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Polycarbonate Roof Cost Calculator

Estimate 2026 US polycarbonate roof cost for patio covers, pergolas, carports and sunrooms by sheet type (corrugated, solid, twin-wall, multi-wall 16/25 mm), tint, glazing-bar length, subframe and access. Modelled around Palram Suntuf, Palruf, Sunlite, Polygal Thermoclear and Marlon ST.

Polycarbonate Roof Cost Calculator

Estimate 2026 US polycarbonate patio cover, pergola and carport roof cost by sheet type (corrugated, solid, twin-wall, multi-wall 16/25 mm), tint, glazing-bar length, perimeter trim, subframe, storey and access. Modelled around Palram Suntuf, Palruf, Sunlite, Polygal Thermoclear and Marlon ST products.

Estimated polycarbonate roof cost
$6,372
Range: $5,416 – $7,646
sheet + glazing bars + perimeter trim + subframe + tear-off + permit + disposal
Sheet
$2,970
Glazing bars
$1,188
Perimeter trim
$594
Subframe
$990
Tear-off
$0
Permit
$250
Disposal
$380

What this calculator estimates

This calculator quotes the all-in installed cost for a 2026 US polycarbonate roof — for patio covers, pergolas, carports, lean-to extensions, sunrooms and conservatory roofs. It separates the bill into the line items polycarbonate-trained installers actually invoice:

  • Sheet cost — Palram Suntuf, Palruf, Sunlite, Polygal Thermoclear or Marlon ST sheet priced per square foot, scaled by sheet type (corrugated / solid / twin-wall / multi-wall), tint, storey and access.
  • Glazing bars — aluminium snap-cap rafter bars priced per linear foot, the structural backbone that holds multi-wall and twin-wall sheets in place.
  • Perimeter trim — F-section side closures, ridge cappings, end caps and breather tape per linear foot.
  • Subframe — timber rafters or aluminium framing per square foot (sometimes the existing patio structure serves as the subframe).
  • Tear-off — removing the existing patio roof if any.
  • Permit — typical municipal building permit fee for residential patio cover.
  • Disposal — debris haul-away and dump fee.
  • Weekend / after-hours premium — 25% surcharge for night, weekend, or expedited schedules.

A minimum mobilisation charge of $1,650 applies in most US metro markets — the labour cost of mobilising a polycarbonate-trained crew, the cut-to-size logistics and the cap-flashing labour at the wall-to-roof transition dominate small jobs.

How to use it

  1. Measure the roof area in square feet. For a patio cover, measure the outer footprint (eave-to-eave × ridge-to-eave). A 10×20 ft patio cover is 200 sq ft.
  2. Pick a sheet type — corrugated for the budget end (single-layer wave profile, $4-6/sq ft material), twin-wall 6 mm for thermal-performance budget builds, multi-wall 16 mm for premium patio covers and small conservatories, multi-wall 25 mm for full sunrooms.
  3. Pick a tint — clear (89% light transmission, highest passive solar gain), opal (diffused, lights the space evenly without glare), bronze (smoke-tinted, reduces solar gain by 25-35%), solar-control IR coating (rejects 65-80% of solar heat while keeping 50-60% light transmission, +18% sheet cost).
  4. Set storey count — single-storey for ground-level patio covers, two-storey for upper-floor balcony covers, three-storey for high-rise rooftop installations.
  5. Pick access — easy is ground-level patio with ladder access, moderate is single-storey ridge with scaffold ladder, hard is multi-storey or rooftop installation requiring a lift.
  6. Set glazing-bar length in linear feet. For multi-wall and twin-wall sheets, plan one aluminium snap-cap bar per sheet width seam (typical sheet is 4 ft wide, so a 20 ft wide patio cover needs 5-6 bars × 10 ft each = 50-60 lf).
  7. Set perimeter trim length in linear feet. Measure the outside edge of the roof plus the wall-flashing line.
  8. Toggle subframe — ON if building new framing, OFF if installing over an existing patio frame.
  9. Toggle tear-off — ON if replacing a failed existing patio roof.
  10. Toggle add-ons — permit, disposal, weekend premium.

Typical 2026 US polycarbonate roof cost ranges

These reflect 2026 nationwide pricing from Palram, Brett Martin and Polygal installer surveys, RSMeans 2026 Building Construction Cost Data, HomeAdvisor 2026 Patio Cover Cost Report and Q1 2026 contractor quotes.

