Roofing Companies Smithtown NY — Local Roofers for 11787 & 11788

LI Roofing Co. is a licensed Smithtown roofing contractor serving zip codes 11787 and 11788 as well as the surrounding hamlets of St. James, Kings Park, Nesconset, and Hauppauge. We handle GAF Timberline HDZ and CertainTeed shingle installations, flat roof repairs and full TPO/EPDM replacements, and complete tear-offs on homes ranging from 1940s cape cods to 1970s split-levels. Common Smithtown roofing issues include ice dams from a mature tree canopy that shades north-facing slopes through winter, and moss and algae growth accelerated by humidity off Long Island Sound. We address both with algae-resistant shingles and proper ice and water shield coverage from day one. The Smithtown Building Department permit process covers all hamlets in the Town of Smithtown — we handle all permit filings, fee payments, and final inspections so you never need to visit Town Hall. GAF Master Elite certified. Suffolk HIC licensed.

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Q: What roofing companies Smithtown NY homeowners trust for North Shore ice dam and moss work? A: Roofing companies Smithtown NY homeowners trust for North Shore conditions — ice dams in Kings Park and Fort Salonga, moss on shaded slopes in Nesconset, and wind uplift on Sound-facing bluffs — need specific local experience, not just generic roofing skills. LI Roofing Co. is the roofing company Smithtown NY calls for all of it: 65+ completed jobs across Smithtown, Kings Park, Saint James, Nissequogue, Fort Salonga, Head of the Harbor, and Nesconset since 2014. We're GAF Master Elite certified, pull Town of Smithtown Building Department permits on every job (10-15 business day turnaround), and install extended ice and water shield — 36 inches past the interior wall line — on every north-facing slope with ice dam history. Among roofing companies Smithtown NY homeowners compare, we're the only one offering GAF's Golden Pledge warranty: 25-year workmanship coverage backed by the manufacturer. Call (631) 507-3842 for a free estimate.

Q: Which roofing companies serve Smithtown NY? A: LI Roofing Co. is a GAF Master Elite certified roofing contractor serving all of Smithtown NY, including zip codes 11787 and 11788 and the hamlets of St. James, Kings Park, Nesconset, Hauppauge, Head of the Harbor, Nissequogue, and Fort Salonga. We have completed 65-plus jobs in the Town of Smithtown since 2014.

Q: Do you pull permits for roofing in Smithtown? A: Yes. We handle all permit filings with the Town of Smithtown Building Department on every job. This covers all Smithtown hamlets — Smithtown, Kings Park, Saint James, Nesconset, Fort Salonga, Nissequogue, and Head of the Harbor. Permit turnaround is typically 10-15 business days. You do not need to visit Town Hall or manage any paperwork.

Q: What roofing materials work best in Smithtown? A: For most Smithtown homes, GAF Timberline AS II or CertainTeed Landmark AR (algae-resistant variants) are the best choice. Smithtown properties with north-facing slopes and mature tree cover are prone to moss and algae, which shorten standard shingle life by 5-8 years. For North Shore properties in Kings Park and Nissequogue with direct Long Island Sound wind exposure, we use a 6-nail high-wind installation pattern. Ice and water shield at 36 inches past the interior wall line (exceeding the 24-inch code minimum) is standard on all north-facing slopes.

Q: How much does roof replacement cost in Smithtown NY? A: Typical Smithtown roof replacement costs based on 2024-2025 completed jobs: ranch or cape cod (1,400-1,700 sqft) runs $9,500-$13,500 single-layer or $11,500-$16,000 with a two-layer tear-off. Split-level or raised ranch (1,700-2,200 sqft) runs $12,500-$18,500. Colonial (2,200-3,000 sqft) runs $15,000-$23,000 for GAF Timberline HDZ. All prices include permit, disposal, and workmanship warranty.

Smithtown's housing stock reflects the town's development timeline in a way that makes it genuinely distinct from other North Shore communities. The neighborhoods break down roughly by era and geography.

Smithtown contains a significant concentration of homes built between the late 1940s and early 1970s — ranch homes, cape cods, and split-levels that now carry roofs either at or well past their design life. The postwar housing tracts in Smithtown hamlet, Nesconset, and the fringes of Kings Park mirror the Levittown-era construction of Nassau County: economical framing, lower roof pitches, and materials that were not engineered for 30-year lifespans. Many of these homes have had one full re-roof already, and that second roof is now aging. Roofing companies serving Smithtown NY routinely encounter two-layer tear-offs, aging board sheathing, and undersized ridge ventilation on these older structures.

