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Avoid BoQ Queries: 5 Step NRM2 Door Takeoff for UK Quantity Surveyors

October 7, 2026
Avoid BoQ Queries: 5 Step NRM2 Door Takeoff for UK Quantity Surveyors

A door schedule takeoff produces auditable counts by door type and a draft Bill of Quantities row ready for a quantity surveyor's review, structured against NRM 2 Work Section 24. The next action is always the same: cross-check the schedule against BS 8214:2026 for fire doors and Approved Document M for accessible openings, then flag contractor-designed items for later verification.

TL;DR:

  • Cross-check door counts against BS 8214:2026 standards, ensuring fire doors are recorded as complete systems including leaf, frame, and ironmongery.
  • Measure clear opening widths directly to verify compliance with Approved Document M, rather than relying solely on nominal leaf sizes.
  • Reconcile plan tags with schedule entries carefully, recording assumptions and flagging discrepancies for review to prevent errors.
  • Use a systematic QA routine to verify total counts, fire-rated door completeness, and documentation accuracy before signing off on the takeoff.
  • Choose the takeoff method based on project size and complexity, with AI tools suited for large tenders but always requiring manual verification against source drawings.
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Table of Contents

Step-by-step workflow for a door schedule takeoff

Working methodically through the drawing set before counting anything saves rework at tender stage. Each step builds a defensible paper trail, which matters more than speed when a figure gets queried.

  1. Confirm the sheet index, revision status and legend before counting a single door; a superseded drawing invalidates every count taken from it.
  2. Identify each door graphic, its tag, swing direction and ironmongery notes from both plan and elevation views.
  3. Measure clear opening widths directly, record the nominal leaf size separately, and note which document controls each figure when they conflict.
  4. Aggregate counts by door type, size and operation, then draft schedule rows with the originating sheet reference attached to each.
  5. Mark any door as contractor-designed or provisional where the specification is incomplete, rather than guessing at a performance class.

Our guidance on measuring PDF drawings for NRM2 takeoffs covers the scale-setting groundwork that step one depends on, and the same logic applies whether the drawing covers doors, windows or structural elements.

Pro Tip: Keep a running tally sheet with sheet numbers in a separate column from the count itself; it turns a two-minute query into a thirty-second answer.

Which standards and regulations affect a door takeoff

Several UK references shape what a takeoff must capture, not just how many doors exist on a plan.

  • NRM 2 places doors, shutters and hatches under Work Section 24 and sets out the tabulated measurement rules for describing each doorset in a Bill of Quantities, treating the door schedule itself as authoritative drawing information.
  • BS 8214:2026 frames fire doors as coordinated complete systems rather than a leaf, frame and hardware set measured separately, which changes what a takeoff needs to record for each fire doorset.
  • Approved Document M sets minimum clear opening widths for accessible entrances, so the clear opening, not the nominal leaf size, is the figure to check against compliance.
  • Approved Document B governs fire resistance periods for doors forming part of escape routes and protected stair enclosures.

The 2026 revision of BS 8214 expands system-level specification guidance to cover timber, metal, aluminium and composite doors alike, and BSI's own commentary notes a shift away from treating leaf, frame and hardware as separate assumptions. Compliance notes belong in the BoQ preamble, where contractor responsibilities for performance criteria are set out clearly rather than buried in an individual line item.

Cross-referencing drawings, schedules and specifications

Reconciling the plan, the door schedule and the written specification is where most takeoff errors surface, usually as a mismatch between a graphic tag and a schedule entry.

  • Walk the plan door by door, matching each tag to its schedule row and its elevation detail before moving to the next sheet.
  • When a plan size and a schedule size disagree, record which document you treated as controlling and why.
  • Write a short assumption note for anything inferred rather than stated, and flag it for a tender query.
  • Record contractor-designed doorsets and provisional sums separately from measured counts, following NRM 2's guidance on identifying contractor-designed work clearly in the BoQ.
  • Annotate every measurement choice with a sheet number and the name of whoever authorised it.

Pro Tip: A one-line assumption log next to the takeoff, rather than buried in e-mail threads, is what makes a query answerable six weeks later.

