary does not let a roof reach into a setback (Cary LDO, ch. 6). Talk to Cary's inspections staff about a cover before your drawings are final.

What a deck costs in Cary

No source we checked gave a deck price for Cary itself, so Cary homeowners are left with national averages. HomeAdvisor puts a new deck at $4,000 to $16,000 on average (HomeAdvisor), and the Triangle guide breaks national prices down by size, material and height. Get written quotes from builders who work in Cary and know its rules.

Some costs are specific to building in Cary:

• The building permit: $125 for most decks, and $0.30 per square foot above about 417 square feet (Cary fee schedule).
• Electrical trade fees on top of the building permit if new outlets are needed (Cary fee schedule), plus an electrician's labor unless you wire them yourself.
• An as-built survey, which Cary generally requires when a footprint changes, decks included, and requires whenever the deck comes within 5 feet of a setback, easement or buffer (Cary permit FAQ).
• An engineer's or architect's design for a deck that will hold a hot tub (Cary deck handout).
• Penalties: double fees for starting without a permit (Cary fee schedule) or for restarting after a permit expires (Cary inspections), $125 for a re-inspection when work isn't ready or problems recur, and $200 for a plan re-review (Cary fee schedule).

Cary's schedule lists residential trade permits, electrical included, at $0.15 per square foot with a $125 minimum (Cary fee schedule); ask how that applies to deck outlets.

Licenses and owner-built decks in Cary

Cary's contractor licensing page is direct about it: general contractors on projects under $40,000 do not need a license (Cary contractor licensing). That matches state law, which sets the line at $40,000 (G.S. 87-1). Subcontractors are another matter. They need licenses whatever their work costs, and if your general contractor is unlicensed, hiring the electrician falls to you (Cary contractor licensing).

Cary also lets you be your own builder. The owner of a property can do their own building and electrical work without a license, provided the house stays their primary residence for at least 12 months after the work is done (Cary permit FAQ). In that case you apply for the permit and call in the inspections yourself (Cary permit FAQ).

To look up a general contractor, use the state board's license search, which works by name, license number or county (NC contractor board). The board can act on unlicensed contracting only on projects of $40,000 or more, and it cannot order repairs or refunds (NC contractor board), so on a Cary deck the contract does most of the protecting.

Hiring a deck builder in Cary

Cary's advice to homeowners is to get a written contract listing exactly what will be done, a payment schedule, a timetable with a completion date, and the permit requirements (Cary home projects). Don't pay in full until the job is complete, every inspection is approved and you are satisfied (Cary home projects). Collect at least three written estimates (NC Attorney General).

Questions worth asking a Cary deck builder:

• Will you book Cary's SPOT review, and who draws the plot plan and construction drawings?
• Will Cary want an as-built survey for this deck, and is it in your price?
• Which setback, plat line or stream buffer applies to my lot, and how close will the deck come to it?
• Do my existing outlets meet Cary's two-outlet rule, and if not, who wires the new ones and pays the electrical fee?
• Who calls in the final inspection, and will I get the certificate of compliance?
• Does my HOA need to approve the deck before the permit goes in?

The red flags, cancellation rights and lien waiver steps in the Triangle guide to deck building apply in Cary too. One matters most here: be wary of a builder who asks you to take out the permits and arrange the inspections yourself (NC Attorney General).