What happens if you skip the permit (and you needed one)
- Stop-work order issued by Harrison Building Inspector costs $250–$500 and halts labor; you then pay double permit fees ($200–$800 total) to re-pull and re-inspect.
- Homeowner's insurance denial on roof claim if unpermitted work is discovered during loss investigation—could cost you $15,000–$50,000 in uncovered water damage.
- Property transfer mandatory disclosure: unpermitted roof work must be declared to buyers; most will demand a $5,000–$15,000 escrow holdback or walk.
- Mortgage refinance blocked: lenders order title search and roof inspection; unpermitted major work kills loan approval mid-closing.
Harrison roof replacement permits—the key details
IRC R907.4 is the rule that catches most Harrison homeowners: if the existing roof has three or more layers of shingles, you must tear off to the deck—no overlay allowed. The City's inspectors check this during the pre-permit site visit or at framing inspection. If your roofer tries to overlay a three-layer roof and the inspector catches it (which they will), the entire new layer comes off at your cost, and the permit is voided. Two-layer roofs can be overlaid in Harrison if the existing layer is in decent condition and you meet fastening and underlayment specs. The permit application must state 'number of existing layers' as a required field; if you're unsure, your roofer should walk the roof with photos and count them. This single detail causes roughly 15–20% of Harrison roof-permit rejections.
Ice-and-water-shield (often called ice dam protection) is a non-negotiable specification in Harrison's climate zone. IRC R905.1.2 requires an ice-and-water membrane from the lowest point of the roof (gutterline) at least 24 inches inland (zone 5A) or 36 inches inland if you're in the 6A portion north of Interstate 287. Many online permit applications and big-box roofing quotes skip this or assume it's standard; it is not optional in Harrison. The membrane must be specified by product name or equivalent in your permit application. Your roofer will order it, but YOU verify it's in the contract and on the invoice. Inspectors often spot-check the eaves during mid-work inspection to confirm width and overlap. Failure to install it to spec is grounds for inspection failure and re-do.
Underlayment type and fastening pattern must be detailed in the permit application or it will be rejected. The IRC R905 section and Harrison's adoption of it require synthetic underlayment (typically specified as ASTM D226 Type II or equivalent; older felts are no longer code-compliant). Fastening must be nailed per manufacturer spec (usually 4–6 inches on-center along seams and 8–10 inches off-seams). If your application just says 'standard underlayment' or 'roofer's standard,' it will bounce back for clarification. Your roofer's contract and spec sheet must be clear; if they push back, that's a red flag. Inspectors sometimes pull underlayment back at mid-work to verify fastening pattern, so this is not a check-box—it matters.
Material changes (shingles to metal, tile, slate) require structural evaluation per IBC 1511 because the roof deck may not be designed for the new weight. A metal roof is roughly 2 psf heavier than asphalt shingles; concrete tile can be 12+ psf. Harrison's plan reviewer will reject applications without a PE-stamped structural engineer report confirming your roof framing can handle it. The PE study costs $500–$1,500 and adds 2–4 weeks to permitting. If your home is pre-1980 and you're moving to tile or metal, the PE is almost certain to flag reinforcement needs (sistering joists, collar ties, etc.), which then become a separate structural permit and cost $3,000–$10,000. Asphalt shingle-to-asphalt shingle or shingle-to-architectural shingle requires no structural evaluation.
Flashing and penetration details must be specified: chimneys, skylights, vents, and valleys all require manufacturer-approved flashing per IRC R903.2. If your application says 'standard chimney flashing' and the inspector arrives to find generic aluminum flashing instead of a chimney-cricket or stepped flashing kit, the work fails inspection. Your roofer should provide cut sheets for each penetration; verify these are in the permit file before inspection. Roof pitch, predominant material, and total square footage (or 'squares') must also be in the application—Harrison's permit fee is calculated as a base fee plus a per-square charge ($15–$30 per square, depending on complexity), so accuracy matters for fee calculation and later dispute avoidance.
Three Harrison roof replacement scenarios
Ice-and-water shield in Harrison's climate zone 5A/6A: Why it matters and how to spec it
Harrison's location in the NYC metropolitan area straddles climate zones 5A (south and central) and 6A (north of I-287). The distinction is critical because it changes the required ice-and-water-shield width from 24 inches (zone 5A) to 36 inches (zone 6A) per IRC R905.1.2. Many homeowners and even some local roofers treat ice-and-water shield as a nice-to-have upgrade, but it is code-mandatory in Harrison and inspectors enforce it. The purpose is simple: ice dams form on cold roofs when snowmelt refreezes at the eaves, and water backs up under shingles, soaking into the attic and rotting framing. Harrison's 42–48 inch frost depth and winter temperatures hovering around freezing (32–40°F) make ice dams common. The membrane (typically Grace Ice & Water Shield, GAF WeatherWatch, or equivalent) must be ordered and installed before the underlayment goes down; it sits directly on the deck.