An audit-ready QA routine for door schedule takeoffs

A short, timed check before sign-off catches most transcription errors without re-measuring the whole drawing set.

  1. Spend the first few minutes confirming the schedule total matches the plan count, door by door.
  2. Spot-check three or four openings against clear widths required by Approved Document M.
  3. Scan fire-rated doorsets for complete ironmongery and performance evidence rather than a leaf count alone.
  4. Review the assumption log for anything marked provisional or contractor-designed.
  5. Confirm the audit trail records sheet references, assumed dimensions and any queries raised.

This mirrors the structure behind our own eight-step audit-ready takeoff workflow, and the same short QA routine we describe for window schedule takeoffs adapts directly to doors. An AI-assisted draft can save time generating the first pass, but every counted item still needs a sheet reference a reviewer can trace back to the source drawing, and professional judgement still decides what the figure means.

Pro Tip: Log queries as you raise them, not after the tender closes; a query without a timestamp is hard to defend later.

Illustrated timestamped door takeoff audit trail

Choosing a takeoff method: manual, BIM, photo or AI-assisted

The right method depends on project size and how much of the audit trail needs to survive scrutiny later.

  • Manual measurement on printed or PDF drawings suits small jobs with a handful of door types and low revision risk.
  • BIM-extracted schedules suit Revit-based projects where the model already carries door data, though the export still needs a manual spot check against the architectural schedule.
  • Mobile photo capture suits site verification of existing doors, useful for refurbishment work where drawings are incomplete.
  • AI-assisted extraction from PDF drawings suits large, multi-sheet tenders, but the output remains a draft until a surveyor checks a sample against the source sheets.

Whichever method produces the first pass, the auditable output is the same: a count traceable to a sheet reference, not just a number in a spreadsheet.

Common errors and the checks that catch them

A handful of mistakes account for most door takeoff rework, and each has a specific check that catches it before tender.

  • Confusing clear opening with nominal leaf size inflates or deflates accessibility compliance; check the clear width directly against Approved Document M.
  • Missing ironmongery on a schedule row leaves a fire doorset incomplete; cross-check the specification against the schedule for closers, seals and signage.
  • Mis-tagged doorsets between plan and schedule cause duplicate or missing counts; reconcile tag by tag rather than trusting a total.
  • Fire-door assembly omissions, such as a frame or threshold left off the count, break the system-level approach BS 8214:2026 expects.

Pro Tip: Treat any discrepancy you cannot resolve from the drawing set as a design query, not a guess; log it and move on rather than holding up the whole schedule.

An audit-ready draft for your next door schedule

We have developed a tool to read construction drawings and produce a draft Bill of Quantities for a quantity surveyor to review and sign off. It remains in development, and every output is a starting point for professional judgement, not a replacement for it.

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FAQ

What is a door schedule takeoff?

A door schedule takeoff is the process of counting and recording every door on a set of architectural drawings by type, size and operation, then structuring those counts into a draft Bill of Quantities entry. It follows NRM 2 Work Section 24 for how each doorset should be described and measured.

How do I calculate a material takeoff for doors?

You calculate a door material takeoff by counting doors from the plan, matching each to its schedule tag and elevation detail, and recording leaf size, frame type and ironmongery for each doorset. The count then feeds into a priced Bill of Quantities row once a surveyor confirms the measurements against the specification.

What is the difference between quantity takeoff and material takeoff?

A quantity takeoff measures and counts items from drawings, such as the number and size of doors, without pricing them. A material takeoff typically extends that count into the specific materials and components needed to supply and install each item, which then feeds pricing in the Bill of Quantities.

What is the best AI construction takeoff software?

There is no single verified leader, since published, independent comparisons of AI takeoff tools for UK construction are not publicly available. Evaluate any tool on whether its output is traceable to source drawings and compatible with NRM2 structuring, since that is what a surveyor needs to sign off a draft.

How do fire door rules affect a door schedule takeoff?

BS 8214:2026 treats fire doors as coordinated complete systems, so a takeoff needs to record the leaf, frame, ironmongery and performance evidence together rather than as separate items. Omitting any one component from the schedule risks an incomplete fire doorset at installation.

Sources

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.