DeckMath
5 US brands · AAMA 2604 30-yr powder · 5 styles × 6 colors · pre-cut stair kits

Aluminum Railing Calculator

Kit-system design tool for the 5 major US aluminum railing brands. Westbury (Digger Specialties — industry leader, broadest catalog with Veranda C10 classic + Tuscany C80 horizontal-rail + Riviera glass). AFCO (premium, custom-curved-rail capable, Provincial 200 + Pro 300). Fortress (Home Depot / Lowe's availability — Al13 Home + the unique Athens vertical-cable line). Key-Link (Lancaster PA — 30-yr AAMA 2604 super-durable powder coat, longest fade warranty in industry). Wolf RailRiser (dealer-direct, brand-matches Wolf Serenity PVC decks). 5 styles per brand (subject to availability): classic, horizontal cable, glass panel, vertical-cable (Fortress Athens exclusive), horizontal-rail (Westbury Tuscany exclusive). 6 powder colors with AAMA 2604 30-yr fade rating. Decorative post caps (solid $15 or lit LED $65).

5 brands5 styles × 6 colorsAAMA 2604 powder20-30 yr warrantyPre-cut stair kitsLit post capsFree forever
5 brands·Westbury · AFCO · Fortress · Key-Link · Wolf
30 yr·AAMA 2604 max fade
5 styles·Classic → glass
6 colors·Powder palette

Inputs

Linear feet + posts

ft

ft

ea

ea

ft

Total railing52 ft
Posts needed15

Install + region

Northeast · 1.22× labor

Westbury aluminum

52 ft · Classic (square balusters) · Textured Black · 20-yr AAMA 2604 powder

Installed total
$6,660 $8,040
at $154.6/lf installed · 15 posts
Textured Black20-yr warranty

Cost breakdown

Level kit (40 lf × $78/lf)$3,120
Stair kit (12 lf · +25% material)$1,170
Corner kit (×3)$525
Stair bracket kit (×1)$95
Post caps (solid × 15)$225
Materials subtotal$5,135
Labor (Northeast 1.22× · range)$2,010
Project total (high, +8% contingency)$8,040

Brand details

Brand
Westbury Aluminum Railing (Digger Specialties)
Retailer
Westbury Authorized Dealers + Wayfair
Lines
Veranda C10 · Tuscany C80 horizontal rail · Riviera glass panel
Stair cutting
Pre-cut to your rake angle
Unique feature
Industry's broadest style catalog · pre-cut stair kits
Warranty
20-yr AAMA 2604 powder coat

Industry leader. C10 Veranda classic profile is the volume bestseller. C80 Tuscany features horizontal aluminum rod infill (no balusters). Pre-cut stair kits delivered by the rake angle you specify.

IRC code references

  • IRC 2021 R312.1.1 — Guards required when deck > 30″ above grade
  • IRC 2021 R312.1.2 — Guard ≥ 36″ residential / ≥ 42″ commercial
  • IRC 2021 R312.1.3 — Baluster 4″ sphere rule (traditional balusters meet; horizontal cable systems require local AHJ approval)
  • IRC 2021 R301.5 — 200 lb concentrated load capacity at top of guard
  • AAMA 2604 — Super-durable polymer-coat fade specification (industry standard for aluminum railing finish)

How to use

Three steps. Permit-ready output.

  1. 01

    Enter geometry

    Level (deck-edge) LF + stair (raked) LF separately. Stair carries 25% material premium + 40% labor premium. Corner count (each adds $175 corner-fitting premium). Stair sections (each adds $95 transition brackets). Post spacing default 6 ft per IRC + most brand engineering manuals.

  2. 02

    Pick brand

    Westbury is the volume leader with widest style catalog. AFCO premium with curved-rail capability. Fortress for Home Depot / Lowe's pickup (Al13 Home) or vertical-cable Athens line. Key-Link for longest fade warranty (30 yr AAMA 2604). Wolf for matching Wolf Serenity decks.

  3. 03

    Pick style

    Classic (square balusters) 1.0× multiplier — workhorse. Cable 1.40× (horizontal stainless cables, specialty install). Glass 1.85× (12mm tempered panels, premium look). Vertical-cable 1.35× (Fortress Athens exclusive, sometimes R312.1.3-compliant where horizontal cable isn't). Horizontal-rail 1.20× (Westbury Tuscany exclusive). Auto-fallback to classic if brand doesn't carry your pick.

