Variation drafts
Approved by: your QS.
THE QUANTITY SURVEYOR AGENT · FOR RESIDENTIAL BUILDERS
The Quantity Surveyor Agent. Catch revisions before they cost you.
Compares revisions, validates quantities, surfaces cost movement, and drafts variation evidence. Your QS approves before anything ships.
Rev B → Rev C · 14 changes · £6,420 net
Rev B
Trench foundation to rear return- Standard plaster finish to bedroom
- Existing drainage retained
Rev C
- Raft foundation to rear return+£2,840 (substructure)
- Standard plaster finish to bedroom−£1,120 (finishes)
- New drainage run through side passage
14 changes · 3 require QS review
HOW IT WORKS
From revision drop to variation draft.
Inputs
Drawing revisions · Scopes · Structural calcs · Previous-job rates
BuildGuider
Project evidence layer
Outputs
Variation drafts · Cost-movement summaries · Quantity checks · Revision impact notes
WHAT IT PRODUCES
Outputs your QS will recognise.
Cost-movement summaries
Approved by: your QS.
Quantity checks against scope
Approved by: your QS.
Revision impact notes with evidence links
Approved by: your QS.
EVIDENCE
Your team approves before anything ships.
Every variation points at its source. Every line links back to the revision, the calc sheet, or the client note that produced it.
Every variation is reviewable. Open questions, confidence levels, and assumptions are visible on every artefact — your QS approves before anything ships.
Every decision leaves a trail. Edits, approvals, rejections, and reruns are timestamped and traceable.
See the audit trail in actionWHAT CHANGES
Catch revisions before they cost you.
Before
With BuildGuider
Rev C lands. No one knows what changed from Rev B.
A summary of every change between revisions, with cost implication notes.
Variations drafted manually, with no link back to source.
Variation drafts that point at the drawing revision and the client note that triggered them.
Quantities done in spreadsheet. Errors creep in.
Quantity checks against scope with confidence chips on every line.
Cost movement only visible at month-end.
Cost movement visible the moment a revision lands.
The rest of the team.
Six more specialists work from the same shared memory.
Estimator Agent
Turns drawings, notes, and invoices into reviewable scope. With evidence links.
Scopes & exclusions
Procurement Manager Agent
Learns from invoices, supplier catalogues, and price history.
Buying lists & suppliers
Site Manager Agent
Connects drawings, scope, notes, and decisions to site execution.
Task lists & issue logs
Project Assistant Agent
Keeps project admin moving and organises information into usable records.
Meeting notes & actions
Contract Manager Agent
Tracks scope changes, approvals, assumptions, and client decisions.
Change logs & evidence
Commercial Assistant Agent
Connects estimate, purchases, invoices, and margin visibility.
Cost-to-date & alerts
START SMALL
See it on your drawings.
Send us a real drawing pack from a real project. We'll show you what BuildGuider reads, what it flags, and what it produces — before any commercial conversation. Thirty minutes.
Start the pilot →