Do I need a permit for a new roof or a deck in Nashville?

A deck, yes — Metro treats it as an accessory structure, so a permit is required to build or add one. A roof, it depends: repairs up to 33% of the roof area are "normal maintenance" and need no permit, but replacing or repairing more than 33% does. When in doubt, the one-third line is the one to measure against.

Do I need a permit to repair storm damage in Nashville?

Two different answers. Metro Codes does not require a permit for demolition and clean-up — removing wet drywall, carpet, and doors. But a building permit IS required before repairs begin, including before you reinstall drywall or fix damaged electrical, plumbing, or HVAC.

Can a homeowner pull their own building permit?

An owner-occupant can (a "self-permit"), but there are strings: you take on total code-compliance responsibility by notarized affidavit, and you give up the protection of the contractor's $10,000/$40,000 permit bond. Metro's ePermits online system also won't create an account for homeowners at all — it's for licensed contractors only, so owners apply in person.

What's the difference between a conservation overlay and a historic overlay?

A Neighborhood Conservation overlay (NCZO) reviews new construction, additions, demolition, and relocation only. A Historic Preservation overlay (HPZO) also reviews exterior alterations — siding, fences, windows. Either way you need a Preservation Permit, which is free and must be issued before the building permit. Two houses a mile apart can sit under different regimes.

When does a Nashville project need a grading permit?

Roughly: when you move more than 100 cubic yards of material or disturb more than 10,000 sq ft (plus depth and slope conditions). All work inside a designated floodplain needs one regardless. And if you start grading before the permit issues, the fee triples — so it's not a corner to cut.

Do I need a state license for a small remodel in Davidson County?

Yes, likely. Davidson County is one of nine Tennessee counties where a state Home Improvement license is required for jobs from $3,000 to $24,999 — "regardless of whether a permit is needed." At $25,000 and up, the full state contractor's license is required before you can even bid.

Did Nashville tighten its building codes after the 2020 tornado?

There's no evidence it did — and that's worth saying, because the assumption is common. What's documented is process, not a rule change: no permit is needed for storm demolition and clean-up, but one is required before repairs begin, and the Historic Zoning Commission commits to expediting Preservation Permits after a disaster.

Is this page legal or permitting advice?

No. It's a maintained summary with sources, last verified July 11, 2026. Ordinances shift, especially the stormwater and STRP rules. Before you commit money to a project, confirm the current rule with the relevant Metro department — the paperwork follows the jurisdiction, not this page.

Guide · last verified July 11, 2026

The permits Nashville homeowners don’t know they need, one table.

On March 3, 2020, an EF-3 tornado tore a 60-mile path across Middle Tennessee — the longest since records began in 1950 — through North Nashville, Germantown, and East Nashville. Two damaged homes a mile apart, one in Germantown and one in Lockeland Springs, faced different design-review rules to rebuild the same porch. That is Metro Nashville permitting in one sentence: one city, several rule systems that genuinely diverge.

Below is what a contractor should know before bidding — the numeric thresholds that decide whether a job needs a permit, a plan, or a license, each with its primary source and our verification status. The most-repeated assumption — that Metro tightened its codes after the tornado — doesn’t survive a check: what changed was process, not the code.

This is general information, not legal or permitting advice. Confirm any project against the current Metro ordinance and the relevant department before you commit money to it.

The threshold table

Each row states the rule as of the last-verified date, with its source and our verification status — because a guide that labels its own confidence is worth more than one that pretends.