Specification in your permit application must include: product name (or 'equivalent ASTM D226 Type II'), width (24 inches for zone 5A, 36 inches for zone 6A, measured from the lowest point of the roof—gutterline—inland toward the ridge), and the fact that it covers the entire roof width and extends past all roof penetrations (chimneys, skylights, vents). If your home is in north Harrison (Old Field Road north, Westchester Avenue north), assume 6A and order 36 inches. If you're in central Harrison (near Harrison Avenue, Halsey Pond area), confirm with the City's permitting office or check your property against the NOAA climate zone map. Your roofer's invoice should break out ice-and-water shield cost (typically $300–$600 for a 28-square roof); if it's bundled or not mentioned, ask. Inspectors will sometimes pull back shingles at the eave during mid-work inspection to measure width, so this is not a cosmetic choice.
Common mistake: homeowners or roofers assume 'ice-and-water shield' is just the brand name and order cheaper 'underlayment' (tar paper) instead. They are different products. Underlayment is the layer that goes over the ice-and-water shield; it's what the shingles nail through. Ice-and-water shield is a sticky-backed membrane that goes down first, covers the lower 24–36 inches of the roof, and seals nail holes. If your inspector finds underlayment nailed directly to the deck with no ice-and-water shield underneath, the work fails inspection. Your roofer must order both, layer them correctly, and it must be in the permit file. Verify on the invoice before the roofer starts: 'Ice-and-water shield, 36 inches (or 24 inches), [brand], [square footage]' and 'Synthetic underlayment, [brand], full coverage.'
Cost impact: ice-and-water shield adds roughly $4–$8 per square to the material cost (28-square roof = $112–$224 material, plus labor). It's often lumped into 'roofing upgrade' pricing by larger contractors. If your roofer quotes a roof replacement without explicitly listing ice-and-water shield, push back and get a separate line item. Harrison inspectors will cite you if it's missing, and you cannot simply add it later—the entire new shingle layer must come off to access the deck, so do it right the first time.
Structural evaluations for material changes: Metal, tile, and the PE stamp requirement
If you want to replace asphalt shingles with metal, concrete tile, or slate, the City of Harrison requires a Professional Engineer (PE) structural evaluation per IBC 1511. This is not optional, not waivable, and not a suggestion—it is code. The reason: asphalt shingles weigh roughly 2–3 psf; metal roofing is 2–4 psf; concrete tile is 12–15 psf; slate is 15–20 psf. A typical roof is framed for about 20 psf total load (including snow), so a move to heavy material (tile or slate) can exceed the design limit. If the engineer stamps the roof as inadequate, you must reinforce it (sistering joists, adding collar ties, beefing up the ridge beam) before the new roof goes on. This is non-negotiable and costs $3,000–$15,000 depending on scope.
How to get a PE report: Hire a structural engineer licensed in New York to inspect your roof framing and calculate whether it can handle the new material. Cost is typically $500–$1,500 for a residential roof evaluation; you'll pay more if the engineer must do structural drawings or stamp reinforcement plans. The engineer will visit your home, measure framing members (joist size, spacing, ridge support), check for existing damage or settlement, and issue a report stamped with their PE number and signature. The report must state either 'the existing roof framing is adequate for [new material]' or 'the existing roof framing requires reinforcement: [specific work required].' You submit this report with your permit application; without it, the City will reject the application and ask you to obtain one.
Timeline impact: Plan-review time for a material-change roof permit is 2–3 weeks because the city must review the PE report. If the engineer flags reinforcement, that becomes a separate structural-work permit, adding another 1–2 weeks and possibly requiring a separate inspection before the new roof is installed. Total permitting timeline for a tile or slate roof: 4–6 weeks. For metal roofs (lighter weight), the PE is often a simple 'adequate as-is' letter and moves faster. Before you sign a contract with a roofer for a material change, ask them to recommend a structural engineer or provide one; many roofers have relationships with engineers and will arrange it. Do not let the roofer pull the permit without the PE report in hand.