Scope (clear, single-storey, moderate access, with subframe, 60 lf bars and 60 lf trim)2026 installed price
100 sq ft pergola (corrugated)$1,650 – $2,400
200 sq ft patio cover (twin-wall 10 mm)$3,400 – $5,200
200 sq ft patio cover (multi-wall 16 mm)$4,200 – $6,800
400 sq ft carport (multi-wall 16 mm)$7,500 – $11,500
600 sq ft sunroom (multi-wall 25 mm)$14,500 – $22,000
Corrugated polycarbonate, installed$6 – $11 / sq ft
Twin-wall 6 mm, installed$9 – $13 / sq ft
Twin-wall 10 mm, installed$12 – $18 / sq ft
Multi-wall 16 mm, installed$16 – $26 / sq ft
Multi-wall 25 mm, installed$21 – $32 / sq ft
Solid 6 mm polycarbonate, installed$11 – $18 / sq ft
Aluminium snap-cap glazing bar$18 / lf
F-section perimeter / end-cap / breather tape$9 / lf
Timber or steel subframe addition$4.50 / sq ft
Bronze / smoke tint uplift+8% sheet cost
Solar-control IR coating uplift+18% sheet cost

Add 15% for two-storey access, 35% for three-storey or higher, and 10-30% for difficult access (lift required, restricted yard).

Cost drivers

Sheet type. The dominant variable. Corrugated polycarbonate at $4-6 per sq ft installed is the budget benchmark — the wave profile self-drains, the sheet self-supports across 24-in rafter spacing, and the screw-down install is fast. Twin-wall at 6 mm doubles the thermal performance and adds $3-5/sq ft. Multi-wall at 16 mm triples thermal performance and adds $7-12/sq ft over corrugated. Multi-wall 25 mm five-wall is the premium spec for sunrooms at $15-20/sq ft over corrugated.

Glazing-bar system. Multi-wall and twin-wall sheets must be installed with an aluminium snap-cap glazing bar that seals the sheet edge while accommodating thermal expansion (polycarbonate expands 0.065 mm per metre per °C — a 4 m sheet moves 7-9 mm between -20 °C winter and +60 °C summer surface temperature). Snap-cap bars run $14-22 per linear foot installed. Skipping the snap-cap system and using exposed screws through the sheet face voids the manufacturer warranty.

Perimeter trim and breather tape. Every multi-wall sheet edge must be sealed against insects and water — the open ends of the internal flutes are sealed at the bottom with adhesive aluminium tape (allowing condensation to escape downward) and at the top with vapour-tight aluminium tape (preventing water entry). The exposed long edges are capped with F-section trim. Plan $7-12 per linear foot all-in.

Subframe. A timber rafter subframe at 4-ft centres runs $3.50-$5.50 per sq ft. An aluminium subframe (popular for retrofit-over-concrete-patio installations) runs $6-9 per sq ft. Steel subframes (for snow-load regions or large spans over 16 ft) run $8-12 per sq ft.

Tint. Clear sheet has the highest light transmission (89% for solid 6 mm, 80-83% for twin-wall). Opal/diffused sheet glazing scatters direct sun and eliminates hotspots, with 7-15% light transmission loss; +6% sheet cost. Bronze smoke tint blocks 25-35% solar gain at the cost of 20% light transmission; +8%. Solar-control IR coating (Palram SunSky Solar Smart, Polygal Solar Control) rejects 65-80% of solar heat while keeping 50-60% visible light; +18%. For hot southern climates (Phoenix, Tucson, Las Vegas), solar-control or bronze is recommended.

Building height and access. Single-storey ground-level patio installs are baseline. Two-storey work adds 15% for ladder rigging. Three-storey or higher requires scissor lift or boom lift rental ($350-$750/day) plus rigging crew.

Per-locale code and standards (US)

  • IRC R301.5 / R301.6 — Permitted use of plastic glazing in residential roofs, including R-value relaxation for unheated sunrooms and conservatories.
  • IBC 2606 — Plastic glazing approval (light transmission, fire classification, area limitations, height limitations).
  • IBC 1505 / ASTM D635 — Fire classification (CC1 flame spread) for polycarbonate sheet.
  • IECC C402.4 (2024) — Minimum R-value for above-deck insulation in conditioned spaces.
  • ASCE 7-22 Chapter 30 — Wind-load design for roof components and cladding (sheet pull-off, fastener spacing).
  • Miami-Dade NOA / Florida Product Approval — Mandatory for any sheet installed in Florida HVHZ counties (Miami-Dade, Broward).
  • ASTM E330 — Standard test method for structural performance of exterior windows, doors, skylights and curtain walls by uniform static air-pressure difference (used to certify polycarbonate sheet to design wind load).
  • ASTM D635 — Standard test method for rate of burning of self-supporting plastics in a horizontal position.
  • ASTM D1929 — Standard test method for ignition properties of plastics.
  • Underwriters Laboratories UL 263 — Fire-resistance tests for building construction and materials (when polycarbonate is incorporated into a fire-rated assembly).
  • OSHA 29 CFR 1926.501 — Fall protection requirements for any work surface above 6 feet.