Topic	The rule	Detail	Source · status
Historic overlay design review — Metro Historic Zoning Commission (MHZC)	In a historic zoning overlay, a Preservation Permit must be issued before the building permit. There is no fee for it. Routine projects staff can approve administratively generally issue within four days of a complete application; infill, large additions, corner-lot new construction, and demolition of historic primary buildings go to the full Commission.	Two overlay types diverge: Neighborhood Conservation (NCZO) reviews only new construction, additions, demolition, and relocation. Historic Preservation (HPZO) also reviews exterior alterations — siding, fences, windows. Work not visible from the public right-of-way is generally not reviewed.	nashville.gov — MHZC, Apply for a Preservation Permit Verified
Which neighborhoods carry which overlay	Germantown, Edgefield, Marathon Village, Second Avenue, Broadway, and Downtown are Historic Preservation overlays (HPZO). Lockeland Springs–East End, Eastwood, Greenwood, Inglewood Place, Salemtown, Belmont-Hillsboro, and Hillsboro-West End (among others) are Neighborhood Conservation overlays (NCZO).	The 2020 tornado's path crossed both regimes — Germantown (HPZO, where exterior repairs are reviewed) and Lockeland Springs/Eastwood (NCZO, where repairs like siding are not, but additions and demolition are). Edgefield was Nashville's first historic district (1978). Confirm any property via the Metro parcel viewer.	nashville.gov — MHZC districts and design guidelines Verified
Grading permit — Metro Water Services Stormwater Division	A grading permit is required for land-disturbing activity unless the project stays under ALL exemption criteria — the practical residential lines: no more than 100 cubic yards of material moved and no more than 10,000 sq ft of land exposed (plus depth/slope/stabilization conditions).	All development activity within a designated floodplain requires a grading permit — exemptions void. If a project needs both, the grading permit must be issued first; Codes cannot issue the building permit until it is. Retaining walls under 6 ft and single-family footings are treated as finish grading (outside floodplain + buffer).	nashville.gov — MWS, Who Needs a Grading Permit Verified
Grading before the permit issues	Start the work before the grading permit issues and the permit fee is tripled.	Stated on the current MWS Development Fee Schedule (rev. 03/10/2026): the grading-permit fee is tripled if work started prior to permit issuance.	nashville.gov — MWS Development Fee Schedule (2026) Verified
Regulated Residential Infill (stormwater) — ordinance BL2014-910	Any residential project adding 800–15,000 sq ft of net new impervious area (roof, driveway, patio) in an existing neighborhood must capture the first inch of rainfall runoff from the added area (rain garden, dry well, cistern, permeable pavers). MWS must approve the plan before the building permit issues.	Three tiers: 800–2,500 sq ft added and lot imperviousness over 30% (Tier 1); 2,500–8,000 sq ft (Tier 2); 8,000–15,000 sq ft with a PE-certified design (Tier 3). The maintenance obligation is recorded as a covenant that runs with the land. Excluded: under 800 sq ft, over 15,000, or lots over 40,000 sq ft.	legisarchive.nashville.gov — Ordinance BL2014-910 Verified
Residential building permit — Metro Codes	A permit is required for: new buildings and additions; accessory structures (garages, decks, porches, sheds) of 100 sq ft or more; pools (with a 48-inch barrier); converting a garage, basement, or attic to living space; siding, roofing, fireplaces, or solar; structural work beyond normal maintenance; and demolition.	Construction plans are required only for homes over 5,000 sq ft or over 3 stories; a site plan is required either way.	nashville.gov — Codes, Residential Building Permits Verified
The Self-Permit trap — who really pulls it	An owner-occupant may pull their own permit, but assumes total code-compliance responsibility (notarized affidavit) and loses the protection of the contractor's $10,000 / $40,000 permit bond.	Self-permit certifications include: not pulling it on a contractor's behalf, no other residence permit within 2 years, and not building for resale at $25,000 or more. Metro's ePermits online system will not create an account for homeowners at all — it is for registered licensed contractors only; owners apply in person.	nashville.gov — Codes, Self-Permit Affidavit + ePermits Verified
State contractor's license — TN Board for Licensing Contractors	A Tennessee contractor's license is required BEFORE bidding (offering any price) on projects of $25,000 or more, materials plus labor. Subcontractors in electrical, mechanical, plumbing, HVAC, and roofing need it at the same $25,000 line; masonry at $100,000.	The limited residential option (BC-A/r) caps projects at $125,000. Issuance takes roughly 4–6 weeks — a legal bid cannot precede the license. Contracting without one is penalized under T.C.A. 62-6-120.	tn.gov — Board for Licensing Contractors Verified
Home Improvement license — Davidson County (T.C.A. 62-6-516)	For remodeling jobs from $3,000 to $24,999 on existing homes, Davidson County is one of nine Tennessee counties where the contractor must hold a state Home Improvement license — required regardless of whether a permit is needed.	It does not cover electrical, plumbing, or HVAC (separate trade licensing). At $25,000 and up, the full contractor's license applies instead. Other adopting counties include Rutherford, Robertson, Knox, Hamilton, and Shelby.	tn.gov — Home Improvement Licensing Requirements Verified
Short-term rental (STRP) — Metro Codes	No one may operate or advertise a residential property as a short-term rental without an STRP permit from Metro Codes, and the permit number must appear in every listing. Permits are non-transferable — they do not convey with a sale.	An owner-occupied permit requires the owner to permanently reside at the property and be a natural person; an LLC cannot hold one. Application requires notarized proof, proof taxes are paid, and written notice to adjacent owners. (Zoning eligibility by district was amended repeatedly and is not restated here — confirm with Metro Codes.)	nashville.gov — Codes, Short-Term Rentals permit types Verified
Disturbing one acre or more — the state layer	Clearing, grading, or excavation disturbing one acre or more also needs coverage under TDEC's Construction General Permit (a Notice of Coverage) before MWS will schedule the pre-construction meeting and issue the grading permit.	A state (TDEC) requirement layered on top of the Metro permit. Confirm the current edition of the stormwater manual chapter or the TDEC page before relying on the exact acreage line.	nashville.gov — Stormwater Management Manual (Vol. 1) Partially verified

Does this job need a permit?

The most-searched question a homeowner types before they call is simply whether their specific job needs a permit at all. Metro answers it project by project. Below is the plain read for the jobs that come up most, each traced to Metro Codes’ own list — the answer often turns on a single number, like the one-third-of-the-roof line.

