Metalwork Change Order Process During Construction

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A metalwork change order is handled by stating the revision in writing, re-measuring affected elements on site, issuing an updated drawing and specification, and getting written approval before production starts. Changes made after fabrication has begun usually cost more in time and material, so the earlier a revision is raised, the smoother the process. Keeping one written record of every change protects the schedule and the budget for everyone involved.

Why a clear change order matters for metalwork

Architectural metalwork is made to measure, so a design revision affects more than a drawing. Railings, gates, window bars, steel stairs and glass partitions all depend on exact dimensions, fixing points and finishes. A change that is agreed verbally can be forgotten, and an element built to the old detail may have to be remade.

A written change order gives the architect, the contractor and the workshop one shared reference. It records what changed, why, and which drawing version replaces the previous one.

Step 1: Raise the change in writing

The change request should come from the architect, designer or contractor and name the element, the drawing reference and the reason for the revision. Photos, marked-up plans or a short sketch help a great deal.

Element or location affected
Current drawing version and the requested change
Required date and any site constraints

Requests sent by message or email are easier to trace than comments made during a site walk.

Step 2: Re-measure on site

When a change touches an opening, a balcony edge or a wall fixing, the workshop needs to measure again. Walls are rarely perfectly straight or level, and finished plaster or tile can shift the true dimensions. Measuring the actual condition rather than relying on the original plan prevents misfit parts.

Where a structural fixing is involved, confirm the anchoring method with the engineer. Exact load and fixing values should always come from the engineer, not from the metalwork drawing alone.

Step 3: Updated drawing and written specification

After measurement, a revised drawing and specification are prepared. They should show the new dimensions, profile or section sizes, finish, fixing details and any interface with other trades, such as glazing or waterproofing.

Mark the revision clearly, for example Rev. B with the date, and withdraw the earlier version from circulation so that no one builds from an outdated sheet.

Step 4: Client approval before production

Production should start only after the revised drawing is approved in writing by the responsible party. This approval closes the change order. It also clarifies who carries any effect the change has on schedule.

Written approval of the revised drawing
Confirmed delivery and installation dates
Notes on any open items that need decisions

Step 5: Production, finishing and installation

In the workshop, the approved drawing is turned into cut lists, welded assemblies and finishing batches. Hot-dip galvanizing or powder coating is planned after fabrication, so any change in size or detail must be confirmed before the piece goes to finishing, as later corrections are difficult.

On installation day, the installed item should match the latest approved revision. Keep the signed drawings on file so that the final record matches what was built.

Frequently asked questions

Who approves a metalwork change order?

The responsible party named in the contract, usually the architect, designer or contractor, approves the revised drawing in writing. Production should wait for that approval.

Can a change be made after production has started?

It is possible, but it often means reworking or remaking parts and can extend the schedule. Raising changes early keeps the cost and delay low.

Is a site re-measurement always needed?

Re-measuring is strongly recommended whenever a change affects openings, edges or fixing points, because finished walls rarely match the original plan exactly.

What should the change order include?

It should include the element affected, the drawing reference and new revision, the reason for the change, the measured dimensions and the approval signature with date.

Common mistakes to avoid

Agreeing to changes by phone or during a site visit without a written revision is the most common error. Building from an outdated drawing version also causes parts to be rejected at installation.

Our recommendation

Assign one person to own the change log for each project and require a dated, signed drawing revision before any change goes into the workshop. Ask the engineer to confirm fixings whenever a structural interface is involved.

Summary

A good metalwork change order records the request, re-measures on site, issues a revised drawing, gets written approval and only then moves to production and installation.

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