Proximity to Long Island Sound creates humidity and moss conditions that inland Nassau County roofing jobs rarely see. Homes in Kings Park, Nissequogue, and Fort Salonga sit on North Shore bluffs where prevailing winds carry salt-laden moisture from the Sound year-round. This accelerates granule loss on south-facing slopes and promotes algae and moss growth on north-facing surfaces with limited sun exposure. Unaddressed moss retains moisture against the shingle surface, shortening effective life by 5-8 years. We specify algae-resistant shingles (GAF Timberline AS II or CertainTeed Landmark AR) on every Smithtown job with significant tree coverage or north-facing exposure. We also install zinc or copper ridge strips as a low-maintenance moss-suppression measure on properties with recurring algae problems.

1960s-70s split-levels and cape cods. The core of Smithtown hamlet and the Nesconset area were developed primarily in the 1960s and early 1970s. Streets like Landing Avenue, Edgewood Avenue, and the neighborhoods south of Jericho Turnpike are full of split-levels, raised ranches, and cape cods from this era. These homes typically have roof areas of 1,500-2,000 square feet and have generally been roofed once or twice already. Many of these 1990s and early 2000s re-roofs are now at end of life.

Cape cods and older homes in St. James and Nissequogue. St. James and Nissequogue contain some of the oldest housing stock in the Town of Smithtown. There are cape cods, farmhouse-style homes, and early-postwar ranches from the 1940s and 1950s scattered throughout these neighborhoods. These homes often have lower-pitch rooflines with older plank board sheathing under the current shingles. When we tear off the shingles, we sometimes find the old board sheathing is still solid — or we find it needs replacement, which is something we price out openly when it comes up.

Ice dams on north-facing slopes. This is the issue that comes up most often with Smithtown homeowners on the north side of town. Neighborhoods in Kings Park, Fort Salonga, and Nissequogue that sit on bluffs or in valleys with northern exposures get significant ice dam formation in cold winters. Ice dams form when heat from the attic melts snow near the ridge, the water runs down the slope, and then refreezes at the cold eaves where there is no attic heat. The ice backs up under the shingles and can drive water into the house.

The proper fix for ice dam damage is not better shingles alone — it is proper attic insulation, air sealing, and continuous ventilation. But on the roof side, we install ice and water shield from the eave a minimum of 24 inches above the interior wall line (per New York state code), and more on north-facing slopes with known ice dam history. This creates a self-sealing barrier that prevents melt water from penetrating the deck even if ice does form.

North Shore wind exposure. Smithtown's northern reaches, particularly Kings Park, Fort Salonga, and Nissequogue, sit on bluffs overlooking Long Island Sound. These homes get sustained wind exposure that tests shingle adhesion and ridge vent fastening. We pay extra attention to wind-resistant installation on Sound-facing slopes — using full seal strips and additional fasteners on ridge cap shingles where exposure is significant.

Caleb Smith State Park corridor. Homes along Jericho Turnpike near Caleb Smith State Park have heavy tree coverage. Debris accumulation in valleys and gutters is constant. Moss and algae develop on shaded slopes within 5-8 years without algae-resistant shingles. We recommend GAF Timberline AS II or CertainTeed Landmark AR for any Smithtown property with significant shade.

Chimney repair in Smithtown. Many Smithtown homes — particularly 1960s-era colonials and ranches in Nesconset and near the Hauppauge border — have aging brick chimneys that need repointing, crown repair, or flashing replacement. We handle chimney flashing replacement during every full roof replacement. Standalone chimney repointing and crown work is available and quoted separately.

These are actual project costs from Smithtown jobs completed in 2024-2025, not national averages.

