Short-Interval Planning in Construction: The Complete UK Guide

What Is Short-Interval Planning?

Short-interval planning is the discipline of planning site work in short windows, usually one to three weeks, at a level of detail the master programme cannot reach. It goes by several names: look-ahead planning, short-range planning, SIP, or simply the weekly work plan. The idea is the same in each case. Instead of asking “is the project on programme?”, you ask “what exactly is happening on this site next week, and is every one of those tasks actually ready to start?”

A short-interval plan lists the tasks for the window, who is doing each one, and what each task needs before it can begin. It is reviewed weekly and adjusted daily. Done well, it is the difference between trades arriving to work that is ready for them and trades standing around while someone rings the merchant.

The practice comes out of lean construction and the Last Planner System, but you do not need the theory to benefit from it. Every good site manager already does a version of this in their head. Short-interval planning just makes it visible, shared and checkable.

Why the Master Programme Is Not Enough

Every project has a master programme, and almost no task on site starts because of it. The programme lives in the office, drawn months ago, at a level of detail that says “first fix, plots 3 to 6, weeks 14 to 17”. It cannot tell you that plot 4’s revised drawings have not landed, that the spark is on another job until Thursday, or that the steel lintels never got ordered.

That gap between the programme and the day’s reality is where most site delays are born. UK construction industry studies consistently find that the majority of projects run late, and the causes are rarely dramatic. They are small, avoidable readiness failures: the right people arriving to work that is not ready, materials spotted missing at the last minute, and instructions that never reached the person doing the job.

Short-interval planning closes the gap by forcing one question on every task in the window: is this task genuinely ready, and if not, what is missing and who is getting it?

How to Run Short-Interval Planning

The process is simple enough to start this Monday. What matters is doing it every week, with the people who actually do the work.

1. Pick the window. Two weeks suits most UK sites. One week is too reactive; four weeks drifts back into programme territory.
2. List the tasks. Break the programme’s current section into tasks small enough to finish in days, not weeks, and assign each one to a named person or gang.
3. Run the constraint check. For every task, confirm the four things it needs: current drawings, materials on site or ordered with a delivery date, the right labour booked, and access to the workface. A task missing any of these is not ready, and putting it in the plan anyway is how programmes turn into fiction.
4. Make the plan visible to everyone. The plan only works if the trades doing the work can see it, not just the office. This is where most paper and spreadsheet systems quietly fail.
5. Check daily, review weekly. A two-minute daily look at what finished and what slipped, then a weekly session to roll the window forward and learn from what missed. If a task keeps slipping, the constraint check was wrong, and the plan gets more honest every week you run it.

The Constraint Check

The constraint check is the heart of short-interval planning, so it deserves its own section. A task is only ready when all four constraints are clear:

• Information. The current drawing revision and specification, in the hands of the person doing the work. Not in an email. Not in a WhatsApp group from three weeks ago.
• Materials. On site, or ordered with a confirmed delivery date that lands before the task starts. Material requests raised the moment a gap is spotted, not the morning the gang arrives.
• Labour. The right trade, booked and confirmed, with no clash against another site or another task.
• Access. The workface physically available: preceding work complete, area safe, and nothing blocking the job.

Sites that run this check honestly find the same thing: most “delays” were visible a week early. The delay was never the surprise; the surprise was that nobody was looking.

Why UK Sites Struggle With It

Short-interval planning is not a new idea, and most site managers would agree with every word above. The struggle is practical, and it comes down to three things.

The plan lives in the wrong place. A whiteboard in the cabin or a spreadsheet in the office cannot reach the people doing the work. The moment the plan needs a phone call to check, it stops being used.

The information feeding it is scattered. The constraint check needs drawings, material status, labour availability and site progress in one view. On most sites those live in four different places: email, the merchant’s phone line, the subbie’s word and the site manager’s memory.

Subcontractor coordination. UK sites run on subcontractors, and a look-ahead plan that the subbies cannot see or update is guesswork. The plan has to be shared to be true.

None of these are discipline problems. They are information problems, which is why the tooling matters more here than almost anywhere else in construction management.

Tools for Short-Interval Planning

Whiteboard and paper. Free, visible in the cabin, and genuinely effective for the weekly session. Falls down the moment anyone leaves the room: no history, no sharing, no link to drawings or materials.

Excel. The default on most UK sites. Fine for listing tasks, but it cannot check constraints for you, nobody on the tools ever opens it, and version confusion means the office and the site are usually looking at different weeks.

Enterprise planning tools. Powerful look-ahead modules exist in high-end systems, but they are priced and designed for tier-one contractors with planners on staff. For an SME running six sites, they are a sledgehammer that nobody on site will ever log into.

Site management apps. The practical middle ground for UK SMEs: the look-ahead plan, the drawings, the material requests and the daily progress in one app that the trades actually carry. The test for any tool is simple: can the person doing the task see what they need on their phone, and does the plan update itself when the work happens?

How BuildersAI Handles It

BuildersAI was built around the readiness problem. The pieces of short-interval planning that normally live in four places live in one app, on every phone:

• Gantt charts, milestones and look-ahead views for the planning window, visible to the whole team rather than just the office.
• Task dependencies, so a task unlocks when the work before it finishes, and nobody gets sent to a workface that is not ready.
• Tasks with the drawing and photos attached. The information constraint is cleared by default: whoever picks up the task has the current revision in the same place.
• Material requests raised on site, seen instantly by whoever buys, so the materials constraint is visible days early instead of the morning of.
• Live progress and geofenced check-in, so the daily check happens from a phone rather than a walk-round with a notebook.

It has a 14-day free trial with every feature included, works offline, and teams are typically set up within a day.

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