What happens if you skip the permit (and you needed one)
- Stop-work order plus $500–$1,500 fine if the city inspector catches unpermitted work during or after installation; you'll also owe double the permit fee on the back-pull.
- Insurance claim denial if your homeowner's policy requires permitted work and a claim is filed before the retroactive permit is posted.
- Shelby County property transfer disclosure (TDS) now requires disclosure of unpermitted structural work; buyer discovery can kill a sale or force a price cut of 5-10%.
- Lender refinance block: if you later refinance, the lender's title search may flag unpermitted roofing and demand retroactive permit or structural certification before closing.
Collierville roof replacement permits — the key details
Collierville adopts the 2020 International Residential Code (IRC) and interprets it strictly on reroofing. The core rule is IRC R907.4: 'Where the existing roof covering is to be replaced, the new roof covering shall be applied over the existing roof covering without removal, except that where the existing roof covering is determined to be in such condition that the existing roof covering or its supporting members will not safely support the new roof covering, the existing roof covering shall be removed.' In plain English: you can overlay ONE layer if the deck is sound, but if you already have TWO layers underneath, you must tear to bare deck before installing a third. Collierville's Building Department (located within City Hall on Main Street, Collierville, TN) requires applicants to declare the number of existing layers on the permit form or via a pre-inspection photo. If the roofing contractor discovers a third layer during tear-off, work halts until the permit is amended and a deck inspection is scheduled. This rule exists because insurance underwriters and resale appraisers worry about deck rot, hidden water damage, and weight accumulation; Collierville enforces it to protect future buyers and lenders.
The permit fee in Collierville is typically $100–$350, calculated as a percentage of the declared project valuation (usually 1.5–2% of material + labor cost, or a flat fee per 'square' of roofing — 100 sq. ft. — at roughly $1.50–$3.00 per square for a 2,000 sq. ft. roof). If you're upgrading material (shingles to metal, for example), you'll likely need to file architectural drawings showing the new fastening pattern, ice-and-water shield placement (mandatory within 36 inches of eave edges in Collierville's climate zone 4A), and flashing details. A structural engineer's letter costs $300–$800 and is required only if the new material is heavier than the old (e.g., clay tile or slate on a 1950s roof framed for asphalt). For like-for-like asphalt-to-asphalt replacements, the engineer letter is waived if you provide the roofer's certified estimate showing material weight equivalence.
Collierville's climate zone (primarily 4A west of the Wolf River, 3A east) means ice-and-water-shield underlayment is non-negotiable. IRC R905.11 requires a self-adhering synthetic underlayment or bituminous ice-and-water shield extending at least 36 inches from the eave edge in cold-prone areas. The city's permit applications now include a checkbox for ice-and-water-shield compliance; if you skip it, the inspector will fail the final roof inspection and issue a correction notice (24–48 hour cure period before re-inspection, or $200 re-inspection fee). This is a common rejection point: contractors from warmer areas sometimes assume standard asphalt felt is acceptable, but it is not in Collierville.
Tear-off debris and deck inspection logistics are critical. When you remove existing shingles, you are legally required to inspect the deck for rot, nail pops, and water damage. Collierville's Building Department schedules a deck inspection (called 'bare deck' or 'framing inspection') after tear-off and before new underlayment installation. This inspection typically costs nothing extra but requires 24–48 hours' notice and takes 15–30 minutes. If the inspector finds rotten decking (common in Collierville's humid, clay-soil environment), you'll be required to replace the damaged boards before the re-roof proceeds. Budgeting $500–$2,000 for deck repair is wise if your roof is over 20 years old. The inspection is why permit-pulling is not optional — it catches safety hazards that homeowners and contractors often miss.
Owner-builders (homeowners pulling permits on their own owner-occupied home) are allowed in Collierville but must do the reroofing work themselves or hire a licensed contractor; the permit must name the contractor or list you as the responsible party. If you hire a roofer, they'll pull the permit themselves and list their contractor license number; you'll sign off as property owner. If you DIY, you pull the permit, file the roofing material data sheet and ICC-certified fastening pattern, and arrange inspections. Most homeowners let the roofer pull it; the $100–$350 permit cost is rolled into the job estimate (often called 'included in the quote' or itemized separately). Timeline for permit issuance is 1–2 business days for like-for-like applications submitted with complete drawings, 5–10 days if structural review or deck concerns require additional scrutiny.