Cost recovery: Some homeowners expect the engineer's cost to be minor, but $1,000–$2,000 for a PE report and potential $5,000–$10,000 in framing reinforcement can add 20–30% to a tile-roof project, making the economics less attractive. Metal roofing, by contrast, usually clears the PE without reinforcement, so it's cheaper to implement. If you're considering a material change, budget for the PE upfront and factor it into your decision. The report is part of your property record and title, so it adds value if a future buyer is curious about roof specifications.
Harrison City Hall, 200 High Street, Harrison, NY 10528
Phone: (914) 670-3000 (main) — ask for Building Department or Building Inspector | https://www.harrisonny.gov/ (check 'Permits & Licenses' or contact building department for portal access)
Monday–Friday, 8:00 AM–5:00 PM (Eastern); closed major holidays
Common questions
Does a tear-off really mean the whole roof has to come off, or can the roofer work around the three layers?
IRC R907.4 requires complete removal of the existing roof system if three or more layers are present. There is no 'partial tear-off' option; the inspector will cite incomplete work if you try to overlay a three-layer roof. The reason is that layered roofs cannot support additional weight, deck fastening becomes unreliable, and water damage risk escalates. If your roof has three layers and you want to replace it, budget for full tear-off labor (typically $1,500–$3,000 additional cost over overlay) and debris removal. The good news: once the layers are off, you can install new underlayment and shingles properly.
My roofer says they've been doing overlays in Harrison for years without permits. Should I worry?
Yes. Unpermitted roof work in Harrison is discovered through: (1) neighbor complaints to the building department (common), (2) permit applications for other work that trigger title/property review, and (3) insurance claims or home sales (which require disclosure of unpermitted work). When caught, you face a stop-work order, double permit fees, and mandatory inspection before approval. For home sales, unpermitted roof work must be disclosed and typically triggers a $5,000–$15,000 buyer escrow holdback or renegotiation. Your homeowner's insurance can also deny a claim if they discover the roof was installed without permit. The permit cost ($200–$800) is a tiny fraction of the risk; get it pulled.
How do I know if my home is in climate zone 5A or 6A for the ice-and-water shield requirement?
Harrison is split: south and central Harrison are zone 5A (24-inch ice-shield requirement); north of Interstate 287 is zone 6A (36-inch requirement). The easiest check: call the City of Harrison Building Department and provide your street address; they can confirm your zone. Alternatively, cross-reference your property on the NOAA climate zone map (climate.weather.gov) or ask your roofer to check the IRC R905 appendix. When in doubt, install 36 inches—it's safer, costs only $50–$100 more, and guarantees code compliance. Do not guess; confirm in writing before the roofer orders materials.
What if the inspector finds rot or structural damage during the roof replacement?
If hidden damage is discovered (soft deck, rotten joists, soft ridge board), the roofer should stop work and notify you and the building department. You then have two options: (1) repair the damage under the existing roof-replacement permit (adds cost and timeline but simplest), or (2) pull a separate structural-work permit for the repairs if they are extensive. Most Harrison inspectors allow minor deck repairs (sister a rotten joist, replace a few deck boards) to be incorporated into the roof permit with a supplemental inspection. Major structural issues (ridge-beam failure, joist rot across multiple bays) require a structural engineer report and a separate permit. Budget an additional $2,000–$8,000 for unknown deck repairs; most homeowners encounter minor issues.
Can I pull the roof permit myself, or does the contractor have to do it?
Owner-occupants in Harrison may pull permits for work on their own homes; you do not have to be licensed. However, roofing contractors almost always pull the permit themselves because it's part of their standard process. Confirm with your roofer in writing that they will pull the permit before any work starts; do not assume. Get a copy of the permit number and inspection schedule. If you're hiring a DIY roofer or a contractor from another state, you may need to pull the permit yourself; Harrison's building department can walk you through the application over the phone.
How long does the permit actually take from application to final inspection?
Like-for-like overlays (asphalt shingle to asphalt shingle, no material change) are often approved over-the-counter in 1–3 days if all specs are clear. Mid-work inspection is typically scheduled within 5–7 business days of application. Final inspection happens after the roofer notifies the city that work is complete, usually within 1–2 weeks. Total time from permit pull to final sign-off: 10–14 business days for a straightforward overlay. Material-change permits or tear-offs with structural evaluations take 3–4 weeks for plan review alone, plus inspection scheduling. If the inspector finds a deficiency (missing ice-shield, wrong underlayment), you have a re-inspection fee ($50–$100) and a 3–5 day delay. Always build in 4 weeks of buffer for a major roof project to avoid scheduling conflicts.
