Shop Drawing Approval for Custom Iron Doors: A Practical Guide

Why the Shop Drawing Matters Before Production

A shop drawing is the factory's detailed plan for your door. It shows the opening size, the frame and leaf profiles, the position of hinges and locks, the glazing or panel layout if any, and the chosen finish. Once you approve it, our team builds exactly what is drawn.

Because iron and aluminum doors are made to measure, a mistake on paper is much easier to fix than a mistake in steel. That is why we treat this step as the most important check in the whole project.

What to Check on the Drawing

Before signing, review the drawing against the site conditions and the design intent. Focus on the points below.

• Overall opening width and height, and whether they match the on-site measurement
• Swing direction, handing and the side the handle sits on
• Hinge and lock positions, including any electric strike or access control cable route
• Profile type and thickness, and the infill or glass specification
• Finish: hot-dip galvanizing and powder coat color, with the RAL or sample reference

Measurement Before the Drawing

Our drawing starts with an on-site measurement, not with the architectural plan alone. Walls are rarely perfectly square or plumb, and finished floor levels often differ from the structural drawings. We measure the opening at several heights and widths and note any out-of-square condition.

If the measured opening differs from the plan, the drawing will show the measured dimensions and clearly flag the difference so you can decide how it is handled before production starts.

From Drawing to Written Specification

Along with the drawing, you receive a written specification. It lists materials, profile references, fixings, hardware, finish and any items supplied by others, such as the lock or the electrical connection. Read this document together with the drawing, since the two must agree.

If anything is unclear, ask for a revision now. Changes made at the drawing stage cost time, while changes after cutting cost material and delay the schedule.

Production, Finishing and Client Approval

After you approve the drawing and specification in writing, the door moves to production in our factory. Components are cut, welded and assembled, then finished by hot-dip galvanizing where corrosion protection is needed, followed by powder coating in the chosen color.

We recommend a final check of the color sample against the approved reference before finishing begins, because the same RAL code can look slightly different on different surfaces.

Installation and Handover

On installation day, the door is fixed to the prepared opening, aligned, and checked for swing, gap and lock function. Confirm that the installed result matches the approved drawing and that any electrical or access items work as specified.

• Check plumb, level and swing before the fixings are finished
• Confirm lock, closer and any electric items operate correctly
• Record any snag on the handover sheet and agree how it will be resolved

Frequently asked questions

Do I have to approve the shop drawing in writing?

Yes, we recommend written approval, such as a signed copy or an email confirmation. This creates a clear record of the agreed dimensions, finish and hardware before production begins.

Can I change dimensions after I approve the drawing?

Changes are possible but may require a revised drawing and can affect the schedule and material already prepared. The earlier a change is raised, the simpler it is to handle.

Who is responsible if the site opening is different from the plan?

Our on-site measurement is used for the drawing, and any difference from the plan is flagged on the drawing. Agree on the measured dimensions before you approve.

Should I check the color before approving the finish?

Yes, always confirm the color against a sample or reference code, since the same code can appear differently on different surfaces and finishes.

Common mistakes to avoid

The most common mistake is approving a drawing without checking the swing direction, handing and hardware positions. Skipping the comparison with the on-site measurement can also lead to a door that fits the plan but not the actual wall.

Our recommendation

Mark the swing, handle side and lock positions on a printed copy of the drawing and check them against the real opening before you sign. Taking five minutes at this stage saves days at installation.

Summary

Approving the shop drawing carefully, with the on-site measurement and written specification in hand, is the surest way to get a custom iron or aluminum door that fits and works from the first day.

Related guides

• From Quote to Order: Our Door Ordering Process Explained
• How We Review Your Door Drawings Before Production Begins
• How Metal Doors Are Cut and Prepared in Our Workshop
• Planning Glazing Openings in Aluminum Doors
• Welding and Assembly Steps in Iron Door Manufacturing
• Designing Security Door Panels: Infill and Pattern Options
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