Standard external

W40

A balanced profile that reads almost as slim as W20 but takes a 27mm insulated unit. Seventeen hot-rolled sections, classed heavy-duty, capable of tall and expansive openings. The default specification for new-build residential.

Tagline The everyday. Double-glazed.

Best for Residential, most external openings

Lead time 10–18 weeks

Specification

The fine print.

Profile depth42–47mm

SightlineStepped-leg, reads near-W20

GlazingDouble, up to 27mm IGU

Glazing — maximumUp to 27mm double glazed unit (insulating glass up to 30mm)

U-value1.0 W/m²K (27mm IGU)

Frame U-value (Uf)Frame heat transfer from >1.90 W/m²K

Wind loadUp to Class C5 — 2000 Pa

Max bar length5800mm

SizingTo drawings

Compatible styles

Build it in W40.

Fixed

Windows · Picture window. Maximum glass, no opening sash. 1–3 panes per unit.View →

Casement

Windows · Side-hung opening sash, hinge at jamb. Single or paired.View →

Awning

Windows · Top-hung, opens outward. Rain-tolerant. Pairs with fixed transoms.View →

Sliding

Windows · Horizontal track. 2 panels, one fixed one opening.View →

Single Hinged

Doors · One leaf, side-hung. Five style variants — differing pane configurations and lite layouts.View →

French

Doors · A pair of hinged leaves — “dual hinged”. Four style variants from full-glass to multi-lite.View →

Curve

Doors · Single or dual hinged with arched head — what aluminium can’t do. Style variants to drawings.View →

Pivot

Doors · Centrally-pivoted on bearings. Single, dual, or with transom + sidelight.View →

Sliding

Doors · Top-hung, bottom-guided. 2, 3 or 4 panels. We avoid bifold — sliding is more reliable.View →

Doors + Sidelights

Doors · A door framed by fixed sidelights and/or transom — a composed entry opening.View →

Window Wall

Partitions · Multi-bay glazed wall. Mullion grid to drawings.View →

Next step

Configure your W40 and price it.

Choose a style, size, glazing, finish and hardware — made-to-measure in 50mm increments. We respond with itemised pricing, by elevation.

Configure & request a quote → Quick enquiry Back to the range