Ask five suppliers to quote "a fiberglass window frame profile" and you will get five numbers spread across a 40% band — and no way to tell whether the spread is quality, margin, or scope. That opacity is not in anyone's long-term interest, least of all ours: an unexplained cheap quote wins orders that end in disputes, and an unexplained expensive quote loses orders it deserved. So here is how the per-meter price of a pultruded window profile is actually built, driver by driver.
1. Resin system — the biggest single lever
The matrix resin is the largest material-cost decision in the profile. **Polyester** is the economic baseline and fully adequate for most residential series. **Vinyl ester** adds roughly 10–25% at the profile level and buys better moisture cycling, temperature resistance, and long-term stability. **Polyurethane (GFRP-PU)** sits at the top of the range — the resin itself is the most expensive of the three and it requires dedicated closed-injection equipment — and buys the highest cross-fiber strength, thinner walls, and deep-cold toughness ([the full engineering case is here](/technology/polyurethane-pultrusion-windows)). When two quotes differ sharply, resin system is the first thing to check: they may simply not be quoting the same material.
2. Glass content and fiber architecture
More glass means more stiffness per section — and more cost, because glass loading also slows the line and demands tighter process control. Fiber architecture matters as much as quantity: a profile with multiaxial fabric layers for corner-screw retention costs more per meter than a roving-only lay-up of the same weight, and behaves differently in your fabrication line.
3. Section complexity and wall thickness
A three-chamber sash profile with co-pultruded gasket channels pulls slower and scraps higher than a plain rectangular tube — pull speed is production cost. Thinner walls (a GFRP-PU specialty) reduce material per meter but demand premium process control, so wall thickness cuts both ways in the price.
4. Die tooling and amortization — where MOQs come from
Every profile geometry needs its own pultrusion die (typically 3–6 weeks to fabricate). On a standing-die profile from the supplier's existing library, you pay no tooling. On a custom section, the die cost has to sit somewhere: either as a one-time tooling charge or amortized into the per-meter price with a minimum order quantity. This — not appetite for large orders — is why custom-section MOQs exist, and why the honest answer to "what is your MOQ?" is always "which section?"
5. Surface finish
Mill finish (resin-rich veil, unpainted) is the baseline. Architectural powder coating to **AAMA 2604 or 2605** in a custom RAL color adds a real increment — coating line time, masking, and the qualification overhead of the rating itself. Dark and metallic colors price above standard white/grey because of heat-buildup qualification and lower coating-line throughput.
6. Certification and testing overhead
A profile shipped with EN ISO 10077-2 thermal simulation data, batch mill certificates, and a PHI-certified system behind it carries the cost of maintaining that evidence — accredited-lab testing, certificate renewals, per-batch QC documentation. This is genuine value, not padding: it is precisely the evidence the [qualification checklist](/resources/blog/qualify-chinese-fiberglass-window-profile-supplier) demands. A quote that undercuts the market by skipping it is cheaper for a reason you will meet later.
7. Volume and scheduling
Pultrusion economics reward continuity: a standing order that keeps a die on the line prices below sporadic small runs of the same section, because die changeovers are dead line time. If your volumes are predictable, say so in the RFQ — scheduling certainty is worth real money to a manufacturer and much of it comes back to you.
8. Logistics terms — the quiet 15–30%
An EXW-factory price and a DDP-jobsite price are different products. Between them sit sea freight, insurance, customs classification (fiberglass profiles under HS 3925.20 / 7019 — [our tariff guide covers this](/resources/ddp-tariff-hs-code-guide)), import duty and VAT, and broker risk. A "cheaper" EXW quote routinely loses to a DDP quote once those are priced honestly — and the DDP quote tells you the supplier has done this route before.
So what does it cost?
Published catalog pricing for F1's fenestration profile range spans roughly **€8–110 per linear meter** — a deliberately wide band, because the eight drivers above interact. A 65-series polyester frame profile in mill finish and a 90-series GFRP-PU sash profile in dark AAMA 2605 powder coat are both "fiberglass window profiles," and they sit at opposite ends of that band on merit.
The practical takeaway for buyers: **make quotes decomposable.** Ask every supplier to state resin system, glass content, D3917 tolerance class, finish specification, tooling treatment, and incoterm on the quote itself. The 40% spread will collapse into an explainable comparison — and the suppliers who resist decomposing their number have answered a different question for you.