Ranch or cape cod (1,400-1,700 sqft):

• Standard GAF HDZ, single-layer: $9,500-$13,500
• Two-layer tear-off: $11,500-$16,000
• Ice dam history: add $600-$1,200 for extended ice and water shield coverage

Split-level or raised ranch (1,700-2,200 sqft):

• Standard GAF HDZ: $12,500-$18,500
• North Shore wind-rated installation: no significant upcharge, part of standard practice

Colonial or larger home (2,200-3,000 sqft):

• GAF Timberline HDZ: $15,000-$23,000
• Designer shingle (Grand Canyon, Presidential): $21,000-$35,000
• Standing seam metal (St. James / Nissequogue premium homes): $25,000-$45,000

Town of Smithtown permit fee: $350-$500 for a residential roof replacement. Included in our estimates — we pull the permit, pay the fee, manage inspections, and provide final documentation.

Flat roofing in Smithtown: Residential garage flat roofs and sunroom additions run $2,800-$6,500. Commercial properties along Route 25 and Kings Park are priced per square foot based on system type.

The Town of Smithtown Building Department handles permits for all hamlets within the town: Smithtown, Kings Park, Nissequogue, Saint James, Head of the Harbor, Fort Salonga, and Commack. A permit is required for any full roof replacement. Minor repairs covering less than 25% of the roof area generally do not require a permit.

The permit application process involves submitting specifications for the scope of work. We handle the application, the permit fee ($350-$500 typical), the required final inspection, and the permit card. You do not need to visit Town Hall. Turnaround from the Town of Smithtown Building Department is typically 10-15 business days.

The department has specific requirements around chimney height relative to ridge height and certain setback conditions that occasionally affect roofing jobs in older Smithtown neighborhoods. We have pulled dozens of Smithtown permits and are familiar with the local requirements.

Smithtown has a meaningful number of ranch and hi-ranch homes with flat-roof additions, attached garages, and sunroom extensions. Commercial properties along Route 25 and Jericho Turnpike in Smithtown and Kings Park have flat TPO or modified bitumen roofs.

TPO is the most common flat roofing material we install for Smithtown residential additions. A 60-mil TPO system handles the thermal expansion and contraction that comes with LI's temperature swings better than older materials. Most Smithtown residential flat roof additions run $2,800-$6,000.

Modified bitumen torch-down is a good choice for Smithtown homes where the flat section has complex penetrations (plumbing vents, HVAC equipment, parapet walls). It provides a thick, tough membrane that handles foot traffic.

EPDM is a rubber-based system that works well on simple low-traffic flat roofs and is available in large sheets that minimize seams. We use EPDM on certain residential applications in Smithtown, particularly smaller garage additions.

Colonial on Landing Avenue, 2025. Full replacement with GAF Timberline AS II (algae-resistant) in Shakewood. 2,400 sqft. 3 days. $20,000. Heavy tree shade on north slope required extended ice and water shield.

Cape cod in St. James, 2025. 1960s cape with board sheathing. Single-layer tear-off, two dormers re-flashed, 12 sheets of sheathing replaced over dormers. CertainTeed Landmark AR in Hearthstone Gray. 1,600 sqft. 3 days. $16,800.

Ranch in Kings Park, 2024. Standard GAF HDZ in Charcoal. 1,600 sqft. 2 days. $13,500. North Shore wind-rated installation with enhanced ridge cap fastening.

Standing seam metal in Saint James, 2024. Standing seam steel in Dark Bronze. 2,000 sqft. 4 days. $26,000. Premium home near the harbor.

Review 1: "Our Smithtown colonial sits on a wooded lot that was destroying our roof with moss and debris. Tom recommended algae-resistant shingles and added gutter guards. Two years later the roof still looks new and we stopped cleaning the gutters every month." — Patricia H., Smithtown · GAF AS II · 2024

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Q: How much does roof replacement cost in Smithtown, NY? A: A typical Smithtown split-level or ranch (1,700-2,200 sqft) runs $12,500-$18,500 using GAF Timberline HDZ with single-layer tear-off. Two-layer tear-offs add $1,500-$3,500. Colonials in the 2,200-3,000 sqft range run $15,000-$23,000 for standard shingles. Designer shingles for premium homes in St. James or Nissequogue run $21,000-$35,000. All prices include permit, disposal, and workmanship warranty.

Q: Which roofing companies serve Smithtown, NY? A: LI Roofing Co. is a GAF Master Elite certified roofing contractor serving all Smithtown hamlets including Smithtown, Kings Park, Saint James, Nissequogue, Head of the Harbor, Fort Salonga, and Nesconset. We have completed 65+ jobs in the Town of Smithtown since 2014.

