Do I need a permit for addition or structural alteration in Cary?
Yes. In North Carolina, addition or structural alteration generally requires a permit, and Cary is no exception.
An addition or structural alteration always requires a permit and cannot use the NCGS 160D-1110 minor-work exemption because it involves structural work. Expansions may trigger zoning, setback, or stormwater review in addition to the building permit; confirm requirements with your local department early. Additions and interior or exterior wall demolition or addition require a building permit from the Town of Cary, and any change to a building's footprint requires a proposed plot plan and an as-built survey. Cary offers a SPOT (same-day remote) review for additions less than 500 square feet and interior alterations less than 1,500 square feet; larger or more complex projects go through the regular review cycle, which the Town lists as roughly one to two weeks for one- and two-family homes. Additional site and environmental approvals (floodplain, stream buffer impacts, erosion control for land disturbance) may be required in addition to the building permit. Wake County's own permitting office is Wake County Permits and Inspections. It issues permits for the unincorporated county, and in North Carolina the county is often the building authority even inside city limits, so confirm which applies to your address. Erosion control here depends on which town you are in. Wake County administers erosion control for all unincorporated areas plus six municipalities under interlocal agreements: Garner, Knightdale, Morrisville, Wendell, Rolesville and Zebulon. If you are in one of those six, or in the unincorporated county, your plan goes to Wake County. Raleigh, Cary, Apex and the other Wake towns run their own programs. An addition combined with grading, access and material storage is the other common way a residential job reaches an acre of disturbance. The trigger is size, not cost: Wake County reviews construction plans for land development over one acre of disturbance. Ordinary single-family work is normally well under that, so this bites on large lots, big site regrading, or a project combined with substantial clearing.
Documents you may need
- Permit applicationrequired
- Construction drawings / plansrequired
- Site plan with setbacksrequired
- Structural / engineering details where applicableLikely required
- Residential building permit application through the Town of Cary electronic plan review portalrequired
- Complete building plans and a plot plan in a readable scalerequired
- As-built survey when construction is within 5 feet of a setback, easement, or bufferSometimes required
- Contractor names, addresses, and North Carolina license numbersrequired
- Erosion and sedimentation control plan where disturbance exceeds one acreSometimes required
Possible inspections
- Footing and foundation inspection
- Framing, plus electrical / plumbing / mechanical rough-in
- Insulation inspection
- Final inspection
- Framing inspection
- Trade rough-in inspections (electrical, plumbing, mechanical) where applicable
- Final building inspection
Frequently asked questions
- Do I need a permit for addition or structural alteration in Cary?
- Yes. In North Carolina, addition or structural alteration generally requires a permit, and Cary is no exception. An addition or structural alteration always requires a permit and cannot use the NCGS 160D-1110 minor-work exemption because it involves structural work. Expansions may trigger zoning, setback, or stormwater review in addition to the building permit; confirm requirements with your local department early. Additions and interior or exterior wall demolition or addition require a building permit from the Town of Cary, and any change to a building's footprint requires a proposed plot plan and an as-built survey. Cary offers a SPOT (same-day remote) review for additions less than 500 square feet and interior alterations less than 1,500 square feet; larger or more complex projects go through the regular review cycle, which the Town lists as roughly one to two weeks for one- and two-family homes. Additional site and environmental approvals (floodplain, stream buffer impacts, erosion control for land disturbance) may be required in addition to the building permit. Wake County's own permitting office is Wake County Permits and Inspections. It issues permits for the unincorporated county, and in North Carolina the county is often the building authority even inside city limits, so confirm which applies to your address. Erosion control here depends on which town you are in. Wake County administers erosion control for all unincorporated areas plus six municipalities under interlocal agreements: Garner, Knightdale, Morrisville, Wendell, Rolesville and Zebulon. If you are in one of those six, or in the unincorporated county, your plan goes to Wake County. Raleigh, Cary, Apex and the other Wake towns run their own programs. An addition combined with grading, access and material storage is the other common way a residential job reaches an acre of disturbance. The trigger is size, not cost: Wake County reviews construction plans for land development over one acre of disturbance. Ordinary single-family work is normally well under that, so this bites on large lots, big site regrading, or a project combined with substantial clearing.
- Who issues the permit in Cary?
- The local building department for Cary handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
- How do I find out the exact requirements for my project?
- Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.
PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.