What Issued For Construction Means On Engineering Drawings

"Issued for construction" on an engineering drawing means the engineer has released that revision to be built from. Every issue before it, whether marked preliminary, for coordination, for approval or for tender, was produced for a different job, and none of them is a licence to pour concrete.

The status sits in the title block, usually beside the revision mark. It is a small piece of text that decides a lot of money.

What each status is for

Preliminary. Early drawings that let the architect and the other consultants see where the structure is heading, and they change as the design settles.

For coordination. Drawings issued so the services, architectural and civil designs can be checked against the structure, which is where penetrations, set-downs and level changes get settled.

For development application. The drawings that support the DA, showing the engineering at the level of detail the council needs to assess it.

For construction certificate. The set that goes to the certifier, detailed enough to show that the building complies.

For tender. Drawings released so builders and subcontractors can price the work. A tender set can still be missing late changes, because its job is a price rather than a pour.

For construction. The revision the site builds from, released once the design and the coordination are complete.

Not every job uses every status, and different offices use slightly different names. The principle holds either way, because the status tells you what that sheet is allowed to be used for.

Revision letters and numbers

Every time a sheet changes, it gets a new revision, recorded in the table in the title block with a date and a short description. A common convention runs letters through the design issues, A, B, C and so on, then switches to numbers at the construction issue, so revision 0 is the first one the site builds from.

Changes on a new revision are usually marked with a cloud drawn around them and a small triangle carrying the revision mark. The cloud shows what changed this time, and it doesn't show what changed last time, which is why the revision table matters as much as the drawing.

The register and the transmittal

A drawing set for a mid-rise building runs to a lot of sheets, and they don't all move together. The structural plans for one basement level can be on revision 3 while the shoring drawings are still on revision 1.

The drawing register lists every sheet with its current revision and status. A transmittal records what was sent, to whom and when. Between them, they answer the only question that matters on site, which is whether the sheet in your hand is the current one.

How sites end up on a superseded sheet

It is rarely carelessness. A foreman prints the set, a revision lands a few days later, and the printed copy in the site shed stays the same. Or a subcontractor works from the tender set they priced, because nobody sent them the construction issue.

The fix is boring and it works. The site keeps one controlled set, superseded sheets get stamped and pulled, and every revision is acknowledged by the people building from it. When a question comes up, the [RFI](/blog/construction-rfis-and-how-engineers-answer-them) gets answered on the drawing as a revision, not left sitting in an email chain.

Shop drawings

Steel fabricators, precast suppliers and PT contractors each turn the engineer's design into their own production details. We review those shop drawings against the design intent, but they don't replace the structural drawings, and a review stamp on a shop drawing doesn't change what the structural set says. The steel side is covered in [steel connections and shop drawings](/blog/steel-connection-design-and-shop-drawings).

Changes after the construction issue

A construction issue isn't frozen. Site conditions, authority comments and client changes all produce new revisions after it, and each one goes through the same review as the first issue did.

What changes is the weight of each revision. Concrete already poured can't be redrawn, so a late change has to be checked against what has been built, and the question of who carries it is set out in [who is responsible when a design changes on site](/blog/who-is-responsible-when-a-design-changes-on-site).

How we approach it

Before a set leaves our office as issued for construction, our drafting manager and a senior engineer review it against the design and the other consultants' drawings, and check any [by-others gaps](/blog/what-by-others-means-on-engineering-drawings) still to close. Every revision after that is dated, described and logged on the drawing register.

Every pour on site should start with one plain question, which is whether this sheet is the current revision.

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