Q: What is causing my Smithtown roof to leak after snow? A: Ice dams are the most common culprit on north-facing slopes in Smithtown, especially in Kings Park, Fort Salonga, and Nissequogue. Ice dams form when attic heat melts snow at the ridge, the water runs down to the cold eave, and refreezes, backing water under the shingles. The fix involves proper attic insulation and ventilation plus extended ice and water shield on vulnerable slopes.

Q: Do I need a permit for a roof replacement in Smithtown? A: Yes. The Town of Smithtown Building Department requires a permit for full roof replacements. Permit fees run $350-$500. We handle the application, fee payment, and inspection scheduling on every job in Smithtown, Kings Park, Saint James, and the other hamlets.

Q: How long do roofs last in Smithtown's climate? A: Standard GAF Timberline HDZ carries a 130 mph wind warranty and algae resistance. Properly installed, expect 25-30 years. North Shore properties in Kings Park and Nissequogue with Sound wind exposure should use enhanced adhesive installation. Properties with heavy tree shade benefit from algae-resistant shingles.

Q: What roofing contractor in Smithtown handles ice dam issues? A: We have handled ice dam repairs and preventive installations across Kings Park, Fort Salonga, and Nissequogue for years. The roofing component of ice dam prevention involves extended ice and water shield — we apply it from the eave at least 24 inches beyond the interior wall line and further on known problem roofs. We also recommend and install ridge vent conversions that improve attic ventilation.

Q: Does LI Roofing Co. do flat roofing in Smithtown? A: Yes. We install TPO 60-mil and 80-mil flat roofing systems, modified bitumen torch-down, and EPDM for residential garage additions and commercial Route 25 properties in Smithtown. Residential flat roofs typically run $2,800-$6,000. Commercial applications are priced per square foot.

Q: How long does a roof replacement take in Smithtown? A: Most Smithtown residential jobs are 2-3 working days. A ranch or cape cod under 1,800 sqft with a simple roofline is typically 2 days. A larger colonial with complex valley work, dormers, or a two-layer tear-off runs 3 days. We provide a day-by-day schedule before we start.

Smithtown is one of the oldest towns on Long Island — founded in the 1660s and known for its distinctive historic marker: the Bull at the intersection of Route 25 and Route 25A, commemorating the town's founding legend. The streets surrounding Smithtown's historic core contain some of the most architecturally varied housing on the North Shore, including a meaningful concentration of colonial-era and early-postwar homes that require a different level of care than the split-levels and ranches that dominate the rest of Suffolk County.

Colonial and early-postwar homes in the historic core. The neighborhoods immediately around Main Street, Landing Avenue, and the Mill Road corridor in Smithtown hamlet contain homes built as far back as the 1920s and 1930s, with a larger cohort from the 1940s and early 1950s. These homes tend to have steeply pitched gable roofs, brick or stone chimneys with crown and parging that need attention at every re-roof, and multiple intersecting dormers that create complex valley systems requiring hand-cut flashing work. The rooflines on some of these homes are genuinely complex — four or five valleys, a mix of gable and hip sections, and dormers that break into the main roof plane at non-standard angles. We handle this geometry routinely. Standard production-run roofers who primarily install 1970s ranch roofs sometimes struggle with the cut complexity on a 1940s Smithtown colonial.

Hip roofs on older Smithtown properties. Hip roofs — where all four sides slope down to the eaves rather than terminating in a flat gable end — were common on Smithtown colonials and bungalows built between the 1920s and 1950s. Hip roofs are structurally sound and wind-resistant, but they require more cuts, more hip cap shingles, and more precise flashing at the four hip ridges. The hip cap installation on an older Smithtown home with an irregular pitch (sometimes 9/12 or 10/12) is a place where cut quality and alignment matter visibly from the street. We take extra time on hip ridge layout to get the alignment right before the first cap goes on.

Chimney work on historic Smithtown homes. Virtually every pre-1960 home in the Smithtown historic core has at least one masonry chimney. Some have two or three. Chimneys on these homes frequently have deteriorated crowns, failed mortar at the flue liner joints, and original flashing that was installed with lead or asbestos-containing materials. We address all flashing at every full re-roof — step, counter, and cap flashing around the full chimney perimeter, new galvanized or copper counterflashing depending on the homeowner's preference and the chimney's exposure. If the crown (the concrete cap on top of the chimney) is cracked, we repair or rebuild it during the roofing project. We also offer standalone chimney repointing through our subcontractor network for homes where the flue itself needs structural attention separate from the roof project.

