Custom fabrication · Alpine Citadel

Custom Steel Enclosures, Built to Your Design

Custom fabricated for any enclosure design. Send a drawing, a prototype detail or a sketch. We return a layout, bay schedule and engineering package in under one week.

Structural steel · Engineered to ASCE 7-22 for your site · Sealed calculations in all 50 states

Custom fabricated

What does "custom fabricated for any enclosure design" mean?

It means you start from your drawing, not from our catalog. Alpine takes the enclosure your architect or brand has drawn, in any footprint, height or gate arrangement, and builds it in structural steel. Standard parts are used where they fit. Custom options, engineered per project: spaced slats, perforated metal panels, embedded posts, custom post profiles, any angle, heights from 5 to 10 ft and any RAL color.

Aerial view of an L-shaped structural steel enclosure with two gates

What can Alpine custom fabricate?

Any enclosure or screen wall built from steel posts and infill: trash and recycling, compactor, tire storage, equipment yard, covered and multi-bay enclosures, and screen walls for mechanical, generator, transformer, utility, data center and BESS equipment. Layouts can use any angle, L-shapes, notches, interior partitions, double or multi-bay plans and corner-hinged gates.

Option
Standard
Custom (engineered per project)
Height
6 ft, 7 ft, 8 ft
5 ft to 10 ft; other heights by engineering
Layout
Solved to the architect's drawing; overall dimensions met within ±1 in
Any angle, L-shapes, notches, interior partitions, double and multi-bay enclosures
Bays (clear, post to post)
Standard set, 15–96 in
Non-standard widths
Infill
Solid steel tube slats, 0.79 × 3.15 in (20 × 80 mm), 100% opaque
Spaced slats (custom spacing for airflow or visibility); perforated metal panels
Posts
4 in square structural steel tube (HSS 4 × 4); 8 in round gate posts
Custom post profiles and sizes
Mounting
Base-plated on a concrete slab, ¾ in hot-dip galvanized plates
Embedded posts
Gates
12 ft or 16 ft clear, double leaf, swing out
20 ft clear double leaf; 6 ft single leaf; corner-hinged gates; multiple gates per enclosure
Finish
Galvanized steel, powder coated to Qualicoat standards
Any RAL color; full hot-dip galvanized posts based on site location and exposure
Options
—
Bollards; covered (steel-roofed) enclosures; pedestrian gates
Delivery
One kit per enclosure, tagged by bay
Program kitting by site and release
The process

From your drawing to a kit on the slab

Six steps, one supplier. The layout, bay schedule and engineering package come back in under one week; the submittal follows for the architect and building department; the kit ships tagged by bay and installs in typically 1–2 days.

Step 1
Send your drawing

An architect's site plan or enclosure detail, a brand prototype drawing, or a dimensioned sketch, plus the site address.

Step 2
Layout and bay schedule

Bays, gates and partitions fitted to your dimensions, overall dimensions within ±1 in, with a plan drawing.

Step 3
Engineering package

Structural calculations to ASCE 7-22, anchorage design, slab and base-plate requirements; sealed where the jurisdiction requires it. Under one week.

Step 4
Submittal package

After you approve the layout: drawings, product data, calculations and finish specification for the architect and building department.

Step 5
Kit ships tagged by bay

One kit per enclosure, hardware packed with 10% extra, spare slats, a packing list and a layout drawing.

Step 6
Install in typically 1–2 days

Posts bolt to base plates on the prepared slab; solid slats slide in captive; gates arrive function-tested.

What to send

What do I need to send you?

Send whatever defines the enclosure today: an architect's site plan or enclosure detail, a brand prototype drawing, or a dimensioned sketch. Add the site address so we can look up wind speed and exposure, the containers or equipment being enclosed, the height you need, and any local code or hauler requirements you already know.

  • Files we accept: PDF, DWG, DXF, and photos or scans of a sketch (JPG, PNG).
  • Helpful but optional: container count and size, gate swing direction, slab status (new or existing), finish color.
  • Not needed yet: a structural design. That is part of what we deliver.
What you get back

What do you send back, and how fast?

In under one week you receive a layout solved to your dimensions, a bay schedule, a plan drawing and the engineering package: structural calculations, anchorage design, and slab and base-plate requirements. Sealed calculations are available in all 50 states, so the package is ready for your architect's submittal and the building department.

Sample enclosure layout with bay schedule
Deliverable
What it shows
Layout solve
Bays, gates and partitions fitted to your dimensions, overall dimensions within ±1 in
Bay schedule
Every bay by clear width, so posts, slats and gates match the plan
Plan drawing
The enclosure as it will be built, with gate positions and swing
Engineering package
Structural calculations to ASCE 7-22, anchorage design, slab and base-plate requirements; sealed where the jurisdiction requires it

How do custom options affect the engineering?

