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Remeasure After Revisions: 5 NRM2 Steps for UK QSs

October 10, 2026
Remeasure After Revisions: 5 NRM2 Steps for UK QSs

Remeasuring after revisions means updating a quantity takeoff or Bill of Quantities to reflect a revised drawing or digital model. The decisive question is whether the revision counts as a variation: if it does, remeasure from the revised drawing or model and assemble substantiation before claiming any change. Check NRM2 and RICS change control guidance first, as both set the rules this decision rests on.

TL;DR:

  • Check the contract first: remeasurement is routine under remeasurable or approximate Bills of Quantities, but firm Bills generally require an instructed variation.
  • Measure from revised drawings or digital models, reserving site checks for concealed work or genuine discrepancies and recording each check with dated notes and photographs.
  • Submit each change as a separate monthly pack containing the formal instruction, clause reference, marked drawings, linked measurements, rate calculations, and programme impact statement.
  • Agree change status and resolution timescales when each item is raised, and confirm provisional sum and prime cost conversion dates before final account.
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Table of Contents

When to remeasure: decision rules and contract context

Not every revised drawing demands a formal remeasurement. Standard forms draw a line between design development, which refines detail without altering what was agreed, and design change, which alters the employer's requirements or the quantity and quality of work. Whether a revision falls on one side or the other depends on the contract wording in use, and JCT, FIDIC and NEC clauses each define variations slightly differently, so the first check is always the contract itself.

Contract type matters too. Remeasurable and approximate Bills of Quantities are built on the expectation that quantities will be finalised later, so remeasurement on these contracts is routine rather than exceptional. Firm BQ contracts treat remeasurement as the result of an instructed variation instead.

A quick checklist settles most cases:

  • Has the employer's requirement changed, or only the level of design detail?
  • Has the quantity or quality of work actually altered?
  • Is there a formal instruction to vary, or only an informal drawing update?

If the answer to any of these is yes, treat the revision as a variation and move straight to remeasurement.

Step-by-step workflow to remeasure and update a Bill of Quantities

Once a revision is confirmed as a variation, the process follows a consistent sequence from drawing receipt through to an agreed cost.

  1. Log the revision in the drawing register, mark the superseded drawing accordingly and remove it from the active working folder so nobody measures from an outdated file.
  2. Identify affected BoQ items by cross-checking drawing numbers and revision suffixes against the existing NRM2 item references.
  3. Remeasure from the revised drawing or digital model, not from site, and keep a clear measurement trail: drawing extracts, scale references and measurement sheet references all need to point back to the source.
  4. Apply existing contract rates where the work matches priced items; where it does not, build a star rate with evidence of labour, materials and plant costs.
  5. Compile the substantiation pack, including the instruction to vary, the measurements, the rates and the programme impact, ready for monthly agreement.

RICS final account procedures guidance states that remeasurement should normally be taken from the drawing or model, with site remeasurement reserved for exceptional circumstances, such as concealed works that cannot be verified any other way or a genuine discrepancy between drawing and built form. When a site check is unavoidable, record it with photographs, dated notes and a clear reference back to the drawing it is testing.

Pro Tip: Keep a running log of which BoQ items are "under revision" as soon as a new drawing lands, rather than waiting for the full remeasurement to finish, so nothing slips through at final account stage.

Documentation and change-control checklist for audit-ready remeasurement

An audit-ready pack is what turns a remeasurement into an agreed change rather than a dispute. RICS change control and management guidance sets out the documents a quantity surveyor should hold for each change item before presenting it for agreement.

  • The formal instruction to vary, with the relevant contractual clause reference.
  • Marked-up drawings showing exactly what has changed, with revision numbers.
  • Measurements and their cross-references back to those drawings.
  • Rates and build-ups, plus any supporting quotations or invoices.
  • A statement of programme and preliminaries impact.

Agreeing the change status and timescale for each item at the point it is raised, rather than retrospectively, reduces the risk that changes are forgotten and helps account for knock-on programme effects before they become contentious.

Photographs and correspondence add weight where a change touches concealed or time-sensitive work. For monthly financial reporting, present each change as a discrete, labelled pack rather than folding it into the general valuation: the employer or contractor reviewing it should be able to trace instruction, measurement and cost in a few minutes without cross-referencing several documents.

