Fees
Estimated city fees
Baseline for a simple permitted addition: $500–$1,800+ estimated city fees for a permitted residential addition in Nashville. Fees vary by project valuation, and trade permits are billed separately
| Fee | Amount | Notes |
|---|---|---|
| Building permit (valuation-based) | $500–$1,800+ (estimated range for typical room addition) | Metro Nashville permit fees are based on declared project valuation per the Codes Administration fee schedule. Verify current amounts at nashville.gov/codes before submitting. |
| Plan review fee | Charged at submittal based on scope | Nashville charges a plan review fee at application submittal. Residential addition review is included in the base fee structure. |
| Mechanical permit | $100–$350 (estimated) | Required for HVAC extensions or new equipment. |
| Electrical permit | $100–$400 (estimated) | Required for new circuits, panels, or service changes. |
| Plumbing permit | $100–$350 (estimated) | Required for any new bathroom or wet areas in the addition. |
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Conditions
The rules that apply
- A building permit is required for any addition that increases the enclosed floor area or structural footprint of a residential structure in Nashville-Davidson County.
- Metro Nashville Codes Administration processes residential addition permits through the Nashville Accela Citizen Access portal.
- Additions that include a bathroom, laundry room, or wet area require a plumbing permit in addition to the building permit.
- Additions that extend HVAC ductwork or add mechanical equipment require a mechanical permit.
- New electrical circuits, subpanels, or service upgrades require a separate electrical permit.
- Additions must comply with the Metro Nashville Zoning Code. Setbacks, lot coverage, height limits, and floor area standards vary by zone district.
- Tennessee energy code compliance (2018 IECC with Tennessee amendments) is required for all conditioned additions.
- Properties in Nashville's Urban Design Overlay (UDO) districts or historic landmark zones may require additional design review or a Certificate of Appropriateness from the Metro Historic Zoning Commission.
- Additions in FEMA-mapped Special Flood Hazard Areas require a Metro floodplain development permit.
Documents
What you'll need to file
- Building permit application submitted through the Nashville Accela Citizen Access portal.
- Site plan showing lot dimensions, property lines, setbacks, existing structures, and the proposed addition footprint.
- Floor plans for all affected levels showing existing and proposed layout with room dimensions and openings.
- Exterior elevations showing existing and proposed building height and materials.
- Foundation and framing details appropriate to the scope.
- Tennessee energy code compliance documentation.
- Structural calculations or engineer-stamped drawings for non-prescriptive spans.
- Historic Zoning Commission Certificate of Appropriateness if required by overlay.
- Trade permit applications for mechanical, electrical, and plumbing work.
Process
How the permit process works
Each step must finish before the next one starts.
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Check zoning and overlay requirements Use Nashville's Metro maps or the zoning portal to check setbacks, lot coverage, height limits, and any Urban Design Overlay or historic landmark requirements for your parcel. Nashville is updating its zoning often because of rapid growth, so verify current standards.
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Determine if historic or overlay review is required Properties in Nashville's historic landmark zones or with local overlay designations may require a Certificate of Appropriateness from the Metro Historic Zoning Commission. Confirm before preparing construction drawings.
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Hire a designer or architect Residential additions require plans prepared by a Tennessee-licensed architect or residential designer. Structural elements require engineer-stamped drawings.
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Submit through the Nashville Accela portal Log into the Citizen Access portal at nashville.gov/codes, start a new residential addition permit application, upload all documents, and pay the plan review fee.
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Respond to plan review corrections Codes Administration reviewers check zoning, structural details, energy code, and life safety. Respond to correction notices with updated plans and resubmit.
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Pay remaining fees and receive the permit Once approved, pay the balance, download the permit, and post it on site before construction begins.
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Schedule inspections at required milestones Request inspections at the required stages, typically foundation, framing, insulation, and final. Trade inspections have their own milestones. Do not cover work before it is inspected.
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Pass final inspection and close the permit After all inspections pass, the permit is closed. Retain documentation for insurance, refinancing, and resale.
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Provenance
Code basis & official sources
Last verified 2026-05-07.
2018 International Residential Code (IRC) as adopted by Tennessee with local Metro Nashville amendments. Tennessee Energy Code (2018 IECC with Tennessee amendments) for energy compliance. Metro Nashville Zoning Code for land use and dimensional standards.
Residential permit page: https://permits.nashville.gov/CitizenAccess/
If you skip the permit
- Metro Codes Administration can issue a stop-work order and require removal of unpermitted work.
- Retroactive permits require opening completed walls and framing for inspection.
- Home inspectors and mortgage lenders flag unpermitted additions, which can delay or block a sale.
- Insurance may deny claims related to unpermitted living areas.
- Unpermitted square footage may not be counted in the appraised value of the home.
- Code violations in Nashville result in civil penalties and can complicate future permits on the same parcel.
FAQ
Common Nashville addition permit questions
Do I need a permit to add a room to my house in Nashville?
Yes, always. Any addition that increases the enclosed living area of a Nashville-Davidson County residential building requires a building permit from Metro Codes Administration.
How much does an addition permit cost in Nashville?
Nashville permit fees are based on project valuation. A typical room addition runs $500–$1,800+ in city fees. Trade permits (electrical, plumbing, mechanical) are billed separately. Check current amounts at nashville.gov/codes.
How long does Nashville permit review take for a room addition?
Standard residential addition review typically takes 2–5 weeks per review cycle. A whole project, including corrections, construction, and inspections, commonly takes 2–4 months. Nashville's high construction volume may extend review times.
Does my Nashville addition need to comply with Tennessee Energy Code?
Yes. All conditioned additions in Nashville must comply with the Tennessee Energy Code, which is based on the 2018 IECC with Tennessee amendments. Requirements vary by climate zone, including insulation levels and window efficiency standards.
Does Nashville have any special rules for additions in historic neighborhoods?
Yes. Properties in Nashville's locally designated historic landmark zones or overlay districts need a Certificate of Appropriateness from the Metro Historic Zoning Commission before a building permit is issued. The review looks at whether the design fits the historic character of the area.
Do I need separate permits for electrical and plumbing in my Nashville addition?
Yes. Electrical work requires a separate electrical permit. Plumbing requires a plumbing permit. HVAC extensions require a mechanical permit. All are filed through Nashville's Accela portal alongside the main building permit.
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Disclaimer: Informational only, not legal advice. Rules change. verify with Nashville permitting staff before you build.