A construction schedule lays out the work: what gets built, in what order, how long each activity takes and what depends on what. Building it is the easy half. Keeping it tied to what actually happens in the field is where most projects lose it.

A few weeks into the job, the file says one thing and the site says another. Not because the schedule was badly built, but because keeping it current takes more time than anyone has.

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What a construction schedule should include

A construction schedule is the ordered set of activities needed to deliver a project within a given period. To be useful in the field, it should carry:

• activities and activity groups
• start and finish dates, and durations
• predecessors and the critical path
• a responsible party per work front
• contract milestones
• the project work calendar
• planned progress against actual progress

With that in place, anyone on the team can answer what should be running, what is finished and what is slipping. The condition is that the schedule stays current, and that depends less on whoever built it than on whoever reports from the field. Worth reading first: what it takes for a field team to actually use a control platform.

This is not a small gap. In conversations with 224 general contractors, developers and design firms across Mexico and Latin America between April and September 2026, 33% raised the distance between physical progress and the baseline on their own, and 41% raised how hard it is to report progress to management.

Base: 224 companies, April to September 2026. Each company could raise more than one topic. This is not a representative industry survey: these were teams already looking to fix something.

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Where spreadsheets fall short

A spreadsheet is fine for building the schedule. The limits show up in maintaining it, once there are several work fronts and several people entering data.

The file going around is not always the current one. It gets emailed, downloaded, edited and sent back. As more people touch it, three versions with the same file name end up in circulation, and the argument stops being about the job and starts being about which file is right. It is the same problem that shows up when you centralize project communication and documents.

Progress gets entered twice. The site engineer reports progress in the daily report, then someone re-enters the same percentage into the schedule. Because it is duplicate work, it gets postponed. And once it is postponed, the schedule stops matching the job.

The S-curve gets rebuilt for every meeting. Comparing planned against actual means cross-referencing the schedule with the reports at every cut-off. In practice the curve gets refreshed when there is a meeting, not when the job changes: by the time it shows the variance, the variance already happened.

Progress has nothing behind it. A line item reads 80% and there is no way to tell who reported it, when, or on what evidence. Same with dates: one slips and the sheet does not record who moved it. When a delay or a pay application is disputed, it comes down to one person’s word against another’s. It is the same missing backup that makes it hard to give a developer the information they need from the contractor running the job.

None of this means the spreadsheet was badly built. It means it is doing a job it was never designed for: being the single source for a number that changes every day and is entered by several different people.

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How the construction schedule works in Buildpeer

MS Project stays the source of truth. Buildpeer does not plan the job for you: it connects the schedule to the information the site already produces.

Import what you already have

The MS Project file comes in with its groups, activities, durations, predecessors and milestones, with no templates and no manual entry. If the team works in Excel, the assistant reads the sheets, columns and hierarchy, proposes a configuration and shows a full preview before you confirm. And if the job is already under way, accrued progress comes in as an opening balance, so the project starts with its history instead of at zero.

Progress comes from the field report, not a second entry

The site engineer links each section of the report to a line item in the schedule. When the report is published, those line items advance, with the report photos and notes attached as evidence. The report is filled as a draft day by day and published once a week, so official progress only counts once it is published.

Every movement carries an author, a date and the report it came from, and corrections are written on top of the history instead of erasing it. That is what matters when a pay application is disputed or an audit comes around. It follows the same logic as digital tools for effective remote collaboration in construction.

An S-curve and a Gantt chart that do not get rebuilt

The curve compares planned against actual progress week by week and refreshes with every published report. The Gantt chart shows activities against the project calendar, with the "Today" line marked and each line item’s progress on its own bar. Both can be read as a percentage or by value, and each project sets its own currency.

Milestones and the real work calendar

Milestones such as a handover, a utility connection or a start date are marked as met or not met from the report itself, with the evidence behind them. The work calendar is set per project, including official Mexican holidays in one click, so planned progress follows the real calendar of that job rather than a straight run of days.

Two things the field notices: when entering progress, the site engineer sees how the line item total will land and how much has been spent against budget, with a warning if either goes over; and the module always shows the date of the last reported progress, so nobody confuses "no delay" with "no recent data". All of it can be captured from a phone, the same way the team works when the site keeps running without a connection.

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What changes with Buildpeer