Three Collierville roof replacement scenarios
The 3-layer rule: why Collierville enforces IRC R907.4 strictly, and what it means for you
The National Roofing Contractors Association (NRCA) and insurance underwriters have documented that roofs with three or more layers of shingles trap moisture, mask hidden damage (rot, mold, nail pops), and concentrate weight unevenly. In Collierville's humid, subtropical climate with significant summer thunderstorms, this risk is acute. If you have a 1980s ranch with two existing layers (common in Shelby County subdivisions built in the late 1980s), a third overlay — even with proper felt and flashing — voids most manufacturer warranties and raises red flags during refinancing inspections. Collierville's Building Department strictly enforces the IRC R907.4 prohibition: inspectors are trained to ask roofers for proof of layer count before issuing the permit. If a roofer is caught installing a third layer, the inspector can issue a citation (up to $1,000 in code violations) and order immediate removal.
The practical impact: before you get a quote, ask your roofer to inspect the current roof and count layers. If there are two layers, you MUST budget for a full tear-off and deck replacement. This adds $2,000–$5,000 to the job and extends the timeline by 3–5 days. If your roofer tries to convince you that a three-layer overlay is 'grandfathered in' or that Collierville won't catch it, decline that contractor and find one who knows the local code. Collierville's permit office has seen this argument before and always sides with IRC R907.4.
The silver lining: if you do the tear-off and replacement, you get a warranty reset. New asphalt shingles come with a 30-year manufacturer's warranty and often a labor warranty from the contractor (10–15 years for defects). That warranty is a selling point when you resell; it tells the buyer that the roof is functionally brand-new and the seller (you) invested in compliance and longevity.
Collierville's ice-and-water-shield requirement and why it matters in your climate zone
Collierville straddles climate zones 4A (west, cooler) and 3A (east, slightly warmer), with average winter lows of 30–35°F and occasional ice storms. Ice dams — ridges of ice that form at roof eaves and trap meltwater — are a known risk. To prevent water infiltration from ice dams, the IRC and all modern roofing codes require a self-adhering synthetic underlayment (also called ice-and-water-shield or rubberized asphalt membrane) covering the first 36 inches of roof area measured horizontally from the eave edge. This detail is non-negotiable in Collierville's permit application; if it is missing or under-specified, the inspector will fail the final roof inspection.
Common contractor mistakes in Collierville: roofers from Tennessee's warmer southern counties (Memphis, Jackson) sometimes treat ice-and-water-shield as optional or skip it to save $300–$500. This is false economy. The permit inspector will catch it on final inspection, issue a correction notice, and charge a re-inspection fee ($100–$200) if the work is not corrected within 24–48 hours. Worse, if an ice dam causes interior water damage and your insurance adjuster learns that the roof was installed without the required underlayment, the claim may be denied as 'failure to follow code.' Budget the ice-and-water-shield (roughly $200–$400 for a 2,000 sq. ft. roof) as non-negotiable.
The structural reason: ice-and-water-shield is a rubberized membrane that adheres to the roof deck and stretches slightly, allowing water trapped by ice to flow down the membrane and into the gutters rather than pooling and seeping into the attic. It is separate from the felt underlayment (which provides vapor transmission and protects shingles during installation). Both are required in Collierville's climate. The permit inspector will verify that ice-and-water-shield extends continuously from the eave line to 36 inches horizontally inboard, with no gaps, and that flashing is sealed with ice-and-water-shield at valleys, hips, and penetrations (chimney, vents).
Collierville City Hall, Collierville, TN (exact street address: verify via collierville.tn.gov)
Phone: (901) 457-2500 ext. Building Department (confirm by calling main line) | https://www.collierville.tn.gov (check for 'Permits' or 'Online Permit Portal' link)
Monday–Friday, 8:00 AM – 5:00 PM CST (closed municipal holidays)
Common questions
Do I need a permit if I'm just replacing damaged shingles after a storm?
If the repair covers less than 25% of your roof area (roughly 10 squares for a 2,000 sq. ft. roof), no permit is required — it is classified as a repair under IRC R907.2. If the damage is extensive (over 25%), a full tear-off-and-replace permit is required. Have the roofer assess the damage first; they'll tell you which category applies. Collierville does not require retroactive permits for minor storm repairs, but if you file an insurance claim, your adjuster may request proof that the work complies with current code (which it will, if done by a licensed contractor).
Can I roof over my existing shingles, or do I have to tear off to the deck?
