What is the best way to communicate schedule updates to general contractors?

The best way to communicate a schedule change to a general contractor is early, in writing, and specific: what is changing, why, the new dates, and what you need from them. Send it to the project manager and the superintendent as soon as you know, and bring it up at the next coordination meeting as well. A GC can manage almost any delay they hear about in time. The one that hurts you is the one they discover.

What a general contractor needs from you

Their schedule is a chain of trades. They are asking four things:

1. Is your date still good?
2. If not, what is the new date?
3. Why?
4. What are you doing about it, and what do you need?

An update that answers those four in five lines is more useful than a phone call, and unlike the phone call it still exists next month.

Put it in writing

A phone call or a word on site is fine as a heads-up. Follow it the same day with an email that restates it. There are two reasons. People remember conversations differently. And your subcontract almost certainly requires written notice, within a set number of days, for any delay you may later want time or money for.

A format that works

Subject: Level 3 rough-in, new completion date March 14 (was March 10)

• What changed: Level 3 rough-in will finish March 14, not March 10.
• Why: Rooms 301 to 312 were not released to us until March 4. The framing inspection failed on February 28.
• Effect: Our rough inspection moves to March 15. Level 3 trim is not affected if drywall holds its dates.
• What we need: Confirmation that rooms 313 to 320 will be released by March 8.
• What we are doing: Adding two people on March 9 through 11.

It is short, factual, and has no blame in it. The cause is stated as a fact with a date.

Separate your delays from theirs

If the slip is yours (a short crew, late material you ordered), say so plainly and give the recovery plan. Credibility on your own delays is what makes your notices about theirs believed.

If the cause is not yours (area not ready, late answers, another trade in the way), state it as a dated fact and say that it affects your time. That one sentence is what preserves your right to an extension.

Send a look-ahead every week

Do not wait for something to go wrong. A short two-week look-ahead every Friday, with which crew is where, what you need released, and what deliveries are coming, makes you the subcontractor the superintendent does not have to chase. It also means that a schedule change arrives as an update to something they already read, not as a surprise.

Use the coordination meeting, and confirm it afterwards

Raise it in the weekly meeting, and check that it appears in the minutes. When the minutes arrive, read them. If something you said is missing or wrong, reply in writing that day. Uncorrected minutes become the record.

Keep your own log

For every job, keep a list of notices: date, what it said, who it went to, what came back. When a claim for delay damages or an extension is argued six months later, that list is the argument.

Tell your own people too

The crew, the office and your suppliers need the new date as much as the GC does. A delivery that arrives on the old date, to a site that is not ready, is a second problem made out of the first.

Where ConstructStream fits

In ConstructStream, when a visit moves on the schedule, the move is kept with its reason, so the history of every date is on the job. Emails about a job are sent from your own Gmail and filed on that job, where the notice and the reply can be found later. The crew sees the new dates on their phones without a separate call.