Design change comparisons.
The hydraulic design has changed mid-project. You need to know exactly what changed, exactly what it costs and exactly how to document it. SNZ compares your two drawing sets and delivers a clear, priced breakdown.
Suitable for contract administration, variation claims, EOT submissions and commercial negotiations.
Design changes happen. The cost must be captured.
On any complex construction project, the hydraulic design will change. Sometimes once, sometimes many times. Every change has a cost, and every cost that is not captured, documented and claimed is money left behind.
A design change comparison is different from a variation assessment. A variation prices the additional scope from a single instruction. A design change comparison takes two complete drawing sets, the original and the revision, measures both in full, and identifies every difference between them.
The result is a document you can use for contract administration, variation claims, EOT submissions or commercial negotiations: a clear, priced record of exactly what the design change cost.
Every cost that is not captured, documented and claimed is money left behind.
Four steps. One clear answer.
Send both drawing sets
The original and the revision. PDF, DWG or Revit, plus any instruction or RFI that prompted the change.
any format
We measure both sets
Each drawing set measured in full using PlanSwift. Not sampled, not spot-checked, not estimated from the change notes.
in full
Differences identified
Every addition, every omission and every specification change set out line by line between the two designs.
line
Net cost delivered
The priced delta, itemised and traceable, in a document ready for claim or contract administration.
submit
A record that stands up.
Full drawing set comparison.
Both sets measured completely, so nothing is missed between them. A sampled comparison finds only the changes someone already knew about.
Net cost clearly identified.
Additions and omissions both measured, so the figure is the true delta rather than only the extras.
Defensible documentation.
Every figure itemised and traceable back to the drawings, so it holds up in contract administration or negotiation.
What contractors say.
Verified Google reviews. 5.0 from 69 reviews.
We’ve been incredibly impressed with the responsiveness and professionalism of SNZ. Quick to respond, thorough in their work, and consistently reliable. Their attention to detail has made a real difference to our workflow. We see them as a valuable long-term partner.
Worth every penny. SNZ estimated a large commercial hydraulic, civil and fire package in SA on a tight timeline. Within 24 hours they had started on our quote. Their detailed estimate provided everything we needed to fill in the tender documents with ease.
Shoaib and the team went over and above to deliver in a tight timeframe. Everything was detailed and communication was 10/10. The breakdown was very thorough and transparent covering all aspects of the job. Will definitely be using SNZ on future projects.
Common questions.
How is this different from a variation assessment?
A variation assessment prices the additional scope from a single instruction. A design change comparison takes two complete drawing sets, measures both in full, and identifies every difference between them, additions and omissions alike.
What do you need to start?
Both drawing sets, the original and the revision, plus any instruction or RFI that prompted the change. We come back within a few hours with a turnaround time and fee.
Do you measure both drawing sets in full?
Yes. Both sets are measured completely in PlanSwift rather than sampled. A sampled comparison only finds the changes someone already knew about.
Can I use the document in a claim?
Yes. It is itemised and traceable back to the drawings, and is designed for contract administration, variation claims, EOT submissions and commercial negotiations.
Do you capture omissions as well as additions?
Yes. Scope removed is measured alongside scope added, so the figure you receive is the true net cost rather than only the extras.
Do I need to have used SNZ for the original estimate?
No. Send us both drawing sets and we will compare them on their own merits.
Explore more.
Design has changed on your project?
Send us both drawing sets and we will come back within a few hours with a turnaround time and fee. Fast, clear and defensible, every time.
Request an estimate