Diagnostic step-by-step

  1. Check the UV-protection layer — premium polycarbonate has a factory co-extruded UV-resistant layer on one face only. The manufacturer’s label or sticker tells you which side faces up. Installing the sheet upside-down voids the warranty and the sheet will yellow in 3-5 years instead of 15.
  2. Inspect glazing bars for movement gaps — polycarbonate must be free to expand and contract. The aluminium snap-cap bar holds the sheet edge but should not pinch it; fastener slots are oversized to allow movement.
  3. Inspect breather-tape installation — the top edge of each sheet must be sealed vapour-tight and the bottom edge sealed with porous foil tape (allowing condensation to escape downward). Wrong-side installation traps moisture inside the flutes and grows algae.
  4. Check rafter spacing against the sheet specification — 6 mm twin-wall typically allows 600 mm rafter spacing; 16 mm multi-wall allows 1,000 mm; 25 mm allows 1,200 mm. Wider spacing causes sheet sag and water ponding.
  5. Check the minimum roof pitch — polycarbonate self-supports from 5° (1:12) minimum pitch. Below this, the sheet will pond water at the lower screws and seep through over time.
  6. Check fastener spacing and rubber-washer condition — screws should be spaced 400-500 mm along the rafter, with EPDM rubber washers under each head to seal the hole. Over-tightened screws crack the sheet at the hole, under-tightened screws leak.
  7. Verify drainage at the lower edge — the sheet flutes must drain freely at the lower edge. A blocked F-section or perimeter gutter causes water to back up into the flutes and trap moisture.

Avoiding scams and overcharging

Residential patio cover installs are a frequent target for low-spec contracting:

  • Quotes that use exposed screws through the sheet face (instead of snap-cap glazing bars) — voids warranty.
  • Quotes that omit aluminium breather tape — guaranteed algae growth and condensation problems within 2 years.
  • Quotes that use generic polycarbonate without a co-extruded UV layer — yellowing in 3-5 years instead of 15-20.
  • Quotes that install with the UV layer facing down — invisible until it’s too late.
  • Quotes that skip the wall-flashing line at the house-to-cover transition.
  • Quotes that omit drip-edge metal at the eave — water blows back under the sheet.
  • Quotes that use the wrong fastener (drywall screws, deck screws, generic gasketed screws) — all leak within 5 years.

Insist on an itemised quote that explicitly lists the sheet manufacturer and product number, the UV-layer warranty term, glazing-bar manufacturer and product, breather tape part number, fastener manufacturer and EPDM washer rating, and a written 10-year leak warranty. Check the contractor’s license and insurance through your state’s licensing board. For attached patio covers, confirm the house attachment will be flashed and integrated with the existing roof — the wall-to-cover transition is the #1 failure point in polycarbonate installs.

Sources: Palram 2026 Installer Price List; Brett Martin Marlon ST Technical Manual; Polygal Thermoclear Specifier Guide; Suntuf / Sunlite installation manuals; HomeAdvisor 2026 Patio Cover Cost Report; HomeGuide Polycarbonate Roofing Survey; RSMeans 2026 Building Construction Cost Data; IRC 2024 R301.5; IBC 2024 Chapter 26 (Plastic); IECC C402.4 (2024); ASCE 7-22 Chapter 30; ASTM D635, D1929, E330; Miami-Dade NOA database; OSHA 29 CFR 1926.501.