Every custom item is engineered for the project. Height, bay width, infill, post profile, mounting and gate size all change the loads on posts, plates, anchors and slab, so the engineering package covers the configuration you choose at your site's wind speed, exposure and risk category. Spaced slats and perforated panels also reduce wind load. The project engineer designs the slab; Alpine provides the slab and base-plate requirements.

How we engineer each site

Can you match a building, a brand prototype or a local code?

Yes. Choose any RAL color to match the building or brand standard. Where a code names masonry, Alpine provides an alternate-materials submittal with sealed calculations and a building-matched finish. Heights from 5 ft to 10 ft cover a wide range of local limits, and 20 ft clear gates are available for tire yards under IFC §3407.2.

Does a custom enclosure cost more than a standard one?

Standard sizes carry published ranges. Typical installed cost for an 8 ft Alpine Citadel enclosure, excluding slab and site work, is $15,000–20,000 for a single and $21,000–30,000 for a double, including the engineering package for standard sizes. Program pricing for multi-site rollouts is available on request. Custom enclosures and non-standard engineering are quoted per project. Custom prices come from the solved layout, so the effect of each option, such as a taller wall or a wider gate, is visible before you commit.

What happens after the layout is approved?

After you approve the layout, Alpine issues the submittal package for the architect and building department: drawings, product data, calculations and finish specification. Each enclosure then ships as one kit with parts tagged by bay, hardware packed with 10% extra, spare slats, a packing list and a layout drawing, and installs in typically 1–2 days.

Custom configurations we engineer

  • Double enclosure with one wide opening. Some jurisdictions prohibit center posts; the opening is designed per project.
  • Tire storage enclosure with a 20 ft clear gate. For outdoor tire storage over 20,000 ft³, IFC §3407.2 calls for a fence at least 6 ft high with gates at least 20 ft wide.
  • Corner-hinged gates where a tight site leaves no room for a centered gate.
  • Screen walls with spaced slats or perforated metal panels around equipment that needs airflow.
  • Covered, steel-roofed enclosures where the jurisdiction or the owner wants a roof.
  • Interior partitions that separate trash, recycling and carts inside one enclosure.
Tire storage enclosure interior with bollards, structural steel slats

Interior partitions, corner-hinged gates and bollards are routine custom work, engineered per project.

Downloads

Downloads to start from

Start from the data sheet and standard-size sheets; CAD details and the sample submittal package are sent after a short form.

Download
Format
Access
Alpine Citadel product data sheet (AES-CIT-DS-01)
PDF
Open download
Standard-size sheets: single, single wide, double at 6, 7 and 8 ft
PDF
Open download
CAD details: plan, elevation, gate, base plate, embedded post, slab
DWG + PDF
By form
Sample submittal package
PDF
By form

Custom fabrication questions

Can Alpine build an enclosure with angles other than 90 degrees?
Yes. Custom layouts can use any angle, as well as L-shapes, notches, interior partitions and double or multi-bay plans. The layout is solved to your drawing with overall dimensions met within ±1 in, and each custom configuration is engineered for the project before anything is fabricated.
What file types can I upload?
Upload PDF, DWG or DXF drawings, or JPG and PNG photos of a sketch. A dimensioned sketch is enough to start. Include the site address so we can look up the wind speed and exposure category, and tell us the containers or equipment the enclosure has to hold or screen.
Can you build enclosures taller than 8 ft?
Yes. Alpine builds from 5 ft to 10 ft, and other heights are available by engineering. Taller walls carry higher wind loads, so the posts, anchors and slab requirements are checked for your site. IBC §105.2 exempts fences up to 7 ft from a building permit, so 8 ft and taller enclosures usually need one; sealed calculations support that permit.
Can we have a double enclosure without a center post?
Yes. The standard double uses two 12 ft clear gates on a shared center post, but some jurisdictions prohibit center posts. In that case Alpine designs the double with one wide opening as a custom project, engineered for the gate span and the site's wind loads.
Do custom enclosures come with sealed calculations?
Yes. Every project, standard or custom, is designed to ASCE 7-22 and checked for its own wind speed, exposure category, risk category, height, anchor type and foundation. Sealed calculations are available in all 50 states, and the engineering package is delivered in under one week.
Can a custom design become our standard for many sites?
Yes. A custom enclosure can become your program standard: one detail in the prototype drawings, adapted site by site for layout, engineering and submittal, and kitted by site and release. Programs get one price nationwide. See National programs for how multi-site rollouts work.
Send any enclosure design

Send any enclosure design. We return a layout, bay schedule and engineering package in under one week.

A drawing, a prototype detail or a sketch is enough to start.