Demonstration project — all companies, people, figures and outcomes on this page are illustrative.
See how one rear extension is controlled from scope to handover
A fictional four-person residential contractor runs a 24-week rear extension entirely inside BuildOS. Every figure below comes from the demonstration workspace shipped with the product, so you can open the same project and click through it yourself.
- 24 weeks
- Demonstration programme
- £148.5k
- Demonstration contract value
- 5
- Demonstration variations
The demonstration figures
Illustrative scenario using realistic demonstration data. It is not a customer case study.
Approved variation value
£9,250
2 of 5 demo variations approved
Programme
24 weeks
4 days behind at week 15
Progress
62%
First fix & glazing
Demo forecast margin
10.0%
£157,750 revised value vs £141,900 forecast cost
Spend tracked against plan
Actual cost to date in the demonstration workspace is £82,150 against £82,400 planned — the remaining weeks show the forecast curve only.
Where the demo margin comes from
Recorded change and reduced rework, rather than squeezing subcontractors.
- Original contract sum£148,500
- Approved variations (2)£9,250
- Forecast cost at completion−£141,900
- Forecast margin£15,850
Explanatory commentary
In the demonstration, the bi-fold upgrade is raised on site with photographs and priced with its programme impact, and it sits with the demo client for a decision before any work starts.
Demo builder · Demo site manager · Demo client — illustrative personas, not customers.
How the twenty-four demonstration weeks run
Weeks 1–4
Scope agreed and versioned
Scope, programme and budget set up from a template. The demo client is invited to the portal and the scope version is locked once approved.
Weeks 5–12
Site evidence recorded daily
Diaries with labour, weather, deliveries and photographs, each linked to the phase and task it relates to.
Weeks 13–18
Change priced under ChangeLock™
A bi-fold upgrade (VO-004, £4,850, +3 days) is raised with photographs, priced with cost and programme impact, and sent to the demo client for a decision.
Weeks 19–24
Snagging and digital handover
Snags cleared with before-and-after evidence, then certificates, warranties and drawings packaged into the handover record.
Weeks 1–4
Scope agreed, versioned and locked
Weeks 5–12
Daily diaries and photographic evidence
Weeks 13–18
Variation raised, priced and approved
Weeks 19–24
Snagging cleared and digital handover