If you have only ONE existing layer of shingles and the deck is sound, you can overlay with new shingles — no tear-off required, and the permit is straightforward (just the permit form, material spec, and ice-and-water-shield detail). If you have TWO or more existing layers, IRC R907.4 and Collierville code require a full tear-off to bare deck before new coverage. The roofer or building department can confirm layer count by visual inspection or photo before you commit to tear-off costs.
What if the inspector finds rot in the roof deck during the tear-off?
Deck rot is common in Collierville's humid climate, especially in 20+ year-old roofs. The deck inspection (scheduled after tear-off, before new underlayment) will reveal rot. If found, you'll be required to replace the rotten boards before proceeding — this is a safety issue and a code requirement. Budget $500–$2,000 for deck replacement; the roofer will provide an estimate after the inspection. Insurance may cover rot repairs if it is storm-related; otherwise, it is your cost. This is why the permit process is protective: you'd rather discover and fix rot before water damage spreads to framing and insulation.
Do I need a structural engineer's letter for a metal roof upgrade?
If you are changing materials (asphalt shingles to metal, tile, or slate), the building department requires a structural engineer's letter confirming that the roof deck can safely support the new material's weight and fastening pattern. Metal shingles are lighter than asphalt, so they usually pass easily (cost $300–$600 for the engineer letter). Tile or slate is heavier and may require deck reinforcement (cost $1,000+). For like-for-like asphalt-to-asphalt, no engineer letter is required. The roofer can provide a material weight equivalence statement in lieu of a full engineer letter if costs are equivalent.
How long does it take to get a roof permit in Collierville?
Like-for-like asphalt replacements typically receive permit approval within 1–2 business days via over-the-counter review. Material changes (to metal or tile) require structural review and may take 5–7 business days. Historic district projects add 2–3 weeks for Historical Preservation Commission approval. Once the permit is issued, the actual roof work (tear-off, deck inspection, installation, final inspection) takes 5–10 calendar days depending on weather and deck condition. Total project timeline: 7–14 days for a standard replacement, 4–5 weeks for a historic material upgrade.
What is the permit fee, and how is it calculated?
Collierville charges 1.5–2% of the declared project valuation, with a minimum of $100–$150 and a maximum typically capped at $400–$500 for large residential roofs. A $10,000 roof job estimates $150–$200 in permits. The roofer usually includes the permit fee in the quote or itemizes it separately. Some jurisdictions charge per square (100 sq. ft. increments); confirm the city's fee schedule by calling the building department or checking the online portal.
Can I DIY my roof replacement, or do I need to hire a licensed contractor?
Collierville allows owner-builders (homeowners) to pull permits for owner-occupied properties and perform the work themselves. However, roofing is physically demanding and requires fall protection, proper fastening technique, and knowledge of ice-and-water-shield and flashing specs. Most homeowners hire a licensed roofing contractor (who pulls the permit and signs off on the work) rather than DIY. If you do DIY, you pull the permit, file the material and fastening specs, and schedule inspections. The building department will inspect your work to the same code standards as a contractor's. If you are not experienced, hiring a contractor is safer and often faster.
What happens if the roofer did not pull a permit and the work is discovered later?
If the city inspector or a neighbor reports unpermitted roofing work, the building department will issue a stop-work order and fine (typically $500–$1,500). You'll be required to pull a retroactive permit, pay double the standard permit fee, and pass a final inspection. If you later sell the home, the title search may flag unpermitted work; Tennessee's real estate transfer disclosure statement requires disclosure of unpermitted structural improvements. This can kill a sale or force a price reduction. It is far cheaper to pull the permit upfront ($150–$300) than to deal with retroactive fines and disclosure issues.
Are gutters and flashing-only work (no shingles) exempt from permitting?
Yes. Gutter replacement, flashing repair, and valley sealing without any shingle coverage are typically exempt from permitting if they are repairs to existing conditions. If you are installing new flashing as part of a full roof replacement, the permit covers the flashing as part of the overall job. If you are upgrading gutters or flashing as a standalone project, no permit is required, but ensure the work meets current code (e.g., gutters sized to drain eaves per IRC R905.2).
Does Collierville require specific underlayment or brand specifications in the permit application?
The permit application asks for underlayment type (asphalt felt, synthetic, or ice-and-water-shield) and coverage area (36 inches minimum from eaves in climate zones 3A–4A). You do not need to specify brand (GAF, Owens Corning, etc.) unless the department requests it during review. However, the material must meet ASTM D1970 (for ice-and-water-shield) or ASTM D226 (for asphalt felt). Your roofer's material quote will specify the product; ensure it is code-compliant before signing the contract.