Frequently asked questions

How much does a polycarbonate roof cost per square foot in 2026?
Most US polycarbonate patio covers, pergolas and carports installed in 2026 price between $9 and $24 per square foot all-in for the sheet, glazing bars, perimeter trim, aluminium snap-cap rafters and a timber or steel subframe. Corrugated polycarbonate (Palram Suntuf, Palruf 0.8 mm) is the budget option at $7-12 per sq ft installed. Twin-wall 6 mm runs $10-14, twin-wall 10 mm $13-18, multi-wall 16 mm $17-26 and heavy-duty 25 mm five-wall $22-32. A typical 200 sq ft patio cover in 16 mm multi-wall clear with an aluminium subframe ranges $4,200-$6,800 installed in 2026. Source: Q1 2026 contractor quotes from Phoenix, Dallas, Atlanta, Tampa, Los Angeles, San Diego, Las Vegas and Houston metros; HomeAdvisor 2026 Patio Cover Cost Report; HomeGuide Polycarbonate Roofing Survey; Palram 2026 installer price list.
Twin-wall vs multi-wall vs corrugated polycarbonate — which one do I need?
Corrugated polycarbonate (single-layer wave-profile sheet, 0.8 mm thick, sold as Palram Suntuf or Palruf) is the cheapest and easiest to install — fastens directly onto timber purlins at 24 in centres with screw-down rubber-washer fixings. It's perfect for budget patio covers, pergolas, sheds and chicken coops where insulation is not a priority. It has low R-value (R-0.6), so the space underneath gets hot in summer. Twin-wall polycarbonate (two parallel sheets separated by internal ribs creating an air chamber, 6-10 mm thick) doubles the R-value to R-1.4-1.7 and lets less heat through. It needs an aluminium snap-cap glazing bar system for sealed installation. Multi-wall polycarbonate (three or more parallel sheets with internal X or honeycomb ribs, 16-25 mm thick) is the premium spec — R-2.1 to R-3.0, blocks 99.9% of UV, and is the only polycarbonate that meets IECC C402.4 for conditioned-space sunrooms. For an open patio cover, corrugated or twin-wall 6 mm is appropriate. For a sunroom enclosure or pool cover, multi-wall 16-25 mm is required.
Does polycarbonate roofing need a building permit?
In most US jurisdictions, yes — any roof structure over 200 sq ft, any attached structure (a patio cover bolted to the house), and any structure with electrical, plumbing or HVAC service requires a permit under IRC R105.2 and IBC Chapter 1. Free-standing pergolas under 200 sq ft and under 12 ft ridge height are typically permit-exempt in residential districts, but local rules vary — Phoenix requires permits for any structure over 120 sq ft, Los Angeles County requires permits for any attached structure regardless of area, and HOA review is required almost universally. Polycarbonate sheet itself is rated to ASTM D635 (CC1 flame classification) and satisfies IBC 2606 plastic-glazing requirements when installed in approved framing systems. Wind-load design must satisfy ASCE 7-22 Chapter 30 for components and cladding — for the Florida and Gulf Coast HVHZ zones (Miami-Dade, Broward), structural calculations from a Florida-registered PE are mandatory and the sheet must hold a Miami-Dade NOA (Notice of Acceptance).
How long does a polycarbonate roof last?
Service life depends on the sheet's UV-protective layer (a co-extruded outer layer that takes the brunt of UV degradation), the tint, the framing system, and the install quality. Premium multi-wall polycarbonate with factory-applied co-extruded UV layer (Palram Sunlite Solid, Polygal Thermoclear, Marlon ST Longlife) carries 10-year manufacturer warranties against yellowing and impact loss. Real-world service life is 15-25 years in northern US climates (Seattle, Boston, Minneapolis) and 12-18 years in high-UV southern climates (Phoenix, Tucson, El Paso) where the UV layer degrades faster. The most common failure mode is yellowing and brittleness on the upper surface after 12-15 years of full sun exposure, followed by panel cracking at the screw fastenings. Solar-control IR-coated panels (Palram SunSky Solar Smart, Polygal Solar Control) carry a 12-year warranty and add roughly 18% to the sheet cost but extend service life to 25+ years.
Can I use polycarbonate for a conservatory or sunroom roof?
Yes — 16 mm or 25 mm multi-wall polycarbonate is the dominant US conservatory roof material, used in roughly 60% of new sunroom installs according to NSRA 2025 data. It satisfies IECC C402.4 above-deck insulation when installed with thermal-break aluminium glazing bars and provides R-2.1-3.0. For sunrooms in IECC climate zones 5-8 (anywhere north of the Mason-Dixon line), the higher 25 mm five-wall spec is recommended to meet R-3.0+. Note that polycarbonate does NOT meet the higher R-value for fully-conditioned year-round living space (R-30 above deck in zone 5+) — IRC R301.5 permits conservatories and sunrooms as 'unheated accessory spaces' with relaxed insulation rules, but if you plan to heat the room year-round, the building official may require glass roof or insulated panel construction instead. Always check with your local building department before specifying.
What's the difference between solid and twin-wall polycarbonate?
Solid polycarbonate is a single dense layer (3-12 mm thick) with the highest light transmission (85-89% for clear 6 mm) and the highest impact resistance (Palram Sunlite Solid is rated to 250× the impact strength of glass at the same thickness). It is the premium option for skylights, security glazing and pool covers. Twin-wall polycarbonate is two parallel layers connected by internal ribs forming an air chamber, with 80-83% clear light transmission but 2-3× the thermal performance of solid for the same nominal thickness. Twin-wall is much lighter (a 6 mm twin-wall sheet weighs 1.3 kg/m² versus 7.2 kg/m² for solid 6 mm), which allows wider rafter spacing and lighter framing. For a patio cover or carport where light transmission and thermal performance matter, twin-wall is the better economic choice. For a security application or where impact resistance is critical (hail-prone regions, public buildings), solid is required.

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