Practical tips to reduce disputes when remeasuring after revisions

Most disputes over remeasured quantities trace back to poor labelling or untracked status, not disagreement over the figures themselves.

  • Agree the change status and a timescale for resolution on every item as soon as it is raised.
  • Use clear drawing labelling, with revision suffixes and a consistent "SS" marker for superseded drawings held in a separate folder.
  • Record assumptions and decisions in writing, and seek written confirmation from the employer or contractor where feasible.
  • Prefer drawing or model-based remeasurement and reserve site checks for genuinely verifiable exceptions.
  • Confirm the conversion dates for provisional sums and prime cost sums early, since these often cause late surprises at final account.

Pro Tip: A single shared drawing register, visible to the QS, architect and builder, removes most of the "which version are we pricing" arguments before they start.

Readers managing leasehold or multi-occupancy developments alongside these changes may also find it useful to understand how rebuild cost assessments interact with provisional sums for insurance-related works, since these figures often need updating alongside a remeasured BoQ.

Tools and workflows that support remeasurement, and how QuantiFlow fits the process

Several categories of tool support this workflow without replacing it. Drawing registers and version control keep the current-folder discipline intact. Digital takeoff software speeds up measurement from PDF or vector drawings. BIM and model-based tools support remeasurement directly from a digital model, as RICS guidance recommends. Document management tools help assemble the substantiation pack.

Four tool categories supporting remeasurement

QuantiFlow reads construction drawings and produces a draft Bill of Quantities for a quantity surveyor to review and sign off, and offers drawing revision control within an auditable workflow. Used this way, it can reduce the manual cross-referencing between drawing numbers and BoQ items described above, while the measurement decisions and sign-off remain with the surveyor.

For a closer look at the revision-register side of this, our drawing revision control guidance covers the auditable workflow in more depth.

Learn more: QuantiFlow for remeasurement workflows

We built QuantiFlow to take the manual cross-referencing out of post-revision remeasurement, not the professional judgement. Our platform reads construction drawings and produces a draft Bill of Quantities for you to review and sign off, with drawing revision control built into the workflow so superseded drawings never get mixed in with current ones.

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If you are updating takeoffs after every revised drawing by hand, this is a practical next step rather than a leap of faith:

  • Explore our plans, with current prices available on the QuantiFlow pricing page.
  • Request a demo to see how a draft BoQ from a revised drawing compares with your current working file.
  • Enterprise pricing is available on request for larger teams.

For readers measuring structural steel specifically, our structural steel takeoff walkthrough shows NRM2 measurement in practice on a single trade.

FAQ

How do I know if a drawing revision is a variation?

Check whether the employer's requirements have changed or only the design detail has developed, and whether a formal instruction to vary has been issued. RICS guidance on change control treats the presence of that instruction, along with a change in quantity or quality, as the deciding factors.

Should I remeasure from site or from the revised drawing?

Remeasure from the revised drawing or digital model in almost all cases. RICS final account procedures guidance states that site remeasurement should be reserved for exceptional circumstances, such as concealed work that cannot otherwise be verified.

What documents do I need before claiming a remeasured variation?

Assemble the formal instruction, the relevant contract clause, marked-up drawings, measurements with cross-references, rates and build-ups, and a programme impact statement. This pack, as set out in RICS change control guidance, is what supports monthly agreement and final account inclusion.

Does NRM2 tell me how to remeasure after a revision?

NRM2 sets the structure, format and tabulated rules for measuring and describing items in a Bill of Quantities, which governs how a remeasured item should be presented. It does not decide whether a revision is a variation; that depends on the contract itself, as covered in our NRM2 explained primer.

Can software produce a Bill of Quantities after a revision automatically?

Tools such as QuantiFlow can read a revised drawing and produce a draft Bill of Quantities for a quantity surveyor to review and sign off, which can reduce manual cross-referencing. The measurement decisions and final sign-off still rest with the surveyor.

This article is for general information only and is not professional, legal or commercial advice. Quantity surveying decisions should be taken by a qualified professional with reference to the specific project, drawings and contract in question. Content is produced with AI assistance and reviewed before publication. QuantiFlow Ltd accepts no liability for reliance on it.