Consultants' bills of quantities: sources, scope and coordination
Consultants' bills of quantities should reach bidders as a tender package they can navigate. Combining files is only part of the work. The package also needs to identify who prepared each bill, which revision was supplied and how its scope relates to the building works. A useful consolidation keeps the consultants' content intact and makes unresolved questions visible.
Consultants' bills of quantities start with a source register
Before combining the documents, list the consultant, discipline, filename, date received and stated revision for each submission. Record whether it includes a bill of quantities, specification, drawings or only part of the expected material. A file being present in a project folder does not establish that it is the version intended for tender.
Where possible, obtain the consultant's original file or software export together with a viewable or printed version for comparison. Extracting a bill from PDF requires checks against its original pages. A description split across lines, a unit or a footnote can otherwise end up attached to the wrong item. Keep the source separately from the working copy so that a question can be traced back to it.
Agree which disciplines are included in the consolidation and who will obtain missing documents. The checklist for BOQ preparation helps define that scope before work begins. A discipline should not be described as included simply because its name appears on a drawing when its bill has not been supplied.
What must survive a change of format
In my work, consultants' bills of quantities retain their descriptions, units, quantities, item order and notes. Subheadings and markings that exclude an item from a total are also part of the information to preserve. If the combined package needs another numbering system, the consultant's original item identifier and discipline remain traceable alongside it.
Two rows with similar headings are not automatically duplicates. They may cover different locations, different work or alternatives. An unclear item becomes a question to the consultant. A substantive change is recorded through a revised file or written instruction, with its source and date, rather than being silently introduced during formatting.
A blank quantity, a zero quantity and an item marked as excluded from the total mean different things. Preserve the source meaning and show missing information explicitly. Before delivery, check which rows feed the subtotals and the overall total.
Check where services meet the building works
The consolidation review focuses on consistency and the scope boundaries agreed for the assignment. Floors, areas and revisions can be compared where those details are provided, but not every bill contains the same information. A difference is a reason to investigate: it may reflect a different scope, stage or revision rather than an error.
The following table suggests coordination questions. These are general examples of interfaces, not findings from a particular project or an allocation of contractual duties.
| Interface | Information to look for | Question to resolve |
|---|---|---|
| Roof equipment | Supplied equipment schedules, bases and fixing details | Which bill includes the bases and where their dimensions come from |
| Service penetrations | Openings, sleeves and sealing details | Whether the items describe the same scope or complementary work |
| Shafts and service rooms | Walls, finishes and access to equipment | Which parts sit in the building works bill and which in the consultant's bill |
| Tender alternatives | Base and alternative items and their total settings | Which rows are for comparison and which belong in the base total |
An absent item does not prove that the work is unnecessary. Check the relevant drawings, specifications and agreed scope before framing the question. The guide to reading a specification before measurement explains how a work description connects to its source documents.
Keep questions open until their effect is checked
Give each question a stable identifier. Record the discipline, source file, revision, item and location, followed by a brief description of the issue and the person it was referred to. Useful states include awaiting a response, clarification received and revised file received. Receiving an answer does not finish the task until its effect on the package has been checked.
When a consultant supplies a revised bill, keep the previous version in the history and compare added, removed and changed items. An unchanged total is not enough to establish that nothing changed. A description, unit or work breakdown can change without an obvious movement in the overall figure. Deliver unresolved questions as a visible list with the relevant material.
Agree the scope and delivery before consolidation
Consolidating consultants' bills of quantities is a separate service from preparing the building works bill. The written quote defines the disciplines and files included, any format conversion, the checks to be performed and the treatment of further revisions. A consistency review is not a fresh measurement of every consultant's design; that would require a separately defined scope.
The agreed delivery may include a combined document or workbook, a source register and an outstanding questions list. Formats and scope are settled in advance, and not every assignment includes editing a complete tender package. See the service and fee information; the binding fee for a project is set out in its written quote.
A quantity surveyor may be an engineer or a registered building technician, like Yaakov Avital. I am Yaakov Avital, a quantity surveyor and registered building technician. I measure details as a contractor would need to build them, and when consolidating material I also examine the interfaces between disciplines. To discuss the scope, contact me through the quantity surveyor page with the consultant list and a description of the material already available.
Frequently asked questions
Can consolidation begin before every consultant has submitted material?
A partial package can be defined with an explicit record of what has arrived and what is missing. It should not be presented as complete; agree who will obtain the outstanding material and how the delivery will be updated.
Can a consultant's wording or quantity be corrected during consolidation?
A substantive question goes back to the consultant. Keep the original content until a correction or written instruction is received, and record the source of the change and the revision in which it was incorporated.
How do you check whether an item has been counted twice?
Compare its description, location, unit and scope boundaries, not just its heading. If a doubt remains, raise a question rather than deleting the item without clarification, and record the decision before changing the total.
Have a project? Tell me briefly what the project is and what already exists. When the project is a good fit, I usually reply with focused questions and a written quote.
Contact me for a quote* Created with AI for marketing, for illustration only. Not reviewed by Yaakov Avital and not professional advice. Every project must be checked on its own by a professional quantity surveyor and an engineer.