Saint James and Nissequogue premium properties. Saint James sits immediately east of Smithtown hamlet along Route 25A and contains a concentration of larger, older homes on half-acre and full-acre lots. The streets off Harbor Road and Lake Avenue in Saint James have Victorian-era farmhouses and early colonial-revival homes with wraparound porches, steep hip-and-gable combinations, and original wood framing that dates to the early 1900s. These are premium properties by Smithtown standards, and the homeowners expect material quality, alignment, and finish work to match the character of the house. We have completed standing seam copper and steel roofs, designer shingle installations, and complex multi-section tear-offs in Saint James and recommend starting the conversation with a site visit rather than a phone quote — these homes need to be seen before we can quote them accurately.

Smithtown hamlet and Nesconset. The core Smithtown hamlet and Nesconset neighborhoods are primarily 1960s-70s split-levels and ranches on quarter-acre lots. Most of these homes have had one full re-roof. Common issues on the second replacement include discovering the first replacement was an overlay (two layers), aging ridge vents that need to be replaced, and soffit ventilation that was never properly balanced. We address all of these on every Smithtown estimate.

Kings Park. Kings Park sits on a bluff above Long Island Sound and has meaningfully higher wind exposure than inland Smithtown. The neighborhood also contains a number of affordable 1960s-era colonials with complex rooflines — multiple dormers, intersecting ridges, and roof-to-wall transitions that require careful flashing work. We have roofed dozens of Kings Park homes and are familiar with the specific staging logistics on bluff-top properties.

Saint James. Saint James contains some of the oldest housing stock in the Town of Smithtown — cape cods, farmhouse-style homes, and early-postwar colonials dating to the 1940s. Many Saint James properties have board sheathing that was original to the house and has never been replaced. We inspect it on every tear-off and price replacement transparently. Saint James premium home values also support designer shingles and standing seam metal — both of which we regularly quote in this neighborhood.

Nissequogue and Head of the Harbor. These incorporated villages have their own distinct character — large lots, significant setbacks, and high-value properties. Head of the Harbor in particular has a significant concentration of waterfront estates. Nissequogue homeowners frequently request copper detailing and higher-end material specifications. Both villages have architectural review standards that are less formal than a traditional historic district but still present — we factor this into material recommendations.

HOA and covenant considerations. Several Smithtown-area planned developments — including parts of Nesconset and the neighborhoods around Kings Park — include deed covenants or homeowners associations with exterior modification provisions. Common restrictions in these areas include approved shingle color palettes, prohibition on rooftop equipment visible from the street, and requirements to notify the HOA before commencing work. We review your deed and HOA documents on request before signing the contract.

NYS Building Code specifics for Smithtown roofing. All Smithtown roof replacements must comply with the New York State Residential Code as locally adopted. Key requirements: ice and water shield must extend a minimum of 24 inches past the interior wall line at all eaves (we install 36 inches on north-facing slopes in Kings Park and Nissequogue where ice dams are recurring); underlayment must be minimum 15-lb felt or synthetic equivalent; ridge ventilation must meet the 1:300 balanced intake/exhaust ratio. We exceed code minimums on every job.

The Town of Smithtown Building Department also covers Commack, which sits on the south side of Jericho Turnpike. If your property is near the Smithtown/Huntington border — particularly along Route 25A or in Kings Park — our Huntington roofing page covers the Town of Huntington permit process and material considerations for that jurisdiction.

Homeowners near the Smithtown/Nassau border — particularly in Nesconset or Hauppauge — sometimes fall under Nassau County building codes rather than Suffolk. Our Hicksville roofing page covers Nassau permit processes including the Town of Oyster Bay Building Department that governs many central Nassau addresses.

For real 2026 pricing data on every roof type across Long Island, read our roof replacement cost guide. It includes actual job costs from Smithtown, Kings Park, and Saint James — not national averages.

Visit our Long Island roofing homepage to learn more about our GAF Master Elite certification, crew, and full project gallery spanning Nassau and Suffolk Counties.