The roofer's quote says 'ice-and-water shield, standard.' What does that mean, and should I ask for specifics?
Do not accept vague specs. 'Standard' could mean tar paper, cheap synthetic underlayment, or an actual ice-and-water membrane—each is different. Ask the roofer to specify: 'Ice-and-water shield, [brand name], [width: 24 or 36 inches], full coverage.' Examples: 'Grace Ice & Water Shield, 36 inches, full coverage' or 'GAF WeatherWatch, 24 inches, eave to 24 inches inland.' Get the product name, width, and square footage on the invoice. If the roofer pushes back or says 'it's all the same,' consider hiring a different contractor—this detail matters for code compliance and inspector approval.
If I'm doing an asphalt-to-metal roof and the PE says 'adequate as-is,' do I still need a structural permit?
No. If the PE stamps the report 'the existing framing is adequate for metal roofing,' you submit the report with your roof-replacement permit application, and that satisfies the structural requirement. No separate structural permit is needed. However, if the PE identifies reinforcement needs, you must pull a structural-work permit for the framing work, complete that work with inspections, and then pull the roof permit. The roof permit depends on the structural work being complete. Always ask the roofer: 'Once we get the PE report, will we need a separate structural permit for framing?' and plan timeline accordingly.
What happens if I overlap the same roof twice (two separate roof replacements) and now I have three layers?
If you replaced your roof once 10 years ago with an overlay, and now want to overlay again, you will have three layers. This is not permitted per IRC R907.4 and the City will catch it during the permit inspection. You must tear off both existing layers down to the deck before installing the new roof. This is why some homeowners regret the first overlay decision—it commits them to a full tear-off on the second replacement. If you're doing a first overlay now, ask yourself: will I want to overlay again in 15 years? If yes, do a tear-off now; if you plan to move before a second replacement, an overlay is fine.
Does Harrison require hurricane straps or metal connectors on the roof, or is that just Florida?
Harrison is not in a hurricane wind zone (that's Florida, coastal Carolina, etc.), so the Florida Building Code wind-tie requirements do not apply. However, New York State does have wind-load requirements for roofs, especially in exposed areas or on taller buildings. For a standard single-family home in Harrison, the builder's original hurricane straps or truss connectors are already in place; you do not need to add them during a reroof. The roof-replacement permit focuses on deck attachment (nailing pattern, underlayment fastening) and shingle fastening, not structural ties. If your home is on a hill or near open water (rare in central Harrison) or if the inspector flags unusual wind exposure, they may ask for reinforcement, but this is not typical.
More permit guides
National guides for the most-asked homeowner permit projects. Each goes deep on code thresholds, common rejections, fees, and timeline.
Roof Replacement
Layer count, deck inspection, ice dam protection, hurricane straps.
Deck
Attached vs freestanding, footings, frost depth, ledger, height/area thresholds.
Kitchen Remodel
Plumbing, electrical, gas line, ventilation, structural changes.
Solar Panels
Structural review, electrical interconnection, fire setbacks, AHJ approval.
Fence
Height/material limits, sight triangles, pool barriers, setbacks.
HVAC
Equipment changeouts, ductwork, combustion air, ventilation, IMC sections.
Bathroom Remodel
Plumbing rough-in, ventilation, electrical (GFCI/AFCI), waterproofing.
Electrical Work
Subpermits, NEC sections, panel upgrades, GFCI/AFCI, who can pull.
Basement Finishing
Egress, ceiling height, electrical, moisture barriers, occupancy rules.
Room Addition
Foundation, footings, framing, electrical/plumbing extensions, structural.
Accessory Dwelling Units (ADU)
When permits are required, code thresholds, JADU vs ADU, electrical/plumbing/parking rules.
New Windows
Egress, header sizing, structural cuts, fire-rating, energy code.
Heat Pump
Electrical capacity, refrigerant handling, condensate, IECC compliance.
Hurricane Retrofit
Roof straps, garage door bracing, opening protection, FL OIR product approval.
Pool
Barriers, alarms, electrical bonding, plumbing, separation distances.
Fireplace & Wood Stove
Hearth, clearances, chimney, gas line work, NFPA 211.
Sump Pump
Discharge location, electrical, backup options, plumbing tie-in.
Mini-Split
Refrigerant lines, condensate, electrical disconnect, line set sleeve.