The job	Permit?	What Metro Codes says
Re-roof or roof repair	Depends	Repairs up to 33% of the roof area count as normal maintenance — no permit. Replacing or repairing more than 33% of the roof needs one.
New siding	Permit	Installing siding is on the permit-required list, alongside roofing, fireplaces, and solar.
Deck, porch, carport, or patio cover	Permit	Treated as an accessory structure — a permit is required to build one or add to it.
Detached garage or storage building	Permit	Accessory structures, including portable storage buildings, need a permit at 100 sq ft or more.
Swimming pool (in- or above-ground)	Permit	All pools require a permit, plus a 48-inch barrier or fence.
Fireplace or solar panels	Permit	Both are named on the permit-required list.
Finish a basement, attic, or garage into living space	Permit	Converting an accessory area to habitable space requires a permit.
Remove a wall or alter load-bearing framing	Permit	Structural work beyond normal maintenance — moving partitions, replacing supporting walls, altering load-bearing timbers — needs a permit.
Paint, wallpaper, glaze windows, refinish floors	No permit	Explicitly listed as normal maintenance repair — no building permit.
Minor repairs to chimneys, stairs, porches, or underpinning	No permit	Also named as normal maintenance repair.
Electrical, plumbing, or gas/mechanical work	Trade permit	Metro Codes inspects Building, Electrical, Plumbing, Energy, and Gas/Mechanical work — trade work is permitted separately from the building permit.

Every row above is verified against Metro Codes’ Residential Building Permits page and the Building-Permit-Required list, last checked July 11, 2026. A water-heater swap is a common question, but Metro publishes no clean building-permit threshold for it — it falls under separate plumbing and gas/mechanical trade permitting — so we leave it off rather than guess a number.

Before you can pull it: the contractor lines

Out-of-county business license. A contractor based outside Davidson County needs a Metro business license once they do more than $100,000 (bid price) of work in the county in a tax year.
Permit bond. Pulling a permit requires a $10,000 bond — or a $40,000 bond for contracts and bids of $25,000 and over.

Source: Metro Codes — Permit Issuance Contractor Requirements (accessed July 11, 2026).

What this means if you’re the contractor

The same job can need a permit in one situation and sail through in another, and a homeowner is searching for exactly these answers before they decide who to call. A contractor whose website explains the grading line, the overlay-review split, or the self-permit trap — for the specific neighborhood the customer lives in — earns the call. That’s the kind of page we build; see contractor web design.

How current is this page?

Ordinances shift, especially the stormwater and short-term-rental rules. Every row above carries its verification status and the date we last checked it (July 11, 2026). Rows marked “partially verified” rest on a source we could reach but couldn’t fully pin to the current edition — we say so rather than rounding up to certainty.

Straight answers

Do I need a permit for a new roof or a deck in Nashville?
A deck, yes — Metro treats it as an accessory structure, so a permit is required to build or add one. A roof, it depends: repairs up to 33% of the roof area are "normal maintenance" and need no permit, but replacing or repairing more than 33% does. When in doubt, the one-third line is the one to measure against.
Do I need a permit to repair storm damage in Nashville?
Two different answers. Metro Codes does not require a permit for demolition and clean-up — removing wet drywall, carpet, and doors. But a building permit IS required before repairs begin, including before you reinstall drywall or fix damaged electrical, plumbing, or HVAC.
Can a homeowner pull their own building permit?
An owner-occupant can (a "self-permit"), but there are strings: you take on total code-compliance responsibility by notarized affidavit, and you give up the protection of the contractor's $10,000/$40,000 permit bond. Metro's ePermits online system also won't create an account for homeowners at all — it's for licensed contractors only, so owners apply in person.
What's the difference between a conservation overlay and a historic overlay?
A Neighborhood Conservation overlay (NCZO) reviews new construction, additions, demolition, and relocation only. A Historic Preservation overlay (HPZO) also reviews exterior alterations — siding, fences, windows. Either way you need a Preservation Permit, which is free and must be issued before the building permit. Two houses a mile apart can sit under different regimes.
When does a Nashville project need a grading permit?
Roughly: when you move more than 100 cubic yards of material or disturb more than 10,000 sq ft (plus depth and slope conditions). All work inside a designated floodplain needs one regardless. And if you start grading before the permit issues, the fee triples — so it's not a corner to cut.
Do I need a state license for a small remodel in Davidson County?
Yes, likely. Davidson County is one of nine Tennessee counties where a state Home Improvement license is required for jobs from $3,000 to $24,999 — "regardless of whether a permit is needed." At $25,000 and up, the full state contractor's license is required before you can even bid.
Did Nashville tighten its building codes after the 2020 tornado?
There's no evidence it did — and that's worth saying, because the assumption is common. What's documented is process, not a rule change: no permit is needed for storm demolition and clean-up, but one is required before repairs begin, and the Historic Zoning Commission commits to expediting Preservation Permits after a disaster.
Is this page legal or permitting advice?
No. It's a maintained summary with sources, last verified July 11, 2026. Ordinances shift, especially the stormwater and STRP rules. Before you commit money to a project, confirm the current rule with the relevant Metro department — the paperwork follows the jurisdiction, not this page.