Project Deadline Estimates Are Always Wrong

Posted by David | Feb. 9, 2026, 9 a.m.

Industry

Construction

Pain Level

7 / 10

Affected People

My industry (hundreds+)

Job Role

Estimator

Frequency

Weekly

Status

Unsolved

Takes

Contact

estimates@builders.co.uk

Problem Description

When clients ask how long a project will take, we give an estimate based on past experience, but we're consistently off by 30-50%. This is because every project has unique complications we don't foresee, and we don't have good data on where time actually goes. Clients get frustrated with delays and our reputation suffers. Budget overruns are common.

Current Workaround

Adding a 40% buffer to all estimates, but this makes us less competitive and clients negotiate it away.

Takes:

Andrew Jan. 5, 2026, 4:09 p.m.

The frustrating part is that people think estimating is just 'being optimistic', but projects genuinely have hidden complexity. Then, when things run late, it turns into blame instead of a realistic conversation about unknowns and constraints.

Pain: 6/10 Weekly My industry (hundreds+)

David Dec. 26, 2025, 8:49 a.m.

The 30-50% miss rate is exactly what we see. Clients remember the date you gave them, not the reasons it moved. Internally it also makes planning impossible because every delay cascades into other jobs and everyone is firefighting.

Pain: 7/10 Weekly My industry (hundreds+)

Tim Dec. 12, 2025, 11:27 a.m.

We are always explaining why a date moved, and clients rarely care about the nuance. Even when the delay is understandable, it still feels like you are constantly disappointing people because the original estimate is what sticks in their mind.

Pain: 7/10 Weekly My industry (hundreds+)