  4. 04

    Pick color + post caps

    6 powder colors with AAMA 2604 30-yr fade rating. Sand and almond carry 5% upcharge. Post caps: none (functional flat top), solid ($15/ea, decorative pyramid or ball), or lit LED ($65/ea, plus 12V transformer + cable run separate). Lit caps need solar OR wired low-voltage system.

  5. 05

    Pick install + state

    Contractor mode adds full labor at regional rate (NE 1.22× / W 1.28× / S 0.92× / MW 1.00×). DIY mode hides labor cost and shows opportunity cost at $35/hr default. Classic + horizontal-rail are DIY-friendly (click-together kits); cable + glass need specialty install regardless of brand.

How we calculate

The math, fully transparent.

The Aluminum Railing Calculator is the kit-system design tool covering the 5 major US aluminum railing brands: Westbury (Digger Specialties — industry leader, broadest catalog) · AFCO (premium, curved-rail capable) · Fortress (Home Depot / Lowe's availability, Al13 Home entry-tier + Athens vertical-cable line) · Key-Link (Lancaster PA, 30-yr AAMA 2604 super-durable powder coat — longest fade warranty in industry) · Wolf RailRiser (dealer-direct, brand-matches Wolf Serenity decks). 5 styles per brand subject to availability: classic (square balusters), cable (horizontal stainless), glass panel, vertical-cable (Fortress Athens exclusive), horizontal-rail (Westbury Tuscany exclusive). 6 powder colors with AAMA 2604 30-yr fade rating. Decorative post caps: solid color-matched ($15/ea) or lighted LED ($65/ea). Splits level + stair LF with 25% material + 40% labor stair premium. Auto-falls-back style + color if brand catalog doesn't support the pick.

IRC references

  • IRC 2021 R312.1.1 — Guards required when deck > 30″ above grade
  • IRC 2021 R312.1.2 — Guard ≥ 36″ residential / ≥ 42″ commercial
  • IRC 2021 R312.1.3 — 4″ sphere rule (traditional balusters); horizontal-cable styles need AHJ approval
  • IRC 2021 R301.5 — 200 lb concentrated load at top of guard
  • AAMA 2604 — Super-durable polymer-coat fade specification (30-yr industry standard)

2026-Q1 retail kit pricing — manufacturer-authorized dealer + Home Depot / Lowe's averages. Westbury $78/lf · AFCO $82 · Fortress $72 · Key-Link $80 · Wolf $75 (level classic baseline). Style multipliers: cable 1.40× / glass 1.85× / vertical-cable 1.35× / horizontal-rail 1.20×. 42″ guard adds 10% material vs 36″. Stair LF carries 25% material premium + 40% labor premium. Corner premium $175/corner × style multiplier. Stair bracket kit $95/section. Labor by style $22-58/lf × regional (NE 1.22× / W 1.28× / S 0.92× / MW 1.00×). AAMA 2604 powder-coat specification per AAMA standards body.

Kit cost per LF
adjusted_kit_per_lf = base_per_lf × style_mult × color_mult × height_mult

Brand base $/lf (Westbury $78, AFCO $82, Fortress $72, Key-Link $80, Wolf $75) × style multiplier (classic 1.00 → glass 1.85) × color multiplier (sand/almond 1.05) × height multiplier (42″ guard adds 10% material). Final figure ranges $72-180/lf retail kit pricing depending on choices.

Stair material premium
stair_kit = level_per_lf × 1.25 × stair_lf

Stair LF carries 25% material premium for pre-cut angle delivery (most aluminum railing manufacturers offer pre-cut stair kits by rake angle — Westbury, AFCO, Key-Link, Fortress all do). The 25% covers the cut-to-spec premium + extra factory time.

Labor premium for stairs
stair_labor = level_per_lf × 1.40 × stair_lf

Stair install hours are 40% longer per LF — bracket assembly + plumb at angles + return brackets + bottom-of-stair newel. Aluminum stair install runs $32-58/lf vs level $22-36/lf depending on style.

Corner premium
corner_cost = corners × $175 × style_mult

$175 base per corner — extra corner-fitting kit (90° miter + 2 short rail sections + corner post). Multiplied by style multiplier (cable/glass corners cost more). Example: 3 corners × $175 × 1.40 cable style = $735 corner premium.

Post count
posts = ceil(total_lf / 6) - 1 + 2 endpoints + corners + 2× stair_sections

Same formula as Railing Post calc — 6 ft default OC spacing. Each corner forces a post. Each stair section gets 2 dedicated posts. 50 ft + 3 corners + 1 stair = 8 - 1 + 2 + 3 + 2 = 14 posts. Aluminum posts are surface-mounted with brand-specific base brackets — no notching like wood posts.

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